How far from a converging lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
20 cm
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A mercury manometer measures a pressure of 150 mmHg. What is this pressure in kPa?
A. 12 B. 15 C. 20 D. 24 E. 29
Two unknown resistors A and B are connected together. When they are connected in series their combined resistance is 15 ?. When they are connected in parallel, their combined resistance is 3.3 ?. What are the resistances of A and B?
A) 15 ? and 5 ? B) 5 ? and 10 ? C) 2.5 ? and 5 ? D) 32? and 20 ? E) 10 ? and 30?
A bar magnet is held near a single closed loop of wire. The magnet is aligned with the loop axis, and the north pole is facing the loop. If the magnet is moved away, the current induced in the loop will be in a ________ direction as viewed from the side the magnet is on.
Fill in the blank(s) with the appropriate word(s).
Northern Hemisphere winters are colder than Northern Hemisphere summers because
a. Earth is closer to the sun during the summer than it is during the winter. b. the snow that falls in the northern latitudes cools Earth during the winter. c. the light from the sun shines more directly on the Northern Hemisphere during the summer. d. the period of sunlight is longer during the summer than during the winter. e. c and d