If Earth had twice its present mass but it orbited at the same distance from the sun as it does now, its orbital period would be
A) 4 years.
B) 3 years.
C) 2 years.
D) 1 year.
E) 6 months.
D
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Nuclear Reactions: A proton strikes an oxygen-18 nucleus, producing fluorine-18 and another particle X. What is the other particle X?
A. neutron B. positron C. alpha particle D. electron E. gamma ray
Which of the following is not true of Mercury?
A) Even on Mercury's night side, the temperature is hot enough to melt lead. B) Mercury rotates exactly three times for every two orbits it makes around the Sun. C) Its surface is heavily cratered. D) Mercury has essentially no atmosphere.
If the central engine for our Milky Way is a black hole of 3 million solar masses, then it has an event horizon about ________ kilometers across
Fill in the blank(s) with correct word
Every particle has a corresponding antiparticle
a. True b. False Indicate whether the statement is true or false