This diagram shows the life tracks from protostar to the main sequence for several stars of different masses. Which track represents the star that takes the longest amount of time to reach the main sequence?
A) Track 1
B) Track 2
C) Track 3
D) Track 4
E) Track 5
A) Track 1
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Because the Hubble constant equals 70 km/s/Mpc, a galaxy with a recession velocity of 4,900 km/s would be a distance of ____ Mpc from Earth
a. 0.014 b. 70 c. 4930 d. 4970 e. 343,000
Main-sequence stars have about the same density as the Sun but giant stars have very low densities
a. True b. False Indicate whether the statement is true or false
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2. At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
A. 0.55 s B. 0.63 s C. 0.69 s D. 0.59 s E. 0.47 s
The most abundant element in Saturn's atmosphere is
A) ammonia. B) hydrogen. C) helium. D) methane. E) nitrogen.