Four person K, L, M, N are initially at the four corners of a square of side d. Each person now moves with a uniform speed v in such a way that K always moves directly towards L, L directly towards M, M directly towards N, and N directly towards K. The four person will meet at a time _____________.
Answer
(A)
$$d / v$$
2
A projectile fired from the ground follows a parabolic path. The speed of the projectile is minimum at the top of its path.
Answer
(A)
TRUE
3
A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block is _________ newtons.
Answer
(C)
5
4
A simple pendulum with a bob of mass m swings with an angular amplitude of $$40^\circ $$. When its angular displacement is $$20^\circ $$, the tension in the string is greater than mg cos$$20^\circ $$.
Answer
(A)
TRUE
5
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in the time t is proportional to
