A plastic block of dimensions 2.0 cm × 3.0 cm × 4.0 cm has a mass of 30. grams. What is its density?
A) 1.2 g/cm3
B) 1.6 g/cm3
C) 1.3 g/cm3
D) 0.80 g/cm3
E) 2.3 g/cm3
C
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When two galaxies collide, what happens to their stars?
A. About 30% of them collide and become black holes. B. The evolution of all the stars in the larger galaxy is accelerated. C. About 50% of them become binary stars. D. Nothing happens to them, except that their orbits may change.
What is the molarity of 0.5 liters of a solution with five moles of sucrose in it?
A) 10 molar B) 0.5 molar C) 5 molar D) 2.5 molar E) 1 molar
A 2.00-m long uniform beam of mass 4.00 kg rests on a fulcrum that is 1.20 m from one end when a 3.00-kg mass rests on that end
and a 8.00-kg mass is placed at another location on the beam. How far from the end at which the 3.00-kg mass is placed is the location of the 8.00-kg mass? A) 1.45 m B) 1.75 m C) 1.35 m D) 1.55 m E) 1.65 m
An example of an action at a distance force is
a. tension b. weight c. static friction d. kinetic friction e. none of the above