An object is placed on an optical bench. A lens with a focal length of 12 cm is placed 20 cm from the object. Where should a second lens, with a focal length of 4.0 cm, be placed if a total magnification +6 is to be obtained?
A)
20 cm from the first lens
B)
35 cm from the first lens
C)
40 cm from the first lens
D)
30 cm from the first lens
E)
25 cm from the first lens
B
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If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter?
a. must be equal in magnitude to that on M b. must be negative c. must be positive d. must be greater in magnitude than that on M
A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron-proton system
A) increases. B) decreases. C) remains the same. D) depends on the zero point of the potential.
The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A) 15.0 m B) 30.0 m C) 375 m D) 750 m
What does "carrying capacity" mean? Some have defined it as "the number that can be supported long term without damage to the environment." Is this a reasonable definition? Why or why not?
What will be an ideal response?