Which of the following elements is the physical basis of life on Earth?
A) Nitrogen
B) Oxygen
C) Carbon
D) Hydrogen
C
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Doppler Effect: A factory siren indicating the end of a shift has a frequency of 80 Hz where the speed of sound in air is 343 m/s. What frequency is perceived by the occupant of a car that is traveling at 30 m/s (a) towards the factory and (b) away from the factory?
Fill in the blank(s) with the appropriate word(s).
What do we mean by time dilation in relativity?
A) It is the idea that time really runs slower in reference frames moving relative to you. B) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. C) It is the idea that relativity makes time dilate, or expand, for people who study it. D) It is a hallucinogenic effect experienced by people who take too much of something.
Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today. B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices. C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization. D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?