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A 91 crate, starting from rest, is pulled across a floor with a constant horizontal force of 390 . For the first 13 the floor is frictionless, and for the next 13 the coefficient of friction is 0.20. What is the final speed of the crate?
Jason is practicing his tennis stroke by hitting balls against a wall. The ball leaves his racquet at a height of 60 cm above the ground at an angle of 80' with respect to the vertical. Is ball on its way-up or down when the ball strikes the wall?
A box is at rest on a horizontal table. Is it because of the first law, second law, and or third law of motion that those two forces are equal
Two particles with masses 2m and 5m are moving toward each other along the x axis with the same initial speeds vi. Find the final speeds of the two particles in terms of vi. particle 2m
Suppose that an electron trapped in a one-dimensional infinite well of width 322 pm is excited from its first excited state to the state with n = 5. What energy (in eV) must be transferred to the electron for this quantum jump
A compact disc, initially at rest, is spun up to an angular velocity of 22 rad/s by a constant angular acceleration of 4.0 rad/s^2. How much time does the disk take to reach maximum velocity
A rocket is launched at an angle of 52° above the horizontal with an initial speed of 103 m/s. The rocket moves for 3s along its initial line of motion with an acceleration of 32 m/s2. At this time, its engines fail and the rocket proceeds to move..
A 2.90mW helium neon laser emits a visible laser beam with a wavelength of 635nm. How many photons are emitted per second
A 101 g ball is tied to a string. It is pulled to an angle of 5.20 degrees and released to swing as a pendulum. How long is the string
A straight object of length 2.7 cm lies along the central axis of a spherical mirror with focal length 8.5 cm. What is the length of its image in the mirror
A husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 3.0L in the warm store at 74?F. By how much has the volume decreased
While on a camping trip, you would like to carry water from the lake to your campsite. find Which bucket holds more water
A bicycle is moving at a speed v = 4.26 m/s. If the radius of the front wheel is 0.450 m, how long does it take for that wheel to make a complete revolution.
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