Vision Problems: The near point of a farsighted person is 65 cm. What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?
A. -4.2 diopters
B. -2.5 diopters
C. -2.4 diopters
D. +4.2 diopters
E. +2.5 diopters
Answer: E
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Angular Momentum: A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s. Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on?
A. 0.20 rad/s B. 0.40 rad/s C. 0.60 rad/s D. 0.80 rad/s E. 0.67 rad/s
When a rigid body rotates about a fixed axis all the points in the body have the same angular displacement
Indicate whether the statement is true or false
For the multiplication of 2.817 m divided by 6.3 m, the result should be reported with how many significant figures?
a. Two b. One c. Three d. Four e. Seven
In general, what can be said about type O and B stars compared to type K and M stars?
A) They are hotter and younger. B) They are cooler and older. C) They are cooler and younger. D) They are hotter and older. E) They are neither hotter nor cooler, younger nor older.