A uniform solid disk of radius 1.60 m and mass 2.30 kg rolls without slipping to the bottom of an inclined plane. If the angular velocity of the disk is at the bottom, what is the height of the inclined plane?
A) 5.61 m
B) 4.21 m
C) 4.94 m
D) 6.73 m
Answer: A
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Which of the following will increase the capacitance between the plates of a parallel plate capacitor?
A) Increase the charge on the plates. B) Decrease the potential between the plates. C) Increase the potential between the plates. D) Introduce a dielectric material between the plates. E) none of the above
Imagine that you touch the ball of an electroscope with your finger while a positive rod is near the ball. What causes the flow of negative charge into the electroscope?
a. You have an excess of negative charge on your hand, which you transfer to the electroscope. b. The positively charged rod attracts negative charge to the nearby parts of the electroscope and nearby parts of your hand. c. Both a. and b. d. The rod attracts negative charge from the atmosphere. e. The negative charge is attracted because your hand and the electroscope shaft are conductors.
Thermal Expansion: A glass flask has a volume of 500 mL at a temperature of 20°C. The flask contains 492 mL of mercury at an equilibrium temperature of 20°C. The temperature is raised until the mercury reaches the 500 mL reference mark. At what temperature does this occur? The coefficients of volume expansion of mercury and glass are 18 × 10-5 K-1 (mercury) and 2.0 × 10-5 K-1 (glass).
A. 120°C B. 110°C C. 100°C D. 140°C E. 130°C
An astronomer claims to have measured the spectrum of a nearby galaxy and finds that the spectral lines are slightly blueshifted. This result is unreliable because it violates Hubble's law.
Answer the following statement true (T) or false (F)