Biology

Biology, 16.09.2019 02:30, noahdeem135

How long can yogurt be left out at room temperature?

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Engineering, 04.07.2019 19:20, littlepotato10

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.

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Physics, 19.08.2019 07:30, hannaboo53

Suppose that at room temperature, a certain aluminum bar is 1. m long. the bar gets longer when its temperature is raised. the length l of the bar obeys the following relation: l=1.+2.4×10−5t, where t is the number of degrees celsius above room temperature. what is the change of the bar's length if the temperature is raised to 11.3 ∘c above room temperature? express your answer in meters to two significant figures.

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Physics, 18.09.2019 20:20, Twitches

Imagine you've been walking outside on a cold winter's day. when you arrive home at your studio apartment, you realize that you left a window open and your 5.0m×5.0m×3.0m room is only slightly warmer than the outside. you turn on your 1.0-kw space heater right away and wait impatiently for the room to warm up.in this problem, make the following assumptions: the entire 1.0kw=1.0×103j/s output of the space heater goes into warming the air in the room.the air in the room is an ideal gas with five degrees of freedom per particle (three translational degrees of freedom and two rotational degrees of freedom—about right for nitrogen and oxygen).the air in the room is at a constant pressure of 1.00 atm.at room temperature (22 ∘c= 295 k) and atmospheric pressure, 1.00 mole of air fills a volume of 24.2 l. this is slightly larger than the volume of air at standard temperature and pressure, because room temperature is hotter than 0 ∘c.how long will it be before the heater warms the air in the room by 10 ∘c? express your answer in minutes to two significant figures.

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Physics, 16.10.2019 01:10, josiesolomonn1605

Suppose that at room temperature, a certain aluminum bar is 1. m long. the bar gets longer when its temperature is raised. the length l of the bar obeys the following relation: l=1.+2.4×10−5t, where t is the number of degrees celsius above room temperature. what is the change of the bar's length if the temperature is raised to 13.0 ∘c above room temperature?

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