A very light ideal spring stretches by 21.0cm when it is used to hang a 135-N object. What is the weight of a piece of electronic equipment that would stretch the spring by 44.9cm if you hung the equipment using the spring?

A) 405 N B) 289 N C) 176 N D) 63 N


B

Physics & Space Science

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A 2.50 A current is carried by a copper wire of radius 1.0 mm. If the density of conduction electrons is what is the drift velocity of the conduction electrons?

A.
B.
C.
D.
E.

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The larger the parallax shift, the closer an object is to us

Indicate whether the statement is true or false

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In what way does the Heisenberg uncertainty principle limit our ability to measure exactly?

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Calorimetry: A lab assistant pours 330 g of water at 45°C into an 855-g aluminum container that is at an initial temperature of 10°C. The specific heat of aluminum is 900 J/kg ? K, and that of water is 4186 J/kg ? K. What is the final temperature of the system, assuming no heat is exchanged with the surroundings?

A. 28°C B. 32°C C. 31°C D. 33°C E. 35°C

Physics & Space Science