A camera has a lens that has an adjustable film distance used for focusing purposes. When the object being photographed is at a very large distance, the distance from the lens to the film is 50.0 mm. What would be the lens-to-film distance for an in-focus object 2.00 m from the camera?
a. 66.7 mm
c. 51.3 mm
b. 40.0 mm
d. 48.8 mm
C
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A 100-g cube of ice is heated from -120°C to +120°C. In which of the following processes is the greatest amount of energy absorbed by this material?
a. warming ice to the melting point b. melting the ice to become water c. warming the resulting water d. vaporizing the water to become steam e. heating the steam
A flywheel is used to minimize changes in rotational velocity as the torque or the load changes. The rotational inertia of a flywheel should be chosen to be
A. as small as possible. B. as large as possible. C. anything-it doesn't matter.
One watt is
a) equal to one kilogram per second. b) the power that can be delivered by an average horse. c) the same as one-foot pound per second. d) the proper replacement unit for one joule per second.
Two speakers are emitting coherent sound waves at a frequency of 440 Hz. If the speed of sound is 343 m/s, and it is observed that no sound is heard a distance of 17.2 m from one speaker, which of the following is a possible distance to the second speaker?
A. 14.6 m B. 17.2 m C. 19.6 m D. 18.8 m E. 16.5 m F. 18.0 m