name such a machine which converts muscular energy into mechanical energy

Liver

what is the relation between kilowatt hour and joule

1 KWh = 3.6×10^6

mention mutual relation among power energy and time

Power = Energy/Time

write in watt - 1 horsepower and 1 kilowatt

 1 horsepower equal to 746 watt
1 Kilo Watt = 1000 W

what is the relation between one horsepower and a watt

1 Horse Power = 746 Watt

how many watts are there in a horsepower HP

746 Watt

What is the SI unit of power

Watt

define average power

 the ratio between Total energy used and total time taken is called as average power

define 1 watt of power

 the power which work 1 the power which work one joule in one second is called as one watt.
1 Watt = 1joule/second

What is power

 rate of work or rate of transformation of energy is called as power

which energy is needed for photosynthesis

 solar energy

which component of solar light provide maximum energy to heat water

Infrared radiation

name the device which converts electrical energy into mechanical energy

Electric motor

which type of energy is there in a stone placed at a height from the Earth level

Potential energy

name main source of energy

 Sun

mention two types of mechanical energy

1.  potential energy
2. Kinetic energy

what are those two factors on which kinetic energy depends

Mass and velocity

why do our palms become hot when Me rubbed together

 kinetic energy of palms is transformed into heat energy

when we climb the stair which energy do we are

 energy of muscles

what will be the change in kinetic energy if the velocity is tripled

9 times