The least massive particle of matter is now thought to be
A) the photon.
B) the neutrino.
C) the proton.
D) the electron.
E) the neutron.
B
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If the distance from Earth to the Moon were doubled, the gravitational force between them would increase by a factor of 22, or 4
Indicate whether the statement is true or false
For main-sequence stars, which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.
This diagram is the same as the one in the last question, showing a person on a planet watching you travel to the right at 0.9c, while you have a flashlight turned on with the light shining to the right. Which of the following statements is not true from the point of view of the person on the planet?
A) If you can accelerate enough, you'll soon be going faster than the flashlight beam. B) The light beam's speed is only 0.1c faster than your speed. C) Your mass is greater than it would be if you were not moving. D) The light from the flashlight beam is moving to the right at the speed of light c.
The Galileo mission put a spacecraft into orbit around Jupiter. Which statement about that spacecraft is true?
A) The spacecraft crashed into the moon Europa. B) The spacecraft's probe measured windspeeds in Jupiter's atmosphere. C) A saltwater ocean was discovered on Jupiter. D) Intense magnetic fields were discovered in the asteroid belt. E) A probe was released which soft landed on Io.