A 200. ? resistor is rated at 1/4 W
(a) What is the maximum current it can draw?
(b) What is the maximum voltage that should be applied across it?
(a) 35.4 mA
(b) 7.07 V
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What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T ? m/
A) A) 7.3 × 10-5 J/m3 B) 3.7 × 10-5 J/m3 C) 3.6 × 10-4 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.
A satellite in an elliptical orbit travels at a
1) constant speed 2) variable speed 3) not enough information to say because 4) the net force acting on it is zero. 5) of the component of gravitational force existing in its direction of motion. 6) it is characteristic of it to do so. 7) again, not enough information is given to say.
The totally eclipsed Moon glows coppery red because sunlight reaches the Moon's surface after passing through Earth's atmosphere
a. True b. False Indicate whether the statement is true or false
Is it possible to see a virtual image?
A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B) No, since virtual images do not really exist. C) Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. D) Yes, but only by using an additional lens to form a real image before the light reaches the eye.