The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward
b. 1.2 m/s2 upward
c. 1.2 m/s2 downward
d. 10 m/s2 upward
e. 2.4 m/s2 downward
b
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A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
What is the frequency of the vibration of the wave?
A. 490 Hz B. 467 Hz C. 422 Hz D. 398 Hz E. 302 Hz
A 2000 kg car is traveling on a banked curved icy road without sliding. The velocity of the car is 32.0 m/s and the road is banked at an angle of 20.0 degrees. The radius of curvature of the road is
A. 125 m. B. 210 m. C. 287 m. D. 310 m. E. 350 m.
A bicycle pump contains air at one atmosphere and 0°C. As the tire is pumped up, the volume of air decreases by 50% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change?
A. 2 B. 1 C. 0.5 D. 0.1 E. 3
How are radio waves generated? How are they detected? What do you think limits the highest radio frequency that can be generated?