Question

A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the A) heavy rock. B) same for both C) light rock. A 10-N filling object encounters 4 N of air resistance. The net force on the object is. A) 4 N. B) 10 N. C) 0 N. D) 6 N. E)none of the above Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie b then A) 90 N. B) 500 N. C) 250 N. D) 410 N. E) none of the above Earth pulls on the Moon, and the Moon pulls on Earth which tells us that A) both Earth and Moon circle a common point. B) these two pulls comprise an action-reaction pair. C) more massive objects pull harder. D) all of the above A fast-moving missile soaring overhead possesses A) force. B) speed. C) both of these D) neither of these The force exerted on the tires of a car that directly accelerate it along a road is exerted by the A) air. B) engine. C) road. D) tires. E) none of the above An automobile and a golf cart traveling at the same speed collide head-on. The impart force is A) the same for both. B) greater on the golf cart. C) greater on the automobile. An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the A) friction of the ground against the archer's feel. B) grip of the archer's hand on the bow. C) arrow's push against the bowstring D) combined weight of the arrow and bowstring.

Answer 1

7.

   as the heavy rock and light rock are falling from a same level, the greatest aur resistance can be encountedred by the heavy rock.

Ans --------A

8.As the object falling of weight 10 N which is directed downward and the air resistance dierected upward of 4 N so the net force is 10-4 = 6 N

Ans ------- D

9.As skydiver reaches terminal velocity then the weight and the air resistances are same in magnitude so the answer is 500 N

Ans -----B

10 As the earth pulls on the moon and moon pulls on the earth------these two pulls comprise an action- reaction pair

Ans ------B

11. Ans -----C, both speed and force

12.the force exerted on the tires of a car that directly accelerate it along a road is exerted by the engine of the car

1