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This is a science question about series and parallel circuits

environmental sciences

Describe the significance of the community to SD and the issues that arise when involving communities in sustainability programs.
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What is the spring constant of a spring that stores 25 J of elastic potential energy when compressed to 7.5 cm

A spring with constant k = 800 N/m is compressed 12 cm from its equilibrium position. A spring with spring constant k = 400 N/m has the same elastic potential energy as the first spring when it extension is?

How much does a spring with a spring constant of 650 N/m need to be compressed in order to store 20.0 J of elastic potential energy?

What is the spring constant of a spring that is compressed 0.2 m and has 1.50 J of elastic potential energy stored in it?

Calculus Question

6) A human-powered airplane, the Gossamer Albatross, flew from England, to France. It covered a straight-line distance of 38.5 km in 2 h 49 min. What was its average speed?