A pinhole cameras has no lens. The tiny pin-hole opening insures that rays of light from different parts of an object
1) overlap.
2) don't overlap.
3) bend to a focus.
Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of
4) the Sun.
5) the openings themselves.
6) both of these
7) neither of these
Answer: 2, 4
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__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere
a. Ozone b. Water vapor c. Methane d. Carbon dioxide
Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-half the diameter of the wide section. If the velocity of the incompressible fluid is 3.20 m/s in the wide section, then what is the velocity of the fluid in the narrow section?
A. 16.5 m/s B. 18.7 m/s C. 19.8 m/s D. 10.5 m/s E. 12.8 m/s
An airplane flies at a constant speed at an angle of 25 degrees above the horizontal. Which statement below is not true?
A. The net force on the plane is zero. B. The lift is the same magnitude as the weight. C. The plane has a constant velocity. D. The thrust is greater in magnitude than the drag.
A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 400 N, then what maximum speed can the mass have if the string is not to break?
a. 370 m/s c. 19 m/s b. 27 m/s d. 29 m/s