An ideal spring stretches by 21.0 cm when a 135-N object is hung from it. If instead you hang a fish from this spring, what is the weight of a fish that would stretch the spring by 31cm
A) 199 N
B) 91 N
C) 145 N
D) 279 N
A
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Power: A battery supplies 6.0 mA to a 12-? resistor for 1.5 h. How much electric energy does this resistor dissipate in this time?
Fill in the blank(s) with the appropriate word(s).
Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is about 1,300 watts per square meter. Determine the apparent brightness we would measure for the Sun if we were located half Earth's distance from the Sun
What will be an ideal response?
The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. The minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image is
A. 1. B. 2. C. 3. D. 4. E. 5.
The rare earth element gadolinium is ferromagnetic, and it has a saturation magnetization of 20×105 A/m at low temperatures.
(a) Calculate the number of Bohr magnetons per atom of gadolinium atom, knowing that the atomic mass is 157.2 g/mole and the density is 7.89 g/cm3. (b) What is the average number of parallel unpaired electron spins in the 4f shell per gadolinium atom?