| Quiz | Power |
|---|---|
| Name | |
| Result | PASSED |
| Score | 8 / 8 (100%) |
| Passing score | 6.4 |
| Quiz took | 53 min 08 sec |
| Quiz finished at | 2024-03-16 09:27:39 |
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)
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?
A kettle transfers 2000 J of energy in 400 seconds. Calculate the power of the energy transfer.
An oven transfers 30 kJ of energy in 20 minutes. Calculate the power of the energy transfer.
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.