G-, K-, and M-type stars
A) do not contain enough heavy elements to form planets
B) have lifetimes long enough for planets to form and for simple life to appear, but not long enough for advanced life to develop
C) have lifetimes too short for planet formation
D) have lifetimes long enough for advanced life to evolve
D
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A system comprising blocks, a light frictionless pulley, a frictionless incline, and connecting ropes is shown in the figure. The 9.0-kg block accelerates downward when the system is released from rest
The tension in the rope connecting the 6.0-kg block and the 4.0-kg block is closest to A) 30 N. B) 33 N. C) 36 N. D) 39 N. E) 42 N.
Fragments that do not completely burn in the atmosphere and eventually fall on Earth are called
A. asteroids. B. meteoroids. C. meteorites. D. meteors.
What proves the existence of the Kuiper belt?
A. the fact that comets are icy objects B. the fact that many comets orbit on the ecliptic C. Objects of the Kuiper belt were detected by the Hubble Space Telescope. D. the existence of short-period comets
A merry-go-round, having a radius of 2.5 m, is set in motion starting from rest, by students applying a force of 500 N tangential to the rim of the wheel. After five seconds of torque, the students let go and measure the rotational speed: 1.25 rad/s. The rotational inertia of the merry-go-round is
A. 5.0 × 103 kg m2. B. 1.7 × 103 kg m2. C. 1.0 × 104 kg m2. D. 2.5 × 103 kg m2. E. 7.5 × 102 kg m2.