1- If the Earth exerts a gravitational force of 1000 N on an orbiting satellite, how much force does the satellite exert on the Earth? 2- If you are on a small raft next to a dock and try to jump from the raft to the dock only to fall into the water, what physics principle have you overlooked? 3- A child can throw a ball at about 20 mph. Some professionals can throw a ball at about 100 mph. How much more energy does the professional give to the faster ball? (Hint: Speed is squared for kinetic energy) 4- A woman is riding her bicycle. If she expends 1000 W of power to deliver mechanical energy to her bicycle as a rate of 100 W, what is her efficiency? 5- True or False: If somehow all gravitational force between the Earth and the Moon vanished to zero, the path of the Moon would continue to circle around the sun and Earth. 6- True or False: The vertical component of a ball kicked off a high cliff when air drag is negligible is identical with the motion of vertical free fall. 7- Find the change in the force of gravity between two planets when their masses remain the same but the distance between them is increased ten times using this formula: F = GmM/d2 8- Find the change in the force of gravity between two planets when both their masses are doubled and the distance between them is also doubled using this formula: F = G2m2M/(2d2) 9- Calculate the speed, in m/s, at which the Earth revolves around the Sun. Assume that the Earth’s orbit is nearly circular. Use this equation: v = distance/time, where distance is the circumference of the Earth’s orbit, 2πr (1.5 X 1011m), and time is 1 year. (Hint: convert 1 year to seconds).
Dear Sir/ Madam,
1- If the Earth exerts a gravitational force of 1000 N on an orbiting satellite, how much force does the satellite exert on the Earth?
2- If you are on a small raft next to a dock and try to jump from the raft to the dock only to fall into the water, what physics principle have you overlooked?
3- A child can throw a ball at about 20 mph. Some professionals can throw a ball at about 100 mph. How much more energy does the professional give to the faster ball? (Hint: Speed is squared for kinetic energy)
4- A woman is riding her bicycle. If she expends 1000 W of power to deliver mechanical energy to her bicycle as a rate of 100 W, what is her efficiency?
5- True or False: If somehow all gravitational force between the Earth and the Moon vanished to zero, the path of the Moon would continue to circle around the sun and Earth.
6- True or False: The vertical component of a ball kicked off a high cliff when air drag is negligible is identical with the motion of vertical free fall.
7- Find the change in the force of gravity between two planets when their masses remain the same but the distance between them is increased ten times using this formula: F = GmM/d2
8- Find the change in the force of gravity between two planets when both their masses are doubled and the distance between them is also doubled using this formula: F = G2m2M/(2d2)
9- Calculate the speed, in m/s, at which the Earth revolves around the Sun. Assume that the Earth’s orbit is nearly circular. Use this equation: v = distance/time, where distance is the circumference of the Earth’s orbit, 2πr (1.5 X 1011m), and time is 1 year. (Hint: convert 1 year to seconds).
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