Which of the following explains why the Moon rises in the east and sets 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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Scientific Notation: Express (2.2 × 106)-1/2 in scientific notation.
A. 6.7 × 10-4 B. 1.5 × 103 C. 1.5 × 10-5 D. 1.5 × 104
According to the principle of complementarity, wavelike and particle-like properties of light
A) only slightly contradict each other. B) very much contradict each other. C) make up a wholeness that better describes nature. D) none of the above
A gray transparent surface has the spectral reflectivity shown. Determine the average reflectivity and transmissivity at 500 K and at 850 K.
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N