What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?
a. 2.8 N
b. 1.6 N
c. 1.2 N
d. 2.0 N
e. 0.4 N
d
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Because electromagnetic radiation (EMR) of sufficient energy can excite electrons from stable orbitals, EMR is considered to travel in packets of energy called _________.
Fill in the blank(s) with the appropriate word(s).
What is the approximate age of the star cluster in the HR diagram below? (Hint: Main Sequence Stars of spectral between types A and B core supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years.Type G about 10 billion years. Between K and M about 30 billion years..)
a.
200 million years
b.
2 billion years
c.
10 billion years
d.
30 billion years
e.
The age of the cluster can not be estimated from an HR diagram of the cluster.
The density of a 2-cubic meter block of mass of 1000 kg is
A) 100 kg/m3. B) 200 kg/m3. C) 500 kg/m3. D) 1000 kg/m3. E) none of the above
Classical theories predict that most of the energy from a blackbody should be radiated:
a. as thermal radiation in the infrared region. b. at the wavelength given by Wien's displacement law. c. as ultraviolet light. d. a blackbody should not radiate.