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3 years ago

How is it possible you can feel heat from the sun?

Physics

1 answer:

sergey [27]3 years ago

8 0

there are three ways by which we can transfer heat from one place to other

1. Conduction

In this method of heat transfer heat can be transferred from one place to other without actual movement of medium molecules. This is possible in solid conducting mediums

2. Convection

Here heat energy is carried away along with the medium molecules where medium molecules can move from one place to other while heat is transferred. It is possible in liquid and gas but not possible in solids

3. Radiation

In this mode of heat transfer we do not require any medium and here heat transferred by electromagnetic waves

So we can feel heat from sun in form of electromagnetic waves and it is the fastest way to transfer the heat also it do not require any medium

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Why are watersheds important to humans?

larisa86 [58]

Answer:

The surface water features and storm water runoff within watershed ultimately drain to other bodies of water.

Explanation:

8 0

3 years ago

Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light

12345 [234]

Well, we know that the total energy in a closed system remains constant.

The problem with the story of Eva is that she is not in a closed system.
If the dark room were really a closed system, then she could press the
button or turn the switch all day, and the lamp could not light. It needs
electrical energy coming in from somewhere in order to turn on.

Let's say that Eva used her arm muscles to strike a match and light the
candle on the table. Then we would have have food energy, muscle
energy, chemical energy in the match, chemical energy in the candle,
heat and light energy coming out of the candle, heat energy soaking into
her hand, light energy bouncing off of the book and into her eyes ... all
going on during the story, and the sum total of all of them would remain
constant.

4 0

4 years ago

Read 2 more answers

a pulley is used to lift a 2000 N safe over frosty's head. the safe is lifted 6m in 4s by Rudolph. how much power did Rudolph us

garri49 [273]

Answer:

3000W

Explanation:

Given parameter:

Weight of safe = 2000N

Height of lift = 6m

Time = 4s

Unknown:

Power used by Rudolph = ?

Solution:

Power is the rate at which work is being done. It is expressed as:

Power = $\frac{Work done }{Time taken}$

Work done = Weight x height = 2000 x 6 = 12000J

Power = $\frac{12000}{4}$ = 3000W

8 0

3 years ago

Convection is usually described as a ___________; when something is heated, it rises, cools, and then falls in a circular patter

creativ13 [48]

Answer:

Current

Explanation:

Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Simply put, Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down.

An everyday example of convection is boiling water ; The heat passes from the burner into the pot, heating the water at the bottom. The water at the bottom rises and is replaced by the water at the top of the pot.

This rise of less dense water at a higher temperature and fall of denser water at a lower temperature sets up a convention current circularly until the water boils. This is a typical example of the day to day application of convection currents.

6 0

3 years ago

A force of 100 N is applied to a crate at an angle of 60° to the horizontal surface.

ad-work [718]

Answer:

100 J

Explanation:

Given:

Force acting on the crate is, $F=100\ N$