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An electron emitter must have _____________ work function and ___________ melting point.
Concept: Concept of Work
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
Concept: Work Done by the Force of Gravity (W = mgh)
How is the unit horsepower related to the S.I. unit of power?
Concept: Work Done by the Force of Gravity (W = mgh)
State the energy changes in the following case while in use:
An electric iron
Concept: Transformation of Energy
State the energy changes in the following case while in use:
A ceiling fan
Concept: Transformation of Energy
Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity
Concept: Energy > Kinetic Energy (K)
Derive a relationship between S.I. and C.C.S. unit of work
Concept: Concept of Work
Derive a relationship between S.I. and C.C.S. unit of work
Concept: Concept of Work
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Concept: Concept of Work
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Concept: Concept of Work
Name the physical quantity measured in terms of horse power.
Concept: Forms of Energy
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
Concept: Energy > Kinetic Energy (K)
A body of mass 10 Kg is kept at a height of 5m. It is allowed to fall and reach the ground.
(i) What is the total mechanical energy possessed by the body at the height of 2m assuming it is a frictionless medium ?
(ii) What is the kinetic energy possessed by the body just before hitting the ground ? Take g = 10 m/s2.
Concept: Principle of Conservation of Energy
Concept: Power
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Concept: Forms of Energy
When the speed of a moving object is doubled, then its kenetic energy ______.
Concept: Energy > Kinetic Energy (K)
The energy conversion in a washing machine is from ______.
Concept: Transformation of Energy
What should be the angle between the direction of force and the direction of displacement, for work to be negative?
Concept: Measurement of Work
Name the physical quantity obtained using the formula `U/h`, where `U` is the potential energy and h is the height.
Concept: Types of Potential Energy
Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2)
Concept: Power
