1.

A large household air conditioner may consume 23.7kW of power. What is the cost of operating this air conditioner for 3 h per day for 34 days if the cost of electricity is $0.198 per kW.h? dollarsa) What is the average power consumption in watts of an appliance that uses 7 k W.h of energy per day? W b) How many joules of energy does this appliance consume in a year?a} How long will it take a 546kg car with a useful power output 014% hp (1 hp : 746 W) to reach a speed of 14 m/s, neglecting friction? s b) How long Will this acceleration take if the car also climbs a 8-mhigh hill in the process? a) How much gravitational potential energy (relative to the ground on which it is built) is stored in the Great Pyramid of Cheops, given that its mass is about 7.00 x 109 kg and its centre of mass is 25 m above the surrounding ground? 4 b) Determine the ratio of this energy to the energy equivalent of the daily food intake of a person. (1.2 x 107 J)