When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin converging lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?
at infinity
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Radioactive Decay: An air sample is contaminated with 15O, which has a half-life of 2.03 minutes. You can pass it through a long pipe to allow it to decay until it can be safely released into the atmosphere. If the speed of the gas in the pipe is 1.1 m/s, how long must the pipeline be for the sample to decay to 3.0% of its original activity?
A. 680 m B. 8.0 m C. 72 m D. 250 m
Star A has an apparent magnitude of 3 and Star B has an apparent magnitude of 5. Which star is brighter in our sky?
A) Star A B) Star B C) The two stars have the same brightness in our sky, but Star A is closer to us than Star B. D) There is not enough information to answer the question.
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.
A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass (or center of gravity) of the man-board system?
A) 1.25 m B) 2.50 m C) 5.00 m D) 7.50 m E) 9.00 m