| Quiz | Power |
|---|---|
| Name | |
| Result | FAILED |
| Score | 2 / 8 (25%) |
| Passing score | 6.4 |
| Quiz took | 17 sec |
| Quiz finished at | 2021-10-28 12:27:55 |
A kettle transfers 2000 J of energy in 400 seconds. Calculate the power of the energy transfer.
Given 120 kJ of energy, how many minutes can a 250 W machine work for?
A crane lifts a 240 kg mass from ground to a height of 40m during a period of 2 minutes. Assuming that the work done is the same as the change in the gravitational potential energy store, calculate the power from the crane. (g = 9.8 N/kg)
Calculate the work done, when a 3 kW heater is running for 5 minutes.
Calculate the work done, when a 2 kW heater is running for 10 minutes.
An oven transfers 30 kJ of energy in 20 minutes. Calculate the power of the energy transfer.
An iron transfers 3 kJ of energy in 5 minutes. Calculate the power of the energy transfer.
Given 7200 kJ of energy, how many minutes can a 30 kW machine work for?