A 10 kg object collides with stationary 5 kg object and after collision they stick together and move forward with velocity 4 ms-1. What is the velocity with which the 10 kg object hit the second one ?
4 ms-1
6 ms-1
10 ms-1
12 ms-1
When a force is applied on a moving body, its motion is retarded. Then the work done is
positive
negative
zero
positive and negative
Physical independence of force is a consequence of
third law of motion
second law of motion
first law of motion
all of these laws
The kinetic energy of a body becomes four times its initial value. The new momentum will be
same as the initial value
twice the initial value
thrice the initial value
half of its initial value
An ice cart of mass 60 kg rests on a horizontal snow patch with coefficient of static friction . Assuming that there is no vertical acceleration, find the magnitude of the maximum horizontal force required to move the ice cart. (g= 9.8 ms-2)
100 N
110 N
209 N
196 N
Moment of a couple is called
impulse
couple
torque
angular momentum
C.
torque
Moment of a couple is called torque.
A cyclist is moving in a circular track of radius 80 m with a velocity v = 36 km/h. He has to lean from the vertical approximately through an angle (Take g = 10 ms-2)
An athlete throws a discus from rest to a final angular velocity of 15 rad/s in 0.270 s before releasing it. During acceleration, discus moves a circular arc of radius 0.810 m. Acceleration of discus before it is released is
45
182
187
192
A motor is rotating at a constant angular velocity of 500 rpm. The angular displacement per second is
If the mass of moon is of earth's mass, its radius is of earth's radius and if g is acceleration due to gravity on earth, then the acceleration due to gravity on moon is