In a fly wheel, most of the mass is concentrated at the rim. Explain why?

Ammonia is soluble in water . Explain why?

Plaster of paris should be stored in a moisture - proof container. Explain why?

Aluminium is not dissolved in concentrated HNO_3 solution. Why?

Why is respiration considered an exothermic reaction? Explain.

Fill in the blanks Almost the entire mass of an atom is concentrated in______.

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

High concentration of ozone is highly explo-sive. Why?

A wheel with 25 metallic spokes each 0.4m long is rotated with a speed of 150 rev//min in a plane normal to the horizontal components of earth's magnetic field H_B at a place. If H_E=0.4G at the place, what is the induced emf between the axle and the rim of the wheel?