The surface tension of water is 0.0730 N/m. What is the height of the water in a capillary tube of diameter 2.00 mm?
A. 1.27 cm
B. 1.37 cm
C. 1.49 cm
D. 1.58 cm
E. 1.63 cm
C. 1.49 cm
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Two very small spherical metal objects, each with 1 Coulomb of charge, are brought together in a vacuum so that the separation distance between their centers is 1 mm. What is the force of repulsion between the two objects? (Coulomb's constant is k=9.0 × 109 N.m2/C2.)
A. 9 × 1014 N B. 9 × 1015 N C. 9 × 1012 N D. 9 × 1013 N
The Doppler effect states that the motion of any object can
a. shift the wavelength of spectral lines. b. change the speed of light emitted from the object. c. enhance the chemical composition of the object. d. make the object appear hotter. e. make the object appear cooler.
A 300 T urn coil of area 25 cm2 is placed in an 80 mT magnetic field. If the coil carries a current of 3.3 A, what is the magnitude of the maximum magnetic torque it could experience?
A. 20 N·m B. 6.0 N·m C. 0.13 N·m D. 0.20 N·m E. 0.060 N·m
Heat Engines: A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A. 57% B. 30% C. 70% D. 43%