Amicrowave oven has a power requirement of 1238 w. a frozen dinner requires 6.9 minutes to heat on full power. (a) how much electrical energy in (kwh) is used?
(b) if the cost of electricity is 12 cents per kwh, how much does it cost to heat the dinner?

(a) 142.37 kWh (b) 1708.44 cents

Explanation:

It is given that the microwave has a power requirement of 1238 W

The frozen dinner takes 6.9 minutes to heat

So time t =6.9 minutes

(a) The total energy used = power ×time = 1238×0.115=142.37 kWh

(B) The cost of the electricity is 12 cents per kWh

So total cost = 12×142.37=1708.44 cents

asthenosphere and convection

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.