A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A) 0.80 g/cm3
B) 1.20 g/cm3
C) 1.25 g/cm3
D) 1.60 g/cm3
C
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What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.86 × 1015 Hz?
A) 17,000 K B) 14,500 K C) 19,000 K D) 20,400 K E) 18,000 K
Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about is 3 g/cm3 . Ice or water is 1.0 g/cm3 . . This implies that
a. Pluto has a large iron-nickel core. b. Pluto is about 50% water and 50% rocky material. c. Pluto is all rock. d. Pluto is all water or water ice.
Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field 
. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.A 4.00 kg object is moving at 5.00 m/s NORTHWEST. It strikes a 6.00 kg that is moving SOUTHWEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 6.00 kg object after the collision is
A. 2.33 m/s at an angle of 45.0 degrees NORTH of WEST. B. 3.89 m/s at an angle of 35.0 degrees NORTH of WEST. C. 3.89 m/s at an angle of 14.0 degrees NORTH of WEST. D. 2.33 m/s at an angle of 14.0 degrees NORTH of WEST. E. 2.33 m/s at an angle of 35.0 degrees NORTH of WEST.