Strictly speaking, the ratio of circumference to diameter for a circle equals ? as we know it
A) in flat space.
B) on a spherical surface.
C) on a saddle-shaped surface.
D) all or any of the above
E) none of the above
Answer: A
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The time constant in an RC circuit is the time that is required for the charge on the capacitor in a circuit with an initially uncharged capacitor to reach what percentage of its final value?
A. 50% B. 37% C. 100% D. 63% E. 90%
Why do supernova remnants have limited lifetimes?
What will be an ideal response?
Which of the following locations has the smallest (in magnitude) magnetic declination?
a. Washington state b. the South Carolina – Georgia border c. the San Francisco – Oakland area d. western Colorado
Atoms in crystals are typically separated by distances of 0.10 nm
What kinetic energy must a nonrelativistic electron have, in electron-volts, in order to have a wavelength of 0.10 nm? (melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)