An object when orbiting the Earth at a height of three Earth radii from the center of the Earth has a weight of 2.0 N. What is the object's mass? (g at the surface of the Earth is 9.80 m/s2)
a. 0.22 kg
b. 18 kg
c. 1.8 kg
d. 0.46 kg
c
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At what distance from the central axis of a long straight thin wire carrying a current of 5.0
A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A) A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm
If C = 10 ?F, what is the equivalent capacitance for the combination shown?
A. 7.5 ?F B. 6.5 ?F C. 7.0 ?F D. 5.8 ?F E. 13 ?F
A system in a certain macro state has
microstates. Through some process, the system changes the number of microstates to 
What is the change in entropy for the process?
A. 
B. 
C. 
D. 
Energy Levels: What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 205 nm B. 104 nm C. 389 nm D. 486 nm E. 610 nm