An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
E) a hyperbolic curve.
C
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Rank these planets in order of the strength of the greenhouse effect on the planet, from the least to the greatest
A) Mars, Mercury, Earth, Venus B) Mars, Earth, Venus, Mercury C) Mercury, Venus, Earth, Mars D) Mercury, Earth, Mars, Venus E) Mercury, Mars, Earth, Venus
A planet has two small satellites in circular orbits around the planet. The first satellite has a period 18.0 hours and an orbital radius 2.00 × 107 m. The second planet has an orbital radius 3.00 × 107 m. What is the period of the second satellite?
A) 60.8 h B) 12.0 h C) 33.1 h D) 9.80 h E) 27.0 h
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 image produced by the lens of the eye on the retina when properly focused is:
A. real and inverted B. virtual and inverted C. real and upright D. virtual and upright