A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN
b. 2.1 mN
c. 5.3 mN
d. 4.2 mN
e. 6.0 mN
b
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Carnot Engine: The "hot shot" heat engine operating between 40°C and 380°C has an efficiency that is 60% of that of an ideal Carnot engine operating between the same temperatures. If the "hot shot" engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
A. 36 kW B. 41 kW C. 57 kW D. 60 kW
Multiplying a 4 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures?
a. 7/6 c. 2 b. 3 d. 13
Consider two blinking warning lights 3000 m apart along a railroad track. These lights flash simultaneously in the ground frame. Let W be the event of the west light blinking, and let E be the event of the east light blinking. A train moves eastward along the track at a relativistic speed ?. Suppose an observer in the train passes the west light just as event W happens. By carefully measuring when the light from event E arrives and calculating the distance between the two lights (by observing how long it takes to travel between the lights at the known speed ?), the observer is able to infer when event E actually happened in the train frame. The observer concludes that
A. Event W happened before event E in the train frame. B. Events W and E were simultaneous in the train frame. C. Event E happened before event W in the train frame. D. One cannot determine unambiguously which event occurs first in the train frame.
Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room
A) blocks of foam plastic. B) large tubs of water. C) an ample supply of fire wood. D) none of the above