A parallel plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?
A)
6.00 kg/(m?s)
B)
20.0 kg/(m?s)
C)
60.0 kg/(m?s)
D)
0.200 kg/(m?s)
E)
200 kg/(m?s)
D
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An electric room heater has been designed in the shape of a vertical cylinder 2-m-tall and 30 cm in diameter. For safety, the heater surface cannot exceed 35°C. If the room air is 20°C, find the power rating of the heater in watts.
GIVEN
• An electric heater in the shape of a vertical cylinder
• Heater height (H) = 2 m
• Heater diameter (D) = 30 cm = 0.3 m
• Room air temperature (T?) = 20°C = 293 K
FIND
• The power rating of the heater (q) in watts
ASSUMPTIONS
• Radiation is negligible
• Heat transfer from the top and bottom of the tank is negligible
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 27.5°C
Thermal expansion coefficient (?) = 0.00332 1/K
Thermal conductivity (k) = 0.0256 W/(m K)
Kinematic viscosity (?) = 16.4 × 10–6 m2/s
Prandtl number (Pr) = 0.71
Which of the following is NOT true about color and visual contrast in web design?
A. Webpages can use color to evoke mood. B. Limit your website color scheme to five or six contrasting colors. C. The WAI specifies that color contrast should be sufficient for visitors using a monochrome monitor. D. One way to select an appropriate color scheme is to use a template.
The amount of heat necessary to change the temperature of 1 kg of a substance by 1°C is called the substance's
A. specific heat. B. latent heat. C. heat of combustion. D. mechanical equivalent of heat.
The classical pinwheel-shaped galaxies are ________, according to Hubble
A) spirals B) ellipticals C) irregulars D) radio lobes E) lenticulars