The ultimate source of energy that powers the Sun is
A) chemical potential energy of hydrogen burning into helium.
B) mass energy of hydrogen fusing into helium.
C) gravitational potential energy of the contraction of the gas cloud that formed the Sun.
D) kinetic energy of the orbital motion of the Sun.
E) thermal energy of the hydrogen atoms in the Sun.
B
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When the parallax angle of a star is measured to be 0.002", the distance to the star is ________ light-years
Fill in the blank(s) with correct word
The position of a particle as it moves along the x axis is given by x = 15e-2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s?
a. 22 m/s b. 60 m/s c. 8.1 m/s d. 15 m/s e. 35 m/s
A star may undergo two or more red giant expansion stages
Indicate whether the statement is true or false
Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.9000c
From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?