Which of the following explains why the stars of Orion's belt rise in the east and set in the west?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
A) Earth rotates once each day.
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Ethyne, H–C?C–H, is also named ______________
Fill in the blank(s) with correct word
The following three appliances are connected to a 120-V house circuit: i) toaster, 1200 W, ii) coffee pot, 750 W, and iii) microwave, 1000 W. If all were operated at the same time, what total current would they draw?
a. 5.0 A c. 23 A b. 25 A d. 6.0 A
For visible light, which property of visible electromagnetic waves changes with color?
A. Frequency and wavelength B. Amplitude and frequency C. Frequency D. Wavelength E. Amplitude
Imagine four equal positive charges, q, placed on points of a circle of radius r at the 3, 6, 9, and 12 o'clock positions. Coulomb's constant is k. The magnitude of the electric field at the center of the circle is given by
A. 4 kq/r. B. 4 kq/r2. C. kq/r2. D. kq/r. E. zero.