Which forces have physicists shown to be the same force under conditions of very high temperature or energy, as confirmed by experiments in particle accelerators?
A) gravity and the weak force
B) gravity and the strong force
C) the strong and weak forces
D) the strong and electromagnetic forces
E) the electromagnetic and weak forces
E
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Which statement about the length of a day is FALSE?
A) At the North Pole, the day lasts six months, then six months of night. B) At the equator, every day is twelve hours long, then twelve hours of night. C) For the United States, June 21st will be the longest day. D) The solar day is four minutes longer than the sidereal one. E) The sidereal day includes both the Earth's rotation and revolution around the Sun.
Multiple-planet systems have been identified around other stars via the Doppler technique
Indicate whether the statement is true or false
Which of these is the dominant mechanism for the removal of carbon dioxide from the atmosphere?
A) subduction B) photosynthesis in plants C) dissolving carbon dioxide in seawater D) formation of carbonate-rich rocks at the seafloor
A ball rests in the middle of a cart. When you quickly jerk the cart forward, the ball
A) hits the front of the cart. B) hits the back of the cart. C) remains in the middle of the cart. D) all, depending on how quickly the cart is pulled