An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is 30. cm. (a) Where is the image formed? (b) How tall is it?
What will be an ideal response?
(a) 13 cm behind the mirror
(b) 1.1 cm tall
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Household wiring is made with
A. conductors inside insulators. B. insulators inside conductors. C. semiconductors inside conductors. D. semiconductors inside insulators. E. semiconductors inside insulators inside conductors.
Which of the following statements about the celestial equator is true at all latitudes?
A) It extends from your horizon due north, through your zenith, to your horizon due south.
B) It cuts the dome of your local sky exactly in half.
C) It represents an extension of Earth's equator onto the celestial sphere.
D) It lies along the band of light we call the Milky Way.
E) It extends from your horizon due east, through your zenith, to your horizon due west.
If the length of a box is reduced by one-third and the width and height are doubled, by what factor has the volume changed?
A. 4/3 B. 2/3 C. 3/4 D. 3/2
Thermodynamic Devices: An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it use to remove 2000 J of heat from the interior of the house?
A. 105 J B. 130 J C. 780 J D. 520 J E. 340 J