Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration

A) is less than it will be a short instant later.
B) is zero.
C) reverses direction.
D) is g.
E) is 2?g.


D

Physics & Space Science

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A. are gaps in space, containing no matter. B. are predicted by Einstein's special theory of relativity. C. are the collapsed remnant of giant stars. D. cannot be detected in binary star systems. E. are a violation of Einstein's general theory of relativity.

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Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0). What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?

A. 3.8 mT B. 2.7 mT C. 2.9 mT D. 3.0 mT E. 0.6 mT

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The fourth planet from the Sun is ______________

Fill in the blank(s) with correct word

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As a star like the Sun exhausts hydrogen in its core, the outer layers of the star

a. become hotter and more luminous. b. become cooler and more luminous. c. become hotter and less luminous. d. become cooler and less luminous. e. become larger in radius and hotter.

Physics & Space Science