A toaster, sketched in the figure, has two heating elements on either side of a slice of bread when toasting the bread. The element temperature is 450ºC and its emissivity is 0.85 when bread is toasted. If the bread is at 100ºC, the bread’s emissivity is 0.65, and the surroundings reradiate heat, determine the net heat transfer to the bread.
What will be an ideal response?
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Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. Determine
(a) the frequency of the light in the liquid. (b) the wavelength of the light in the liquid.
A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box
The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? A) 250 N B) 200 N C) 32 N D) 620 N E) 220 N
Water flows in the horizontal pipe shown in Fig. 13-6. At A the diameter is 5.00 cm and at B the diameter is 4.00 cm
The fluid in the manometer is mercury, which has a density of 13,600 kg/m3. The manometer reading h is 4.40 cm. What volume of water is flowing through the pipe per second? A) 0.0206 m3/s B) 0.0426 m3/s C) 0.00560 m3/s D) 0.372 m3/s E) 0.186 m3/s
Reverse faults are the result of
A) tension. B) compression. C) divergence. D) heat.