Is the synthesis of ozone, O3, from oxygen, 02, an example of an exothermic or endothermic reaction?
A) exothermic because ultraviolet light is emitted during its formation
B) endothermic because ultraviolet light is emitted during its formation
C) exothermic because ultraviolet light is absorbed during its formation
D) endothermic because ultraviolet light is absorbed during its formation
Answer: D
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The amount of 
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C and 
C. Since the half-life of 
C is a bit less than 6000 y, the
bone’s age is closest to A. 36,000,000 y. B. 24,000 y. C. 12,000 y. D. 4000 y. E. 1500 y.
An object that weighs 2.450 N is attached to an ideal massless spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the spring constant of the spring?
A) 2.45 N/m B) 12.1 N/m C) 24.1 N/m D) 0.102 N/m E) 0.610 N/m
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg/m2 b. 2.2 kg/m2 c. 1.9 kg/m2 d. 2.7 kg/m2 e. 8.6 kg/m2
A cylinder rotating about its axis with a constant angular acceleration of 1.6 rad/s2 starts from rest at t = 0 . At the instant when it has turned through 0.40 radian, what is the magnitude of the total linear acceleration of a point on the rim (radius = 13 cm)?
a. 0.31 m/s2 b. 0.27 m/s2 c. 0.35 m/s2 d. 0.39 m/s2 e. 0.45 m/s2