An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer, then what is the frequency of the siren perceived by the observer?
A. 2,375 Hz
B. 2,306 Hz
C. 2,266 Hz
D. 2,244 Hz
E. 2,210 Hz
D. 2,244 Hz
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Impulse: A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms. What is the magnitude of the average force exerted by the bat on the ball?
Fill in the blank(s) with the appropriate word(s).
An astronaut on a strange new planet finds that she can jump up to a maximum height of 27. meters when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of gravity on the planet?
What will be an ideal response?
Exhibit 5-2
A 4.00-kg block is suspended from the roof of an elevator. A 2.00-kg block is suspended from the 4.00-kg block. The tensions in strings 1 and 2 are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . When the elevator accelerates downwards with an acceleration of 2.20 m/s2, the magnitudes of 
and 
are
A. 30.4 N; 15.2 N.
B. 39.2 N; 19.6 N.
C. 45.6 N; 15.2 N.
D. 48.0 N; 24.0 N.
E. 72.0 N; 24.0 N.
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