Besides Mars, exobiologists find Europa also a good candidate for life
Indicate whether the statement is true or false
TRUE
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The _________ stars are giant stars fusing helium in their cores and then in their shells
a. turnoff-point b. main-sequence c. turnon-point d. hydrogen-flash e. horizontal-branch
The first Apollo missions to the Moon found the maria to be plains of solid lava
a. True b. False Indicate whether the statement is true or false
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 2.0 
B. 1.8
C. 1.0
D. 0.9
E. 0.6
If the magnification of a mirror is negative, which of the following is correct?
A) The image is upright and the mirror is convex. B) The image is inverted and the mirror is convex. C) The image is inverted and the mirror is concave. D) All of the previous answers can be correct. E) None of the previous answers is correct.