What is the lifetime of a star of 0.1 solar masses and a luminosity of 0.01 that of the Sun? Assume the lifetime of the Sun is 10 billion years
A) 10 billion years
B) 100 billion years
C) 10 trillion years
D) 10 million years
E) This star will never start hydrogen fusion reactions because it is not massive enough.
B
You might also like to view...
The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA ? VC, at t = 3.0 s?
a.
?7.2 V
b.
+7.2 V
c.
?4.8 V
d.
+4.8 V
e.
?12 V
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
a. it has the same position and the same velocity as A. b. it has the same position and the same acceleration as A. c. it has the same velocity and the same acceleration as A. d. it has the same displacement and the same velocity as A. e. it has the same position, displacement and velocity as A.
An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 55° with the vertical. What is the length of the athlete's jump if air resistance is of no significance?
A) 0.88 m B) 8.0 m C) 12 m D) 17 m E) 4.0 m
What force will a negative charge placed at location C feel?
a. zero b. a force up and to the left c. a force up and to the right d. a force down and to the left e. a force down and to the right