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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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.
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?
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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?