Estimation: A reasonable estimate for the duration of a typical physics lecture is

A. 600 s.
B. 1000 s.
C. 3500 s.
D. 10,000 s.


Answer: C

Physics & Space Science

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Indicate whether the statement is true or false

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When material expanding away from a star in a binary system leaves a star's Roche lobe,

a. the material will start to fall back toward the star. b. all of the material will accrete on to the companion. c. the material is no longer gravitationally bound to that star. d. the material will increase in temperature an eventually undergo thermonuclear fusion. e. c and d.

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Lenz's Law: The three loops of wire shown in the figure are all hanging in the same uniform magnetic field  that is perpendicular to the page and does not vary with time. Loop 1 swings back and forth like the bob in a pendulum, Loop 2 rotates about a vertical axis, and Loop 3 oscillates up and down at the end of a spring. Which loop (or loops) will have an emf induced in them?

A. Loop 1 B. Loop 2 C. Loop 3 D. Loops 1 and 3 E. Loops 2 and 3

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