Which of these moons are most interesting to exobiologists?
A) Europa and Miranda
B) Europa and Enceladus
C) Titan and Triton
D) Triton and Charon
E) Io and Titan
B
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One experiment that informs us that gravity bends lightbeams is
A) the bending of starlight as it nears Earth. B) experiments in which laser beams are shined onto the surface of the moon, and their bending is measured. C) the observed bending of light from stars as the light passes the sun. D) the observed bending of sunlight in Earth's gravitational field. E) laboratory experiments in which laser beams pass by massive amounts of iron.
A satellite is in a circular orbit about the Earth at an altitude at which air resistance is negligible. Which of the following statements is true?
a. There is only one force acting on the satellite. b. There are two forces acting on the satellite, and their resultant is zero. c. There are two forces acting on the satellite, and their resultant is not zero. d. There are three forces acting on the satellite. e. None of the preceding statements are correct.
Given that a force vector extends from the origin to (120 N, -60.0 N), find the direction of the vector referenced to the positive x-axis.
A. 116
B. 26.6
C. -26.6
D. 122
Given the equations below, which description best fits the physical situation?
?
?
A. A projectile's displacement two seconds after being fired upward with a speed of 30.0 m/s. B. A projectile's displacement two seconds after being fired upward with a speed of 40.0 m/s. C. A projectile's displacement two seconds after being fired upward with a speed of 50.0 m/s. D. A projectile's displacement two seconds after being fired upward with a speed of 60.0 m/s. E. A projectile's displacement two seconds after being fired upward with a speed of 80.0 m/s.