The astrometric method seeks to detect planets by
A) precisely measuring distances to stars.
B) directly detecting the light of planets orbiting stars.
C) measuring small changes in the positions of stars on the sky.
D) precisely measuring the velocities of stars moving toward and away from us.
E) measuring small changes in the apparent brightness of stars.
C) measuring small changes in the positions of stars on the sky.
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A wave is traveling with a velocity of 300 m/s and strikes a surface at an angle of 30.0 degrees with the normal to the surface. The wave splits into a reflected part and a refracted part. The refracted wave travels with a velocity of 400 m/s. What is the angle of refraction?
A. 20.5 degrees B. 25.9 degrees C. 30.5 degrees D. 41.8 degrees E. 50.3 degrees
A wind farm generator uses a two-bladed propeller (see figure) mounted on a pylon at a height of 20 m
The length of each propeller blade is 12 m. A small piece from the tip of the propeller breaks off when the propeller is vertical. At that instant, the period of the motion of the propeller is 1.2 s. The fragment flies off horizontally, falls with negligible air resistance, and strikes the ground at P. (a) How far is point P from the base of the pylon? (b) At what angle with respect to the vertical is the fragment moving just as it strikes the ground at P? What will be an ideal response?
Very massive stars lose their outer layers in a planetary nebula
a. True b. False Indicate whether the statement is true or false
Rank these planets in order of the strength of the greenhouse effect on the planet, from the weakest to the strongest greenhouse effect.
A) Mars, Mercury, Earth, Venus B) Mercury, Venus, Earth, Mars C) Mercury, Earth, Mars, Venus D) Mercury, Mars, Earth, Venus E) Mars, Earth, Venus, Mercury