Average and Instaneous Power
Trending Questions
Q. coversion of 1 Mw power on a new system having basic unit mass , length and time as 10 kg , 1 dm and 1minute respectively is
Q.
A particle moves with a velocity →v=5^i−3^j+6^kms−1 under the influence of a constant force →F=10^i+10^j+20^kN . The instantaneous power applied to the particle is
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A particle of mass is moving in one dimension under a force that delivers a constant power to the particle. If the initial speed of the particle is zero, then the speed after is
Q. A body of mass m accelerates uniformly from rest to a speed v0 in time t0. The work done on the body till any time t is
Q. 65. A bullet of mass 10g leaves a riffle at an initial velocity of 1000m/s and strike the earth at the same level with a velocity of 500m/s.the work done in joules overcoming the resistance of air will be?
Q. A body whose mass is 2 kg initially at rest. A cons†an t force of 5 N acts on it for 10 seconds. Then the average power is?
Q. The velocity of a particle of mass 2 kg moving along x-axis is given by v=2\sqrt x (where v is in m/s and x is in m). The work done by the force acting on the particle during its motion from x=2 m to x4=m is
Q. 18. The work done required to stop a car of mass 1000kg moving at a velocity of 20m/s will be
Q. An automobile of mass m accelerates, starting from rest, with the engine supplying constant power 'P'. How the velocity of the automobile vary with time?
independent of 't'
Q. Q:- A car of mass 2000 kg travelling with a uniform velocity of 2m/s accelerates till its velocity becomes 22m/s. The work done on the car is- 1. 480 kJ 2. 48 k
Q. 4. Which of the following expressions has the same unit as power: A force x velocity B work x time C forcr x acceleration D force x distance WHY
Q. abody of mass 1 kg begins to move under theAction ofa time dependent force F (2ti +3t2jN, and j are unit vectors along x and yWhat power will be developed by the force at the time t
Q. 8. A body of mass 10 kg moves with a velocity of 2m per sec along a circular path of radius 8m. The power produced by the body will be?
Q. A particle of mass m moves on a straight line withits velocity varying with the distance travelled. If therelation between velocity and distance is v Kx (Kis constant), then find the work done by the forcesduring a displacement x 0 to x = d.VERYmkd2(1)2mk2d2(2)2mdok34)2mk^° d23)2
Q. Instantaneous power can be equal to average power.
- False
- True
Q. A block of mass m is located on a horizontal plane. The block acquires a horizontal velocity v0 due to friction. Find the mean power developed by the friction force during the motion of the body. The frictional cofficient is μ=0.3, m=2 kg and v0=5 m/s (Take g=10 m/s2)
- 30 watt
- 45 watt
- 60 watt
- 15 watt
Q. A particle of mass 0.01 kg and charge 10−6 C is placed at rest in a uniform electric field 2×106 N/C and then released. The kinetic energy attained by the particle after moving a distance of 2 m is
[Assume gravity free space]
[Assume gravity free space]
- 3 J
- 2 J
- 1 J
- 4 J
Q. If a force →F =(7 ^i−6 ^j+2 ^k) N and velocity →v=(6 ^i+^k) m/s, then the instantaneous power is
- 46 watts
- 42 watts
- 57 watts
- 44 watts
Q. Two blocks of masses m1 and m2 are connected by a spring of spring constant k. The block of mass m2 is given a sharp impulse so that it acquires a velocity v0 towards right. Find (a) the velocity of the centre of mass, (b) the maximum elongation that the spring will suffer.
Figure
Figure