If the mechanical advantage of a simple machine is 4, then which of the following statements is true? A. The output force is 4 times the input force
B. The input force 4 times the output force
C. The resistance force is 4 times the effort work.
D. The efficiency is 4%

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.