Chapter 6 – Work, Energy and Power
A small block of mass 2kg is kept on a rough inclined surface of inclination θ=30^∘ fixed in a lift. The lift goes up with a uniform speed of 1ms^−1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2s is
28
Oct
A small block of mass 2kg is kept on a rough inclined surface of inclination θ=30^∘ fixed in a lift. The lift goes up with a uniform speed of 1ms^−1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time [...]
A mass M is lowered with the help of a string by a distance h at a constant acceleration g/2. The work done by the string will be:
28
Oct
A mass M is lowered with the help of a string by a distance h at a constant acceleration g/2. The work done by the string will be: A mass M is lowered with the help of a string by a distance h at a constant acceleration g/2. The work done by the string will [...]
A particle moves along the X-axis from x=0 to x=3 m under the influence of a force given by F= 3x^2 – 2x. Calculate the work done by this force.
28
Oct
A particle moves along the X-axis from x=0 to x=3 m under the influence of a force given by F= 3x^2 – 2x. Calculate the work done by this force. A particle moves along the X-axis from x=0 to x=3 m under the influence of a force given by F= 3x^2 - 2x. Calculate the [...]
A force of F→=2xiˆ+2jˆ+3z^2kˆN is acting on a particle. Find the work done by this force in displacing the body from (1,2,3)m to (3,6,1)m.
28
Oct
A force of F→=2xiˆ+2jˆ+3z^2kˆN is acting on a particle. Find the work done by this force in displacing the body from (1,2,3)m to (3,6,1)m. 1)m. 2 3)m to (3 6 A force of F→=2xiˆ+2jˆ+3z^2kˆN is acting on a particle. Find the work done by this force in displacing the body from (1 October 28, 2020 [...]
A ball is released from the top of a tower. Find the ratio of work done by force of gravity in first, second and third second of the motion of the ball is
28
Oct
A ball is released from the top of a tower. Find the ratio of work done by force of gravity in first, second and third second of the motion of the ball is A ball is released from the top of a tower. Find the ratio of work done by force of gravity in first [...]
Figure shows four situations in which a force is applied to a block. In all four cases, the force has the same magnitude, and the displacement of the block is to the right and of the same magnitude. Arrange the work done in the given situation in descending order.
28
Oct
Figure shows four situations in which a force is applied to a block. In all four cases, the force has the same magnitude, and the displacement of the block is to the right and of the same magnitude. Arrange the work done in the given situation in descending order. and the displacement of the block [...]
A 500 kg car, moving with a velocity of 36 km h^−1 on a straight road unidirectionally, doubles its velocity in 1 min. The average power delivered by the engine for doubling the velocity is
28
Oct
A 500 kg car, moving with a velocity of 36 km h^−1 on a straight road unidirectionally, doubles its velocity in 1 min. The average power delivered by the engine for doubling the velocity is A 500 kg car doubles its velocity in 1 min. The average power delivered by the engine for doubling the [...]
The height if the dam, in a hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water (in kg) that must fall per second on the blades of the turbines is
28
Oct
The height if the dam, in a hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water (in kg) that must fall per second on the blades of the turbines is in a hydroelectric power station is 10 m. In order to generate 1 MW of [...]
A force F acting on a body depends on its displacement S as F∝S^1/3 . The power delivered by F will depend on displacement as:
28
Oct
A force F acting on a body depends on its displacement S as F∝S^1/3 . The power delivered by F will depend on displacement as: A force F acting on a body depends on its displacement S as F∝S^1/3 . The power delivered by F will depend on displacement as: October 28, 2020 Category: Chapter [...]
A train weighting 10^7 N is running on a level track with uniform speed of 36 km/h. The frictional force is 0.5 kg f per quintal. What is the power of the engine? g = 10 m/s^2
28
Oct
A train weighting 10^7 N is running on a level track with uniform speed of 36 km/h. The frictional force is 0.5 kg f per quintal. What is the power of the engine? g = 10 m/s^2 A train weighting 10^7 N is running on a level track with uniform speed of 36 km/h. The [...]