
A jet engine works on the principle of
conservation of mass
conservation of energy
conservation of linear momentum

Important Questions on Newton's Laws of Motion
A block of mass slides with velocity on a frictionless horizontal surface and collides with a uniform vertical rod and sticks to it as shown. The rod is pivoted about and swings as a result of the collision making angle before momentarily coming to rest. if the rod has mass and length the value of is approximately




A jeweler is holding a gold chain of uniform mass per unit length hanging vertically just above a weighing scale as shown in the figure. He offers to charge the customer for half of the maximum reading of the scale, after he releases the chain. What percentage more than the actual price does the customer pay if he agrees to the offer?



A ball of mass moving with a velocity along -axis, hits another ball of mass which is at rest. After the collision, the first ball comes to rest and the second one disintegrates into two equal pieces. One of the pieces starts moving along -axis at a speed of . The second piece starts moving at a speed of at an angle (degree) with respect to the -axis. The configuration of pieces after the collision is shown in the figure. The value of (in degrees) to the nearest integer is _________.








A ball of mass moving with a velocity along the -axis, hits another ball of mass which is at rest. After the collision, first ball comes to rest while the second ball disintegrates into two equal pieces. One piece starts moving along -axis with a speed of The second piece starts moving at an angle of with respect to the -axis. The velocity of the ball moving at with -axis is The configuration of pieces after the collision is shown in the figure below. The value of to the nearest integer is





