Answer the following questions about the physical quantity "power".
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Answer the following questions about the physical quantity "power".
(a) State the definition of power and write its SI unit.
(b) Using the definition, obtain an expression that connects work done, power and time.
(c) A carpenter needs to do 3000J of work while driving nails. Explain, without detailed calculation, whether choosing a hammer that allows him to deliver twice the power will halve the time required. Support your explanation with a short numerical illustration using convenient values.