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A rock is thrown directly upward from the edge of the roof of a building that is 32.5 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the rock thrown?
A ball of mass m makes a head-on elastic collision with a second ball (at rest), What is the mass of the second ball
There are four answers required for this question. A playground merry-go-round (like a disk) has a mass of 220 kg and a diameter of 4.4 meters is rotating at 30 rpm. What is the rotational kinetic energy of the merry-go-round after the children jum..
Two forces, and , act on the 7.00-kg block shown in the drawing. The magnitudes of the forces are F1=55.5 N and F2=33.5 N. Find the horizontal acceleration of the block
During a physics experiment, helium gas is cooled to a temperature of 10.0K at a pressure of 9.00×10?2atm. What is the avergage energy per atom
A factory worker pushes a 28.0kg crate a distance of 4.8m along a level floor at constant velocity by pushing downward at an angle of 28 below the horizontal. How much work is done by the normal force
A passenger on a stopped bus notices that rain is falling vertically just outside the window. Find the speed of the raindrops, given that the bus is moving with a speed of 17.2 m/s
For the superball in the previous question, if it was in contact with the table for 32 ms, calculate the average force exerted on the ball by the table
A ball rolls down a hill. What causes constant acceleration down the hill? What determines how much acceleration there is (is the angle/incline of the hill a factor)
question1vector a points alone the y access and has a magnitude of 100 units vector b points at an angle of 60 degrees
The number density in a container of neon gas is 4.70×1025m?3. The atoms are moving with an rms speed of 640m/s. What is the pressure inside the container
An electron is moving at a speed of 1.0 x10^4 m/s in a circular path of radius of 2.1cm inside a solenoid. The magnetic field of the solenoid is perpendicular to the plane of the electron's path. The solenoid has 25 turns per centimeter.
A partly-full paint can has 0.55 U.S. gallons of paint left in it. (a) What is the volume of the paint, how thick is the layer of wet paint
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