1. A 100 kg satellite is in orbit around the Earth at a radius of 8.4x106m. What
ID: 1864019 • Letter: 1
Question
1. A 100 kg satellite is in orbit around the Earth at a radius of 8.4x106m. What is the work done by gravity as the satellite moves through one complete orbit? A) 5.2x1010J B) 8.2x109J C)0 D) 980 J 2. A 840 N person is riding on a roller coaster as it goes through a vertical loop Which statement below is true at the lowest position of the loop? A) The normal force on the person is 840 NN B) The normal force on the person is greater than 840 N C) The normal force on the person is less than 840 N D) The normal force is zero 3. A60 N crate is sitting on a horizontal surface with a coefficient of static friction of .5 There is a horizontal force of 20 N acting on the crate. What is the force of static friction acting on the crate? A)20N B)60N C) 30N D) 0Explanation / Answer
(1) The motion of the satellite is perpendicular to the direction of displacement of the satellite, hence the work done by gravity is zero.
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