A 1.5m long dowel is pivoted about the end so that it is a pendulum of sorts - it can freely swing in a vertical plane. At the other end of the dowel is a brass weight having mass 1.5kg. (The center of the brass weight is 1.5m from the pivot point. When the rod is positioned in its swing such that its angle with the vertical is 22.5 degrees, what is the torque on the rod about the pivot due to the presence of the brass weight?
A. 8.4Nm
B. 22 Nm
C. 20 Nm
D. 9.1 Nm
A. 8.4Nm
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RLC Circuits: A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor, and a 200-? resistor. What is the rms value of the current in this circuit?
A. 1.5 A B. 0.48 A C. 2.5 A D. 3.5 A E. 0.59 A
Projectile motion is characterized by
A. constant velocity in the x direction and constant acceleration in the y direction B. constant acceleration in both the x and y directions C. constant velocity in both the x and y directions D. constant acceleration in the x direction and constant velocity in the y direction
A Young's double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any?
a. The separation stays the as it is the same experiment independent of the medium. b. The separation decreases because the frequency of the light decreases in the water. c. The separation increases because the wavelength of the light increases in the water. d. The separation decreases because the wavelength of the light decreases in the water.
A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the
instant the 2.0-kg mass passes through its low point? a. 1.7 rad/s b. 2.2 rad/s c. 2.0 rad/s d. 1.5 rad/s e. 3.1 rad/s