Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity 
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
?
?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs t.
e
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Suppose you lived at Earth's equator. Which of the following statements would not be true?
A) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby). B) The south celestial pole is directly on your horizon, due south. C) Every day of the year, the Sun is above your horizon for 12 hours and below it for 12 hours. D) The celestial equator goes through your sky from due east on your horizon, through 50° altitude in the south, to due west on the horizon. E) No stars are circumpolar.
A Boeing 737 airliner has a mass of 20 000 kg and the total area of both wings (top or bottom) is 100 m2 . What is the pressure difference between the top and bottom surface of each wing when the airplane is in flight at a constant altitude?
a. 1 960 N/m2 b. 3 920 N/m2 c. 7 840 N/m2 d. 4 560 N/m2 e. 3 070 N/m2
The unified model describes active galactic nuclei using
a. a super massive black hole at the center of a normal spiral galaxy. b. a super massive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.
The main fuel for producing energy in the center of the sun is
A) helium. B) hydrogen. C) uranium. D) any radioactive material. E) oxygen.