A cube on a smooth horizontal surface___________________?
(A) cannot be in stable equilibrium
(B) cannot be in neutral equilibrium
(C) cannot be in unstable equilibrium
(D) can be in any of these states
When two forces, each equal to P, act at 90° to each other, then the resultant will be_____________?
(A) P
(B) PV2
(C) P/V2
(D) 2P
A rod AB carries three loads of 30 N, 70 N and 100 N at distances of 20 mm, 90 mm and 150 mm respectively from A. Neglecting the weight of the rod, the point at which the rod will balance is_______________?
(A) 109.5 mm from A
(B) 119.5 mm from A
(C) 125.5 mm from A
(D) 132.5 mm from A
If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is___________________?
(A) proportional to A
(B) proportional to A2
(C) proportional to 1/A2
(D) independent of A
A stone is thrown up a slope of inclination 60° to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection ?
(A) 15°
(B) 30°
(C) 45°
(D) 75°
If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are___________________?
(A) 0 and 5 m/sec
(B) 5 m/sec and 0
(C) 5 V3 m/sec and 0
(D) 5 and 5V3 m/sec
A projectile has maximum range of 40 m on a horizontal plane. If angle of projection is a and the time of flight is 1 second, then sin a must be about__________________?
(A) 1/4
(B) 1/3
(C) 1/2
(D) 1/5
The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is__________________?
(A) 98 m
(B) 490 m
(C) 980 m
(D) 1960 m
For a given velocity of a projectile, the range is maximum when the angle of projection is___________________?
(A) 30°
(B) 45°
(C) 90°
(D) 0°
When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are________________?
(A) straight line and parabola
(B) straight line and circle
(C) circle and straight line
(D) circle and parabola