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while standing in a low tunnel you push up on the ceiling with a force of 100N. your mass is 70kg. What force does the floor exert on you?
A uniform disk of mass m=0.400 kg and radius R=20.0 cm is pinned to the wall near its rim. Find the angular frequency of oscillation if the disk is set swing back and forth
A thin film of MgF2 (n=1.38) coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 500nm and 625nm.
The pressure gauge on a tank registers the gauge pressure, which isthe difference between the interior and exterior pressure. When thetank is full of oxygen (O2), it contains 15.0 kg of the gas at a gauge pressure of 35.0 atm.
A telescope has magnification of 40 and length of 1230mm. What are the focal lengths of the eyepeice
a 1.5 kg ball falls onto a floor. just before it strikes the floor its velocity is 12 m/s. the ball bounces up with a velocity of 10 m/s. find the impulse on the ball
A box with a mass of 8 kg is lifted (without acceleration) through a height of 9 m, in order to place it upon the shelf of the closet.
Compare 900 on the AM dial to 90 on the FM dial. Which has the longer wavelength? By what factor is it larger
A 5.7x10^2 kg hot-air balloon takes off from rest at the surface of the earth. The wind and lift forces take the balloon up, doing +9.7 x 10^4 J of work on the balloon in the procedure. At what height above the surface of the earth does the balloo..
A 2.00 L container is filled with an ideal gas at a temperature of 18.0°C and 1 atm pressure. The container is then heated until the pressure is 3 atm. The volume is held constant. What is the change in the temperature?
A device consisting of four heavy balls connected by low mass rods is free to rotate about an axle. It is initially not spinning. what is the angular speed of the device
A 23 bullet traveling 245 penetrates a 3.0 block of wood and emerges cleanly at 195 .If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges.
A proton accelerates from rest in a uniform electric field of 680 N/C. At some later time, its speed is 1.42 106 m/s. How long does it take the proton to reach this speed
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