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guapka [62]
3 years ago
11

How can we tell when forces are acting on an object (science)

Physics
1 answer:
iren [92.7K]3 years ago
4 0

If an object's speed changes, or if it changes the direction it's moving in,
then there must be forces acting on it. There is no other way for any of
these things to happen.

Once in a while, there may be <em><u>a group</u></em> of forces (two or more) acting on
an object, and the group of forces may turn out to be "balanced".  When
that happens, the object's speed will remain constant, and ... if the speed
is not zero ... it will continue moving in a straight line.  In that case, it's not
possible to tell by looking at it whether there are any forces acting on it. 


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A horizontal clothesline is tied between 2 poles, 12 meters apart. When a mass of 1 kilograms is tied to the middle of the cloth
nadya68 [22]

Answer:

The  tension on the clotheslines is  T  = 8.83 \ N

Explanation:

The  diagram illustrating this  question is  shown on the first uploaded image

From the question we are told that  

    The distance between the two poles is  d =  12 \ m

     The mass tie to the middle of the clotheslines m  =  1 \ kg

     The length at which the clotheslines sags is  l  = 4 \ m

Generally the weight due to gravity at the middle of the  clotheslines is mathematically represented as

          W =  mg

let the angle which the tension on the  clotheslines makes with the horizontal be  \theta which mathematically evaluated using the SOHCAHTOA as follows

        Tan  \theta =  \frac{ 4}{6}

=>     \theta =  tan^{-1}[\frac{4}{6} ]

=>     \theta  =  33.70^o

   So the vertical component of this  tension is  mathematically represented a  

      T_y  = 2*  Tsin \theta

Now at equilibrium the  net horizontal force is  zero which implies that

          T_y  -  mg  = 0

=>       T sin \theta  -  mg  =  0

substituting values

          T  =   \frac{m*g}{sin (\theta )}

substituting values

           T  =   \frac{1 *9.8}{2 * sin (33.70 )}

           T  = 8.83 \ N

6 0
3 years ago
A woman drives 200 miles west and then turns south and drives 375 miles. Her trip takes her 11.75 hrs. What is the woman's avera
FromTheMoon [43]

Answer:

The woman's average velocity during the trip is 36.2 miles/hour.

Explanation:

Velocity can be define as the displacement of an object per time. It is a vector quantity, and measured in m/s.

i.e velocity = \frac{displacement}{time}

From the given question,

Displacement = \sqrt{200^{2} + 375^{2}  }

                       = \sqrt{40000+140625}

                       = \sqrt{180625}

                       = 425

The displacement of woman is 425 miles.

velocity = \frac{425}{11.75}

             = 36.1702 miles/hour

The woman's average velocity during the trip is 36.2 miles/hour.

7 0
3 years ago
IDENTIFY and DESCRIBE the six climate regions.
Bad White [126]

Answer:

6 climate regions are Mediterranean, Polar, Tropical, Temperate, Arid and Tundra.

Explanation:

There are six main climate regions in the world. These regions distinguished from one another on the basis of climate that exists there. Above mentioned climates are described shortly as follows:

Mediterranean: This region is the region surrounding the Mediterranean sea, Southern California and Southern America. The climate in this region is hot and dry in summer whereas mild winters are there in this region.

Polar: This region is on the South Pole, near the side of Greenland. The climate in this region is very cold and chilled.

Tropical: This region consists of jungles of South America, Africa, some parts of Asia and the islands of Pacific. The climate of this region is Hot. Due to heavy rainfalls in this area, the area is also wet.

Temperate: North America, Europe and Northern Asia is included in this region. The climate is mild hot in summers and cold in winters.

Arid: This region consists of deserts of Africa, Asia, US and Australia. The climate is very hot throughout the year.

Tundra: This region consists of the mountain tops of America, Asia and Greenland. The climate is extremely cold in such regions throughout the year.

3 0
3 years ago
Complete the sentences below using the words below, you may use each word more than once
satela [25.4K]
Decreases, stays the same, increases. The volume decreases because as air is cooled, the individual molecules collectively possess less kinetic energy and the distances between them decrease, thus leading to a decrease in the volume they occupy at a certain pressure (please note that my answer only holds under constant pressure; air, as a gas, doesn't actually have a definite volume). The mass stays the same because physical processes do not create or destroy matter. The law of conservation of mass is obeyed. You're only cooling the air, not adding more air molecules. The density decreases because as the volume decreases and mass stays the same, you have the same mass occupying a smaller volume. Density is mass divided by volume, so as mass is held constant and volume decreases, density increases.
7 0
3 years ago
Hii please help i’ll give brainliest if you give a correct answer please please hurry it’s timed
Yanka [14]

Answer:

Sorry I'm wrong The person above is correct.

I tried.

4 0
3 years ago
Read 2 more answers
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