Question 19 of 41 A car, resting on the surface of the Earth. has a much smaller mass than the Earth does. The gravitational force of the car on the Earth is the car. C) A, weaker than C) B. stronger than I L) C. equally strong as Reset Selection C] Mark for Review What's This? Question 20 of 41 Which one ofthe Fundamental Forces of Nature is most directly responsible for the normal force of support that arises from a solid surface? C) A, Gravitation C) B. Nuclear Weak Force (or Weak Interaction) O C. Nuclear Strong Force (or Strong Interaction) C) D, Electromagnetism Reset Selection C] Mark for Review What's This? 0.25 Points 0.25 Points the gravitational force of the Earth on Question 21 of 41 0.25 Points While watching an ice-skating performance, you notice that skaters who perform spins tend to spin faster when they pull in their legs and arms closer to the center of their body, and spin slower as they extend their limbs outward from their body. Assuming that external friction on each skater is negligibly small, what is the primary reason for this behavior? C) A. The skater's angular momentum remains nearly constant. 0 B. The skater's moment ofinertia remains nearly constant. 0 C. The skater's rotational kinetic energy remains nearly constant. Reset Selection [:] Mark for Review What's This