A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted. Sound travels at 340 m/s in the air
How many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall?
117 ms
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Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy B. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B. B) Galaxy B is four times as far as Galaxy A. C) Galaxy B is twice as far as Galaxy A. D) Galaxy A is four times as far as Galaxy B. E) Not enough information to say; you need to know Hubble's constant to answer this question.
The deepest depression found on the surface of Mars is the:
A) Mariannas Trench. B) Caloris basin. C) Valles Marineris rift. D) Hellas Basin of Mars. E) Mare Crisium.
A constant force of 12 N in the positive x direction acts on a 4.0-kg object as it moves from the origin to the point 
m. How much work is done by the given force during this displacement?
A. +60 J B. +84 J C. +72 J D. +48 J E. +57 J
Which of these compounds would be ionic?
a. NO2 b. CCl4 c. LiF d. H2S