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Work done by a constant ..



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Q1. The force as a function of displacement of a moving object is presented by the graph. How much work is done when the object moves from 0 m to 8 m?

(a) 40 J
(b) 38 J
(c) 40 J
(d) 50 J

Q2. A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force?

(a) 400 J
(b) -400 J
(c) zero
(d) 50 J

Q3. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the external force?

(a) 400 J
(b) -400 J
(c) . zero
(d) . 50 J

Q4. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force?

(a) 400 J
(b) -400 J
(c) zero
(d) . 50 J

Q5. A construction worker holds a heavy tool box. How much work is done by the worker?

(a) FGd
(b) - FGd
(c) mgh
(d) zero

Q6. A spacecraft moves around Earth in a circular orbit with a constant radius. How much work is done by the gravitational force on the spacecraft during one revolution?

(a) FGd
(b) - FGd
(c) . mgh
(d) zero

Q7. A truck driver is trying to push a loaded truck with an applied force. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

(a) Fd
(b) –Fd
(c) zero
(d) none of these

Q8. A block of mass m is moved over a distance d. An applied force F is opposite to the block’s displacement. How much work is done on the block by the force F?

(a) mFd
(b) zero
(c) Fd
(d) –Fd

Q9. A block of mass m is moved over a distance d. An applied force F is directed perpendicularly to the block’s displacement. How much work is done on the block by the force F?

(a) mFd
(b) zero
(c) Fd
(d) –Fd

Q10. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement. How much work is done on the block by the force F?

(a) mFd
(b) zero
(c) Fd
(d) –Fd


0 votes
0 Answer
734 views

A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

Modified 229 Year Ago

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734
229 Year Ago

A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

0 votes
0 Answer
713 views

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

Modified 12 Year Ago

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713
12 Year Ago

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

0 votes
0 Answer
674 views

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

Modified 12 Year Ago

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674
12 Year Ago

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

0 votes
0 Answer
496 views

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

Modified 199 Year Ago

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496
199 Year Ago

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

0 votes
0 Answer
495 views

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

Modified 229 Year Ago Reya

495
Reya
229 Year Ago

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

0 votes
0 Answer
468 views

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

Modified 229 Year Ago

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468
229 Year Ago

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

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