Water is flowing in a drainage channel of rectangular cross-section
At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A) 2.0 m/s
B) 2.5 m/s
C) 3.0 m/s
D) 3.5 m/s
E) 4.0 m/s
B
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Compton Scattering: A 29.0-pm-wavelength photon is scattered by a stationary electron. What is the maximum energy loss the photon can have? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 4.0 keV B. 6.1 keV C. 10 keV D. 12 keV E. 15 keV
The solar neutrino problem referred to the fact that, a couple decades ago, fewer neutrinos were being detected from the Sun than predicted by our theory of nuclear fusion. What was the solution to this problem?
A) We learned that the Sun is generating energy by means other than nuclear fusion. B) We learned that the Sun is generating much less energy than we thought it was. C) We learned that our detectors were mistaking neutrinos for the particles known as cosmic rays. D) We learned that our detectors were detecting only one of three different types of neutrinos that reach us from the Sun. E) We learned that our detectors were not functioning properly.
When we add a displacement vector to another displacement vector, the result is
a. a velocity. b. an acceleration. c. another displacement. d. a scalar.
A light bulb is connected to a battery as shown in Figure A below. When a second bulb is connected as shown in Figure B, what happens to the brightness of the original bulb?