Collisions between galaxies tend to destroy, not create, stars
Indicate whether the statement is true or false
FALSE
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Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 58.5 m/s. Consider all quantities as positive in the upward direction. At time t = 5.97 s, the vertical velocity of the ball is closest to
A. 0 m/s. B. +175 m/s. C. +12 m/s. D. -175 m/s. E. -12 m/s.
If we had never discovered quantum mechanics, which of the following would be true?
A) We would not have electronic devices such as cell phones and laptops. B) The physical world would behave much differently. C) Nothing would be different because quantum mechanics has not led to any changes in the lives of people. D) The Sun would not shine.
Which of the following things is an “extended object”? For each item, answer “A” if the item is an acceptable extended object, “B” if the definition of an extended object applies badly to the item, and “D” if it is debatable.
(a) An electron (b) An atom (c) A rock (d) A swarm of bees (e) The earth’s atmosphere (f) The water in an ocean current (g) Sugar molecules dissolved in a cup of water (h) The vacuum between galaxies
As a proton moves in a direction perpendicular to the electric field lines
A) it is moving from low potential to high potential and gaining electric potential energy. B) it is moving from low potential to high potential and losing electric potential energy. C) it is moving from high potential to low potential and gaining electric potential energy. D) it is moving from high potential to low potential and losing electric potential energy. E) both its electric potential and electric potential energy remain constant.