A rigid body rotates counterclockwise about a fixed axis for exactly one second. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. Which choice represents the lowest angular speed?
1.3 rad, 6 rad
2.-1 rad, 1 rad
3.1 rad, 5 rad
2
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O stars must be formed in spiral arms because _____
a. they do not live long enough to move out of the arm b. the dust clouds they form from are only found there c. all stars are formed in spiral arms d. they are only found in spiral arms their gravitational forces takes them to that location e. they are left behind and found in the region behind the spiral arm
Compton Scattering: X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130° from their original direction. What is the kinetic energy (in keV) of each recoil electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Consider two copper wires. One has twice the length and twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has twice the resistance of the shorter wire. C) The longer wire has four times the resistance of the shorter wire. D) The shorter wire has four times the resistance of the longer wire. E) The shorter wire has twice the resistance of the longer wire.
A 230000 V-rms powerline carries an average power Pavg = 250 MW a distance of 200 km. If the total resistance of the cables is 10 ohms, what is the resistive power loss?
a. 1.0 MW b. 2.5 MW c. 5.4 MW d. 12 MW e. 10 kW