Chapter 8 – Work, Energy and Power

A ball dropped from a height of 2m rebounds to a height of 1.5m after hitting the ground. Then the % of energy lost is A ball dropped from a height of 2m rebounds to a height of 1.5m after hitting the ground. Then the % of energy lost is October 21, 2020 Category: Cengage [...]

A bullet, moving with a speed of 150(m)/(s), strikes a wooden plank. After passing through the plank, its speed becomes 125(m)/(s). Another bullet of the same mass and size strikes the plank with a speed of 90(m)/(s). Its speed after passing through the plank would be A bullet its speed becomes 125(m)/(s). Another bullet of [...]

A ball is thrown vertically upward with speed 10m/s and it returns to the ground with speed 8m/s. There exists a constant air resistance. The minimum height attained by the ball will be A ball is thrown vertically upward with speed 10m/s and it returns to the ground with speed 8m/s. There exists a constant [...]

A body dropped from a height H reaches the ground with a speed of 1.2 gH−−−√. Calculate the work done by air friction. A body dropped from a height H reaches the ground with a speed of 1.2 gH−−−√. Calculate the work done by air friction. October 21, 2020 Category: Cengage NEET by C.P Singh [...]

A body of mass 1kg is thrown upwards with a velocity 20ms^−1. It momentarily comes to rest after attaining a height of 18m. How much energy is lost due to air friction? (g=10ms^−2) A body of mass 1kg is thrown upwards with a velocity 20ms^−1. It momentarily comes to rest after attaining a height of [...]

A small block of mass m is kept on rough inclined surface of inclination θ fixed in an elevator. The elevator goes up with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be Work done [...]

A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. If kinetic energy of the block increases by 20J in 1s. Then: Work done from d = 0 m to d = 3 m October [...]

Consider the situation shown in figure. Initially the spring is unstretched when the system is released from rest. Assuming no friction in the pulley, the maximum elongation of the spring is Consider the situation shown in figure. Initially the spring is unstretched when the system is released from rest. Assuming no friction in the pulley [...]

A block of mass m is attached to two unstretched springs of spring constant k₁ each as shown . The block is displaced towards right through a distance of x and released. Find the speed of the block as it passes through the mean position will be Work done from d = 0 m to [...]

A mass of 0.5 kg moving with a speed of 1.5 ms^−1 on a horizontal smooth surface, collides with a massless spring of force constant k = 50Nm^−1.The maximum compression of the spring would be A mass of 0.5 kg moving with a speed of 1.5 ms^−1 on a horizontal smooth surface collides with a [...]