____ 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
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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
An insulator has a positive electric charge of 2.4 × 10^ -17 C. How many electrons were added or removed?
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
Which law of thermodynamics addresses the direction of heat flow?
A) First law B) Second law C) Third law D) all of the above