Time Dilation: You are moving past the Earth at 0.990c and notice your heart beating 88 beats per minute.(a) If a doctor on Earth measures your heart rate as you zip past, what will the measured rate be?(b) If you had been moving 99.99% the speed of light, what rate would you have observed your heart beats?
What will be an ideal response?
(a) 12 beats/min (b) 88 beats/min
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Bacteria reproduce by the process of cell division. This kind of reproduction is referred to as
A) sexual B) unsexual C) asexual D) agamic
The expansion rate of the Universe is
A) increasing. B) decreasing. C) constant. D) different in different directions. E) independent of time.
A 6.0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is 0.40 m, and the amplitude is 4.0 mm, is propagating on the wire
The time for a crest of this wave to travel the length of the wire is closest to A) 19 ms. B) 16 ms. C) 21 ms. D) 23 ms. E) 25 ms.
Which of the following statements correct describes overall energy balance in a star?
A) Gravity balances pressure. B) Energy generated by fusion in the core balances the energy emitted from the star's surface. C) Temperature balances light energy emitted at the photosphere. D) Energy in sunspots balances energy in magnetic fields.