A body of mass 0.1 kg attains a velocity of 10 m/s in 0.1s.The force acting on them is:
10 N
0.001 N
0.01 N
1000 N
Two blocks P and Q are released at the top of a rough inclined plane so that P slides along the plane and Q falls down freely. Which will have higher velocity on reaching the ground?
P
Q
Both will reach the ground with same velocity
It depends on the coefficient of friction
A particle of mass m has momentum p.Its kinetic energy will be
mp
A particle moves along a straight line such that its displacement at any time t is given by The velocity when the acceleration is zero, is
3 ms-1
-12 ms-1
42 ms-1
-9 ms-1
A body is at rest on the surface of the earth. Which of the following statement is correct?
No free is acting on the body
Only weight of the body acts on it.
Net downward force is equal to the net upward force.
None of the above statement is correct
When the force and displacement are perpendicular to each other, the work done is
Positive
negative
Zero
maximum
The rate of doing work is called
Power
impulse
torque
momentum
An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?
13 x 103 m
15.2 x 103 m
13.6 x 103 m
None of these
If the unit of force and length are increased by four times, then the unit of energy is increased by
2 times
4 times
8 times
16 times
A car moves a distance of 200 m.It covers the first-half of the distance at speed 40 km/h and the second-half of distance at speed v.The average speed is 48 km/h.Find the value of v ?
56 km/h
60 km/h
50 km/h
48 km/h