A car is driven 1200 m north at 20.0 m/s and then driven 1600 m east at 25.0 m/s. What is the magnitude of the average velocity for this trip?
a. 16.1 m/s
b. 22.6 m/s
c. 31.3 m/s
d. 11.3 m/s
e. 62.2 m/s
a
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A mass on a spring vibrates in simple harmonic motion at a frequency of 3.2 Hz and an amplitude of 6.4 cm. If a timer is started when its displacement is a maximum (hence x = 6.4 cm when t = 0), what is the displacement of the mass when t = 3.3 s?
a. zero b. –5.95 cm c. –2.36 cm d. 2.53 cm
Why didn't elements heavier than helium form in the first minutes of creation?
A) When He-4 was formed, the expansion cooled the cosmos below 100 million K. B) The first generation of stars used them up too quickly to observe them. C) The electrons slowed down enough to be captured into orbits by protons. D) There was not enough matter in the universe at that time. E) Only Type I supernovae can produce iron and heavier elements.
Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds
A) increases. B) remains constant. C) decreases. D) cannot be determined from the information given.
Which of the following is not a vector quantity?
a. temperature c. acceleration b. velocity d. displacement