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You push a 2 kg block along a frictionless surface with a constant force. Starting from rest the block reaches a final speed of 2 m/s in 10 m. What is the instantaneous power (in W) that you are supplying 2 seconds after you start pushing?
A friend speeds by you in her spacecraft at a speed of 0.770 c. It is measured in your frame to be 4.30m long and 1.50m high. How many seconds elapsed on your watch when she saw 22.0s pass on hers
You (mass 55 kg) are riding your frictionless skateboard (mass 5.0 kg) in a straight line at a speed of 4.7m/s, What is your new speed, while holding the flour sack
Objects A and B are both positively charged. Both have a mass of 200g , but A has twice the charge of B. If the objects are released, what is the initial acceleration of A
A bat moving at 7.2 m/s is chasing a flying insect. The bat emits a 43 kHz chirp and receives back an echo at 43.68 kHz. At what speed is the bat gaining on its prey
A guy is spinning initially at a constant rate with his arms at his sides. He then puts his arms straight out. How much does his moment of inertia change when he sticks his arms out
A proton (mass 1.67*10 ^-27 kg) is moving at 1.40*10 ^-6 m/s directly toward a stationary helium nucleus (mass 6.64*10 ^-27 kg), After a head-on elastic collision, what is the helium's velocity
Monochromatic light is incident on a diffraction grating and the first maximum is observed at an angle 5.2 degrees. At what angle is the 4th maximum seen
Light strikes a surface at an angle of 47 degrees. The angleof refraction is measured to be 34 degrees. What is the index of refraction of the material
A mass of 180g is held by a horizontal spring of constant 22 N/m. It is displaced from its equilibrium position and released from rest. What is the magnitude of initial displacement
The force stretching the D string on a certain guitar is 170 N. The string's linear mass density is 0.006 kg/m, What is the speed of the waves on the string
q1. a parachutist descending at a speed of -13.0 ms loses a shoe at the altitude of 54.0 m.a when does the shoe reach
An eastbound subway train accelerates from rest at 1.22 m/s2 along a straight track. How far apart are the trains when the eastbound subway train is traveling at the same speed as the westbound train
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