A mirror lies flat on a table. A beam of light strikes the mirror with an angle of incidence or 15, the reflected ray being to the right of the incident beam. The right edge of the mirror is then lifted so that the mirror now makes a 5 angle with the horizontal. What is the resulting angle between the incident beam and the reflected beam?
a. 25
c. 35
b. 20
d. The angle is not given.
Question 2
A hot (70C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/gC. John drops the metal into a 500-g calorimeter containing 40 g of water at 20C. The calorimeter is constructed of a material that has a specific heat of 0.10 cal/ gC. When equilibrium is reached, what will be the final temperature? (cwater = 1.00 cal/gC.)
a. 114C
c. 40C
b. 72C
d. 37C
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