NEET Physics Questions: Work Energy And Power

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A car travelling at a speed of 30 km/h is brought to a halt in 8 metres by applying brakes. If the same car is travelling at 60 km/h it can be brought to a halt with the same breaking power in




Here distance $ d \alpha \nu^2 $ as $ \nu $ is doubled, d becomes 4 times.
An engine pumps water continuously through a hose water leares the hose with a velocity V and m is the mass per unit length of the water Jet what is the rate at which kinetic energy is imperted to water.




No explanation available.
How much is the work done in pulling up a block of wood weighing 2KN for a length of 10m on a smooth plane inclined at an angle of 30o with the horizontal ?




$ W = Fd cos \theta $
A force of 7N, making an angle $ \theta $ with the horizantal, acting on an object displaces it by 0.5m along the horizontal direction. If the object gains K.E. of 2J, what is the horizontal component of the force ?




$ \triangle K = Fd cos \theta = w $
A 60 kg JATAN with 10 kg load on his head climbs 25 steps of 0.20m height each. what is the work done in climbing ? $ (g = 10 m/s^2) $




$ W = Fd = (mg) (d) ; where M = m_1 +m_2 $
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A ball of mass 5 kg is stiding on a plane with intial velocity of 10 m/s. If co- efficient of friction between surface and ball is 1/2 then before stopping it will describe...... $ (g = 10 m/s^ 2) $




$ a = \mu g and v^2 = v_0^2 = -2 \mu gd $ $ \therefore d = { vo^2 \over 2 \mu g } $ (v = 0)
The force constant of a wire is K and that of the another wire is 3k when both the wires are stretched through same distance, if work done are $W_1 and W_2,$ then...




According $ W = { 1 \over 2 } kx^2 $
A ball is released from the top of a tower. what is the ratio of work done by force of gravity in first, second and third second of the motion of the ball ? $ [ h_n \alpha (2n-1) ] $




$ h_n \alpha (2n-1) $
A spring of spring constant $ 10 ^3 n/m $ is stretched initially 4cm from the unstretched position. How much the work required to stretched it further by another 5 cm ?




$ W = { 1 \over 2} k ( x_2 ^2 -x_1^2 ) $
The mass of a car is 1000 kg. How much work is required to be done on it to make it move with a speed of 36 km/h ?




According to work energy theorm $ W = \triangle k $
A body of mass 6 kg is under a force, which causes a displacement in it given by $ S = { 2 t^3 \over 3} $ (in m). Find the work done by the force in first one seconds.




$ s = { 2t^3 \over 3 } \Rightarrow acceleration a = { d^2 s \over dt^2 } =4t , work W = \int_0^l F ds = \int_0^l mads $
A spring gun of spring constant $ 90 \times 10^2 N / M $ is compressed 4cm by a ball of mass 16g. If the trigger is pulled, calculate the velocity of the ball.




Loss in P.E. of spring = gain in K.E. of ball
A uniform chain of length 2m is kept on a table such that a length of 50cm hangs freely from the edge of the table. The total mass of the chain is 5kg. What is the work done in pulling the entire chain on the table. $(g = 10 m\s^2)$




$ w = { mgl \over 2n^2 }$ where n is, fraction of length of the chain hanging from the table.
A uniform chain of length L ans mass M is lying on a smooth table and one third of its is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is




$ w = { mgl \over 2n^2 }$ (n=3 given)
A block of mass 5 kg is resting on a smooth surface. At what angle a force of 20N be acted on the body so that it will acquired a kinetic energy of 40J after moving 4m




$ Fd cos \theta = { 1 \over 2} mv^2 - {1 \over 2} mu^2 $