A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.10 cm cos(2000 rad/s t + 40.0 
x). What is the velocity of the wave?
A. 500 m/s in the + x direction
B. 500 m/s in the - x direction
C. 200 m/s in the + x direction
D. 200 m/s in the - x direction
B. 500 m/s in the - x direction
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Acceleration: A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.
A. 0.30 m/s2, south B. 2.7 m/s2, south C. 0.30 m/s2, north D. 2.7 m/s2, north
Two important properties of young pulsars are
A. rapid rotation and no magnetic field. B. extremely rapid rotation and a weak magnetic field. C. no rotation and strong magnetic field. D. extremely rapid rotation and a strong magnetic field. E. no rotation and no magnetic field.
A ball at the end of a string is swinging as a simple pendulum. Assuming no loss in energy due to friction, we can say for the ball that
A. the kinetic energy does not change but the potential energy does. B. the mechanical energy changes and is maximum where the kinetic energy is minimum. C. the potential energy is maximum at each end of the motion. D. the mechanical energy changes and is maximum where the kinetic energy is maximum.
Three resistors, 90 ?, 40 ?, and 60 ?, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?
a. 190 ? b. 19 ? c. 0.053 ? d. 216000 ?