Alphonse moves eastward in a car at 30 m/s. Velma, moving eastward in a train at 70 m/s, passes him. Alphonse's velocity relative to Velma is
A) 40 m/s westward.
B) 100 m/s eastward.
C) 40 m/s eastward.
D) 30 m/s westward.
E) 100 m/s westward.
A
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A) 0.29 m B) 0.58 m C) 10.96 m D) 0.19 m
What element has a K? line with wavelength 1.46 × 10-11 m?
A) Protactinium B) Niobium C) Uranium D) Zirconium
Terminal Voltage and Internal Resistance: A battery has an emf ? = 12 V and an internal resistance r = 2.0 ?, as shown in the figure. When a 3.0-? cable is connected across the battery terminals a and b, the rate at which chemical energy in the battery is depleted is closest to
A. 24 W. B. 27 W. C. 29 W. D. 32 W. E. 34 W.
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A. -2900 J B. -1700 J C. 2900 J D. 1700 J E. 0 J