The deuterium in distant quasars and in the interstellar medium suggests that the universe is open
Indicate whether the statement is true or false
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A student lifts a weight of 10.0 N a distance of 0.5 meters. If this exercise is repeated 50 times in 100 seconds, then the power of this exercise is
A. 2.5 Watts. B. 3.1 Watts. C. 3.6 Watts. D. 4.0 Watts. E. 4.8 Watts.
Determine the total frozen fraction after 60 minutes of cooling if the tubes are in a staggered arrangement instead of the in-line arrangement.
What will be an ideal response?
A point charge (?5.0 ?C) is placed on the x axis at x = 4.0 cm, and a second charge (+5.0 ?C) is placed on the x axis at x = ?4.0 cm. What is the magnitude of the electric force on a third charge (+2.5 ?C) placed on the y axis at y = 3.0 cm?
a. 90 N b. 45 N c. 54 N d. 72 N e. 36 N
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
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Exhibit 3-4
The diagram below shows the path taken by a sailboat tacking sideways because it cannot sail directly into the wind.
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?
Use this exhibit to answer the following question(s).
Refer to Exhibit 3-4. The total displacement of the sailboat, the vector sum of its displacements OB, BC, CD and DE, is
A. 1732 m, East.
B. 2000 m, Northeast.
C. 6298 m, East.
D. 8000 m, Southeast.
E. 8000 m, East.