When heating a liquid in a test tube, the test tube should be no more than one-thirds full, moved continuously in and out of the flame at a 45⁰ angle. True or False
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- Two long parallel 20-cm-diameter cylinders are located 30 cm apart from each other. Both cylinders are black, and are maintained at temperatures 425 K and 275 K. The surroundings can be treated as a blackbody at 300 K. For a 1-mlong section of the cylinders, determine the rates of radiation heat transfer between the cylinders and between the hot cylinder and the surroundings.About how hot does something have to get to glow red hot? a.375 degrees F b.800 degrees F c.3000 K d.6000 KThe air temperature was 72.60° F during a thunderstorm, and thunder was timed 7.65 s after lightning was seen. How many feet away was the lightning strike?
- In relation to incoming radiation, which surface would receive the most heat? a. the surface that is perpendicular to the radiation b. the surface that is parallel to the radiation c. the surface that is angled towards the radiation d. the surface that is angled away from the radiationA vertical glass tube of length L = 1.280 000 m is half filled with a liquid at 20.000 000C. How much will the height of the liquid column change when the tube and liquid are heated to 30.000 000C? Use coefficients aglass = 1.000 000* 10-5/K and bliquid = 4.000 000* 10-5/K.Suppose you have a sphere with a surface area of about 1.3 m2. If the temperature of the sphere were 373 K, what would be the power emitted from the sphere? Assume the sphere is a blackbody.
- What is the lowest temperature that will cause a blackbody to emit radiation that peaks in the infrared for each of the following? (Take the infrared band to lie between 0.3 mm and 0.00075 mm, where the middle of the band is its arithmetic mean.) extreme low end of the infrared band middle of the infrared band extreme high end of the infrared b All answers should be in KThe energy reaching Earth from the Sun at the top of the atmosphere is 1.36x10^3 W/m2, called the solar constant. Assuming that Earth radiates like a blackbody at uniform temperature, what do you conclude is the equilibrium temperature of earth is?A giant, hot (323oC) sphere of copper is placed into the middle of Space where it radiates heat as a black body radiator. The sphere has a radius of 0.50 meters and a mass of 4660 kg. Assuming copper has emissity of 0.8, how long will it take for the giant ball of carbon to drop 2oC (Csp=0.385 J/g*C =385 kJ/Kg*C)
- An aluminum cup with mass 0.56 kg holds 0.96 kg of water. Both the cup and the water have a temperature of 10.°C. If a 0.76-kg piece of copper at 53.°C is added to the cup, what is the final equilibrium temperature in °C? You may assume that the cup, water, and copper are well insulated from anything else.When heating a liquid in a test tube, the test tube should be more than two-thirds full, moved continuously in and out of the cool flame at a 45 deg angle, mostly near the top of the liquid. * False TrueIf a blackbody is radiating at T=1330 K at what wavelength is the maximum intensity?