Examine the following figure, which demonstrates star trails that would be visible in a photo centered on the North Star (Polaris) when the camera's shutter is left open to reveal the path the stars are taking as they move during part of one night. Which of the following best describes your observations?
A. Some stars move in a counterclockwise path around Polaris, while others move in a clockwise path.
B. The stars closest to Polaris move in smaller circles.
C. All of the stars move in a counterclockwise path around Polaris.
D. All of the stars move from east to west.
E. Each star moves in a circular path of the same radius.
F. All of the stars move in a clockwise path around Polaris.
Answeer: B- The stars closest to Polaris move in smaller circles
C- All of the stars move in a counterclockwise path around Polaris
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A parallel plate capacitor has a paper dielectric having dielectric strength 8.00 kV/mm and dielectric constant 3.00. The plate area is 3000 
and the plate separation is 0.500 mm. If 10.0 V are applied to this capacitor, what is the charge on the capacitor?
A. 50.0 
C
B. 42.0 nC
C. 160 nC
D. 16.0 nC
E. 42.0 C
The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time. The threshold of hearing is 1.0 × 10-12 W/m2.What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is 1.0 × 10-12 W/m2.
A) 300 dB B) 60 dB C) 74 dB D) 67 dB E) 81 dB
A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg×°C.)
a. 9 b. 2 c. 5 d. 21 e. 0.5
Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI1 and height L; column 2 has flexural rigidity (2/3)EI2 and height L. The ratio (I2/I1) at which both columns will buckle under the same load is approximately:
(A) 0.8
(B) 1.0
(C) 2.2
(D) 3.1