For every 100 gallons of gasoline you use in your car, the amount that actually goes into moving the car down the road is roughly
A) 10 gal. B) 50 gal. C) 2 gal. D) 98 gal. E) 75 gal.
A
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Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T
Light of intensity I0 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizontal, but the second one is oriented 20.0° to the horizontal. In terms of I0, what is the intensity of the light that passes through the set of polarizers?
A) 0.780I0 B) 0.180I0 C) 0.442I0 D) 0.883I0
Suppose the star Betelgeuse (the upper left shoulder of Orion) were to become a supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. B) Because the supernova event destroys the star, Betelgeuse would suddenly disappear from view. C) Betelgeuse would remain a dot of light but would suddenly become so bright that, for a few weeks, we'd be able to see this dot in the daytime. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full moon. It would also be about as bright as the full moon.
A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2 . Determine the tension in the string
a. 11 N b. 70 N c. 48 N d. 59 N e. 62 N