American power plants usually supply 120 V ac
(a) At what frequency is this voltage supplied?
(b) What is the maximum voltage?
(a) 60 Hz (b) 170 V (120 V is the rms voltage)
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The chemical composition of a gas can be determined by analysis of the spectral lines of the gas.
Answer the following statement true (T) or false (F)
Explain three advantages the Hubble Space Telescope has over all ground-based telescopes
What will be an ideal response?
A convex mirror with focal length of -20 cm forms an image 15 cm behind the surface. Where is the object located as measured from the surface?
a. 30 cm c. 15 cm b. 7.5 cm d. 60 cm
Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?
a. The hardwood floor is at a lower temperature than the rug. b. The hardwood floor is at a lower temperature than your feet. c. The hardwood floor conducts heat away from your feet better than the rug. d. all of the above