Recent questions tagged unit4

Due to the application of a force body of mass 1.5 kg is moving up vertically with an acceleration of $1.2 m/s^2$ for $10 \;s$, starting from rest, What is power of the agent doing work?

asked Jul 22, 2013 by meena.p

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A bucket of water weighing 20 kg is slowly raised from depth of 20 m to ground level by a roap. The mass of rope is 1.2 kg per meter. Find the work done

asked Jul 22, 2013 by meena.p

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An engine of weight 6.5 metric ton is going up an incline of $\large\frac{5}{13}$ at the rate of $9\; km/hr$ .The power of engine , if co-efficient of friction is $\large\frac{1}{12}$ is

asked Jul 22, 2013 by meena.p

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A man throws the brick to a height of 12 m with a speed of 12 m/s. If he throws the brick in such a way that they just reach that height , what percentage of energy will be saved

asked Jul 20, 2013 by meena.p

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Ice cube of size $100\;cm$ and area of base $(500 m \times 50 m)$ is floating in a tank partially filled with water. The change in gravitational potential energy, when ice melts completely (density of Ice is $900\;kg/m^3$)

asked Jul 19, 2013 by meena.p

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Power supplied to a particle of mass 2 kg varies with time is $P=\large\frac{3t^2}{2}$ watt, velocity of particle at $t=0$ is $v=0.$ The velocity of particle at $t=2s$ will be

asked Jul 19, 2013 by meena.p

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A particle of mass m is projected with velocity u at an angle $\alpha$ with horizontal. During the period when particle decends from highest point to the position where its velocity vector makes $\alpha/2$ angle with horizontal, work done by gravity force is

asked Jul 19, 2013 by meena.p

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A particle is given an initial speed u inside a smooth spherical shell of radius $R=1m$ that it is just able to complete the circle. Acceleration of the particle when its velocity is vertical is

asked Jul 19, 2013 by meena.p

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A bullet fired from rifle. The ratio of kinetic energy of rifle to that of bullet after firing is

asked Jul 19, 2013 by meena.p

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A Block of mass 'm' are kept on a smooth horizontal plane, and attached to two unstretched spring with spring constants $k_1$ and $k_2$ as shown. If the block be displaced by a distance x on either side and released then the velocity of block as it passes through the mean position is

asked Jul 19, 2013 by meena.p

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A car of mass m moving at a speed v is stopped in distance x by friction between tyres and road. If kinetic energy of the car is doubled. its stopping distance will be

asked Jul 19, 2013 by meena.p

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Hail storms are observed to strike the surface of frozen lake at $30^{\circ }$ with the vertical and rebound at $60^{\circ}$ with vertical, Assume contact to be smooth, the coefficient of restitution,

asked Jul 19, 2013 by meena.p

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A fire hose has a diameter of 2.5 cm and is required to direct jet of water to height of at least 40 m. The minimum power of pump needed is

asked Jul 18, 2013 by meena.p

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Two blocks are resting on a floor as shown. There is no friction between floor and lower block (M=3 kg) but frictional coefficient between both blocks is 0.2. Both blocks move together with initial speed V towards the spring ,compresses it and due to force exerted by spring moves in reverse direction of initial motion. What is maximum value of V in (m/s), so that during motion there is no slipping between the blocks.

asked Jul 18, 2013 by meena.p

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A heavy particle hanging from fixed point by light inextensible string of length l is projected horizontally with speed $\sqrt {gl}$. Find speed of particle at the instant of the motion when tension in the string is equal to weight of particle

asked Jul 18, 2013 by meena.p

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In the arrangement shown mass m is released from rest with the spring unstretched . The force constant of spring is K. The maximum extension in the spring

asked Jul 18, 2013 by meena.p

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A pigeon in flight experiences a force of air resistance given by $F=bv^2$, where v is the flight speed and b is constant. What is maximum speed of pigeon if its power output is P

asked Jul 18, 2013 by meena.p

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In the figure shown, a particle is released from the position A on a smooth track. When particle reaches B, the normal reaction on it by the track is

asked Jul 18, 2013 by meena.p

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