Which of the following is least reasonable regarding cosmic background radiation (CBR)?
A) CBR correponds to a solar temperature of about 6,000 degrees and implies that the
B) The original CBR corresponded to a much higher temperature, but the expansion of
C) Satellite-based telescopes were crucial to the discovery of CBR because much of the
D) The motion of the Earth produces a Doppler shift, which causes CBR to appear a little
E) Data for CBR is collected by pointing telescopes into dark regions of the sky (that do not appear to have any bright objects).
Answer: E) Data for CBR is collected by pointing telescopes into dark regions of the sky (that do not appear to have any bright objects).
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The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon. B) gravitational pull of other planets keeps the Moon up. C) Moon has a sufficient tangential speed. D) Moon has less mass than Earth. E) none of the above
The velocity of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/ s2 )t - (6.2 m/ s3 )t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -13 m/ s2 B) -15 m/ s2 C) 13 m/ s2 D) 15 m/ s2 E) 0 m/ s2
An electron which moves with a speed of 7.5 × 10^3 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 × 10^-19 C)
a. 1.9 × 10^-15 N c. 2.2 × 10^-24 N b. zero d. 4.8 × 10^-14 N
Metals are shiny because
A) they reflect 100% of incident light. B) they are poor absorbers of light. C) their electrons vibrate to the oscillations of any incident light. D) none of the above