(A) Moving away from the earth
(B) moving towards the earth
(C) stationary
(D) revolving around the planet
Progressive waves of frequency 300 Hz are superimposed to produce a system of stationary waves in which adjacent crests are 1.5 m apart. What is the speed of the progressive waves?
(A) 100 m/s
(B) 450 m/s
(C) 200 m/s
(D) 900 m/s
The rate of change of angular momentum of a body is:
(A) the applied force
(B) the momentum of inertia
(C) the applied torque
(D) impulsive force
What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value, the mass remanding constant:
(A) 12
(B) 6
(C) 3
(D) 2
A man mass 100 kg is standing in an elevator. The net force man when elevator is going up with acceleration of 4 ms-2 would be:
(A) 908 N
(B) 490 N
(C) 100 N
(D) 1380 N
The angular speed of the minute hand of the clock in degrees per second is:
(A) 1.0
(B) 0.1
(C) 0.001
(D) none of these
A point on the rim of wheel moves 0.2 m when the wheel turns through an angle of 0.25 rad. The radius of wheel is:
(A) 0.65 m
(B) 0.125 m
(C) 0.8 m
(D) 0.34 m
A car of mass 1000 kg moves on a circular road with a speed of 20ms-1. Its direction changes by 90o after traveling 628 m on the road. The centripetal force acting on the car is:
(A) 500 N
(B) 750 N
(C) 1000 N
(D) 1500 N