When you step off a bus moving at 2 m/s, your horizontal speed when you meet the ground is
A) zero.
B) less than 2 m/s but greater than zero.
C) about 2 m/s.
D) greater than 2 m/s.
Answer: C
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It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life
a. True b. False Indicate whether the statement is true or false
According to the second law of thermodynamics, for any process that may occur within an isolated system, which one of the choices applies?
A) Entropy remains constant. B) Entropy increases. C) Entropy decreases. D) Both A and B are possible. E) Both A and C are possible.
As shown in the figure, a container has a vertical tube, whose inner radius is 32.00 mm, connected to it at its side. An unknown liquid reaches level A in the container and level B in the tube level A being 5.0 cm higher than level B. The liquid supports a 20.0 cm high column of oil, between levels B and C, whose density is 460 kg.m-3. What is the density of the unknown liquid?
A. 1800 kg/m3
B. 1600 kg/m3
C. 1400 kg/m3
D. 2000 kg/m3
E. 1700 kg/m3
If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary
a. faster than b. slower than c. the same as