A main difference between a radio wave and a sound wave is
A) frequency.
B) wavelength.
C) energy.
D) amplitude.
E) medium or no medium.
Answer: E
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At what temperature is the Celsius temperature and the Fahrenheit temperature are same?
A. 30
B. 35
C. -40
D. 45
E. -30
While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity
A) increases. B) remains unchanged. C) decreases.
Which of the following best describes the meaning of declination and right ascension?
A) They are coordinates on the celestial sphere, with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the March equinox. B) They are coordinates on the celestial sphere that are similar to the coordinates of altitude and direction on Earth. C) They are used to describe the locations and distances of stars that we see in the night sky. D) They are terms used by astronomers to describe how the sky changes with the seasons.
A satellite orbiting the Earth in a circular orbit at 400 miles from the center of Earth is moved to a distance of 1,200 miles from the center of Earth. The gravitational force between the Earth and satellite changes by a factor of 3
a. True b. False Indicate whether the statement is true or false