Please I want someone to answer it all When a spinning ice skater brings her arm
ID: 1612625 • Letter: P
Question
Please I want someone to answer it all
When a spinning ice skater brings her arms in close to her body she spins faster because: (a) Her rotational inertia decreases. (b) Rotational momentum is not conserved. (c) Her rotational momentum increases. (d) The force acting on her is greater. Answer: ____ A satellite put into orbit around the earth (a) Does not experience the effect of gravity. (b) Falls continuously around the earth. (c) Has no force acting on it. (d) Requires constant power from a rocket to keep it in orbit. Answer: ___ You are standing near the center of a playground merry-go-round that is rotating at constant rotational speed. As you move outwards towards the edge: (a) The combined rotational inertia of you and the merry-go-round decreases. (b) The rotational speed of the merry-go-round remains the same. (c) Rotational momentum is not conserved. (d) The rotational speed of the merry-go-round decreases. Answer: _____ When you walk (a) You and the floor push on each other equally. (b) The floor pushes on you with a greater force than you push on the floor. (c) You push on the floor with a greater force than the floor pushes on you. (d) Only you push on the floor because a floor can't push on you. Answer: ____ You stand on a bathroom scale in an elevator. The scale will read less than your normal weight when the elevator (a) Starts suddenly upward. (b) Travels upward at constant speed. (c) Travels downward at constant speed. (d) Slows down to stop at the second floor, after rising from the first floor. Answer: ___Explanation / Answer
for 6>>>>option A is correct............Iw=constant , w is increases ,I is decreses.
for 7>>>>option D is correct
for 8>>>>option D is correct......... as R is increases,I is increases then w is decreses
for 9>>>>option C is correct......... person applies greater force on the floor
for 10>>>>option D is correct.......whenever moving upword direction we feel lossin weight