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प्रश्न
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
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उत्तर
The sum of the potential and kinetic energies of a body is called mechanical energy.
संबंधित प्रश्न
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
A pendulum is oscillating on either side of its rest position. The correct statement is:
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
State whether the object possess kinetic energy, potential energy, or both :
A ceiling fan in the off position ______________
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
A ball of mass 0.5 kg slows down from a speed of 5 m/s so that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
A bulb lights up when connected to a battery. State the energy change which takes place :
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
What is the meaning of the symbol kWh? What quantity does it represent?
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
Which of the following energy change involves frictional force?
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
