In interaction of action reaction pairs involving earth and everyday objects the effect on earth's motion often negligible because
a) field forces do not obey Newton's 3rd law.
b) Earth has great inertia
c) Everyday objects cannot exert forces on earth
d) all of the above
Hepl please by solving this
Answers
Answer:
The change in the horizontal velocity of a 12-kg scooter is +0.5 m/s.
What is the net horizontal force acting on it?
a. +24 N
b. +6.0 N
c. greater than 0 N
d. 0 N
_____ 2. A student holds a 6-N block of wood from a spring balance in an
express elevator that maintains constant velocity traveling between
floors. A spring scale reading of 5.9 N indicates that the elevator is
a. starting an ascending trip.
b. ending an ascending trip.
c. ending a descending trip.
d. traveling between floors.
_____ 3. During a three-part circus stunt, a clown holds a ball. The clown then
tosses the ball upward. After releasing it, the ball is caught a few
moments later from above by another clown on a trapeze. Which set of
data could represent the normal force exerted by the ground on the first
clown during the stunt? The force due to gravity on the clown is 680 N
and that on the ball is 20 N.
a. 700 N, 695 N, 720 N
b. 700 N, 695 N, 700 N
c. 700 N, 705 N, 700 N
d. 700 N, 705 N, 680 N
_____ 4. In which situation is the net force acting on a car zero?
a. The car increases speed and changes direction.
b. The car increases speed but does not change direction.
c. The car maintains its speed but changes direction.
d. The car maintains both its speed and dire
Answer:
option (B) is correct.
as the earth is huge( i.e it has greater mass) in comparison to everyday objects present on earth, so earth has greater inertia and hence action reaction pairs involving earth and everyday objects, the effect on earth's motion is often negligible.