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Q1. The active element of a certain laser is made of a glass rod 33.0 cm long and 1.60 cm in diameter. Assume the average coefficient of linear expansion of the glass is equal to 9.00 10-6 (°C)-1. The temperature of the rod increases by 70.0°C.

(a) What is the increase in its length?

(b) What is the increment in its diameter?

Q2. Write down an expression for the efficiency of the air cart bumper in terms of the initial and final kinetic energy of the cart. What defines a collision as elastic or inelastic?

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