Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:
A) bluer.
B) brighter.
C) redder.
D) larger.
E) to have a higher radial velocity.
C
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Gas falling into a black hole becomes ____. a. hot, due to an increase in speed and molecular collisions b. hot, due to radiation from the black hole c. compacted into solid matter by tidal forces
d. cool, due tothe loss of gravitational energy. e. cool, due tothe emission of infrared photons
The similarity of the Sun's and the Moon's angular sizes allows ________ to occur.
A. seasons B. sunspots C. eclipses D. lunar phases E. tides
Deuterium and tritium are both
A) forms of hydrogen. B) isotopes of the same element. C) both of these D) neither of these
A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
a. 0.29 kN b. 0.49 kN c. 0.69 kN d. 0.20 kN e. 0.40 kN