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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 > Solar Energy
What is a solar cell?
Concept: Forms of Energy > Solar 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: Mechanical 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: Concept of Power
Concept: Concept of Work
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 > Solar Energy
When the speed of a moving object is doubled, then its kenetic energy ______.
Concept: Mechanical Energy > Kinetic Energy (K)
The energy conversion in a washing machine is from ______.
Concept: Conversion of Energies
What should be the angle between the direction of force and the direction of displacement, for work to be negative?
Concept: Measurement of Work
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: Concept of Power
A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:
- the work done by the engine.
- the power of the engine.
Concept: Mechanical Energy > Kinetic Energy (K)
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
Concept: Mechanical Energy > Kinetic Energy (K)
A force 'F' moves a load from A to C as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement?
Concept: Measurement of Work
Work done by this force at any instant is ______.
Concept: Concept of Work
For burning of coal in a thermoelectric station, the energy conversion taking place is:
Concept: Conversion of Energies
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
Concept: Mechanical Energy > Kinetic Energy (K)
Unit of power used in mechanical engineering is ______.
Concept: Concept of Power
