The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.
b
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The lowest-mass stars cannot become giants because
a. they do not contain helium. b. they rotate too slowly. c. their convective interiors prevent the development of an inert helium core surrounded by unprocessed hydrogen. d. they contain strong magnetic fields. e. they never use up their hydrogen.
Most of the planets discovered around other stars using the Doppler technique
A) are more massive than Earth and orbit very close to the star. B) are found around neutron stars. C) are less massive than Earth and orbit very close to the star. D) are more massive than Earth and orbit very far from the star. E) are less massive than Earth and orbit very far from the star.
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.You drop the box. As it falls to its original level, its kinetic energy is
a. 0 b. 4 J. c. 100 J. d. none of the above.
A Doppler red shift indicates
a. a shift toward higher frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.