1. A electric kettle, rate at 1.5kW, heats 1.1 kg of water from 14deg Celsius to 99deg Celsius in 4 min 45 s. Determine the efficiency of this application of an energy transformation technology? 2.2....

1. A electric kettle, rate at 1.5kW, heats 1.1 kg of water from 14deg Celsius to 99deg Celsius in 4 min 45 s. Determine the efficiency of this application of an energy transformation technology?
2.2. A high-rise window washer (mass 72 kg) is standing on a platform (mass 178 kg) suspended on the side of a building. An electric motor does 1.5 × 103 J of work on the platform and the worker to raise them to the top floor. The electrical energy required to operate the motor for this task is 1.6 × 105 J. (a) How high is the platform lifted? (b) Calculate the efficiency of the electric motor.