The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal.
B) always are in the red part of the visible spectrum.
C) have wavelengths that are shorter than normal.
D) have a higher intensity in the red part of the spectrum.
A
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When a car of mass accelerates from 10.0 m/s to some final speed, 4.00 × 105 J of work are done on it by the frictional force exerted on the car by the road's surface. Find this final speed
A) 28.0 m/s B) 22.4 m/s C) 25.2 m/s D) 30.8 m/s
What causes the meteor showers we witness on Earth? a. Earth passes through comet dust particles
b. Earth passes through remnants of an impacted asteroid. c. Earth passes through the asteroid belt. d. Earth passes through the coma of a comet. e. Earth passes through solar wind particles.
Other than radioactive decay, how can energy be released from the nucleus?
A) Nuclear fission. B) Nuclear fusion. C) Both of the above. D) Thermal decay. E) All of the above.
What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.They repel each other. 2.They attract each other. 3.They may attract or repel each other, depending on whether the charge on the insulator is positive or negative. 4.They exert no electrostatic force on each other. 5.The charged insulator always spontaneously discharges.