Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would be the result to be?
a. It would be that of copper since copper is on the outside.
b. It would be that of zinc since zinc is in the center.
c. It would be the sum of the copper and zinc specific heats.
d. It would be between that of copper and that of zinc, depending on coating thickness.
D
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A particle moves along a circular path having a radius of 2.0 m. At an instant when the speed of the particle is equal to 3.0 m/s and changing at the rate of 5.0 m/s2, what is the magnitude of the total acceleration of the particle?
a. 7.5 m/s2 b. 6.0 m/s2 c. 5.4 m/s2 d. 6.7 m/s2 e. 4.5 m/s2
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