Answer:
The tension in the string is quadrupled i.e. increased by a factor of 4.
Explanation:
The tension in the string is the centripetal force. This force is given by
m is the mass, v is the velocity and r is the radius.
It follows that , provided m and r are constant.
When v is doubled, the new force, , is
Hence, the tension in the string is quadrupled.
Answer:
Work done by friction along the motion is given as
Explanation:
As per work energy theorem we can say
Work done by all forces = change in kinetic energy of the system
so here car is moving from bottom to top
so here the change in kinetic energy is total work done on the car
so here we will have
now plug in all data in it
Answer:
Explanation:
Frictional force due to road is pushing the cycle in forward direction
so it is given as f1
also the air drag is always in opposite direction of motion so it is given as f2
so here net force on the bicycle is given as
now initially the speed of cycle is increasing with time
so here we can say that net force on the cycle must be positive in direction
so we have
so we have