In which area of the galaxy would you find stars with fairly circular orbits about the galactic center?

a. central bulge
b. halo
c. corona
d. disk
e. galactic center


d

Physics & Space Science

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An electron in a hydrogen atom is in the n = 7 shell. How many possible values of the orbital quantum number l could it have?

A) 6 B) 7 C) 15 D) 33 E) 98

Physics & Space Science

Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 8.0-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 1.0 m/s2, what is the tension in the second string attached to the 8.0-kg mass?

a. 14 N c. 28 N b. 6.0 N d. 4.0 N

Physics & Space Science

If the radiant energy from the sun comes in as a plane EM wave of intensity 1 340 W/m2, calculate the peak values of E and B

a. 300 V/m, 10-4 T b. 1 000 V/m, 3.35 × 10^-6 T c. 225 V/m, 1.60× 10-3 T d. 111 V/m, 3.00 × 10^-5 T e. 711 V/m, 2.37 × 10^-6 T

Physics & Space Science

A drop in pressure is an indication of

A) an approaching cold front. B) orographic lifting. C) adiabatic expansion. D) a stationary front.

Physics & Space Science