Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?
A) 0.3 m/s2
B) 3.0 m/s2
C) 10 m/s2
D) 30 m/s2
E) 300 m/s2
Answer: B
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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
The sky is blue because molecules scatter blue light more effectively than red light
Indicate whether the statement is true or false
Which of the following is not a meson?
a. the phi c. the pion b. the kaon d. All of the above are mesons.
A fundamental force in nature is the
a. strong interaction b. weak interaction c. electromagnetic interaction d. gravitational interaction e. all of the above