James gently releases a ball at the top of a slope, but does not push the ball. The ball rolls down the slope. Which force cause
d the ball to move downhill?
A.
applied force
B.
drag force
C.
friction force
D.
gravitational force
E.
normal force
A.
applied force
B.
drag force
C.
friction force
D.
gravitational force
E.
normal force
2 answers:
Answer:
Gravitational force
Explanation:
When ball is placed on the slope and slightly disturbed then ball will roll down the slope with increasing speed.
This increasing speed or acceleration of ball is due to the component of weight of ball which is along the inclined plane.
As shown in the FBD the component of weight perpendicular to inclined plane is used to counterbalance the normal force while other component of weight parallel to the inclined plane is accelerating the ball down the plane
So here we can write
so here
so ball is accelerating due to gravitational force
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Answer:
t = 1.51 hours
Explanation:
given,
Speed of space shuttle. v = 27800 Km/h
Radius of earth, R = 6380 Km
height of shuttle above earth, h = 320 Km
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r' = R + h
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