Question

Please explain how to do these and show working, this is given by my teacher! Thx!

Please solve the following problems from a) to c).

(a) If a spring compressed by 15 cm contains 22 J of potential energy, what is the spring constant (k) for that spring?

(b) What is the average useful power output of a robot that does 5.5 J of useful work in 12.0 hours? Working at this rate, how long will it take the robot to lift 3500 kg of bricks 1.8 m to a loading platform?

(c) What is the cost of operating a 3.00 W electric clock for a year in Seattle? (The cost of electricity in Seattle is 11.2 cents per kWh).

Answer 1

Thank you.