Solve for r

F= k (m1m2/r^2)

Answers

Answer 1

Answer: $F= k ( m _(1)m _(2))/(r^2) \n \n r\neq 0\n \n r^2F =k\cdot m _(1)m _(2) / :F \n \nr^2= (k\cdot m _(1)m _(2) )/(F)\n \nr = \sqrt{(k\cdot m _(1)m _(2) )/(F)}$

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Sally is training for the 1,000-meter running race at her school. Her goal is to place third or better. How can Sally determine if she is making progress toward her goal?

Answers

She can monitor her practice run times to see if they are decreasing.

Answer: a

Explanation:

Sound waves in air are a series ofa. periodic disturbances.
b. periodic condensations and rarefactions.
c. high- and low-pressure regions.
d. all of the above E. none of the above

Answers

Sound waves in air are a series of periodic disturbances, periodic condensations and rarefactions, and high- and low-pressure regions. It is all of the above. The answer is letter D.

Final answer:

Sound waves in air are a series of periodic condensations and rarefactions.

Explanation:

Sound waves in air are a series of periodic condensations and rarefactions. When a sound is produced, it creates compression regions (areas of high pressure) and rarefaction regions (areas of low pressure) that propagate through the air. These alternating regions of high and low pressure create the characteristic waveform of the sound wave.

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Talking in to a microphone which energy dose your voice change as?

Answers

The microphone changes the mechanical energy of the sound wave into electric energy.

The equation E=mc^2 relates energy and.a. Force.
b. Mass.
c. Gravity.
d. Work.

Answers

B. Mass

It explains that,
"Matter and Energy are Interchangeable."
It's Einstein's equation meaning Energy is equal to the mass multiplied by the speed of light squared.

A hair dryer uses 72,000 joules of energy in 60 seconds. What is the power of this hair dryer?

Answers

The power of an object is the rate of work done or energy. Here, the energy used by the hair dryer is 72000 Joules. Hence, the power used by the dryer is 1200 watt.

What is power ?

The power of an object is a physical quantity that, measures the rate of the work done by the object or the energy used by the object. The energy used is equal to the work done by it. Hence both have the same standard unit of joule.

Power is the work done or energy divided by time. Hence, the unit of power is J/s which is equivalent to watt.

hence power = work done or energy / time

Given the energy used by the hair dryer = 72000 Joules

time = 60 seconds.

then, power = 72000 J/60 s = 1200 watt.

Therefore, the power used by the dryer is 1200 watt.

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Answer:

1200 Watts is the answer

Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?A. The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets

B. The planets formed at the center of a collapsing spinning cloud of gas and dust

C. The sun and planets formed from a collapsing spinning cloud of gas and dust.

D. A comet hit the sun and sent off fragments the became the planets.

I'm pretty sure it's C?

Answers

Answer: C. The sun and planets formed from a collapsing spinning cloud of gas and dust.

Explanation:

The entire solar system was formed from solar nebula. A nebula is a cloud of dust and gases. When this cloud spins and contracts, a protostar is formed. The temperature rises and nuclear fusion kicks in forming a star. The rest of the matter forms planets and other celestial bodies of the star system. Similarly, the Sun was formed in solar nebula from collapsing of spinning cloud of dust and gas.

You're right, Answer C

The dust and gas accumulate to form a solar nebula, which later on creates the star and the planets.

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