Studies of a star's position made on the same calendar date over subsequent years yield ________
Fill in the blank(s) with correct word
proper motions
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__________is an isotope of hydrogen in which the nucleus contains a proton and a neutron
A) Deuterium B) Neutrino C) Tritium D) Hydrogen-4
Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
A) The acceleration is toward the east. B) Since the car is slowing down, its acceleration must be negative. C) The acceleration is zero. D) The acceleration is toward the west.
A heavy sled and a light sled, both moving horizontally with the same kinetic energy, suddenly slide onto a rough patch of snow and eventually come to a stop
The coefficient of kinetic friction between the sleds and the rough snow is the same for both of them. Which of the following statements about these sleds are correct? (There could be more than one correct choice.) A) Both sleds will slide the same distance on the rough snow before stopping. B) The heavy sled will slide farther on the rough snow than the light sled. C) The light sled will slide farther on the rough snow than the heavy sled. D) On the rough snow, the change in kinetic energy will be the same for both sleds. E) The friction force exerted on the sleds by the snow will do the same amount of work on both sleds.
The Sun appears to travel daily in the sky
a. one degree in 4 minutes. b. 7 ° in one hour. c. 360° in 12 hours. d. 23.5° in one year.