Work, Energy and Power questions
712 published questions with worked solutions.
- The voltage clouds is 4 10^ 6 volt with respect to ground. In a lightening strike lasting 100 m sec, a charge of 4 coulomb is...
- Power in an A.C. circuit is rated per second at which
- Power in an A.C. circuit is rated per second at which
- If F = (60 i + 15 j - 3 k ) N and V = (2 i - 4 j + 5 k ) m/s , then instantaneous power is :
- If kinetic energy of a body is increased by 300% than percentage change in momentum will be
- A particle of mass m_1 is moving with a velocity v_1 and another particle of mass m_2 is moving with a velocity v_2. Both of them...
- A stone is tied to a string of length ' ' and is whirled in a vertical circle with the other end of the string as the centre. At...
- A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = 1 3 t^2,...
- 300 J of work is done in sliding a 2 kg block up an inclined plane of height 10m. Taking g = 10 m/s ^2, work done against...
- A vertical spring with force constant K is fixed on a table. A ball of mass m at a height h above the free upper end of the...
- A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity...
- A body of mass 1 kg is thrown upwards with a velocity 20 m/s . It momentarily comes to rest after attaining a height of 18 m ....
- An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s . The mass per...
- A source S_1 is producing 10^ 15 photons per second of wavelength 5000 . Another source S_2 is producing 1.02 10^ 15 photons per...
- The potential energy of a system increases if work is done :
- A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power...
- The potential energy of a particle in a force field is: U = A r^2 - B r , where A and B are positive constants and r is the...
- A uniform force of (3 i + j ) newton acts on a particle of mass 2 kg. Hence the particle is displaced from position (2 i + k )...
- A block of mass 10 kg, moving in x direction with a constant speed of 10 m s ^ -1 , is subjected to a retarding force F = 0.1x...
- Two similar springs P and Q have spring constants K_P and K_Q, such that K_P > K_Q. They are stretched, first by the same amount...
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