Significant Figures: What is 56 + 
written with the correct number of significant figures?
A. 62.8
B. 62.812
C. 62.81
D. 63
E. 62.8123846
Answer: D
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A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4
A 25.0-kg box is released on a 27° incline and accelerates down the incline at 0.30 m/s2 Find the friction force impeding its motion. What is the coefficient of kinetic friction?
What will be an ideal response?
What is the image distance of an object 1.85 m in front of a converging lens of focal length 26.3 cm?
a. + 23.0 cm b. –1.99 cm c. + 30.6 cm d. + 159 cm e. + 4.80 cm
The boiling point of 1,4-butanediol is 230°C. Would you expect this compound to be soluble or insoluble in room-temperature water?
A) Since there are no polar areas on this molecule, it is insoluble in water at room temperature. B) A high boiling point means that the substance interacts with itself quite strongly. Therefore this molecule is not soluble in water. C) Since there are polar areas on this molecule, it is insoluble in water at room temperature. D) Water would be attracted to both ends of 1,4 butanediol, and it is infinitely soluble in water.