A petrol engine consumes 5kg of petrol per hour. if the power of the engine is 20kw and the calorific value of petrol is 11×103kcal per kg . calculate the efficiency of the engine

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.