Advertisements
Advertisements
प्रश्न
Name the energy transfers which occur when :
an electric ball rings
Advertisements
उत्तर
An electric bell converts electrical energy to sound energy.
APPEARS IN
संबंधित प्रश्न
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What kind of energy is possessed by the following?
A stretched rubber band _____________
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same :
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
Name the energy transfers which occur when : there is a picture on a television screen
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
When an object falls freely towards the earth, then its total energy :
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
