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Marina CMI [18]
3 years ago
14

50 The emissivity of galvanized steel sheet, a common roofing material, is s = 0.13 at temperatures around 300 K, while its abso

rptivity for solar irradiation is aS = 0.65. Would the neighborhood cat be comfortable walking on a roof constructed of the material on a
(
a. If a dryer is designed to operate with an electric power consumption of Pelec = 500 W and to heat air from an ambient temperature of Ti = 20°C to a discharge temperature of To = 45°C, at what volu- metric flow rate 'e should the fan operate? Heat loss from the casing to the ambient air and the surround- ings may be neglected. If the duct has a diameter of D = 70 mm, what is the discharge velocity Vo of the air? The density and specific heat of the air may
day when GS = 750 W/m2, T00 = 16°C, and h = 7

W/m2 · K? Assume the bottom surface of the steel is

insulated.
be approximated as p = 1.10 kg/m3 and cp

J/kg · K, respectively.
Physics
1 answer:
denis-greek [22]3 years ago
4 0
Since the power is already given together with the initial and final temperature, the heat by convection and conduction should be determined.
Heat by convection can be determined using
qh = hAΔT
and the conduction is
qc =kAΔT
Which can be combined to determine the flow rate of air using
mcpΔT
and the mass flow rate can be converted to volumetric flowrate using the specific gravity of the air.
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what is the the wavelength if a wave cycles up and down three times per second and the distance between each wave is 1.7m?
DENIUS [597]

Answer:5.1 meters

Explanation:

wavelength=3 x1.7

Wavelength=5.1 meters

8 0
3 years ago
Which special effects technique is being used in television weather reports in which meteorologists stand in front of moving map
Pachacha [2.7K]
A. cgi... they're usually filmed with a greenscreen and is keyed out in editing. known as chroma keying
6 0
3 years ago
Read 2 more answers
What state of matter can easily be compressed (squeezed into a much smaller space)? *
avanturin [10]

Answer:

gases.

Explanation:

gases have the highest volume. if you compress (increase pressure) a gas, the volume decreases and it will take up less space as a liquid, and if you compress more, the liquid will become a solid.

additionally info: this is generally true, but as you get into more difficult subjects, this rule does not hold. for example, some substances cannot obtain a certain phase of matter when they are a certain temperature and or pressure. but that could be way more out of this questions league.

6 0
3 years ago
If an object is projected upward with an initial velocity of 127 ft per? sec, its height h after t seconds is h equals negative
Stolb23 [73]
To determine the height of the object given the time, we simply use the given relation between height and time in the problem statement. It is given as:

h = -16t^2 + 127t

We substitute 55 seconds to t and obtain,

h = -16(55)^2 + 127(55)
h = - 41415
4 0
3 years ago
A 22 µF capacitor charged to 0.7 kV and a second 115 µF capacitor charged to 5.5 kV are connected to each other, with the positi
vesna_86 [32]

Answer:

0.099C

Explanation:

First, we need to get the common potential voltage using the formula

V=\frac {C_2V_2-C_1V_1}{C_1+C_2}

Where V is the common voltage, C and V represent capacitance and charge respectively. Subscripts 1 and 2 to represent the the first and second respectively. Substituting the above with the following given values then

C_1=22\times 10^{-6} F\\ C_2=115\times 10^{-6} F\\ V_1= 0.7\times 10^{3}\\V_2=5.5\times 10^{3}

Therefore

V=\frac {115\times 10^{-6}\times 5.5\times 10^{3}-22\times 10^{6}\times 0.7\times 10^{3}}{22\times 10^{-6}+115\times 10^{-6}}=4504.3795620437

Charge, Q is given by CV hence for the first capacitor charge will be Q_1=C_1V

Here, Q_1=22\times 10^{-6}\times 4504.3795620437=0.0990963503649C\approx 0.099C

8 0
3 years ago
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