As a spaceship nears the Moon, its mass
1) varies slightly with distance,
2) increases,
3) decreases,
4) remains unchanged,
while the Moon's gravitation force on the ship
5) increases.
6) decreases.
7) remains unchanged.
Answer: 4, 5
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Our Sun formed ________ our galaxy formed.
A) before B) at the same time that C) billions of years after D) within about 10 million years after
The principle of equipartition of energy states that the internal energy of a gas is shared equally:
A. among the molecules B. between kinetic and potential energy C. among the relevant degrees of freedom D. between translational and vibrational kinetic energy E. between temperature and pressure
Which statement about antimatter is not true?
A) An antielectron (positron) is identical to an ordinary electron except it has a positive charge. B) Every ordinary particle has a corresponding antiparticle. C) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy. D) Antimatter has been hypothesized to exist but has never actually been detected.
A uniform sphere of radius R and mass M rotates freely about a horizontal axis that is tangent to an equatorial plane of the sphere, as shown below. The rotational inertia of the sphere about this axis is
?
?
A.
.B.
.C.
.D.
.E.
.