An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height
a. 64 m
b. 48 m
c. 32 m
d. 96 m
e. 75 m
d
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The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.80c with respect to the inertial frame of reference?
a. 1.6 s c. 2.5 s b. 1.2 s d. 3.3 s
Polypropylene has _________strength at elevated temperatures than PE does.
Fill in the blank(s) with the appropriate word(s).
Wire A carries 4 A into a junction, wire B carries 5 A into the same junction, and another wire is connected to the junction. What is the current in this last wire?
A. 4 A away from the junction B. 9 A away from the junction C. 4 A into the junction D. 9 A into the junction E. 1 A away from the junction
Why do you think air is such a poor conductor com-pared to a metal (at normal field strengths)?
A. Air is much less dense than a metal. B. Electrons can travel much farther in a metal before col-liding with an atom than they can in air. C. Air molecules are much bigger than metal atoms. D. Electrons move much more slowly in air. E. Air normally has very few free charge carriers.