For a body moving in a circular path, the work done by the centripetal force is ___________

Assertion: When a body moves along a circular path, no work is done by the centripetal force. Reason: The centripetal force is used on moving the body along the circular path and hence no work is done.

A

Both assertion and reason are true and reason is the correct explanation of the assertion

B

Both assertion and reason are true but the reason is not the correct explanation of assertion

C

Assertion is true but reason is false

D

Both assertion and reason are false

The elastic potential energy of a body is
1. Work done by the external force against the deforming force.
2. Work done against the external force by the deforming force.
3. The sum of work done by the external force and the deforming force.
Which one option is true?

A

Only 1

B

1 and 3

C

1, 2 and 3

D

None of these

Three friends A, B and C worked together to complete the work. A takes 4 days more to complete same work done by A and B. Work done by C in 4 days is equal to the work done by A in one day. Work done by B in 3 days is equal to the work done by C in 8 days. Find the time in which work will be completed if all three worked together.

A

110/27 days

B

118/25 days

C

110/23 days

D

120/23 days

An object of mass m is traveling at constant speed v in a circular path of radius r. How much work is done by the centripetal force during one-half of a revolution?

A

?mv2

B

0

C

?mv2r

D

2?mv2r

Which of the following statements are comes for Network Critical Path? 1. The path of critical activities, which links the start and end events is critical path 2. It is the path of activities having zero float 3. It is the path of events having zero slack 4. The sum of the duration of the critical activities along a critical path gives the duration of the Project

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

1 and 4 only

D

2, 3 and 4 only

Consider the following statements – 1. In centrifugal force the reaction force is exerted on the other body by the moving body on a circular path. 2. Washing machine and butter extraction machine from milk works on centrifugal force. 3. Torque is a vector quantity, it’s unit is Newton Meter. Which of the above statements is/are correct?

A

Only 1

B

1 and 2

C

2 and 3

D

1, 2 and 3

If ‘v’ and ‘ω’ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius ‘r’, will be

A

r/v²

B

v²/r

C

r/ω²

D

ω²/r

If v and $$\omega $$ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius r, will be

A

$$\frac{{\text{r}}}{{{{\text{v}}^2}}}$$

B

$$\frac{{{{\text{v}}^2}}}{{\text{r}}}$$

C

$$\frac{{\text{r}}}{{{\omega ^2}}}$$

D

$$\frac{{{\omega ^2}}}{{\text{r}}}$$

E

$${\text{r}}\omega $$

In circular motion, the work done by the centripetal force on the body is-

A

Positive

B

Negative

C

Zero

D

Constant

A circular path of uniform width of area 500.5 m2 is made around a circular park of area 1386 m2. If a plant is planted after every 2m on both sides of the circular path, how many total numbers of plants are planted on the path?

A

119

B

121

C

137

D

143

For a body moving in a circular path, the work done by the centripetal force is ___________

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