How long does it take a 5kW shower to use 25000J of energy?
1 answer:
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If it takes 
seconds to reach the car, then the distance 
is 
.
The bear's distance from the tourist's starting point is
For maximum, we set the equations equal to each other:
so the distance is
The bear's distance from the tourist's starting point is
For maximum
so the distance is
The correct answer to the question is : 9375 N.
CALCULATION:
As per the question, the mass of the car m = 1500 Kg.
The diametre of the circular track D = 200 m.
Hence, the radius of the circular path R =
=
= 100 m.
The velocity of the truck v = 25 m/s.
When a body moves in a circular path, the body needs a centripetal force which helps the body stick to the orbit. It acts along the radius and towards the centre.
Hence, the force acting on the car is centripetal force.
The magnitude of the centripetal force is calculated as -
Force F =
=
= 9375 N. [ANS}
The centripetal force is provided to the car in two ways. It is the friction which provides the necessary centripetal force. Sometimes friction is not sufficient. At that time, the road is banked to some extent which provides the necessary centripetal force.