A stature that is 3.0 cm tall statue is 24 cm in front of a concave mirror. The magnitude of the radius of curvature of the mirror is 20 cm
(a) Is the image real or virtual?
(b) How far is the image from the mirror?
(c) Is the image upright or inverted?
(d) How tall is the image?
(a) real (b) 17 cm (c) inverted (d) 2.1 cm
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Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.
Atmospheric pressure does NOT correspond to approximately
A) 0.1 MPa. B) 1.0 × 102 N/m2. C) 2.2 × 103 lb/ft2. D) 2.4 × 102 oz/in2. E) 15. lb/in2.
Two parallel straight wires carry currents in the same direction. The magnetic forces between the wires are such that
A) the wires feel a clockwise torque. B) they are pulled in the direction of the wires. C) the wires repel each other. D) the wires attract each other.
Which explanation best describes why Earth observers always see the same face of the moon?
A) The Moon's rate of spin matches the rate at which the Moon revolves around Earth. B) The Moon does not rotate as it circles Earth. C) We tend only to observe the Moon at night, not during the day. D) Earth and Moon are partially gravity locked.