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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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.
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).
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.
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