Question

Spanish:

¿cuál de las siguientes NO es una unidad correcta para el trabajo realizado?

a) Pies * Libras

b) Vatios

c) Newton * Metro

d) Julios

English:

Which of the following is NOT a correct unit for the work done?

a) Feet * Pounds

b) Watts

c) Newton * Metro

d) Joules

Answer 1

Answer (a) Feet Pound  

Feet Pound is not the unit of work done

Because

Workdone is defined as product of force and displacement

Option (b) Watt second = Power x time = work done Hence it is correct unit of work done

Option (c) Newton meter = force x displacement because Newton is unit of force and meter is unit of displacement

Option (d) Joule is correct unit of work done

Hence Option (a) Feet Pound is not unit of work done as feet is distance unit and Pound is unit of mass not the unit of force in FPS system