A car decelerates uniformly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slowing down?
A) 10 km/h-s
B) 5 km/h-s
C) 9.8 m/s2
D) 8 km/h-s
E) 4 km/h-s
A
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Observations show that elements with atomic mass numbers divisible by 4 (such as oxygen-16, neon-20, and magnesium-24) tend to be more abundant in the universe than elements with atomic mass numbers in between. Why do we think this is the case?
A) At the end of a high-mass star's life, it produces new elements through a series of helium capture reactions. B) The apparent pattern is thought to be a random coincidence. C) Elements with atomic mass numbers divisible by 4 tend to be more stable than elements in between. D) This pattern in elemental abundances was apparently determined during the first few minutes after the Big Bang.
A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?
a. It is the same note since the same fret is being used. b. It is at higher frequency than the original note. c. It is at lower frequency than the original note. d. It can be either higher of lower frequency depending on whether the original note was above or below middle C.
Which of the following are found on Triton?
a. craters b. flooded basins c. atmospheric clouds d. a thick nitrogen atmosphere e. craters, flooded basins, atmospheric clouds, and a thick nitrogen atmosphere
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)
What will be an ideal response?