The root-mean-square speed (thermal speed) of a certain sample of carbon dioxide molecules, with a molecular weight of 44 g/mol, is 396 m/s
What is the root-mean-square speed (thermal speed) of water vapor molecules, with a molecular weight of 18 g/mol, at the same temperature?
A) 253 m/s
B) 396 m/s
C) 421 m/s
D) 506 m/s
E) 619 m/s
Answer: E
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A rectangular loop (area = 0.250 m2) turns in a uniform magnetic field with B = 0.210 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is ?/2 rads and increasing at the rate of 0.530 rad/s, what is the magnitude of the emf induced in the loop?
a. 5.25E–2 V b. zero c. 2.78E–2 V d. 9.91E–2 V e. 1.47E–2 V
Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° east of south. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 2.0 m at an angle of 30° north of west. B. 2.0 m at an angle of 30° east of south. C. 10.0 m at an angle of 60° north of west. D. 10.0 m at an angle of 60° east of south. E. 1.0 m at an angle of 60° north of west.
The most luminous stars in elliptical galaxies are:
A) B stars. B) O stars. C) blue supergiants. D) red giants.
Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A. What is the magnitude of the force per unit length that each wire exerts on the other wire? (?0 = 4? × 10-7 T ? m/
A) A) 2.00 ?N/m B) 12.0 ?N/m C) 38.0 ?N/m D) 16.0 ?N/m E) 5.00 ?N/m