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3 years ago

9

Select the correct arrow. Which arrow correctly shows the flow of heat? Reset Next

2 answers:

Arturiano [62]3 years ago

8 0

Answer:

the first one

Explanation:

julsineya [31]3 years ago

6 0

Answer:

where is the image?

Explanation:

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How is the electromagnetic force different than both the gravitational force and the strong nuclear force? It has an infinite ra

Irina-Kira [14]

Answer: It is repulsive.

Explanation:

Electromagnetic force is attractive in nature when acts between two unlike charges and repulsive in nature when acts between like charges. It has infinite range. It does not hold protons together because it is repulsive in nature between two protons.

Gravitational force is always attractive in nature. It acts between any two bodies having mass. It has infinite range.

Strong nuclear force acts at subatomic level ( nucleus of an atom ). It is attractive in nature. It holds protons together inside the nucleus. It does not have infinite range.

Hence, electromagnetic force is different from both the gravitational force and the strong nuclear force as the later two are attractive but electromagnetic force is repulsive as well.

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3 years ago

Read 2 more answers

Homeostasis can require the control of many different variables in organisms. Homeostasis regarding internal body temperature is

12345 [234]

Answer:

idk because idk

Explanation:

idk

4 0

3 years ago

The principles used to solve this problem are similar to those in Multiple-Concept Example 17. A 205-kg log is pulled up a ramp

malfutka [58]

Answer:2538.43 N

Explanation:

Given

Mass of Log=205 kg

Ramp angle $=25^{\circ}$

Coefficient of Friction=0.855

log acceleration $=0.647 m/s^2$

Let T be the Tension

$T-mgsin\theta -f_r=ma$

Here $f_r=frictional\ Force=\mu N=0.855mgcos\theta =1556.76 N$

$T=mgsin25+m\times 0.647+1556.76$

T=849.04+132.63+1556.76=2538.435 N

8 0

3 years ago

Which of the objects have only potential energy?

vitfil [10]

Answer:

A raised weight.

Water that is behind a dam.

A car that is parked at the top of a hill.

A yoyo before it is released.

River water at the top of a waterfall.

A book on a table before it falls.

A child at the top of a slide.

Ripe fruit before it falls.

Explanation:

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2 years ago

A lead ball is dropped 30 feet from a church tower. If the acceleration due to gravity is 9.8m s^-2, how long does it take the b

Alika [10]

<em>fina</em><em>l</em><em> </em><em>velo</em><em>city</em><em> </em><em>of</em><em> </em><em>a</em><em> </em><em>falli</em><em>ng</em><em> </em><em>obj</em><em>ect</em><em> </em><em>=</em><em> </em><em>0</em>

<em>and</em><em> </em><em>accel</em><em>eration</em><em> </em><em>of</em><em> </em><em>a</em><em> </em><em>falli</em><em>ng</em><em> object</em><em> </em><em>is</em><em> </em><em>nega</em><em>tive</em>

<em>now</em><em> </em><em>usi</em><em>ng</em><em> </em><em>the</em><em> </em><em>exp</em><em>ression</em><em> </em><em>(</em><em> </em><em>Newton's</em><em> </em><em>3</em><em>r</em><em>d</em><em> </em><em>eq</em><em>uation</em><em> </em><em>of</em><em> </em><em>mo</em><em>tion</em><em>)</em>

<em> ${v}^{2} = {u}^{2} - 2gs$ </em>

<em>wher</em><em>e</em><em> </em><em>the</em><em> </em><em>para</em><em>meters</em><em> </em><em>ha</em><em>ve</em><em> </em><em>the</em><em>ir</em><em> </em><em>usu</em><em>al</em><em> </em><em>meaning</em>

<em>maki</em><em>ng</em><em> </em>

<em> ${u}^{2} \: the \: subject$ </em>

<em>thus</em><em> </em>

<em> ${u}^{2} = 2gs$ </em>

<em> $u = \sqrt{2gs}$ </em>

<em>from</em><em> </em><em>the</em><em> </em><em>question</em><em>,</em><em> </em>

<em>g</em><em>=</em><em> </em><em>9</em><em>.</em><em>8</em><em>m</em><em>/</em><em>s^</em><em>2</em>

<em>s</em><em> </em><em>=</em><em> </em><em>3</em><em>0</em><em>m</em>

<em>sub</em><em>stitute</em><em> </em><em>the</em><em>m</em><em> </em><em>in</em><em>to</em><em> </em><em>th</em><em>e</em><em> equation</em>

<em> $u = \sqrt{2(9.8 \times 30)}$ </em>

<em> $u = \sqrt{588}$ </em>

<em>u</em><em> </em><em>=</em><em> </em><em>2</em><em>4</em><em>.</em><em>2</em><em>5</em><em>m</em><em>/</em><em>s</em>

<em>but</em><em> </em><em>the</em><em> </em><em>qu</em><em>estion</em><em> </em><em>is</em><em> </em><em>dem</em><em>anding</em><em> </em><em>for</em><em> </em><em>tim</em><em>e</em><em> </em><em>but</em><em> </em><em>no</em><em>t</em><em> </em><em>the</em><em> </em><em>ini</em><em>tial</em><em> </em><em>veloc</em><em>ity</em>

<em>so</em><em> </em><em>sub</em><em>stitute</em><em> </em><em>them</em><em> </em><em>in</em><em> </em><em>the</em>

<em>Newton's</em><em> first</em><em> </em><em>eq</em><em>uation</em><em> </em><em>of</em><em> </em><em>motion</em>

where

V = u - gt

but from the question,

v= 0 and the acceleration is negative because it's a free fall

substitute the values into the equation

0 = 24.24 -9.8t

making t the subject

9.8t = 22.24

dividing through by 9.8

9.8t/9.8 = 22.24/9.8

t = 2.3s . therefore, it would take 2.3s for the ball to hit the ground.

4 0

4 years ago