Two tennis balls fall through the air from a tall building, One of them is fille

Question

Two tennis balls fall through the air from a tall building, One of them is filled with lead Pellets. The ball to reach the ground first is the A) regular ball. B) same for both c) lead-filled ball. A push on a 1-kg brick accelerates it. Neglecting friction, equally accelerating a 10-kg brick required A) one-tenth the amount of force. B) 10 times as much force. C) just as much force. D) 100 times as much force. E) none of the above A rock is thrown vertically into the air. At the top of its path the net force on it is A) less than mg. B) more than mg. C) mg. When a tennis racquet hits a ball, A) the ball is set in motion with the same speed of the racquet upon contact. B) the ball hits the racquet. C) the racquet loses as much speed as the ball gains. D) all of the above While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up A) make an action-reaction pair of forces. B) do not make an action-reaction pair of forces. C) need more information You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg 23 you'll momentarily accelerate from the wall at about A) 0.8 m/s^2. B 8.0 m/s^2. C) 0.08 m/s^2 D) none of the above An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the A) grip of the archer's hand on the bow. B) arrow's push against the bowstring C) friction of the ground against the archer's feet. D) combined weight of the arrow and bow string. If vertically falling rain makes slanted 45 degree streaks on the side windows of a moving car, the speed of the car A) equals the speed of the falling drops. B) is less than the speed of the falling drops. C) exceeds the speed of the falling drops. D) need more information When a rocket forces exhaust gases downward, the exhaust gases A) play no further role in the motion of the rocket. B) exert an upward force on the rocket. C) as the name implies, soon exhaust their influence.

Explanation / Answer

Q18.

option B is same.

both will reach the ground at same time as acceleration due to gravity is same for both the objects

and time taken depends upon the height only.

Q19.

as force=mass*acceleration

to maintain same acceleration, force required will be 10 times more

hence option B is correct.

Q20.

at top of the path, the force is vertically downward and equal to m*g.

hence option C is correct.

Q21.

due to newton's third law, as the racquet hits the ball, the ball also hits the racquet.

so option B is correct.

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