Chapter 6 – Work, Energy and Power
A particle is released from a height S. At certain height its kinetic energy is three times its potential energy. The height and speed of particle at that instant are respectively.
28
Oct
A particle is released from a height S. At certain height its kinetic energy is three times its potential energy. The height and speed of particle at that instant are respectively. A particle is released from a height S. At certain height its kinetic energy is three times its potential energy. The height and speed [...]
A ball of mass m is dropped from a height h on a platform fixed at the top of a vertical spring as shown in figure. The platform is depressed by a distance x. The spring constant is (Take acceleration due to gravity =g):
28
Oct
A ball of mass m is dropped from a height h on a platform fixed at the top of a vertical spring as shown in figure. The platform is depressed by a distance x. The spring constant is (Take acceleration due to gravity =g): A particle of mass 'm' at rest is acted upon by [...]
A stone is projected vertically up to reach maximum height h. The ratio of its kinetic energy to its potential energy at a height 4/5h, will be
28
Oct
A stone is projected vertically up to reach maximum height h. The ratio of its kinetic energy to its potential energy at a height 4/5h, will be A stone is projected vertically up to reach maximum height h. The ratio of its kinetic energy to its potential energy at a height 4/5h will be October [...]
A stone of mass 2 kg is projected upwards with KE of 98 J. The height at which the KE of the body becomes half its original value, is given by (take, g=9.8ms^−2)
28
Oct
A stone of mass 2 kg is projected upwards with KE of 98 J. The height at which the KE of the body becomes half its original value, is given by (take, g=9.8ms^−2) A stone of mass 2 kg is projected upwards with KE of 98 J. The height at which the KE of the [...]
A body at mass 1 kg falls from rest through a distance of 200 m and acquires a speed of 50 m/s. Work done against friction of air is
28
Oct
A body at mass 1 kg falls from rest through a distance of 200 m and acquires a speed of 50 m/s. Work done against friction of air is A body at mass 1 kg falls from rest through a distance of 200 m and acquires a speed of 50 m/s. Work done against friction [...]
A2 g ball of glass is released from the edge of a hemispherical cup whose radius is 20 cm . What is the sped of the ball when its reaches the bottom of the cup?
28
Oct
A2 g ball of glass is released from the edge of a hemispherical cup whose radius is 20 cm . What is the sped of the ball when its reaches the bottom of the cup? A2 g ball of glass is released from the edge of a hemispherical cup whose radius is 20 cm . [...]
A particle us released from a height H. At certain height its kinetic energy is two times its potential energy. Height and speed of particle at that instant are
28
Oct
A particle us released from a height H. At certain height its kinetic energy is two times its potential energy. Height and speed of particle at that instant are A particle us released from a height H. At certain height its kinetic energy is two times its potential energy. Height and speed of particle at [...]
A girl in a swing is 2.5 m above ground at the maximum height and at 1.5 m above the ground at the lowest point. Her maximum velocity in the swing is (g=10ms^−2 )
28
Oct
A girl in a swing is 2.5 m above ground at the maximum height and at 1.5 m above the ground at the lowest point. Her maximum velocity in the swing is (g=10ms^−2 ) A girl in a swing is 2.5 m above ground at the maximum height and at 1.5 m above the ground [...]
A motor cyclist is trying to jump across a path as shown by driving horizontally off a cliff A at a speed of 5ms^−1. Ignore air resistance and take g=10ms^−2. The speed with which he touches the cliff B is:
28
Oct
A motor cyclist is trying to jump across a path as shown by driving horizontally off a cliff A at a speed of 5ms^−1. Ignore air resistance and take g=10ms^−2. The speed with which he touches the cliff B is: A particle of mass 'm' at rest is acted upon by a force 'p' for [...]
A massless platform is kept on a light elastic spring as shown in figure. When a small stone of mass 0.1 kg is dropped on the pan from a height of 0.24 m, the spring compresses by 0.01m. From what height should the stone be dropped to cause a compression of 0.04m in the spring ?
28
Oct
A massless platform is kept on a light elastic spring as shown in figure. When a small stone of mass 0.1 kg is dropped on the pan from a height of 0.24 m, the spring compresses by 0.01m. From what height should the stone be dropped to cause a compression of 0.04m in the spring [...]