If the period of a pendulum is tripled, then by factor is the length of the string increased?
a. 3
b. 6
c. 9
d. 1/3
Ans: c. 9
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The temperature of n moles of a gas is increased from Ti to Tf at constant volume. If the molar specific heat at constant volume is CV and is independent of temperature, then change in the entropy of the gas is:
A. nCV ln(Tf /Ti) B. nCV ln(Ti/Tf ) C. nCV ln(Tf ? Ti) D. nCV ln(1 ? Ti/Tf ) E. nCV (Tf ? Ti)
The attraction between Earth and Sydney is equal to her weight. The reaction to Earth's pull on Sydney is
A) Sydney pushing against Earth's surface. B) the support of Earth's surface on Sydney. C) Sydney's pull on Earth. D) none of the above
When you swing your partner at an old-time square dance, you lock elbows and your partner is also swinging you. As a result, you both move in a circle. For this reason,
A. your pull cancels out your partner's pull, making for zero net force and no acceleration. B. you and your partner must simultaneously pull each other. C. you both must push outward against each other. D. you must pull your partner toward you and your partner must push you.
If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. decreases c. remains constant b. increases d. cannot tell from the information given