Why are the spokes fitted in a cycle wheel?

Indicate the step in the citric acid cycle, where FAD is reduced to FADH_2 .

Why are solids rigid?

Why are wheels circular?

Is the large brake on a bicycle wheel more effective than a small one? Explain.

An ideal gas is taken through the cycle ArarrBrarrCrarrA' as shown. If the net heat suplied to the gas in the cycle is 5J. Calculate the work done by the gas in the process CrarrA'. Give the interpretation of the result.

Rehman is making a wheel using spokes. He wants to fix equal spokes are equal.Calculate the angle between a pair of consecutive spokes on a wheel with 15 spokes.

Why are we not able to rotate a wheel by pulling or pushing along its radius?

Represent schematically the nitrogen cycle. Name the organisms involved in this cycle.