Consider an apple falling from a tree. Which of the following applies to this situation?
A. Earth is attracting the apple.
B. The apple is attracting Earth.
C. Earth is attracting the apple; the apple is not attracting Earth.
D. The apple is attracting Earth and Earth is attracting the apple.
Answer: D
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Heat escapes from a planet's surface into space by thermal radiation. In which wavelength range do planets radiate most of their light?
A) infrared B) radio C) visible D) ultraviolet E) x-rays
What affects long-term climate change?
a. changes in the Sun’s brightness b. changes in Earth’s reflectivity c. change in the tilt of Earth’s axis d. changes in greenhouse gas abundance e. all of the above
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the TOTAL energy of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 5.69 × 10-11 J B) 1.50 × 10-10 J C) 2.07 × 10-10 J D) 3.01 × 10-10 J E) 8.77 × 10-10 J
Someone on the far side of the Moon would observe Earth rise once every
a. 24 hours. b. 24 hours and 50 minutes. c. 29.5 Earth days. d. None of these, the observer would never see Earth rise.