A petrol engine consumes 10 kg of petrol in 1 hour. the calorific value of petrol is 11.4×10³ cal/gm .the power of the engine is 20kwatts. calulate the efficiency of engine

Agroup of monkeys is trying to cross the river in a rowboat. the maximum buoyant force on the rowboat is 2,000 n. the weight of the rowboat is 1,000 n. each monkey has a weight of 150 n. how many monkeys can safely cross in the rowboat at one time? explain your reasoning, including any calculations you used to find the answer.