In which of the following cases the net ...

In which of the following cases the net force is zero?

A

A drop of rain falling down with terminal velocity

B

A cork of mass 10 g floating on water

C

A car moving with constant speed of 30 `km//hr` on a rough road

D

A charged particle moving parallel to the magnetic field

Text Solution

Verified by Experts

The correct Answer is:

A, B, C, D

If `a=0`

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In which of the following cases the net force acting on the body is not zero?

A

A drop of rain falling down with a constant speed.

B

A cork of mass 10g floating on the surface of water.

C

A car moving with a contant speed of `20kmh^(-1)` on a rough road.

D

A pebble of mass `0.05kg` is thrown vertically upwards.

In which of the following cases frictional force is impulsive

A

B

C

D

All of these

In which of the following cases the electric field at the centre is not zero ?

A

B

C

D

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