An unmarked resistor is being used in a circuit. To determine its resistance by making voltage and current measurements, one should connect
A. the voltmeter and ammeter in series with the resistor.
B. the voltmeter and ammeter in parallel with the resistor.
C. the voltmeter in parallel with the resistor, and the ammeter in series with the resistor.
D. the voltmeter in series with the resistor, and the ammeter in parallel with the resistor.
Answer: C
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A heat conducting rod, 0.90 m long, is made of an aluminum section that is 0.10 m long, and a copper section that is long
Both sections have cross-sectional areas of The aluminum end is maintained at a temperature of and the copper end is at The thermal conductivity of aluminum is 205 W/m ? K and of copper is 385 W/m ? K. Steady state has been reached, and no heat is lost through the well-insulated sides of the rod. The temperature of the aluminum-copper junction in the rod is closest to A) 61°C. B) 58°C. C) 56°C. D) 54°C. E) 52°C.
A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and and the block to the same high temperature and removes the pin easily
What statement relates the coefficient of thermal expansion of material A to that of material B? A) Material B has a greater coefficient of expansion than does material A. B) The situation is not possible, heating block B will shrink the hole in the material as the material expands with increasing temperature. C) Material B has the same coefficient of expansion as does material A. D) Material B has a negative coefficient of expansion and A has a positive coefficient of expansion. E) Material A has a greater coefficient of expansion than does material B.
A person of mass 50. kg has a wavelength of 4.42 × 10-36 m when running. How fast is she running?
A) 4 m/s B) 1 m/s C) 3 m/s D) 2 m/s E) 5 m/s
A billiard ball is moving in the x-direction at 33.4 cm/s and strikes another billiard ball moving in the y-direction at 38.9 cm/s. As a result of the collision, the first ball moves at 50.6 cm/s, and the second ball stops. In what final direction does the first ball move?
a. in the x-direction b. at an angle of 49.4° ccw from the x-direction c. at an angle of 40.6° ccw from the x-direction d. at an angle of 56.6° ccw from the x-direction e. Such a collision cannot happen.