Accuracy refers to the repeatability of a measurement using a given instrument
Indicate whether the statement is true or false
FALSE
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What is meant by spectral resolution?
A) It is a measure of how much energy an object emits in different parts of the electromagnetic spectrum. B) It is a measure of how close two spectral lines can be and still be distinguishable. C) It is a measure of how close two stars can be in the sky and still be distinguishable. D) It is the same as angular resolution but applied to telescopes operating at different wavelengths.
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
(a) What is the actual efficiency of this engine? (b) What is the Carnot efficiency of this engine?
A body moving in a circular path at constant speed exhibits acceleration because its ________ is changing.
Fill in the blank(s) with the appropriate word(s).
Which has a greater buoyant force?
1) a huge lead zeppelin 2) a small helium-filled balloon 3) both 4) neither because 5) of its low density. 6) it occupies the greatest amount of space. 7) it occupies the least amount of space. 8) both have comparable densities.