An electron in a television tube is accelerated uniformly from rest to a speed of m/s. The electron’s acceleration occurs over a distance of 2.50 cm. What is the power delivered to the electron at the instant that its displacement is 1.00 cm from the point at which it began to accelerate?
An appliance requires 3.45 kWh of energy per day.
What is the average power input for the appliance?
How many joules of energy must be supplied to the appliance in a year?
A man of mass 80.0 kg runs up a flight of stairs 20.0 m high in 10.0 s.
How much power is required for the man to rise this far in this time?
If the man’s body has an efficiency of for running up stairs, how much power was required for the run?