How much height can a 60 kg mass climb by using energy from a slice of bread which produces 100,000cal ? Assume the efficiency of human body is 28%.

How much metres can a 50 kg man climbs by using the energy from a slice of a bread which produces 420 kJ heat? Assuming that the human body effciency working is 30% . Use g=10 m//s^(2) .

The weight of a person is 60 kg . If he gets 10 calories of heat through food and the efficiency of his body is 28% , then upto what height he can climb? Take g = 10m s^(-2)

A makki ki roti has 100 kcal of thermal energy. What a man of 60 kg eats five such roti, how many meters can he climb by using this energy. Given that the working efficiency of man is 30% of the total energy gain by eating.

The weight of a person is 60 kg . If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately)

If a slice of bread can supply 100 kilocalorie of heat to a man, how many metres can a man weighting 60kg climb by using this energy? (Efficiency of working of the human body =30% J =4.2 joules per calorie and g=9.8ms^(-2) )

An electric motor is used to lift an elevator and its load (total mass 1500kg) to a height of 20m. The time taken for the job is 20s. What work is done ? What is the rate at which work is done. If efficiency of the motor is 75% , at which rate is the energy supplied to the motor?

A feverish person is running a temperature of 101^@F and is given paracetamol to lower his temperature. Due to medicine, there is an increase in rate of evaporation of sweat from his body. The mass of the person is 50 kg and the specific heat of human body is approximately about 1 cal g^(-1) ""^@C^(-1) . If the fever is brought down to 98^@F in 25 mins, the average rate of extra evaporation caused by the medicine is R in g "min"^(-1) , then the value of 87R/100 is (Latent heat of water at that temperature=580 g/cal)

A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump, assuming its efficiency as 50% will be