What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice is less rigid and has a lower melting point than rock.
B) Ice is colder than rock.
C) Ice contains more radioactive elements than rock.
D) Ice is affected by tidal forces to a greater extent than rock.
E) Ice is less dense than rock.
A) Ice is less rigid and has a lower melting point than rock.
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How do X-ray measurements help us measure the amount of dark matter in galaxy clusters?
A) X-rays are emitted by hot gas, and the intracluster gas is heated by collisions with dark matter particles. More dark matter leads to greater heating, and hence stronger X-ray emission. B) Dark matter absorbs X-rays. Therefore, more dark matter leads to weaker X-ray emission from galaxy clusters. C) X-rays are emitted by hot gas, and the intracluster gas is heated by the gravitational effects of dark matter. More dark matter leads to greater heating, and hence stronger X-ray emission.
The critical angle for an air-glass interface is 29.6°. When a light ray in air is incident on the interface, the reflected ray is 100% polarized
What is the angle of refraction of that ray? A) 26.3° B) 25.7° C) 23.9° D) 24.5° E) 25.1°
The water in a river flows downstream at 3.0 M/s. A boat is motoring upstream against the flow at 5.0 m/s. What is the boats speed of relativity to the riverbank/
A. 8.0 M/s B. 5.0 M/s C. 3.0 M/s D. 2.0 m/s
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s b. 16 m/s c. 24 m/s d. 30 m/s e. 4.0 m/s