If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately
a. 2170 Mpc.
b. 2030 Mpc.
c. 30 Mpc.
d. 0.03 Mpc.
e. 147,000 Mpc.
c
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Which two properties are most important in determining the surface temperature of a planet?
A) composition and distance from the Sun B) size and chemical composition C) size and atmosphere D) internal temperature and atmosphere E) distance from the Sun and atmosphere
An artillery shell is fired with an initial velocity of 300 m/s at 55.0° above the horizontal. It explodes on a mountainside 42.0 s after firing. If x is horizontal and y vertical, find the (x, y) coordinates where the shell explodes
Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
A) The top half of the image will be blacked out. B) The lower half of the image will be blacked out. C) The entire image will be blacked out, since the entire lens is needed to form an image. D) The image will appear as it would if the objective were not blocked, but it will be dimmer. E) There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.
Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude of the net force on the 5.0 nC charge?
A) 3.0 × 10-6 N B) 4.5 × 10-6 N C) 5.4 × 10-6 N D) 7.2 × 10-6 N E) 9.0 × 10-6 N