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.
e
You might also like to view...
In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
a. The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths. b. The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths. c. The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present. d. The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present. e. The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
The emission of light of lower frequency after illumination by a higher frequency is referred to as
A) absorption. B) stimulated emission. C) coherence. D) phosphorescence. E) fluorescence.
As a bowling ball that rolls off the edge of a table falls, its vertical component of motion
A) decreases. B) remains constant. C) increases.
A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 3.6 × 10-6 N/C B) 1.4 × 10-3 N/C C) 1.8 × 105 N/C D) 3.6 × 103 N/C