While on the main sequence a star's primary energy source comes from
a. nuclear fusion.
b. nuclear fission.
c. gravitational potential energy.
d. magnetic fields.
a
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If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out because an outward force balances the pull of gravity on the water
A) True B) False
Express (4.3 × 106 )-1/2 in scientific notation
A) 2.1 × 103 B) 4.8 × 10-4 C) 2.1 × 104 D) 2.1 × 10-5
Although Uranus and Neptune have no liquid metallic hydrogen in their interiors, they do have magnetic fields
a. True b. False Indicate whether the statement is true or false
Note the expression: y = A/x3 . Which statement is most consistent with this expression?
a. y is less than A. b. If x is halved, y is multiplied by eight. c. If x is doubled, y is multiplied by a factor of 8. d. y is greater than x.