A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 72 dB to 47 dB
The factor, by which the acoustic power entering the chamber is reduced by the glass window, is closest to: A) 3.2 × 10-3
B) 2.2 × 10-2
C) 5.6 × 10-2
D) 1.0 × 10-1
E) 1.5 × 10-1
A
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Each of two vectors, 
and 
, lies along a coordinate axis in the xy plane. Each vector has its tail at the origin, and the dot product of the two vectors is 
data-wiris-created="true" class="Wirisformula" />. Which possibility is correct? A.
and both lie along the positive x axis.B.
lies along the positive x axis. lies along the negative x axis.C.
and both lie along the positive y axis.D.
lies along the negative x axis. lies along the negative y axis.E.
lies along the positive y axis. lies along the negative x axis.A large mass-to-light ratio for a galaxy indicates that
A) the galaxy is very massive. B) the galaxy is not very massive. C) on average, each solar mass of matter in the galaxy emits less light than our Sun. D) on average, each solar mass of matter in the galaxy emits more light than our Sun. E) most stars in the galaxy are more massive than our Sun.
A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s, during which time she is swept downstream 480 m
(a) How fast can she swim in still water? (b) What is the speed of the current?