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Chapter 1: Q1DQ (page 1)
Explain why it would not make sense to use a full-size glass thermometer to measure the temperature of a thimbleful of hot water.
A full glass thermometer would absorb a large amount of heat from the water decreasing the real temperature of the water, which leads to a wrong read.
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Can you find two vectors with different lengths that have a vector sum of zero? What length restrictions are required for three vectors to have a vector sum of zero? Explain.
A typical adult human has a mass of about . (a) What force does a full moon exert on such a human when directly overhead with its centre away? (b) Compare this force with the pressure exerted on the human by the earth.
Given two vectorsand, (a) find the magnitude of each vector; (b) use unit vectors to write an expression for the vector difference; and (c) find the magnitude of the vector difference. Is this the same as the magnitude of? Explain.
You take an empty glass jar and push it into a tank of water with the open mouth of the jar downward, so that the air inside the jar is trapped and cannot get out. If you push the jar deeper into the water, does the buoyant force on the jar stay the same? If not, does it increase or decrease? Explain.
In 2005 astronomers announced the discovery of large black hole in the galaxy Markarian 766 having clumps of matter orbiting around once every and moving at . (a) How far these clumps from the center of the black hole? (b) What is the mass of this black hole, assuming circular orbits? Express your answer in kilogram and as a multiple of sun鈥檚 mass. (c) What is the radius of event horizon?
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