_____ are similar in size
A) Mercury and Earth
B) Earth and Venus
C) Venus and Jupiter
D) Jupiter and Neptune
B
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Which force can act over distances comparable to the distance between planets?
a. only gravitational b. only electrical c. only magnetic d. All of the above.
A spaceship moves at a speed of 0.95 c away from the Earth. It shoots a star wars torpedo toward the Earth at a speed of 0.90 c relative to the ship. What is the velocity of the torpedo relative to the Earth? (The direction in which the spaceship moves is the positive direction.)
a. ?0.34 c b. 0.34 c c. 0.060 c d. ?0.060 c e. 0
The force responsible for chemical bonding is
a. nuclear. b. electromagnetic. c. none of these. d. gravitational.
The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________
a. silica content b. hardness c. color d. grain size