While travelling through earth's atmosphere, the velocity of a 42 kg meteorc is.reduced from `20 km//min` to `5 km//min`. Calculate the produced heat due to the change of velocity.

The velocity of a body of mass 5 kg changes from 20 m/s to 10 /s. calculate the change of momentum of the body.

The velocity of a 42 kg celestial body reduces from 20 km cdot "min"^(-1) to 5 km cdot "min"^(-1) due to its passage through the earth's atmosphere. Find out the heat produced in calorie. (J = 4.2 xx 10^(7) erg cdot cal^(-1))

An aeroplane is flying horizontally at a height of 2/3k m with a velocity of 15 km/h. Find the rate at which it is receding from a fixed point on the ground which it passed over 2 min ago.

A block having mass of 2 kg is pulled over a horizontal surface at a constant velocity of 20 km cdot h^(-1) . If the frictional coefficient is 0.5, calculate the amount of heat produced in 1 h. If 50% of the heat produced i absorbed by block, what will be the increase in its temperature? Specific heat of the body = 0.1 cal cdot g^(-1) cdot^(@)C^(-1) .

The speed of a 50 kg heavenly object reduces from 30 km cdot "min"^(-1) to 10 km cdot "min"^(-1) due to its passage through earth's atmosphere. Find out the heat generated in calorie, due to this change in speed. J = 4.2 xx 10^(7) erg .

An aeroplane is flying horizontally from west to east with a velocity of 900 km/h. Calculate the potential difference developed between the ends of its wings having a span of 20 m. The horizontal component of the Earth's magnetic field is 5xx10^(-4)T and the angle of dip is 30^(@) .