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
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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. 
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
The larger the parallax shift, the closer an object is to us
Indicate whether the statement is true or false
In what way does the Heisenberg uncertainty principle limit our ability to measure exactly?