The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c = 3.0 x 108 m/s)
A) 636 N/C B) 7.45 µN/C C) 745 N/C D) 5.23 µN/C E) 6.36 µN/C
A
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A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
a. 0 b. some positive value c. some negative value d. No answer above is correct.
If the interplanar spacing of NaCl is 2.814 × 10^?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3° b. 7.20° c. 20.5° d. 14.4° e. 29.8°
What is the Hubble constant essentially a measure of?
a. The number of galaxies in the universe. b. The expansion of the universe. c. The age of the Milky Way galaxy. d. The amount of dark matter in an average galaxy.
The formula for the Schwarzschild radius of a black hole of mass M is:
Rs = 3 × km What is the Schwarzschild radius of a 100 million-solar-mass black hole? A) 3 km B) 30 km C) 3000 km D) 300 million km E) 3 million km