Three measurements are made of the x-component velocity in the diffuser of an incompressible plane flow to be 32 m/s, 28 m/s and 20 m/s. The measurement points are along the centerline of the symmetrical diffuser and are 4 cm apart. The y-component of the velocity 2 cm above the centerline is approximated to be:
(A) 2 m/s
(B) 3 m/s
(C) 4 m/s
(D) 5 m/s
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A light bulb with a tungsten filament is attached to a source of variable voltage. As the voltage is increased on the bulb,
a. the bulb's resistance decreases. b. the bulb's resistance increases. c. the current in the bulb decreases. d. the power dissipated remains constant.
How much work must be done by frictional forces in slowing a 1000-kg car from 26.1m/s to rest?
A) 4.09 × 105 J B) 3.41 × 105 J C) 2.73 × 105 J D) 4.77 × 105 J
A "rainbow" appears on an oil slick or soap bubble due to:
1.refraction of light. 2.transmission of light. 3.dispersion of light. 4.interference of light. 5.scattering of light. 6.reflection of light. 7.None of the above.
A galvanometer coil having a resistance of 20 ? and a full-scale deflection at 1.0 mA is connected in series with a 4980 ? resistance to build a voltmeter. What is the maximum voltage that this voltmeter can read?
A) 3.0 V B) 1.0 V C) 50 V D) 5.0 V E) 10 V