A box of weight 74 N is sliding on a horizontal surface at a constant velocity due to an external force F-> of magnitude 4.8
N. A normal force (n->) and a friction force (f->) also act on the box. What is the magnitude of the friction force?
74 N
2.4 N
69 N
4.8 N
9.6 N
74 N
2.4 N
69 N
4.8 N
9.6 N
1 answer:
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Answer
given,
Tension of string is F
velocity is increased and the radius is not changed.
the string makes two complete revolutions every second
consider the centrifugal force acting on the stone
=
now centrifugal force is balanced by tension
T =
From the above expression we can clearly see that tension is directly proportional to velocity and inversely proportional to radius.
When radius is not changing velocity is increasing means tension will also increase in the string.