Some of the biggest stars like VY Canis Majoris is almost the size of.
A.) The Asteroid Belt.
B.) Our Solar System.
C.) The Orion Nebula.
D.) The Orion arm of the Galaxy.
E.) The Milky Way.
Answer: B.) Our Solar System.
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The starship Enterprise locks onto an alien ship (whose mass is much greater than the Enterprise's mass) with its tractor beam (think of this as a futuristic rope) and starts to pull the alien ship toward it. Neither ship has its propulsion engines running. Which ship has greater acceleration towards the other?
A. They both move with equal acceleration B. The alien ship C. The Enterprise D. Neither ship can move because there is no friction in outer space
In order to jump off the floor, the floor must exert a force on you
a. in the direction of and equal to your weight. b. opposite to and equal to your weight. c. in the direction of and less than your weight. d. opposite to and less than your weight. e. opposite to and greater than your weight.
A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit. B. squint while looking in that direction. C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. E. reflect the rays from that direction on a shiny metal surface.