During a rapid acceleration phase

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

During a rapid acceleration phase, the engine of a car performs mechanical work equal to

1500\,\text{kJ}

. (i) Convert this amount of work into kilowatt-hour. (ii) A household lamp is rated

60\,\text{W}

. If the lamp is kept on for

1\,\text{h}

, how many such lamps could be powered by the work done by the car engine? (iii) Express

1500\,\text{kJ}

in the CGS unit of energy (erg). (iv) Express the same energy in nutritional calories (

1\,\text{kcal} = 4.186\,\text{kJ}