Which of the following best describes why we have seasons on Earth?
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year.
B) Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others.
C) The tilt of Earth's axis causes the Northern Hemisphere to be closer to the Sun than the Southern Hemisphere in summer, and vice versa in winter.
D) The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest.
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year.
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A 1000-kg barge is being towed by means of two horizontal cables. One cable is exerting a force of 80.0 N in a direction 30.0° west of north
In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge. A) 19.5° east of north B) 21.1° east of north C) 39.0° east of north D) 47.5° east of north E) 54.7° east of north
Of the following photons, which has the highest energy?
a. infrared b. microwave c. visible d. ultraviolet
The position of an object that is oscillating on a spring is given by the equation
x = (18.3 cm) cos[(2.35 s-1)t]. What are the (a) frequency, (b) amplitude, and (c) period of this motion?
What method does not directly use heat for generating electricity?
A. Geothermal power B. Hydroelectric dams C. Natural gas D. Nuclear power plants E. All of these methods use heat to generate electricity