A 400-N crate rests on a ramp; the maximum angle just before it slips is 15.0° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
a. 3.7
b. 0.47
c. 2.1
d. 0.27
e. 0.40
d
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The day on Earth for which people in the Northern hemisphere experience the longest amount of daylight compared to night.
summer solstice winter solstice vernal equinox winter solstice
The parallax of a star is ________ usually measured in ________.
A. a distance; AUs B. an angle; arc seconds C. a distance; arc seconds D. an angle; parsecs
Of the following energies for photons, which is the least energy that could result in photoelectron production if the work function is 3.77 eV?
a. 2.72 eV b. 3.19 eV c. 4.57 eV d. 6.98 eV e. 6.53 eV
A telescope is used to view two small lights separated by 2.0 cm at a distance of 500 m. What minimum objective lens diameter is needed to just resolve these objects if their wavelength is 656 nm?
a. 2.0 cm b. 1.0 cm c. 1.2 cm d. 2.4 cm