A point on the rim of a 0.30-m radius rotating wheel has a tangential speed of 4.0 m/s. What is the tangential speed of a point 0.10 m from the center of the same wheel?
a. 1.0 m/s
c. 2.7 m/s
b. 1.3 m/s
d. 8.0 m/s
B
You might also like to view...
Imagine looking at the face of a CRT. The bright spot where the electron beam hits that face is exactly in the screen’s center. You bring a permanent magnet toward the body of the CRT vertically from above. The magnet is oriented vertically with its north pole downward. In what direction will the spot deflect?
A. Up B. Down C. The spot does not deflect. D. Right E. Left F. Some other direction (specify)
When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation. b. can be decreased by shifting mass out away from the axis of rotation. c. can be increased by shifting mass in toward the axis of rotation. d. can be decreased by shifting mass in toward the axis of rotation. e. cannot be changed except by friction at the point of contact.
Which wavelength band uses observatories on aircraft?
a. ultraviolet b. visual c. infrared d. X-ray
Coulomb's Law: A point charge Q = -12 ?C, and two other charges q2 and q2, are placed on x-y axes as shown in the figure. The electric force components on charge Q are Fx = +0.005 N and Fy = -0.003 N. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 .C(a) How many excess electrons are there in charge Q?(b) What are the charges q1 and q2, including their signs?
What will be an ideal response?