____ in other galaxies should contain luminous O and B stars if they are like the Milky Way

a. The halos
b. The bulges
c. The spiral arms
d. The globular clusters
e. The coronas


C

Physics & Space Science

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How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual image magnified in size by a factor of three?

A) 33.3 mm B) 48.0 mm C) 38.3 mm D) 42.2 mm E) 54.4 mm

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An insulator has a positive electric charge of 2.4 × 10^ -17 C. How many electrons were added or removed?

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The radioactive nuclei 60Co is widely used in medical applications. It undergoes beta decay, and the total energy of the decay process is 2.82 MeV per decay event

The half-life of this nucleus is 272 days. Suppose that a patient is given a dose of 6.9 µCi of 60Co. If all of this material decayed while in the patient's body, what would be the total energy deposited there? (1 Ci = 3.70 × 1010 decays/s) A) 11 J B) 8.6 GJ C) 3.9 J D) 24 J E) 4.15 MJ

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Which law of thermodynamics addresses the direction of heat flow?

A) First law B) Second law C) Third law D) all of the above

Physics & Space Science