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A blue ball is thrown upward with an initial speed of 22.2 m/s, from a height of 0.6 meters above the ground. 2.7 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 6 m/s from a height of 26.7 meters above the ground. The force of gravity due to the earth results in the balls each is having a constant downward acceleration of 9.81 m/s2.
How long after the blue ball is thrown are the two balls in the air at the same height?
A double speed trap is set up on a freeway. One police cruiser is hidden behind a billboard, and another is some distance away under a bridge. As a sedan passes by the first cruiser, its speed is measured to be 99.7 mph.
A man stands on the roof of a building of height 13.6m and throws a rock with a velocity of magnitude 31.8m/s at an angle of 31.6 degrees above the horizontal. compute the maximum height above the roof reached by the rock
A lottery machine uses blowing air to keep 2000 Ping-Pong balls bouncing around inside a 1.0m X 1.0m X1.0m box. The diameter of a Ping-Pong ball is 3.0 cm. What is the mean free path between collisions?
A hotel elevator ascends 170 {rm m} with a maximum speed of 5.90 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.3 {rm m/s^2}.
A 2.0 kilogram block is at rest on a horizontal table given the coefficients of friction between the block and the table: μs = 0.34 and μk=0.29; evaluate what horizontal force is needed to cause the block to move
A roller coaster car travels down a hill and is moving at 18 m/s as it passes through a section of straight, horizontal track. what is the speed of the car at the top
The coeffiecient of static friction between Jimmy's hand and his tennis racket is 0.45. How hard must he squeeze the racket if he wants to exert a force of 200 N along the longitudinal axis of the racket
a sprinter accelerates from rest to a top speed with an acceleration whose magnitude is 3.50 ms2. after achieving top
What approximations or simplifying assumptions must you make in the calculations? (Note: Some of these choices are false because they are wrong physics!)
Three 1.0-C charges are equally spaced on a straight line. The separation of each charge from its neighbor is 100m. Find the force on the center charge if (a) all charges are positive, (b) all charges are negative, and (c) the rightmost charge is neg..
A golden retriever is sitting in a park when it sees a squirrel. What is the magnitude of the dog's change in momentum
4.60g of nitrogen gas at 22.0?C and an initial pressure of 3.30atm undergo an isobaric expansion until the volume has tripled. A) How much heat energy is transferred to the gas to cause this expansion
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