A rod attached to the shaft of a motor at the center of the rod so that the rod is perpendicular to the shaft, as in figure a. The motor is turned on and performs work W on the rod, accelerating it to an angular speed ?. The system is brought to rest and the attachment to the rod is then moved along the shaft such that the rod is spun from its end instead, as in figure b. If the controls of the
motor are adjusted such that the rod is accelerated from rest to the same angular speed of ? in this new configuration, how much work does the motor do on the rod in this case?
4
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The players on Survivor need to start a fire to cook their food. One team member is farsighted, another is nearsighted. Whose glasses should they use to focus sunlight on the tinder?
A. The nearsighted person's. B. The farsighted person's. C. Either of them would work.
The standard unit of force used by the scientific community is the newton (N). A newton is comprised of a
- kg m/s.
- kg m2/s2.
- kg m2/s.
- kg m/s2.
The energy of a body moving across a horizontal surface is an example of kinetic energy
a. True b. False Indicate whether the statement is true or false
Magnifying Glass With the Image at Infinity: A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A. 5.0 B. 3.0 C. 4.0 D. 1.0 E. 2.0