Home
Class 9
PHYSICS
A boy is moving on a straight road again...

A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km, he forgot the correct path at a round about, of radius 100m. However, he moves on the circular path for one and half cycle and then he moves forward upto 2.0 km. Calculate the work done by him.

Text Solution

Verified by Experts

Frictional force, F = 5 N
Total distance covered by the boy, `s = 1.5 km + 1.5 (2 pi xx 100m) + 2.0 km`
= 1500 m + 942m + 2000m
= 4442 m
work done, W= Fs = (5N) (4442 m) = 22210J
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    PRADEEP|Exercise Long Answer Questions|8 Videos

  • WORK AND ENERGY

    PRADEEP|Exercise Very short Answer Question|21 Videos

  • WORK AND ENERGY

    PRADEEP|Exercise NCERT Questions|33 Videos

  • SOUND

    PRADEEP|Exercise Model Test (sec - B)|12 Videos

Similar Questions

Explore conceptually related problems

A man carries a suitcase on head by applying a force of 20 N . He travels a horizontal a distance of 10 m and then climbs a vertical distance of 5 m . Calculate the total work done by him .

A man of weight 60 kg f is carrying a load of 20 kg of on his head . He moves a distance of 25 m up an incline of 1 in 12 . Calculate the work done by him .

A man moves on a straight horizontal road with a block of mass 2 kg in his hand. If he covers a distance of 340 m with an acceleration of 0.5 m/s^2 find the work done by the man on the block during the motion.

A Body moves a distance of 10 m along a straight line under the action of a force of 5N.if the work done is 25 joules the angle which the force makes with the direction of motion of the body is

A body moving along a circular path with unifrom speed covers a distance of 20 m If the centripetal force acting on it is 10 N ,What is the work done by the force?

A person is holding a bucket by applying a force of 10 N. He moves a horizontal distance of 5 m and then climbs up a vertical distance of 10 m. Find the total work done him.

A perosn is holding a bucket by applying a force of 20N. He moves a horizontal distance of 15m first and then climbs up a distance of 12m. What is the total work done by him?

A gardener pushes a lawn roller on a rough surface. He applies a force of 150 N over a distance of 5 m. After he gets tired and his applied force reduces linerly with distance to 75 N. The total distance moved is 10 m. Plot the force applied by the gardencer and the frictional force, which is 75 N versus displacement. Calculate the work done by t he two forces over 10 m.

A car is moving on a circular road of diameter 50 m with a speed of 5 m/s. It is suddenly accelerated at a rate of 1 m//s^(2) . If the mass of he car is 500 kg, then the net force acting on the car is