Nellie whirls a tether ball in a horizontal circular path over her head. If the action force is Nellie pulling on the string, the reaction force is
A) Nellie pulling on the string.
B) the string pulling on Nellie.
C) the ball pulling on the string.
D) none of the above
Answer: B
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The Jovian planets can be eliminated as hosts for life because:
A) they do not have an atmosphere. B) they are too hot for liquid water to survive on the surface. C) they have water in the form of ice on the surface. D) they do not have solid surfaces.
Air is pumped into a bicycle tire at constant temperature. The pressure increases because:
A. more molecules strike the tire wall per second B. the molecules are larger C. the molecules are farther apart D. each molecule is moving faster E. each molecule has more kinetic energy
Escape speed from Mars is
A) about the same as from Earth. B) greater than from Earth. C) less than from Earth.
The spacing of ruled lines on a diffraction grating is 1,900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
The angular width of the gap between the first order spectrum and the second order spectrum is closest to: A) 3.3° B) 4.3° C) 5.3° D) 6.3° E) 2.3°