An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?
A. 2,640 Hz
B. 2,559 Hz
C. 2,324 Hz
D. 2,139 Hz
E. 2,003 Hz
D. 2,139 Hz
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The straight-line distance and direction between two points are, together, called
a. velocity. b. displacement. c. distance. d. acceleration.
An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
A. 0.12 ?s B. 1.2 ms C. 0.18 ?s D. 1.8 ms E. 1.8 ?s
An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
When humans get hot, they sweat in order to reduce their body temperature. Which of the key properties of life is this an example of?
A) growth and development B) reproduction C) response to environment D) order