In which situation is no work being done A person carrying a box from one place to another a person picking up a box from the ground

A person picking up a box from the ground

Explanation:

Work is defined as measure of energy transfer that occurs when an object is moved from one place to another by an external force at least part of which is applied in the direction of the displacement. Basically, work implies activity whether an activity done by body, of mind, of a machine, or of a natural force. In picking up a box from the ground there is no movement of person from one palce to another, hence no work done by him. Work is done only when he picks the box and moves from one point to another while carrying it.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27