the answer is B. hope i helped
Answer
1400 * 0.8 = 1,120
the useful energy output is 1,120 joules
True, an object at rest stays and rest and an object in motion stays in motion
Answer:

Explanation:
Given data
Coefficient of performance of a residential heat pump=1.6
Electrical power P=4kW
Required
Heat Q
Solution
The rate of heat produced is given as

Substitute the given values
So