Electric Field of Point-Charges: Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?
A. A
B. B
C. C
D. D
Answer: B
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A salesman attempts to convince you to purchase a "solar neutrino shield" to protect you and your family. (It's even "on sale!") Why do you turn down this excellent offer?
A) Neutrinos rarely, if ever, interact with other matter. B) There's no such thing as a solar neutrino. C) Solar neutrinos are generated by solar winds, but we're in a solar minimum now, so the risk of damage is very low. D) The Earth's natural magnetic field already offers excellent protection against the onslaught of solar neutrinos.
Most of the mass in the Milky Way Galaxy is located
A) in the gas and dust. B) in the halo (above/below the disk). C) in the central bulge of the galaxy. D) within the disk. E) in the stars in the spiral arms.
If a quantum of radiation has an energy of 3.0 keV, what is its wavelength? (h = 6.63 × 10^-34 J×s, 1 eV = 1.60 × 10^-19 J, c = 3.00 × 10^8 m/s, and 1 nm = 10-9 m)
a. 0.62 nm c. 0.41 nm b. 0.32 nm d. 1.02 nm
The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What is the amplitude of the wave?
A) 6.00 mm B) 12.0 mm C) 3.00 mm D) 2.00 mm E) None of the other choices is correct.