Reflecting telescopes are no longer popular with astronomers because they are expensive and suffer from chromatic aberration
Indicate whether the statement is true or false
F
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Spherical Mirrors: An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm. Where is the image?
A. 13 cm from the mirror B. 7.0 cm from the mirror C. 4.3 cm from the mirror D. 3.3 cm from the mirror
The difference between the pressures inside and outside a tire is called
a. absolute pressure. b. gauge pressure. c. atmospheric pressure. d. psi. e. none of the above.
Suppose that we wish to find the "net force" on an automobile, in order to apply Newton's law of motion to the motion of the automobile
As part of the net force, do we need to include "internal frictional forces" due to internal gears, bearings, etc.? A) Yes, because of Newton's law of force pairs. B) No, because only external forces need to be included. C) Yes, because every internal and external force must be included. D) No, because only the drive force needs to be included. E) Yes, because these forces dissipate some of the car's energy.
During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
A. heat added to the system. B. either heat added or mechanical work done. C. mechanical work done on the system.