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Young Jeffrey is bored, and decides to throw some things out of the window for fun. But since he is also very curious, he decides to do so in a controlled way. Jeffery takes a rock, his tennis ball, and one of his fathers golf balls and sets them on the sill of an open window. Then he uses a flat board to carefully push them all out of the window at the same time. The 2nd story window is 10.0 ft above the ground, and all three objects hit the ground just 0.500 ft away from the base of the house at the same time, 0.788s after they're dropped. The rock hits with a thud and stays put, but the other two objects bounce. After another 0.591s, the tennis ball reaches a maximum height of 5.63 ft, while the golf ball is 7.88 ft off the ground and still rising. Both have travelled an additional 0.375ft horizontally. Calculate the magnitude of the average velocity of each object during these 1.38 seconds. Which object has the largest instantaneous velocity at the end of this time period?
The car that hits a concrete barrier and takes 0.3 seconds to stop.
What is the period of oscillation of the scale? State your reply numerically in seconds.
A 80 kg person sits on a 4 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.3 cm in diameter. Find the pressure in pascals exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.
What is the speed of a car going v = 1mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately. mke Use of the facts that 1 mile = 1609m and 1hour = 3600s.
A 400 kg car sits 2 m to the right of a fulcrum assume car is on a weightless rod, how far to the left of the fulcrum should an effort of 200 N be applied to keep the system in quilibrium.
What mass of water (at 4.0 C) can be contained in a rectangular box whose dimensions are 10 cm by 5.00 cm by 1.00 cm? The density of water at 4C is 1.000 X 10 kg/m-cubed.
What is the change in length of the rope whilst the skier has the acceleration whose magnitude is 0.65 m/s2.
If the mass of the child and sled is 40 {rm kg}, what average force do you need to apply to stop the sled? Use the concepts of impulse and momentum.
What is the magnitude of the apparent weight of an 80-kg astronaut 5200-km from the center of the Earth's Moon in a space vehicle moving at constant velocity.
A runner moving at a constant speed of 11.7 m/s rounds a curve of radius 4.10 m. calculate the acceleration of the runner. (State the magnitude of this acceleration.)
Two objects each have a positive charge. The total charge on both objects is 390 µC. When the objects are placed a distance of 1.20 m apart, each exerts an electrostatic force of 21.3 N on the other. What is the charge on each object? (Round the a..
A 100 ball on a 60 long string is swung in a vertical circle whose center is 200 above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 above the floor.What is the..
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