A car runs into a brick wall. The collision pushes in the car’s front end about a meter. Is the work done on the car by the contact interaction between it and the wall positive, negative, or zero?
A. Positive
B. Negative
C. Zero
D. One needs more information to answer.
C. Zero
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Specific Heat: In a flask, 114.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4186 J/kg ? K.
A. 71 s B. 4.1 s C. 17 s D. 320,000 s
Light travels from crown glass, with a refractive index of 1.52, into water, having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles?
A) 42° B) 48° C) 53° D) 57° E) 61°
A supercluster is a ________.
A. group of open star clusters B. cluster of several dozen galaxy clusters C. group of globular star clusters D. All of these choices are correct.
Vector V1 is (5i + 7j - 3k), vector V2 is (7i + 2j + 14k), and vector V3 is (i - 2j + 5k). The scalar triple productV1*( V2 x V3) is:
(A) -91 (B) 82 (C) 56 (D) 91