PHYSICS MIDDLE SCHOOL

Which of the following is not an example of potential energy? chemical energy, gravitational energy, thermal energy, nuclear energy

Answers

Answer 1
Answer:

Answer:

nuclear energy

Explanation:

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gas has a volume of 185 ml and pressure of 310 mm hg. The desiered volume is 74.0 ml. What is the required new pressure

Answers

Answer:

The required new pressure is 775 mm hg.

Explanation:

We are given that gas has a volume of 185 ml and a pressure of 310 mm hg. The desired volume is 74.0 ml.

We have to find the required new pressure.

Let the required new pressure be '\text{P}_2'.

As we know that Boyle's law formula states that;

                    P_1 * V_1 = P_2 * V_2

where, P_1 = original pressure of gas in the container = 310 mm hg

           P_2 = required new pressure

            V_1 = volume of gas in the container = 185 ml

            V_2 = desired new volume of the gas = 74 ml

So,  P_2 = (P_1 * V_1)/(V_2)  

       P_2 = (310 * 185)/(74)

            =  775 mm hg

Hence, the required new pressure is 775 mm hg.

Plz help.How do ions form electrically neutral compounds?

Answers

They form electrically neutral compounds because the number of captions (positively charged ions) is equal to the number of anions (negativley charged ions) These ions are held together by strong electrostatic forces of attraction.

What do tendons connect skeletal muscles to?​

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Answer:

Tendons connect muscle to bone. These tough, yet flexible, bands of fibrous tissue attach the skeletal muscles to the bones they move. Essentially, tendons enable you to move; think of them as intermediaries between muscles and bones.

Hope this helps! (:

Answer:

Explanation:Tendons connect muscle to bone. These tough, yet flexible, bands of fibrous tissue attach the skeletal muscles to the bones they move. Essentially, tendons enable you to move; think of them as intermediaries between muscles and bones.

What is thermal pollution?

Answers

Basically heat pollution. "Thermal" means heat, so yea

Answer:

specifically, heat lost to air and water causing enviormental changes

Explanation:

Which hormones help build bones?

Answers

Hormones are really important to bone strength. Hormones are chemicals made by glands that travel throughout the body and have many effects on growth, maturation, energy, weight, and bone strength. Sex hormones (estrogen made in the ovary of females and testosterone made by the testes in males) control ability to reproduce. They also are a major reason that bone strength increases in the early teenage years. When teenagers have low estrogen or testosterone levels, the bone becomes weaker.
Hormones are really important to bone strength. Hormones are chemicals made by glands that travel throughout the body and have many effects on growth, maturation, energy, weight, and bone strength. Sex hormones (estrogen made in the ovary of females and testosterone made by the testes in males) control ability to reproduce. They also are a major reason that bone strength increases in the early teenage years. When teenagers have low estrogen or testosterone levels, the bone becomes weaker.

Other hormones come from the thyroid gland, the parathyroid gland, the pituitary gland near the brain, and the brain itself. These hormones control levels of calcium in the blood, energy levels, and ability to grow. They act the same in boys and in girls. Healthy bones need the correct levels of all of these hormones. There are many reasons these hormones can be too high or low, but fortunately they are all uncommon.

Most of these hormones do not become abnormal because of things we can do. Estrogen and testosterone, however, depend on normal body weight. If teenagers do not get enough nutrition and become too thin, then the hormone levels will be too low. The parathryoid hormone also responds to nutrition. Too little calcium causes parathyroid hormone to increase and that will dissolve some of the bone.

Please explain as if I am a 6 year old; why is time travel theoretically impossible?

Answers

Why exactly do you mean
Time travel would create paradoxes and history could be altered, resulting in something called the "butterfly effect". This means that even the smallest of changes can result in a HUGE difference. If you traveled back in time, you would interact with people and things. This would alter history, creating massive ripples in time. The movie "Back to the Future" and the new Harry Potter book have great examples of this. Hope I answered your question!
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