id stringlengths 4 7 | question stringlengths 38 1.63k | answer stringlengths 1 263 | answer_type stringclasses 10
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848622 | A uniform 4.8 T magnetic field points north. If an electron moves vertically downward (towards the ground) with a speed of {eq}1.3\times 10^7\ m/s
{/eq} through this field. What is the magnitude of force acting on it. ?
Answer in units of N | 9.98e-12 N | Float | Physics | Senior High School |
1862151 | Three deer, A, B, and C, are grazing in a field. Deer B is located 61 m from dear A at an angle of 53 degrees north of west. Deer C is located 75 degrees north of east relative to dear A. The distance between deer B and C is 93 m. What is the distance between deer A and C? (Hint: Consider the law of cosines.) | 117 m | Integer | Physics | Senior High School |
366560 | Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s but collides head-on with a padded goalpost and experiences a backward force of {eq}1.76 \times 10^4
{/eq} N for {eq}5.50 \times 10^{-2}
{/eq} s. | -0.8 m/s | Float | Physics | Senior High School |
2004578 | In a Young's double-slit experiment {eq}\lambda
{/eq} = 500 nm, d = 1.0 mm and D = 1.0 m. Find the minimum distance from the central maximum for which the intensity is half of the maximum intensity. | 1.25e-4 m | Float | Physics | Senior High School |
1528308 | A student librarian picks up a 2.2 kg book from the floor to a height of 1.10 m. He carries the book 7.8 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book? | 7.546 J | Float | Physics | Senior High School |
920344 | An aluminum rod is under the tensile load of F. It has a critical resolved shear stress of 150 psi. The rod fails by slip over a plane at a 60 {eq}^o{/eq} angle with the cross sectional area of the rod and along a 45 {eq}^o{/eq} direction to the axis of the rod. The cross sectional area of the rod is one square inch.
... | 424.264 lb | Float | Physics | University |
1353687 | One certain commercial mass spectrometer is used to separate uranium ions of mass 3.92 x 10{eq}^{-25}
{/eq} kg and charge 3.20 x 10{eq}^{-19}
{/eq} C from related species. The ions are accelerated through a potential difference of 85.9 kV and then pass into a uniform magnetic field, where they are bent in a path of r... | 1.21e5 J | Float | Physics | University |
349503 | When a force of {eq}500\ \mathrm{N}
{/eq} pushes on a {eq}25\ \mathrm{kg}
{/eq} box, the acceleration of the box up the incline is {eq}0.75\ \mathrm{m/s^2}
{/eq}. If the inclined plane makes an angle of {eq}40
{/eq} degrees relative to the horizontal level, what is the coefficient of kinetic friction? | 1.72 | Float | Physics | Senior High School |
1734961 | Point charge {eq}\rm 3.0 \ \mu C
{/eq} is located at x = 0, y = 0.30 m. Another point charge {eq}\rm -3.0 \ \mu C
{/eq} is located at x = 0 y = -0.30 m. What are the magnitude and direction of the total electric force that these charges exert on a third point charge {eq}\rm 5.0 \ \mu C
{/eq} at x = 0.40 m, y = 0? | 0.647 N j | Expression | Physics | University |
1321626 | What is the initial angle of projection of a projectile for which the range and the maximum height are equal? | 76 degrees | Integer | Physics | Senior High School |
2097626 | A 5.65 kg object is released from rest while fully submerged in a liquid. The liquid displaced by the submerged object has a mass of 3.15 kg. How far and in what direction does the object move in 0.250 s, assuming that it moves freely and that the drag force on it from the liquid is negligible? | 0.136 m | Float | Physics | Senior High School |
926105 | Calculate the work done by the force vector {eq}\overrightarrow{F}\left( x,y \right)=-yi+xj {/eq} from {eq}(3,9) {/eq} to {eq}(0,0) {/eq}, including the part of {eq}C:y={{x}^{2}} {/eq} parabola between {eq}(0,0) {/eq} and {eq}(3,9) {/eq}. | 9 | Integer | Physics | University |
206550 | A point charge Q moves on the x-axis in the positive direction with a speed of 280 m/s. A point P is on the y-axis at y=+70mm. The magnetic field produced at the point P, as the charge moves through the origin, is equal to -0.30 {eq}\mu
{/eq}T k. What is the charge Q? ({eq}\mu_0 = 4\pi*10^{-7}T.m/A
{/eq}) | -52.5 μC | Float | Physics | University |
1666577 | A proton is at the origin and an electron is at the point x = 0.51 nm, y = 0.20 nm. Find the electric force on the proton. | - 7.677e-10 N | Float | Physics | Senior High School |
1812372 | A person pulls a 40.0 kg crate with a rope across the floor at a constant velocity. They pull at an angle so that the horizontal component of tension is 100 N to the right and the vertical component of tension is 80 N up. What is the coefficient of kinetic friction, {eq}\mu _k {/eq}?
Hint: Set this up as a typical New... | 0.32 | Float | Physics | Senior High School |
1780444 | A proton, traveling with a velocity of 6.8*10{eq}^6
{/eq} m/s due east, experiences a magnetic force that has a maximum magnitude of 8.6*10{eq}^{-14}
{/eq} N and direction of due south. What are the magnitude and direction of the magnetic field causing the force? If the field is up, then enter a number greater than z... | -0.0789 T | Float | Physics | Senior High School |
677724 | A system gains {eq}\displaystyle
3330 J
{/eq} of heat at a constant pressure of {eq}\displaystyle
1.46 \times 10^5 Pa,
{/eq} and its internal energy increases by {eq}\displaystyle
4190 J.
{/eq} What is the change in the volume of the system, and is it an increase or a decrease?
{eq}\displaystyle
\Delta V = \bo... | -5.89e-3 m^3. The change in the volume of the system decreases | Float | Physics | Senior High School |
1139450 | In a certain system, the water used for storage is initially at 70 degree Celsius and it is required to provide an average of 7.5 kW to keep the house at an average of 18 degree Celsius for 3 days, how much water is needed? | 8943.68 kg | Float | Physics | University |
1122809 | A car is parked near a cliff overlooking the ocean on an incline that makes an angle of 21.7{eq}^{\circ}
{/eq} with the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline and has a velocity 20 m/s when it reaches the edge of the ... | 25.7m | Float | Physics | Senior High School |
2103132 | A circular saw blade with a radius of 0.125 m starts from rest and turns in a vertical plane with a constant angular acceleration of {eq}2.00\ rev/s ^2
{/eq}. After the blade has turned through 155 rev, a small piece of the blade breaks loose from the top of the blade. After the piece breaks loose, it travels with a ... | 7.85 m | Float | Physics | University |
2069098 | You rub two {eq}4 mg
{/eq} balloons with a wool sweater. The balloons hang from {eq}0.5 m
{/eq} long, very light strings. When you attach the strings together at the top, the balloons repel from each other with each string making an angle of {eq}37^\circ
{/eq} with the vertical. If you assume each balloon acquired t... | 34.5 nC | Float | Physics | Senior High School |
1599954 | 1. A cue ball traveling at 0.60 m/s hits the stationary 8-ball, which moves off with a speed of 0.20 m/s at an angle of {eq}31^{\circ}
{/eq}relative to the cue ball's initial direction. Assuming that the balls have equal masses and the collision is inelastic, what will be the speed of the cue ball? | 0.44 m/s | Float | Physics | Senior High School |
1852830 | A 3.8 kg fish swimming 1.3 m per s swallows an absent minded 1.4 kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. What is the velocity {eq}v
{/eq} of the smaller fish before lunch? | -3.53 m/s | Float | Physics | Senior High School |
1598227 | Assume the driver has a mass of {eq}70.6 \ kg
{/eq}. What horizontal force does the seat exert on the driver? | 70.6a Newtons | Expression | Physics | Senior High School |
1518329 | A particle is moving along the curve {eq}y = \sqrt x
{/eq}. As the particle passes through the point (16,4), its x-coordinate increases at a rate of 5 cm per second. How fast is the distance from the particle to the origin changing at this instant? | 5.0023 cm/s | Float | Physics | University |
1909231 | The electric field between two charged parallel plates is {eq}3500 \ N / C
{/eq}. A {eq}0.000012 \ kg
{/eq} pith ball carries a charge of {eq}6 \times 10^{-11} \ C
{/eq}. The Ball is held at the midpoint of the plates. If released, how much kinetic energy does the ball gain traveling {eq}2 \ cm
{/eq} towards th... | 4.4e-9 J | Float | Physics | Senior High School |
1545223 | Given: A bug is on the rim of a 9.0 in. diameter disk, which moves from rest to an angular speed of 80 rev/min in 4.0 s.
One second after the bug starts from rest, what is its tangential acceleration? | 0.2393875 m/s^2 | Float | Physics | Senior High School |
1049821 | A balloon is rising at a rate of 33 meters per second from a point on the ground 54 meters from an observer. Find the rate of change of the angle of elevation from the observer to the balloon when the balloon is 20 meters above the ground. If necessary, round your answer to at least three decimal places. Give answer in... | 0.54 rad/s | Float | Physics | Senior High School |
977309 | A satellite is placed in orbit 100 km above the surface of the earth (radius = 6370 km, mass = {eq}5.98 \times 10^{24}
{/eq} kg). What is the value of the acceleration of gravity at that altitude as a percentage of the acceleration at the surface of the earth? | 96.9% | Percentage | Physics | Senior High School |
808920 | What is the acceleration, in m/s{eq}^2{/eq} due to gravity of the sun at the distance of 2.0 {eq}\times{/eq} 1011 m?
The asteroid revolves around the sun in 394 earth days. | 3.30 * 10^-3 m/s^2 | Float | Physics | Senior High School |
156996 | A 35.41-g sample of Cu(s) at 96.73 degrees C was added to a constant-pressure calorimeter containing 148.3 g of H{eq}_2
{/eq}O(l) at 25.20 degrees C. The final temperature of the system was 26.66 degrees C. Assuming no heat loss to the surroundings, what is the calorimeter constant? | 33.8 J/°C | Float | Physics | University |
1315999 | Find the power of an engine in kilowatts which pulls a train of mass 600 tonnes up an incline of 1 in 100 at the rate of 60 km per hour.
The weight of the engine is 200 tonnes and the resistance due to friction is 50 newtons per tonne. | 1974 kW | Integer | Physics | Senior High School |
318793 | Two point charges {eq}\rm Q_1 = 100 \ \mu C
{/eq} and {eq}\rm Q_2 = 230 \ \mu C
{/eq} are initially very far apart. They are then brought together, with a final separation of 0.1 m. How much work does it take to bring them together? | 2070 J | Integer | Physics | Senior High School |
1138566 | A tennis ball is struck and departs from the racket horizontally with a speed of {eq}28.6 \ m/s {/eq}. The ball hits the court at a horizontal distance of {eq}20.1 \ m {/eq} from the racket. How far above the court is the tennis ball when it leaves the racket? | 2.4 m | Float | Physics | Senior High School |
783982 | A very small disc winds around a larger circular disc of radius $R$. It is connected to it by a string of length l that remains tight. What distance does it travel before it hits the larger disc of radius $R$ ? I've estimated that it is $2\pi(l-R)$ based on assuming a spiral is a little like a series of concentric circ... | L^2 / (2R) | Expression | Physics | University |
1913579 | How much energy is consumed in 2.0 h by an electrical resistance of 385 {eq}\Omega
{/eq} when the potential applied across it is 99.0 V? | 0.051 kWh | Float | Physics | Senior High School |
1491503 | As usual, a drag coefficient of 0.5 is a reasonable guess. A cyclist going at a steady speed is mostly working to keep drag from slowing them down (rolling friction plays a part but is much smaller). Estimate what the power output is of a cyclist going at 40 km/hr. | 205W | Integer | Physics | Senior High School |
1247768 | At the Stanford LInear Accelerator (SLAC), two protons (rest mass:mp) are accelrated to 4/5ths the speed of light (0.8c). Suppose they are forced to collide head-on such that the product of collision is not moving at all with repsect to the lab. Immediately after this collision:
A) the mass of the products will be 1mp... | B | Multiple Choice | Physics | University |
1766754 | Singly charged gas ions are accelerated from rest through a voltage of 13.0 V. At what temperature will the average kinetic energy of gas molecules be the same as that given these ions? | 1.00573e5 K | Float | Physics | Senior High School |
1237872 | Alice throws a ball up in the air with an initial speed of 15 m/s, 5 m from a vertical wall. The initial velocity makes an angle of 30° with the vertical direction. After the ball hits the wall, the horizontal component of the velocity is reversed but the vertical component does not change. How far from Alice will the ... | 9.82 m | Float | Physics | Senior High School |
754203 | Sam, whose mass is 73 kg, straps on his skis and starts down a 48 m high, {eq}20^{\circ}
{/eq} frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Use work and energy to find Sam's speed at the bottom. | 15 m/s | Float | Physics | Senior High School |
738061 | A square loop is rotating in the plane of the page around an axis through its center. A uniform magnetic field is directed into the page. What is the direction of the induced current in the loop?
a. clockwise
b. counterclockwise
c. no induced current
d. unable to determine | c | Multiple Choice | Physics | Senior High School |
697885 | You place an object 24.6 cm in front of a diverging lens which has a focal length with a magnitude of 11.6 cm. Determine how far in front of the lens the object should be placed in order to produce a new image that is 3.70 times smaller than the original image. | 54.5 cm | Float | Physics | Senior High School |
440113 | Two protons at rest and separated by 6.00 mm are released simultaneously.
What is the speed of either at the instant when the two are 12.00 mm apart? | 3.39 m/s | Float | Physics | University |
1362392 | In a ferris wheel, one person is at the top and another at the bottom. The ferris wheel rotates such that the magnitude of the tangential velocity of each person is equal |v|top=|v|bottom. Determine for the person at the bottom, the force the seat exerts on the person. Use a standard man mass of 70kg and the speed of t... | 725.8 N | Float | Physics | Senior High School |
1184794 | A 396.1 grain bullet is fired horizontally into a 488.66 gram wooden block initially at rest on a horizontal surface. After impact the block slides 8.7 m before coming to rest. If the coefficient of kinetic friction between the block and the horizontal surface is 0.374, what is the speed of the bullet immediately befor... | 18 m/s | Float | Physics | Senior High School |
222361 | With an average acceleration of -0.96 m/s{eq}^2
{/eq}, how long will it take a cyclist to bring a bicycle with an initial speed of 14.8 m/s to a complete stop? | 15.41 s | Float | Physics | Senior High School |
1461338 | A {eq}26 \ kg
{/eq} mass is initially at rest. Suddenly three horizontal forces are pushing it. Two forces {eq}71 \ N
{/eq} and {eq}67 \ N
{/eq} are pushing the block eastward form the left side of the block, while the third force {eq}143 \ N
{/eq} is pushing it westward from the night. What is the acceleration of ... | 0.2 m/s^2 to the left | Float | Physics | Senior High School |
671273 | A pressure of 1.2 atm is how many psi? | 18 psi | Integer | Physics | Senior High School |
956557 | A horse draws a sled horizontally across a snow-covered field. The coefficient of friction between the sled and the snow is 0.195, and the mass of the sled, including the load, is 202.4 kg. If the horse moves the sled at a constant speed of 1.857 m/s, what is the power needed to accomplish this? | 718.99 W | Float | Physics | Senior High School |
601257 | A weather balloon is launched from the ground at a location that is 250 yards from a 65 foot royal palm tree. What is the minimal angle of elevation at which the balloon must take off in order to avoid hitting the tree? Assume that the balloon flies in a straight line and the angle of elevation stays constant. | 5 degrees | Integer | Physics | Senior High School |
402867 | A ball is thrown upward from the top of a 24.2 m tall building. The ball's initial speed is 12 m/s. At the same instant, a person is running on the ground at a distance of 32.8 m from the building. What must be the average speed of the person if he is to catch the ball at the bottom of the building? | 8.72 m/s | Float | Physics | Senior High School |
516804 | A tank is of the shape of an inversed cone. It is filled with water of density {eq}\rho = 1000 kg/m^3{/eq}. Find the work needed to pump the water in the tank to a point {eq}2{/eq} meters above the top of the tank. (Use {eq}g = 9.81 m/sec^2{/eq}) | W = \rho g\pi R^2\left[ \dfrac{H^2 + 8H}{12} \right] | Expression | Physics | University |
1297394 | Consider a balloon containing helium molecules at room temperature (20 degree Celsius) and atmospheric pressure. If the balloon has a spherical shape with a radius of 14 cm, what is the number of molecules in the balloon? | 2.88e23 | Float | Physics | Senior High School |
283509 | When a know standard resistor of {eq}2.0 \Omega
{/eq} is connected to the {eq}0.0\, cm
{/eq} end of a meter bridge, the balance point is found to be at {eq}55.0\,cm
{/eq}. What is the value of the unknown resistor?
A. {eq}1.10 \Omega
{/eq}
B. {eq}1.64 \Omega
{/eq}
C. {eq}2.44 \Omega
{/eq}
D. {eq}27.50 \Ome... | B | Multiple Choice | Physics | Senior High School |
1523712 | A projectile is shot from the ground at an angle of #(5 pi)/12 # and a speed of #7 m/s#. Factoring in both horizontal and vertical movement, what will the projectile's distance from the starting point be when it reaches its maximum height? | 1.25m | Float | Physics | Senior High School |
1700327 | A metal ball-bearing with a circumference of 41.6 mm weighs 9.43 g. what is the density of the metal in {eq}\rm g/cm^{3}
{/eq} (V of the sphere={eq}\rm \dfrac{4}{3}\pi r^{3}
{/eq} and circumference of a circle={eq}\rm 2\pi r
{/eq})? | 7.76 g/cm^3 | Float | Physics | Senior High School |
1554217 | A 15 N force is exerted on a 12 m long straight wire carrying a current, {eq}I=4A
{/eq}, with the wire placed at an angle of 20{eq}^{\circ} {/eq}. Find the magnetic field. | 0.913 T | Float | Physics | Senior High School |
432853 | A rocket, initially at rest on the ground, accelerates straight upward from rest with constant (net) acceleration {eq}\rm
29.4\ m/s^2
{/eq}. The acceleration period lasts for time {eq}\rm
7.00\ s
{/eq} until the fuel is exhausted. After that, the rocket is in free fall.
Find the maximum height {eq}\rm
y_{max}
{/... | 2878.69 m | Float | Physics | Senior High School |
1807581 | A boiler is used to heat steam at a brewery to be used in various applications such as heating water to brew the beer and sanitizing the brewing tanks. {eq}\rm
75.0\%
{/eq} of the heat produced by the boiler is used to create saturated steam at 12.0 bars (absolute) from liquid water at {eq}\rm
22 ^\circ C
{/eq}. If... | 977 kW | Float | Physics | University |
95508 | A car traveling at {eq}50 \ \rm ft / sec
{/eq} decelerates at a constant {eq}6
{/eq} feet per second. How many feet does the car travel before coming to a complete stop? | 208 ft | Integer | Physics | Senior High School |
1274386 | To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 10.9 g, and its initial temperature is {eq}-12.0^{\circ}C
{/eq}. The water resulting from the melted ice reaches the temperature of your skin, {eq}29.6^{\circ}C
{/eq}. How much heat is absorbed by the ice cub... | 1260.04 cal | Float | Physics | Senior High School |
103909 | Find the vector valued function for the path of a projectile launched at a height of 10 feet above the ground with an initial velocity of 78 feet per second and at an angle of 30 degrees above the horizontal. | r(t) = 67.550i + (10+39t-16.1t^2)j ft | Expression | Physics | Senior High School |
540991 | An 11 kg crate is pulled by a force of 150 N (parallel to the incline) up a rough {eq}35^o
{/eq} incline. The crate has an initial speed of 1.65 m/s. The crate is pulled a distance of 8.21 m on the incline by a 150 N force. u=0.324 The acceleration of gravity is {eq}9.8\ m/s^2
{/eq}. Answer in units of J. | 489 J | Float | Physics | Senior High School |
308160 | Use bisection to fetermine the drag coefficient needed so that an 82-kg parachutist has a velocity of 36 m/s after 4 s of free fall.
Note: The acceleration of gravity is 9.81 m/s{eq}^2
{/eq}. Start with initial guesses of {eq}x_1 = 3
{/eq} and {eq}x_u=5
{/eq} and iterate until the approximate relative error falls b... | 3.6406 | Float | Physics | University |
1511605 | A proton moves eastward in the plane of Earth's magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth s magnetic field points north and has a magnitude of {eq}5.2 \times 10^{-5}\ T
{/eq}? The acceleration of gravity is {eq}9.81\ \rm m/s^2
{/eq} and the charge... | 0.002 m/s | Float | Physics | Senior High School |
1938114 | An object is given two initial velocities, one that has a magnitude of {eq}60.0 \ ms^{-1}
{/eq} and points along a direction that is {eq}35.0
{/eq} degrees north of east and the other has a magnitude of {eq}55.0 \ ms^{-1}
{/eq} that points {eq}15.0
{/eq} degrees , also north of east.
Determine the resultant veloci... | 113.26 m/s at 25.44 degrees north of east | Float | Physics | Senior High School |
1398472 | A point charge {eq}\displaystyle Q
{/eq} moves on the x-axis in the positive direction with a speed of {eq}\displaystyle 330\ m/s.
{/eq}
A field point is on the y-axis at {eq}\displaystyle y = +80\ mm.
{/eq}
The magnetic field produced at the field point, as the charge moves through the origin, is equal to {eq}\di... | -80 mA along negative x-axis | Float | Physics | University |
1859269 | A helium balloon can just lift a load of 700 N. The skin of the balloon has a mass of 2.00 kg. What is the volume of the balloon? (The density of air is 1.29 kg/m{eq}^3
{/eq} and the density of helium is 0.179 kg/m{eq}^3
{/eq}) | 61.2 m^3 | Float | Physics | Senior High School |
1755214 | A 86.9-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of {eq}3.15 * 10^{-2} m^2
{/eq} and is completely submerged under the water. The volume of the person's body that is underwater is {eq}6.93 * 10^{-2} m^2
{/eq}. What is the density of the life jacket? | 441.269 kg/m^3 | Float | Physics | Senior High School |
282765 | The half-life of radium-226 is 1590 years. If a sample contains 400mg, how many mg will remain after 1000 years? | 257 mg | Float | Physics | Senior High School |
1123968 | In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 12.0 m/s. The batter hits the ball, and it leaves his bat with a speed of 25.0 m/s in exactly the opposite direction. If the bat is in contact with the ball for 1.4 ms, what is the magnitude of the average force exerted by the bat o... | 3828.57 N | Float | Physics | Senior High School |
1061525 | A figure skater with arms drawn in spins on the ice at a rate of 9rad/s and has a moment of inertia of 3kgm{eq}^2
{/eq}. What is the angular momentum in kgm{eq}^2
{/eq}/s of the skater? | 27 kg⋅m^2/s | Float | Physics | Senior High School |
1450820 | Many physical properties, such as force and mass, cannot be measured directly. Rather, some other physical property is measured and the desired physical property is then computed from the results. For example, a bathroom scale does not actually measure mass or "weight," but rather the compression distance of a spring. ... | 0.28 | Float | Physics | Senior High School |
1499581 | A loop of wire is situated inside a large solenoid, with the plane of the loop initially perpendicular to the axis of the solenoid. Current can be made to flow through the loop of wire if either:
A) the loop of wire is rotating within the solenoid, and a constant current is flowing through the solenoid wireB) the curr... | D | Multiple Choice | Physics | Senior High School |
1697686 | The (average) human body floats in water. SCUBA divers wear weights and a flotation vest that can fill with a varying amount of air to establish neutral buoyancy. Assume that a diver originally establishes neutral buoyancy at one depth. To establish neutral buoyancy at a lower depth, the diver should:
(A) let some air... | A | Multiple Choice | Physics | Senior High School |
1567101 | Two charged balls, one with a charge of +5.0 {eq}\mu
{/eq}C and the of +2.4 {eq}\mu
{/eq}C, are placed a distance d = 10.0 cm apart from each other and rigidly held in place. A third ball with a charge of -3.0 {eq}\mu
{/eq}C is dangled from a string between the two charged balls such that it remains in equilibrium. ... | 4.092 cm | Float | Physics | Senior High School |
1135918 | A 4.2 g bullet leaves the muzzle of a rifle with a speed of 372.4 m per s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the rifle? Answer in units of N. | 582 N | Integer | Physics | Senior High School |
1503383 | A non-conducting ring of radius 'r' has charge 'Q'. A magnetic field perpendicular to the plane of the ring changes as {eq}\frac{dB}{dt}
{/eq}. Find the torque experienced by the ring. | - ·Q·r^2·(dB/dt)/2 | Expression | Physics | University |
1220024 | A lost shipping container is found resting on the ocean floor and completely submerged. The container is 6.0 m long, 2.2 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When the balloon's radius is 1.7 m, the shipping c... | 52.2e+3 kg | Float | Physics | Senior High School |
811501 | A {eq}5.00 \times 10^2\ g
{/eq} block of metal absorbs {eq}5016
{/eq} joules of heat when its temperature changed from {eq}20 ^\circ C
{/eq} to {eq}30 ^\circ C
{/eq}. Calculate the specific heat of the metal. | 0.2398 calories/g | Float | Physics | Senior High School |
1437990 | A charge of 1.52E-9 C is placed at the origin, and a charge of 4.18E-9 C is placed at x = 1.69 m. Find the position at which a third charge of 3.03E-9 C can be placed so that the net electrostatic force on it is zero. | 0.63 m | Float | Physics | Senior High School |
1298144 | What are the forces acting on a racing car while it slows down around a turn? | The forces acting on a racing car as it slows down around a turn include friction, the applied force, gravity, and the normal force. | List | Physics | Senior High School |
691509 | What is it called when an interference pattern has a pattern of bright and dark spots? | Interference fringe pattern | String | Physics | Senior High School |
813545 | What potential difference is needed to stop an electron that has an initial velocity of {eq}6.0 \times 10^5
{/eq} m/s? | 1.023 V | Float | Physics | Senior High School |
2036389 | What is the speed, relative to Earth, of a uniformly moving spaceship whose clock runs 10 s slow per hour compared with an Earth-based clock? | 2.2e7 m/s | Float | Physics | University |
115038 | A beam of neutral hydrogen atoms with a speed of {eq}10^4 \text { m/s}
{/eq} m/s along the x-axis enters a 1-m long region with a magnetic field. The gradient is 0.01 T/m and its dipole moment is {eq}9.27 \times 10 ^{-24} \text { J/T}
{/eq}. Find the acceleration of the atoms while in the magnetic field. | 55.51 m/s^2 | Float | Physics | University |
1396295 | A system performs {eq}720\;L \cdot atm\;of\;pressure-volume\;work
{/eq}({eq}1\;L \cdot atm=101.325\;J
{/eq}) on its surroundings and absorbs {eq}5750\;J
{/eq} of heat from its surroundings. What is the change in internal energy of the system? | -67204 J | Integer | Physics | Senior High School |
1536840 | What is the wavelength of a proton traveling at 16.9% of the speed of light? {eq}\rm (M_p = 938.27 \ MeV/c^2 = 1.6726 \times 10^{-27} \ kg,
{/eq} {eq}\rm \ c = 3 \times 10^8 \ m/s)
{/eq} | 7.7e-15 m | Float | Physics | University |
1782222 | A girl starting from rest at the top of a 40 m jump, inclined at 30{eq}^o
{/eq} above the horizontal, has 0.15 coefficient of friction. The jump ends with a frictionless, horizontal part. How far does she land away from the jump, which is 50 m above the horizontal land below? | 54.40 m | Float | Physics | Senior High School |
1576336 | Orange light ({eq}\lambda
{/eq} = 630 nm) hits diffraction grating which has a line spacing of 1 {eq}\mu m
{/eq}. The interference pattern is seen on a screen that is 4.0 m away. What is the distance between the central bright spot and the first order bright spot on the screen. | 2.52 m | Float | Physics | Senior High School |
638906 | Glycerin is poured into an open U-shaped tube until the height in both sides is 32 cm. Ethyl alcohol is then poured into one arm until the height of the alcohol column is 24 cm. The two liquids do not mix. What is the difference in height between the top surface of the glycerin and the top surface of the alcohol? | 9 cm | Integer | Physics | Senior High School |
1836844 | A 958 N rocket is coming in for a vertical landing. It starts with a downward speed of 28 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing. During this landing maneuver, what must be the thrust due to the rocket's engines?
A. 350 N
B. 700 N
C. 1300 N
D. 1500 N | C | Multiple Choice | Physics | Senior High School |
1153000 | Calculate how fast atoms of oxygen move in the air at standard temperature and pressure (STP). | 460.44 m/s | Float | Physics | Senior High School |
1271032 | Car B weighing 3900 lbs and traveling west at 10 mi/hr collides with car A weighing 4000 lbs and traveling north at 45 mi/hr as shown. If the two cars become entangled and move together as a unit after the crash, compute the magnitude, {eq}v
{/eq} of their common velocity immediately after the impact and the angle {eq... | v = 23.30 mi/hr
q = 12.225° | Float | Physics | University |
1382552 | This question already has an answer here: Differential euqation for a pendulum: $ {d^2\alpha \over dt^2} + {g \over L} \cdot \alpha = 0 $ (1 answer) Closed 5 years ago. How can I solve the following second order differential equation $$ \frac{d^2\theta \:}{dt^2\:}\:=-\frac{g\theta \:\:}{L} $$ with initial conditions $$... | \theta(t)=\theta_0\cos \left(\sqrt{\frac gl}t \right)+v_0\sqrt{\frac lg}\sin \left (\sqrt{\frac gl}t \right) | Expression | Physics | University |
534058 | Two objects of masses {eq}m_{1}
{/eq} = 4.00 kg and {eq}m_{2}
{/eq} = 9.00 kg are connected by a light string that passes over a frictionless pulley. The object {eq}m_{1}
{/eq} is held at rest on the floor, and {eq}m_{2}
{/eq} rests on a fixed incline of {eq}\theta
{/eq} = 42.0{eq}^{\circ}
{/eq}. The objects are ... | 39.63 N | Float | Physics | Senior High School |
706511 | A group of engineers is preparing a satellite to land by moving it 10% closer to Earth in each rotation. Which statement is correct about the rotational inertia of the satellite?
O Rotational inertia first decreases and then increases as the satellite is ready to land.
O Rotational inertia decreases proportional t... | A | Multiple Choice | Physics | Senior High School |
440310 | {eq}M_1
{/eq} is a spherical mass (38.6 kg) at the origin. {eq}M_2
{/eq} is also a spherical mass (10.3 kg) and is located on the x-axis at x = 59.8 m. At what value of x would a third mass with a 20.0 kg mass experience no net gravitational force due to {eq}M_1
{/eq} and {eq}M_2
{/eq}? | 39.46 m | Float | Physics | Senior High School |
2087409 | A 9-turn coil, 1.2 cm in diameter is rotated at 15 rev/s about an axis perpendicular to a uniform magnetic field. A voltmeter connected to the coil through rotating contacts reads a peak value of 440 {eq}\mu
{/eq}V.
What is the magnetic-field strength? | 4.59e-3 T | Float | Physics | Senior High School |
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