How fast would a rocket ship have to move past Earth to contract to half of its proper length as observed by an Earth-based physicist?
What will be an ideal response?
0.87c
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Knowing that the atomic number of neon is greater than that of helium, at the same temperature and pressure, how does the speed of sound in helium gas compare to the speed of sound in neon gas?
A) greater in neon than in helium B) greater in helium than in neon C) the same in both gases D) depends on the frequency of the sound generated
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
Determine the heat transfer and fin efficiency for a copper fin shown in Figure 2-72. The fin can be assumed to be very long and its base temperature taken as 200ºF.
A car is moving down a freeway in a straight line at a constant rate of 32.0 m/s for 3.0 s. Its acceleration is
a. 9.8 m/s2. b. 9.8 m/s. c. zero. d. 32.0 m/s. e. 11.0 m/s2.