3 years ago

Why are satellites placed into orbit at least 150 km above Earth’s surface?

2 answers:

8 0

Because its just enough to where its not out f the gravitational pull and not close enough to be pulled back to earth. Hope it helps<span />

Anna007 [38]3 years ago

7 0

It's TO AVOID AIR RESISTANCE on E2020. Hope I helped :)

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In what unit do we measure force? in physics

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Answer:

Newton

Explanation:

The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg.

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3 years ago

A sample of oxygen gas at 25.0Â°c has its pressure tripled while its volume is halved. What is the final temperature of the gas?

Marat540 [252]

Answer:

447 K

Explanation:

25 C = 25 + 273 = 298 K

Assuming ideal gas, we can apply the ideal gas law

$\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$

$T_2 = T_1\frac{P_2}{P_1}\frac{V_2}{V_1}$

Since pressure is tripled, then $P_2 / P_1 = 3$ . Volume is halved, then $V_2 / V_1 = 0.5$

$T_2 = 298*3*0.5 = 447 K$

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3 years ago

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What is the frequency of a wave that has a speed of 5 m/s and a wavelength of 0.5meter?

Debora [2.8K]

Explanation:

frequency =speed/wavelength

=5/0.5=10Hz

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3 years ago

A weight lifter does 586 J of work on a weight that he lifts in 3.5 seconds. What is the power with which he lifts the weight?

Neko [114]

Answer:

Explanation:

The quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force work.

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2 years ago

Compare and contrast microscopic and macroscopic energy transfer Give least three comparisons for each

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Answer:

Differences

microscopic refers to substances visible to the naked eye

macroscopic are substances invisible to naked eye

Similarities

both refer to different scales that are useful to determining the size to different compounds.

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