Questions in Laws of Motion

Select	Question
	A rocket can go vertically upwards in earth's atmosphere because
	At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking $g = 10\,m/{s^2})$
	A jet engine works on the principle of
	The coefficient of friction $\mu$ and the angle of friction $\lambda$ are related as
	A force of 98 N is required to just start moving a body of mass 100 kg over ice. The coefficient of static friction is
	A block weighs W is held against a vertical wall by applying a horizontal force F. The minimum value of F needed to hold the block is
	The maximum static frictional force is
	Maximum value of static friction is called
	Pulling force making an angle $\theta $ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is $\alpha $, then the magnitude of force required to move the body is equal to
	In the figure shown, a block of weight 10 N resting on a horizontal surface. The coefficient of static friction between the block and the surface ${\mu _s} = 0.4$. A force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block, then the block will