How can the Doppler method be used to measure the eccentricity of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity
B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law
C) by measuring the asymmetries in the velocity curve
D) by measuring the amount by which the starlight is reduced when the planet transits
C) by measuring the asymmetries in the velocity curve
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The ionosphere can be used to conduct radio communications over long distances
a. True b. False Indicate whether the statement is true or false
A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2500 J of heat to the hot reservoir, requiring 1500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
A. 1.0 (no) B. 1.0 (yes) C. 1.5 (yes) D. 1.5 (no) E. 2.5 (no)
Estimate the cross-sectional area required for a 30-cm-long methanol-nickel heat pipe to transport 30 W at atmospheric pressure.
GIVEN ? Methanol-nickel heat pipe ? 30-cm-long ? Atmospheric pressure FIND (a) Cross-sectional area required to transport 30 W ASSUMPTIONS ? The type of wick to be used is a threaded artery wick ? 100°C operation
Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b e. none of the above