HARD
JEE Advanced
IMPORTANT
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A pump motor is used to deliver water at a certain rate from a given pipe. To obtain times water from the same pipe in the same time, by what amount should the power of the motor be increased?
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Important Questions on Work, Energy and Power
MEDIUM
JEE Advanced
IMPORTANT
The speed reached by a car of mass in travelling a distance , driven with constant power , is given by
MEDIUM
JEE Advanced
IMPORTANT
Power supplied to a particle of mass varies with time as . Here is in second. If the velocity of particle at is the velocity of particle at time will be
HARD
JEE Advanced
IMPORTANT
A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time is proportional to
MEDIUM
JEE Advanced
IMPORTANT
A car drives along a straight level frictionless road by an engine delivering constant power. Then velocity is directly proportional to
HARD
JEE Advanced
IMPORTANT
A projectile is fired with some velocity making certain angle with the horizontal. Which of the following graphs is the best representation for the kinetic energy of a projectile versus its horizontal displacement ?
MEDIUM
JEE Advanced
IMPORTANT
An object of mass slides down a hill of arbitrary shape and after travelling a certain horizontal path stops because of friction. The total vertical height descended is . The friction coefficient is different for different segments for the entire path but is independent of the velocity and direction of motion. The work that a tangential force must perform to return the object to its initial position along the same path is
EASY
JEE Advanced
IMPORTANT
A toy gun uses a spring of force constant . Before being triggered in the upward direction, the spring is compressed by a distance . If the mass of the shot is , on being triggered, it will go up to a maximum height of
MEDIUM
JEE Advanced
IMPORTANT
A block of mass starts at rest and slides a distance down a friction less incline (angle ) where it runs into a spring of negligible mass. The block slides an additional before it is brought to rest momentarily by compressing the spring. The force constant of the spring is . The value of is (take )
