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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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An object that weighs 2.450 N is attached to an ideal massless spring and undergoes simple harmonic oscillations with a period o
Viktor [21]

Answer:

Spring constant, k = 24.1 N/m

Explanation:

Given that,

Weight of the object, W = 2.45 N

Time period of oscillation of simple harmonic motion, T = 0.64 s

To find,

Spring constant of the spring.

Solution,

In case of simple harmonic motion, the time period of oscillation is given by :

T=2\pi\sqrt{\dfrac{m}{k}}

m is the mass of object

m=\dfrac{W}{g}

m=\dfrac{2.45}{9.8}

m = 0.25 kg

k=\dfrac{4\pi^2m}{T^2}

k=\dfrac{4\pi^2\times 0.25}{(0.64)^2}

k = 24.09 N/m

or

k = 24.11 N/m

So, the spring constant of the spring is 24.1 N/m.

6 0
3 years ago
You exert a force of 75 newtons on a rock. You push and you push, but you can’t budge it. You are exhausted! How much work did y
dalvyx [7]

Answer:   Work W = 0

Explanation: Work W = F·s. Because rock does not move, s = 0 and

work done is zero.

4 0
3 years ago
You ran a power plant what could you do to make this generator produce electricity
DIA [1.3K]
You could use a magnetic generator or you could use hydraulic power
8 0
3 years ago
A transverse wave is traveling through a canal. If the distance between two successive crests is 3.17 m and four crests of the w
Thepotemich [5.8K]

Answer:

a. 0.18Hz

b. 0.56m/s

Explanation:

From the question we can deduct the following parameters

The wavelength, λ is define as the distance between two successful crest or trough and from the question we conclude that wavelength is 3.17m.

Also the period of the wave T can be computed as

T=22.6/4

T=5.65secs.

a. To compute the frequency, recall that frequency, F=1/period.

Hence,

F=1/5.65

F=0.18Hz

b. Next we compute the wave speed.

Wave speed=frequency *wavelength

Wave speed =0.18*3.17

Wave speed =0.56m/s

5 0
3 years ago
If a car is traveling 27 meters in 3 seconds, what is its speed?
KIM [24]
9 because speed=distance/ time
5 0
2 years ago
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