Q1. The volume of 50g of a substance is 20cm3 . If the denstiy of water is 1 g cm3, will the substance float or sink in water ? justify your answer ?
Q2. Show that the energy of a vibrating pendulum is conserved ?
Q3. A ball is dropped from a heigh of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?
define 1 watt of power?
define work , its formula with SI unit ?
Derive an expression for the gravitational potential energy of an object of mass 'm' at a height 'h' above the earth's surface.
define power. Give the SI unit of power
A stone projected vertically upward with a velocity 'u' reaches a maximum height 'h'. Find the ratio of kinetic energy and potential energy of the stone, when it is at height 3h/4 from the ground..?
1. Can a body have energy without momentum ????
2. Can a body have momentum without energy ?????
plzz ans. with explanation ???
Identify and state the type of transformation of energy in the following cases:
1. When coal is burnt.
2. When a dry cell discharges.
3. In a thermal power plant.
Can any object have momentum even if its mechanical energy is 0? explain.
What is the work done by a satellite moving around the earth ?Justify your answer.
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy
If the speed of a body is halved ,what will be the change in its kinetic energy??????????
plz answer
why iron nail sinks and cork float on water?
an electric heater is rated 1500w. how much energy does it use in 10 hrs.express your answer kwt and joules.
I am confused as to how to find K.E. in the Activity 11.15 at Page 155 of Work and Energy chapter because we don't know the velocity in those cases. Finding P.E. is easy there. Can anybody help???
Q1. The volume of 50g of a substance is 20cm3 . If the denstiy of water is 1 g cm3, will the substance float or sink in water ? justify your answer ?
Q2. Show that the energy of a vibrating pendulum is conserved ?
Q3. A ball is dropped from a heigh of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?
define 1 watt of power?
define work , its formula with SI unit ?
Derive an expression for the gravitational potential energy of an object of mass 'm' at a height 'h' above the earth's surface.
define power. Give the SI unit of power
A stone projected vertically upward with a velocity 'u' reaches a maximum height 'h'. Find the ratio of kinetic energy and potential energy of the stone, when it is at height 3h/4 from the ground..?
1. Can a body have energy without momentum ????
2. Can a body have momentum without energy ?????
plzz ans. with explanation ???
Identify and state the type of transformation of energy in the following cases:
1. When coal is burnt.
2. When a dry cell discharges.
3. In a thermal power plant.
Can any object have momentum even if its mechanical energy is 0? explain.
What is the work done by a satellite moving around the earth ?Justify your answer.
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy
If the speed of a body is halved ,what will be the change in its kinetic energy??????????
plz answer
why iron nail sinks and cork float on water?
an electric heater is rated 1500w. how much energy does it use in 10 hrs.express your answer kwt and joules.
I am confused as to how to find K.E. in the Activity 11.15 at Page 155 of Work and Energy chapter because we don't know the velocity in those cases. Finding P.E. is easy there. Can anybody help???