The twinkling of stars is a result of atmospheric
A) reflection.
B) refraction.
C) scattering.
D) dispersion.
E) aberrations.
Answer: B
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Car A leaves point O at t = 0 and travels a quarter circle counterclockwise at 30.0 m/s to point P. Car B will leave point O and travel to point P at the same speed but in a straight line. The radius of the circle is 100 m. At what time should car B leave point O in order to arrive at point P at the same time as car A?
A. At t = 0. B. At t = 0.52 s. C. At t = 4.71 s. D. At t = 4.98 s. E. At t = 5.24 s.
For vibrational motion, the maximum displacement from the equilibrium point is called the
A) amplitude. B) wavelength. C) frequency. D) period. E) pulse.
A 12 mF capacitor is connected in series with a 4 mF capacitor, the combination being connected across a 6 V power supply. The charge on the 12 mF capacitor is
A) 24 mC. B) 12 mC. C) 18 mC. D) 72 mC. E) 36 mC.
Two experiments are performed. In (A), an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block. In (B), an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00 kg block has a 9.00 m/s2 acceleration. The 4.00 kg block has a 4.50 m/s2 acceleration.