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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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.
First Law of Thermodynamics: An expansion process on an ideal diatomic ideal gas for which CV = 5/2 R has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.030 m3, and the temperature is 390 K. The final pressure is 150 kPa and the final temperature is 340 K. What is the change in the internal (thermal) energy of the gas, during this process? (R = 8.31 J/mol ? K)
A. -2900 J B. -1700 J C. 2900 J D. 1700 J E. 0 J
A cat leaps to try to catch a bird. If the cat's jump was at 60° off the ground and its initial velocity was 2.74m/s what is the highest point of its trajectory, neglecting air resistance?
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