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3 years ago

Kepler proposed the modern model of the solar system. True or False

Physics

1 answer:

givi [52]3 years ago

4 0

Answer:

True

Explanation:

Johannes Kepler was a German astronomer, mathematician and astrologer. He proposed a model of the solar system which remains in use, with some modifications. Moreover, he developed the laws of planetary motion which explain how the planets move around the sun. This work was not only significant on its own, but it also provided the foundations for Newton's theory of universal gravitation.

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1. Since sleep is so important, we might wonder why people so often fail to get a sufficient amount

ziro4ka [17]

Answer: 9/10

Explanation:

because it's really important and makes you energetic

8 0

2 years ago

A hydrogen atom has 1 electron. In which level is it?

kolezko [41]

If it is in its ground state, it will be in the level 1s

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3 years ago

A classroom that normally contains 40 people is to be airconditioned with window air-conditioning units of 5-kW cooling capacity

oksano4ka [1.4K]

Answer:

About 2 units.

Explanation:

We assume that there is no heat dissipating instrument in the room

Total cooling load of the room is defined from the given below equation

$Q_{cooling}$ = $Q_{light}$ + $Q_{people}$ + $Q_{heat gain}$

where

$Q_{light}$ = 10*100 W =1 KW

$Q_{people}$ = 40*360 KJ/h= 4 KW

$Q_{heat gain}$ =15000KJ/h= 4.17 KW

$Q_{cooling}$ = 1+4+4.17=9.17 KW

the number of air conditioner unit is = $\frac{9.17}{5}$ =1.83

which is approximately 2 units

7 0

3 years ago

A small 20-kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?

MariettaO [177]

Ek=1/2mv^2 = (20)(1/2)(2x2) =40

8 0

3 years ago

Read 2 more answers

What is the external-internal pressure difference when the diver's lungs are at a depth of 6.1m (about 20ft)? assume that the di

Nesterboy [21]

Snorkel connects the diver's lungs with the air above the water. Because of this, the pressure inside the diver's lungs is the same as the atmospheric pressure.
The static pressure of a fluid is given with this equation:
$P=\rho gh$
The density of water is 1000kg/m^3.
$P=1000\cdot 9.81 \cdot 6.1=59841$Pa$
Standart atmospheric pressure is 101<span>325Pa.
</span>The difference is:
$\Delta P=101325-59841=41484 $Pa$

8 0

3 years ago