What produces the lunar phases?
a. The rotation of the Moon
b. The revolution of the Moon
c. The changing direction of sunlight
d. Earth's tilted axis relative to the Moon
e. The changing direction of Earth to the Moon
c
You might also like to view...
Photography Optics: A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen. Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens.(a) What magnification does the projector produce?(b) How far from the lens should the screen be placed?(c) What focal length projector lens is needed?
What will be an ideal response?
Gravitational Force: Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side. If one of the balls is released, what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2)
A. 3.7 × 10-8 m/s2 B. 2.5 × 10-8 m/s2 C. 1.9 × 10-8 m/s2 D. 4.2 × 10-8 m/s2 E. 6.4 × 10-8 m/s2
Which of the following patterns in the Milky Way structure is consistent with the idea that the Milky Way has not suffered a major collision with another massive galaxy?
A) The halo is full of old stars orbiting in many different directions. B) Globular clusters are compact groups of thousands of stars. C) The disk is composed of stars of many different ages. D) The disk is composed of stars orbiting in the same plane, same direction.
Spectral Series: Hydrogen atoms can emit four spectral lines with visible colors from red to violet. These four visible lines emitted by hydrogen atoms are produced by electrons
A. that start in the n = 2 level. B. that end up in the n = 2 level. C. that end up in the n = 3 level. D. that end up in the ground state. E. that start in the ground state.