Multiple-Object Accelerating Systems: A locomotive is pulling three train cars along a level track with a force of 100,000 N. The car next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg. You can neglect the friction on the cars being pulled.(a) What is the magnitude of the force between that the 80,000-kg car exerts on the 50,000-kg car?(b) What is the magnitude of the force that the 50,000-kg car exerts on the 70,000-kg car?
What will be an ideal response?
(a) 60,000 N
(b) 35,000 N
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A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?
a. 1.5 s b. 1.3 s c. 1.7 s d. 1.9 s e. 2.9 s
By what factor should the length of a simple pendulum be changed if the period of vibration were to be quadrupled?
a. 16 c. 0.25 b. 4.0 d. 1/16
A primary reason for you to learn science, according to the textbook's opening section, is
A) to increase your awareness. B) to pass on Western culture to the next generation. C) because a broadly educated person can get a better job. D) to increase your intelligence. E) Actually there is no good reason all this scientific nonsense.
As ice is changed to water, energy is
A) given to the ice. B) taken from the ice. C) neither of these