Fundamental Forces: Inside the nucleus, the weakest of the four fundamental forces is
A. the weak nuclear force.
B. the electromagnetic force.
C. the gravitational force.
D. the strong nuclear force.
Answer: C
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Vision Problems: What power (in diopters) of corrective contact lens is required to correct the vision of a myopic eye whose far point is at 170 cm?
Fill in the blank(s) with the appropriate word(s).
A long cylindrical wire (radius = 2.0 cm) carries a current of 40 A that is uniformly distributed over a cross section of the wire. What is the magnitude of the magnetic field at a point which is 1.5 cm from the axis of the wire?
a. 0.53 mT b. 28 mT c. 0.30 mT d. 40 mT e. 1.9 mT
If the universe is flat
a. its age will be equal to 1/H. b. its age will be equal two-thirds of 1/H. c. the density of the universe is less than the critical density. d. the density of the universe is greater than the critical density. e. dark matter accounts for a small fraction of the density of the universe.
Photos A and B both show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?
A) Photo A is the visible-light photo, and we can tell because dust in the molecular cloud absorbs visible light, making the cloud appear dark. B) Photo A is the visible-light photo because its stars are more colorful. C) Photo B is the visible-light photo because more stars are visible in the molecular cloud. D) Photo B is the visible-light photo because the molecular cloud has a reddish tint.