For a projectile launched horizontally, the vertical component of a projectile's velocity
A) is zero.
B) remains a non-zero constant.
C) continuously increases.
D) continuously decreases.
E) any of the above, depending on position.
C
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Why must radio telescopes have very large dishes?
A. A large mirror is necessary to resolve radio-emitting images. B. The large dish is to compensate for atmospheric absorption of radio waves. C. Large radio telescopes are easier to repair than small instruments. D. Radio-emitting objects are very far from Earth, and so are very dim. E. Size is immaterial to quality observations.
What method of extrasolar planet relies on the star getting brighter than usual and thenfainter again?
a) astrometry b) radial velocity c) direct imaging d) microlensing e) transits
The sun has a radius of 7 × 108 m and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
GIVEN • The sun approximates a blackbody • Surface temperature (Ts) = 5800 K • Radius (r) = 7 × 108 m FIND (a) The total rate of radiation from the sun (qr) (b) The radiation flux per square meter of surface area (qr/A) PROPERTIES AND CONSTANTS he Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Which of the following best describes the property of the period of orbital revolution for an Earth satellite?
a. greater when the orbital radius is smaller b. greater when the orbital radius is larger c. independent of the orbital radius d. determined mainly by the satellite's mass