A significant source of gamma rays is ________.
A. electrons moving in Jupiter's electric field
B. a thermonuclear explosion
C. a supernova explosion
D. halogen lamps
E. the collision of two black holes
Answer: E
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How many values can the magnetic quantum number have in a hydrogen atom in which the electron has the value of the orbital angular momentum quantum number equal to 8?
A) 9 B) 15 C) 5 D) 8 E) 17
An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^-6 (°C)-1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g×°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
___________ 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
Rotational Kinetic Energy: A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A. the one of smallest diameter B. the one of greatest mass C. the disk D. the sphere E. They will reach the bottom at the same time.