In globular clusters, the brightest stars will be:
A) massive blue main sequence stars.
B) red supergiants.
C) T Tauri stars.
D) blue stragglers.
E) planetary nebulae.
B
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Refer to the figure above. What can you conclude from the data shown on this graph alone?
A) The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years. B) Human activity has caused the carbon dioxide concentration to rise and fall many times in the past 800,000 years. C) Changes in the carbon dioxide concentration are the causes of ice ages. D) If current trends continue, carbon dioxide will soon be the most abundant gas in Earth's atmosphere.
The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10^6 m. What is the mass of planet Nutron?
a. 6.2 × 10^28 kg b. 5.0 × 10^28 kg c. 5.5 × 10^28 kg d. 4.3 × 10^28 kg e. 3.7 × 10^28 kg
The EEF shown is incorrectly drawn because
A. It curves toward the axis in a forbidden region or away from the axis in an allowed region.
B. Its wavy part doesn’t have the right number of bumps.
C. The amplitude of the wavy part varies incorrectly.
D. The wavelength of the wavy part varies incorrectly.
E. One of the exponential-like tails has the wrong length.
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy
What is the TOTAL energy of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg) A) 1.50 × 10-10 J B) 8.77 × 10-10 J C) 3.01 × 10-10 J D) 2.07 × 10-10 J E) 5.69 × 10-11 J