Arollercoaster starts at a height of 30m above the ground. at the bottom of a loop. the rollercoaster is at a height of 10m. approximately, how much gravitational potential energy is lost by a 75kg rider?
a. 19.6 joules. eliminate.
b. 1470 joules.
c. 14,700 joules
d. 22,050 joules

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You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?