The human eye is sensitive to light with wavelength up to 750 nm. What is the frequency of radiation at this wavelength? (1 nm = 10-9 m and c = 3.00 × 10^8 m/s)
a. 8.5 × 10^8 Hz
c. 4.0 × 10^14 Hz
b. 1.8 × 10^8 Hz
d. 7.7 × 10^14 Hz
C
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Equilibrium: A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure. What is the magnitude of the force F?
Fill in the blank(s) with the appropriate word(s).
Pressure: When a heavy metal block is supported by a cylindrical vertical post of radius R, it exerts a force F on the post. If the diameter of the post is increased to 2R, what force does the block now exert on the post?
A. F/4
B. F/2
C. F/
D. F
E. 2F
Sound waves propagate in
a. one dimension. b. two dimensions. c. three dimensions. d. four dimensions.
A pressure of 10.0 mm Hg is measured using a constant-volume gas thermometer at a temperature of 50.0°C. What is the pressure (in mm Hg) at the zero-point temperature?
a. 31.8 b. 11.8 c. 8.45 d. 54.6 e. 68.3