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elena-14-01-66 [18.8K]
2 years ago
12

The girl in the picture is at the highest point in swinging and starts to come down. Which statement best describes the changes

in energy as she begins to descend?.
SAT
1 answer:
SpyIntel [72]2 years ago
4 0

When she descends the potential energy will decrease at the same rate that the kinetic energy increases.

<h3></h3><h3>How to describe changes in energy?</h3>

We know that we can write the total energy of a moving object as:

E = U + K

Where U is the potential energy and K is the kinetic energy.

In the given case, U will only depend on the height of the girl and it will be maximized when the height is maximum.

K = (1/2)*m*v^2

where m is the mass and v is the velocity.

When the girl is at the highest point, the velocity becomes equal to zero. This happens because at that point she stops going up and starts going down, so the velocity must be zero at that moment.

Then we have K = 0.

E = U.

As she starts going down, the velocity starts increasing and the height decreases, thus, the kinetic energy increases and the potential energy decreases. This relates to the conservation of energy. E will always be the same value, but K and U will depend on the position of the girl.

This means that if the potential energy decreases a quantity e', then the kinetic energy must be increased by that same amount.

If you want to learn more about energy, you can read:

brainly.com/question/166559

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What is the advantage of timing over a shorter period of time especially after exercising
Arada [10]

Answer:

Exercise is what we do when we are to increase are strength, stamina, and even our breathing. It is considered important, since it helps our body to become physically healthy. Our muscles need Exercise to not loosen its figure or shape. You can actually tell when someone does exercises and to those who not. It also decreases high content of fat inside our body. Fat is normal to be present in the body, but too much of it endangers our health and life if in a serious matter. It is better to have a proper timing to have a cool down to avoid feeling dizzy and lightheaded after an exercise. Stretching is important to give the muscle time to recover and to reduce muscle soreness, relax tensions, accelerate your recovery process to perform better on the next workout or exercise. There are many types of exercise that helps our body produce sweat and burns unnecessary fats. These are:

1. Aerobic

2. Flexibility

3. Strength

4. Balance

Explanation:

1. Aerobic-this exercise includes activities like running and swimming, to help your cardiovascular system to have much more endurance.

2. Flexibility-mostly used in warm-ups, flexibility is about stretching your muscles to the point it will get used to it after some time.

3. Strength-includes weight lifting, it makes the muscles more compact and reduces fat the faster way.

4. Balance- whenever we are standing

in one leg to balancing yourself while standing. Balance exercise is important in stabilizing yourself.

These exercises can go to beginner level to pure athlete type. Which means it isn't a joke to perform one of these. It requires focus and effort for a long period of time. It can be extreme if necessary. But take into mind that doing so much or doing it without rest is pure evil.

Drink to re-hydrate yourself. A warm water will help the arteries to loosen and help in proper blood circulation. Replenishing your body's water supply can increase your flexibility and strength. It is also nice to take a cool shower and change your clothing as well. And munch on a little snack will help you gain the energy you used during Exercise. Be careful to eat the right snack to avoid gaining weight.

The advantage of timing is you allow your

muscles and your body to keep up with your

work-out, your giving it time to fully take in

what you are working on. There is such thing

as overworking your body, which may cause

serious trouble.

5 0
2 years ago
Why does having a high first ionization energy and high electronegativity cause a nonmetal to be very reactive?.
Elena-2011 [213]

There in an increase in reactivity because the nonmetals want to hold on to their electrons.

<h3>Reactivity</h3>

With less electronegativity, there is also less ionization energy. For metals, it is easier to lose the electrons, hence the metal becomes more reactive because it uses less energy.

For nonmetals, they are gain electrons and not lose them. Thus, an increase in electronegativity and ionization energy means an increase in reactivity because the nonmetals want to hold on to their electrons.

Find out more on reactivity at: brainly.com/question/17141109

6 0
2 years ago
Twice the sum of 10 and a number is 28. Find the number.
miskamm [114]
Short answer: 4

Explanation:
So to do this you have to look at the problem backwards, so 28 divided by 2, 14 - x = 10 If 10 + x = 14 the x = 4
7 0
2 years ago
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Which value of x makes the equation 0. 75(x + 20) = 2 + 0. 5(x - 2) true?
bija089 [108]

Answer:

-56

Explanation:

From the equation:

0.75(x + 20) = 2 + 0.5(x - 2)

Open brackets

0.75x + 15 = 2 + 0.5x - 1

Collect like terms

0.75x - 0.5x = 2 - 1 - 15

0.25x = - 14

Divide both sides by 0.25

x = -56

7 0
2 years ago
A microbiologist tested 4 substances to find out if they would kill certain types of bacteria. The substances were applied to a
tatuchka [14]

Answer:

D.was Abel to kill all 3 types of bacteria

5 0
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