Quito, Ecuador, is at an altitude of 2,850 meters above sea level, while New York City is at sea level. If you are preparing a hard-boiled egg in Quito, it would have to be placed in boiling water
A)
for the same amount of time as in New York.
B)
for a shorter time than in New York.
C)
for a longer time than in New York.
D)
There is not enough information to answer this question.
C
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A 4.0-cm tall object is placed along the principal axis of a thin, convex lens of 30.0-cm focal length. If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively?
a. 17.3 cm and 7.0 cm c. 120 cm and 1.3 cm b. 17.3 cm and 1.3 cm d. 120 cm and 12 cm
The following objects are sitting on a table, one meter above the floor. Which object will have the most potential energy?
a. a pea b. a tomato c. a grape d. a watermelon
What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of –16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30° above the horizontal and the tension in the rope is 50 N. What is the coefficient of friction?
a. 0.35 c. 0.16 b. 0.29 d. 0.20