The hydrogen in the universe was formed by
a. the energy of the Big Bang. b. nuclear fusion reactions in stars.
c. radioactive decay of heavy elements. d. none of the above.
a
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Water flowing through a pipe suddenly comes to a section of pipe where the pipe diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was what is its speed in this smaller section?
A) 49 m/s B) 42 m/s C) 31 m/s D) 27 m/s
The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch. When the switch is closed,
A. the current through the resistor is always greater than the current through the capacitor. B. the current through the resistor is always less than the current through the capacitor. C. the current through the resistor is always equal to the current through the capacitor. D. the capacitor does not allow current to pass. E. the current stops in the resistor.
A 1000-kg automobile moving with a speed of 24 m/s collides with a 500-kg car initially at rest. If the two stick together, what is the velocity (in m/s) of the two cars after the collision relative to an automobile moving in the same direction at 15 m/s?
A. 14 B. 16 C. 24 D. 48 E. 1.0
In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two?
a. length and force b. power and force c. length and time d. force and time