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A 0.450kg rock is dropped 14.0m into 3.0kg of water. If all the rock's kinetic energy is converted to thermal energy in the water, what's the water's temperature increase?
Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium (c = 2.5 eV) cathode. Find the maximum kinetic energy of the photoelectrons and (b) the stopping potential.
The rotating sprocket tip at the end of the guide bar has a radius of 0.0343 m. Find the angular speed of the sprocket tip
Pretend a person can walk only at a certain pace no faster, no slower. If you time her uninterrupted walk across a room of known length, you can compute her walking speed.
Two 5000 kg passenger cars roll without friction (one at 1 m/s, the other at 2 m/s) toward one another on a level track. They collide, couple, and roll away together with the combined momentum.
A girl delivering newspapers travels 2 blocks west, 2 blocks north, and then 5 blocks east. What is her resultant displacement
A space station in the forf of a large wheel, 129m in diameter, rotates to provide an "artificial gravity" of 6.10 m/s^2 for people located at the outer rim.
When you see a traffic light turn red, you apply the brakes until you come to a stop, what was your average velocity during braking
Your sofa won't fit through the door of your new sixth-floor apartment, so you use a 1.08kW motor to lift the 84.4kg sofa 15.6m from the street. How much time does the lift take
A solid aluminum cylinder with density equal to 2700 kg/m3 has the weight equal to 0.66 N in air, what is the density of the liquid
a balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.6 kg. find the magnitude of the initial acceleration of the balloon
a roller coaster had an intial velocity of 80 ms and abruptly came to a stop at the end of the ride. it took 10 seconds
An athlete at the gym holds a 2.5 kg steel ball in his hand. His arm is 70 cm long and has a mass of 4-kg. What is the magnitude of the torque about his muster if he holds his arm straight out to his side, parallel to the floor.
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