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melomori [17]
3 years ago
12

Suppose you walk into a sauna that has an ambient temperature of 48.0°C. (a) Calculate the rate of heat transfer in watts to you

by radiation given your skin temperature is 37.0°C, the emissivity of skin is 0.98, and the surface area of your body is 1.30 m2.
Physics
1 answer:
GenaCL600 [577]3 years ago
4 0

Answer:99.84 W

Explanation:

Given

Ambient temperature T_{\infty }=48^{\circ}C\approx 321\ K

Temperature of skin T=37^{\circ}C\approx 310\ K

Skin emissivity \epsilon =0.98

Surface area A=1.30\ m^2

Rate of heat transfer is Q=\epsilon A\sigma (T_0^4-T^4)

Q=0.98\times 1.30\times 5.67\times 10^{-8}((321)^4-(310)^4)

Q=99.84\ W

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Four weather satellites are orbiting the Earth at a height of 825 kilometers. Some characteristics of the satellites are shown i
ratelena [41]

Answer:

D

Explanation:

The gravitational force between any two objects is affected by the masses of the objects and the distance between them. The greater the masses of the objects are, the stronger the gravitational force is.

Since all four of the satellites are the same distance from the Earth's surface, only their masses affect the strength of the gravitational force. At 903 kilograms, satellite D has the greatest mass, so the gravitational force pulling it toward the Earth is the greatest.

4 0
3 years ago
1. In which direction can a force be exerted on an object?
My name is Ann [436]
A. Any Direction
This should be obvious, as you can push down on something, push it to the sides, and push something up. Hope this helped!
3 0
4 years ago
What happens when a spinning ice skater draws in her outstretched arms? Group of answer choices Her moment of inertia increases
kotegsom [21]

Answer:

Her moment of inertia decreases causing her spin to speed up. The physics law behind this phenomenon is the conservation of angular momentum.

Explanation:

<em>Theory</em>

<u>The Law of conservation of angular momentum</u>

The angular momentum of a rotating body or a system remains constant unless it is acted upon by an external unbalance force.

Angular momentum = moment of inertia × angular velocity

The moment of inertia = mass×[perpendicular distance from axis of rotation]²

___________________________________________________________

⇒When skater draws in her outstretched arms the mass distribution get      concentrated towards the axis of rotation so the moment of inertia of the body decrease.

But angular moment should conserve so angular velocity  increases (spin increases)

5 0
3 years ago
In what sense did the flappers dressand dance represent a display of freedom​
pishuonlain [190]

Answer:

Flappers are symbols of the Thundering Twenties, the social, political disturbance and expanded transoceanic social trade that followed the finish of World War I. Flappers were viewed as reckless for wearing inordinate cosmetics, drinking liquor, smoking cigarettes in broad daylight, driving vehicles and treating sex nonchalantly. They guaranteed that the flappers' dresses were 'close to exposure', 'nervy', 'foolish', and unintelligent.

6 0
3 years ago
An object is pulled with a 85 N force inclined at 27° along a horizontal surface ABC
OLEGan [10]

Answer:

m = 15.15 kg

Explanation:

Newton's Second Law of motion states that when an unbalanced force is applied on a body, an acceleration is produced in it in the direction of force. The component of force along the horizontal direction here, will be given by the Newton's Second Law as:

Fx = ma

F Cosθ = ma

where,

F = Magnitude of Force = 85 N

θ = Angle with horizontal = 27°

m = mass of object = ?

a = acceleration of object = 5 m/s²

Therefore,

85 N Cos 27° = m(5 m/s²)

m = 75.73 N/5 m/s²

<u>m = 15.15 kg</u>

6 0
3 years ago
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