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3 years ago

12

two object gravitationally attract with a force of 20N.if the distance between the two object centers is doubled, then what is t

he new force?

1 answer:

Usimov [2.4K]3 years ago

8 0

Gravity decreases with the square of the distance, so the new force is (20)/(2*2) = 5N.

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Un alumno menciona que al abrir la ventana de su casa sintió cómo el frío ingresaba a su cuerpo. Menciona cuál es la verdadera r

stepan [7]

Answer:

My believe the answer is

A.) or B.)

Explanation:

Here is why I think A is the answer.

If we use the process of elimination, it would look like this,

a) Porque el aire tiene una temperatura menor que la de su cuerpo; por eso se propaga más rápido.

<em>This makes sense because we all know in winter the weather is very cold and freezing.</em>

b) Porque la temperatura de su cuerpo, siente el aire frio que entra por la ventana.

<em>I feel like this answer is the question, but it could also be an answer, sorry, I'm a little uncertain.</em>

c) Porque el calor de su cuerpo se propaga al medio ambiente, al ser la temperatura del niño mayor que la del aire exterior.

<em>This answer has nothing to do with the question, plus it is very false, our body heat is not enough to overcome the very cold temperature from outside.</em>

d) Porque la temperatura del aire es igual a la temperatura del cuerpo.

<em>This is false because again our body heat is not even compared to the freezing cold temperatures from the winter.</em>

<em />

<em />

<h2>Well, have a nice rest of the day!</h2><h3>ba baiii!</h3>

3 0

2 years ago

A bowl contains 4 red balls and 2 green balls. Two balls are selected simultanesouly and at random. What is the conditional prob

AlladinOne [14]

Answer:0.6

Explanation:

Given

Bowl contains 4 red and 2 Green balls

Probability of selecting two red balls given atleast one of the ball is red + Probability of selecting two red balls given that no ball is red =1

Probability of selecting two red balls given that no ball is red $=\frac{Probability \ of\ selecting\ two\ red\ balls\ out\ of\ 4\ balls}{probability\ of\ selecting\ 2\ balls\ out\ of\ 6 balls}$

$P=\frac{^{4}C_2}{^{6}C_2}$

$P=\frac{2}{5}$

Required Probability $=1-\frac{2}{5}=\frac{3}{5}$

7 0

3 years ago

A 100kg crate slides along a floor with a starting velocity of 21ms If the force due to friction is 8N how long will it take for

GaryK [48]

A 100kg crate slides along a floor with a starting velocity of 21 m/s. If the force due to friction is 8N, then, it will take 262.5 s for the box to come to rest.

We'll begin by calculating the declaration of the box. This can be obtained as follow:

Force (F) = –8 N (opposition)

Mass (m) = 100 Kg

<h3>Deceleration (a) =? </h3>

<h3>F = ma</h3>

–8 = 100 × a

Divide both side by 1000

$a = \frac{-8}{100}$

<h3>a = –0.08 ms¯²</h3>

Therefore, the deceleration of the box is –0.08 ms¯²

Finally, we shall determine the time taken for the box to come to rest. This can be obtained as follow:

Deceleration (a) = –0.08 ms¯²

Initial velocity (u) = 21 ms¯¹

Final velocity (v) = 0 ms¯¹

<h3>Time (t) =.? </h3>

<h3>v = u + at</h3>

0 = 21 + (–0.08×t)

0 = 21 – 0.08t

Collect like terms

0 – 21 = –0.08t

–21 = –0.08t

Divide both side by –0.08

$t = \frac{-21}{-0.08}\\\\$

<h3>t = 262.5 s</h3>

Therefore, it will take 262.5 s for the box to come to rest.

Learn more: brainly.com/question/14446351

7 0

2 years ago

NEED HELP !!!!!

goblinko [34]

Answers with Explanations:

1. Answer: True

Explanation:

Muscle cramps happen especially during an <em>"intense workout."</em> The frequency of cramps is related to heat, thus it is important to<u> stay hydrated</u> all throughout the workout. Eating should be done<em> at least 2 to 3 hours</em> <em>prior to workout</em> because eating immediately before exercise leads to undigested food. Such kind of food causes cramps.

2. Answer: True

Explanation: Applying direct pressure immediately after the injury can help <em>decrease bleeding.</em> Blood loss results to <u>blood that is collected under the skin. </u>This turns into the color of blue or black, also known as "bruise." Decrease bleeding would then mean decrease bruising.

Applying pressure also <em>decreases swelling </em>because it restricts the blood flow and fluid from reaching into the injury.

3. Answer: False

Explanation: "Lordosis" refers to the body's<em> natural lordotic curve</em>. This is considered "normal." The excessive inward curve of the lumbar spine is called "hyperlordosis." This is commonly caused by<u> poor posture, lack of exercise, obesity and spinal conditions.</u>

4. Answer: False

Explanation: The mnemonic acronym "RICE" stands for<em> Rest, Ice, Compression</em><em> (not Cold)</em> and<em> Elevation</em>. This term is commonly used in First Aid and was introduced by Gabe Mirkin in 1978.

5. Answer: True

Explanation: Keeping the proper posture during exercise <u><em>prevents the body from encountering injuries</em></u>. It also ensures that the body is executing the exercise by<u> using the muscles properly.</u>

6. Answer: False

Explanation: "Ice" is important in<em> decreasing the swelling of the injury</em>. It constricts the blood vessels which prevents the flow of blood and other fluids towards the site of injury.

7. Answer: False

Explanation: The spine is naturally straight if a person doesn't have a medical problem. However, scoliosis is a medical problem. It is <u>a condition wherein a person's spine is </u><u>curved</u>, rather than being straight.

8. Answer: True

Explanation: When it comes to exercise,<em> starting slow</em> is the main key. It is followed by<u> gradual building up.</u> The increase will depend on the person's stamina. For example, <em>starting with a warm-up, followed by a slow walk then pacing up to a brisk walk.</em>

9. Answer: True

Explanation: Kyphosis is a spinal condition wherein the person's spine is <em>excessively curved outward.</em> This causes the upper back and the shoulders to be rounded. This condition is commonly called "hunchback."

10. Answer: True

Explanation: Proper posture entails the right amount of spinal curve. This means that the spine is in "neutral position." This means that the spine takes on the "S-shape." A little amount of curve results to a<em> "flat back</em>" while too much curve results to a <em>"swayback</em>."

11. Answer: all of the above

Explanation: Body posture and technique are important especially when it comes to exercise. Poor posture and technique lead to strain on joints, ligaments and injury especially to the muscles. This also puts the body out of alignment.

12. Answer: True

Explanation: Stretching is appropriately done at the<u> end of a warm-up</u> when the temperature has increased because at this time, the muscles are already flexible. It allows the muscles to be loosened and also aids in better performance during workouts or exercises.

13. Answer: False

Explanation: "Lifting" with your back only will result to muscle injury. There are several ways to do lifting such as "pull-ups" or "lat pull downs." This means that you are not lifting with your back only but using your other joints and muscles for lifting.

14. Answer: True

Explanation: "Warming-up" is an essential preparation before any workout because it prepares the body by<em> increasing temperature</em> and <em>blood flow to the muscles</em>. Without it, the muscles will become sore and the chance for injuries increases.

15. Answer: True

Explanation: "Cool down" is considered equally important as "warm-up." <u>It lowers the body's temperature </u>and lowers the amount of lactic acid that causes<u> muscle cramping, soreness and stiffness.</u>

16. Answer: True

Explanation: It is said that<em> most people forget about warming up and cooling down before and after they work out</em>. It is necessary to have 5 to 10 minutes of warm-up and cool down for every exercise routine.

17. Answer: False

Explanation: Knee extension is <em>best done at 90 degrees angle</em> as advised by most health experts. However, it depends on your capability and your exercise goals. For some people, <u>extending beyond 90 degrees is beneficial.</u>

18. Answer: True

Explanation: Tucking your belly button helps with your body's core exercise. If this is going to be done throughout the day, then surely it will strengthen the muscles. This can be done while a person is sitting down or walking.

4 0

3 years ago

When ocean temperature rises,

lilavasa [31]

Answer:

see below

Explanation:

Kind of like when yo open a warm soda .....excess gas is released

3 0

1 year ago