Water comes down the spillway of a dam from an initial vertical height of 170 m. What is the highest possible speed of the water at the end of the spillway?
a. 5.89 m/s
b. 18.4 m/s
c. 57.7 m/s
d. 1 670 m/s
e. 3 330 m/s
c
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The first confirmed detections of extrasolar planets occurred in
A) the 1990s. B) the mid-17th century. C) the 1920s. D) 2009.
Earlier than a certain time, the laws of modern physics cannot describe the universe adequately. Roughly when is that time?
A: 10^43 seconds B: 10^33 seconds C: 1 minute D: 3 minutes E: 1 million years
Two long wires are parallel to each other. One wire carries a current directed due east and the other carries a current of the same magnitude, but directed due west. Which one of the following statements concerning this situation is false?
a) The magnetic field in the plane of the wires at the midpoint between the two wires is equal to zero tesla. b) The magnetic forces due to the currents carried by the wires causes the wires to move apart. c) If you are looking toward the west along the wire carrying the current toward the west, the magnetic field lines are directed clockwise around the wire d) The magnetic field produced by each wire has its greatest magnitude outside, but near the surface of the wire.
An electron in a hydrogen atom makes a transition from the n = 3 to the n = 1 energy state. Determine the wavelength of the emitted photon (in nm)
a. 1 006 b. 209 c. 306 d. 103 e. 821