Firefighters find that the temperature of burning material is best lowered when water is
A) used in small amounts.
B) pointed away from the flames.
C) sprayed as a fine mist.
D) salted.
Answer: C
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What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 ? ? m?
A) 0.00012 ? B) 0.00021 ? C) 0.0012 ? D) 0.0021 ?
Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
A) insulators. B) conductors. C) semiconductors. D) superconductors. E) polar.
The conversion of the initial potential energy of a person on a sled on a smooth icy slope into kinetic energy at the bottom is an example of the principle of conservation of ________.
What will be an ideal response?
A guitar string 0.650 m long has a tension of 61.0 N and a mass per unit length of 3.00 g/m
(a) What is the speed of waves on the string when it is plucked? (b) What is the string's fundamental frequency of vibration when plucked?