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scZoUnD [109]
3 years ago
6

The sun continuously radiates energy into space in all directions. Some of the sun's energy is intercepted by the Earth. The ave

rage temperature of the surface of the Earth remains a little above 300 k. Why doesn't the Earth's temperature rise as it intercepts the sun's energy?
A. The Earth reflects the sun's light.

B. The Earth radiates an amount of energy into space equal to the amount it receives.

C. The energy only raises the temperature of the upper atmosphere and never reaches the surface.

D. The thermal conductivity of the Earth is low.

E. The heat is carried away from the Earth by convection currents.
Physics
1 answer:
8_murik_8 [283]3 years ago
7 0

B. The Earth radiates an amount of energy into space equal to the amount it receives.

Part of the solar energy is reflected by the Earth into space, this is known as albedo. The other part of the energy radiated by the Earth in the form of infrared radiation, is absorbed by the greenhouse gases, which cause most of this infrared radiation to be emitted into space. Therefore, the net flow of energy is zero.

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If the rectangular barge is 3.0 m by 20.0 m and sits 0.70 m deep in the harbor, how deep will it sit in the river?
leva [86]

The harbour contains salt water while the river contains fresh water. So assuming that the densities of fresh water and salt water are:

density (salt water) = 1029 kg / m^3

density (fresh water) = 1000 kg / m^3

The amount of water (in mass) displaced by the barge should be equal in two waters.

mass displaced (salt water) = mass displaced (fresh water)

Since mass is also the product of density and volume, therefore:

<span>[density * volume]_salt water = [density * volume]_fresh water                 ---> 1</span>

 

First we calculate the amount of volume displaced in the harbour (salt water):

V = 3.0 m * 20.0 m * 0.70 m

V = 42 m^3 of salt water

Plugging in the values into equation 1:

1029 kg / m^3 * 42 m^3 = 1000 kg/m^3 * Volume fresh water

Volume fresh water displaced = 43.218 m^3

 

Therefore the depth of the barge in the river is:

43.218 m^3 = 3.0 m * 20.0 m * h

<span>h = 0.72 m        (ANSWER)</span>

8 0
3 years ago
A point charge is placed 3m from a 4uc charge what is the strength of the electric field on the point charge at this distance ro
Vlada [557]

The strength of the electric field on the point charge at this distance will be 4000 V/m.

<h3>What is the strength of the electric field?</h3>

The strength of the electric field is the ratio of electric force per unit charge.

The given data in the problem is;

Qis the unit charge = 4.0 × 10⁻⁶ C

E is the strength of the electric field

R is the distance from point charge = 3 m

The strength of the electric field is;

\rm E = \frac{KQ}{R^2} \\\\ \rm E = \frac{9 \times 10^9 \times 4 \times 10^{-6} \ C}{3^2} \\\\ E= 4000 V/m

Hence, the strength of the electric field on the point charge at this distance will be 4000 V/m.

To learn more about the strength of the electric field refer to the link;

brainly.com/question/15170044

#SPJ1

7 0
1 year ago
A photon has an energy of 5.53 à 10¯17 j. what is its frequency in s¯1?
Butoxors [25]
<span>energy is directly proportional fo frequency 
as in blue photons are more energetic than red photons 
so 
E = h * f 
look up h (Planck's constant) 
plug and play!</span><span>
</span>
5 0
3 years ago
The negatively charged student touches a metal tap and receives am electric shock.<br> Explain why.
svetlana [45]

Answer:

The potential difference between the student and the tap causes electrons to transfer to the tap which is earthed.

Hope this helps my sis and others

-Amelia

8 0
3 years ago
Read 2 more answers
What is an object's change in position, or displacement, and the change in time over which that displacement occurred used to ca
nikklg [1K]
The average velocity as velocity is equal to displacement/time
7 0
3 years ago
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