Most of the planets discovered around other stars using the Doppler technique
A) are more massive than Earth and orbit very close to the star.
B) are found around neutron stars.
C) are less massive than Earth and orbit very close to the star.
D) are more massive than Earth and orbit very far from the star.
E) are less massive than Earth and orbit very far from the star.
A
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Galaxies contain 10 times as much dark matter as visible matter
a. True b. False Indicate whether the statement is true or false
The rate of cratering
A) has remained constant over the last 4.6 billion years. B) has recently increased with more collisions in the asteroid belt. C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud. D) shows that large asteroid impacts are more common now than in the past. E) shows that most interplanetary debris was swept up soon after the formation of the solar system.
The constellations were created by the Greeks
Indicate whether the statement is true or false
Each y-direction force on frame ABCDEF below acts at the center of the bar segment to which it is applied. Support B is restrained against translation in the y and z directions only, and support C is restrained in the z direc- tion only. Support D is a pin support. Equilibrium of the frame requires that reaction force Cz is (in newtons):
(A) 80.8 N
(B) 67.7 N
(C) 14.8 N
(D) 92.2 N
