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3 years ago

100 Points

Physics

1 answer:

solniwko [45]3 years ago

8 0

Answer:

4) Isaac Newton was the first scientist to propose the idea that gravity increases distance between objects decrease

Explanation:

1 - Kepler may have inspired most of Newton's propositions, but there is no record of collaborating on the theory of universal gravitation.

2 - The universal gravitation theory resemble the works of other great scientists, but Newton was indeed the first to propose this idea of gravitation

3 - On the contrary, these scientists have shared concepts, with differences in accuracy that supersede each other to be accepted by the community (i.e: Einstein being at the forefront despite sharing some ideas with Newton)

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Whats the force of gravitation of a 10kg rock and 100kg boulder which are 5 meters apart

spayn [35]

Answer:

F = 2.6692 x 10⁻⁹ N

Explanation:

Given,

The mass of the rock, m = 10 kg

The mass of the boulder, M = 100 kg

The distance between them, d = 5 m

The gravitational force between the two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them. It is given by the formula

<em> F = GMm/d² newton</em>

Where,

G - Universal gravitational constant

Substituting the given values,

F = 6.673 x 10⁻¹¹ x 100 x 10 / 5²

F = 2.6692 X 10⁻⁹ N

Hence, the force between the two bodies is, F = 2.6692 X 10⁻⁹ N

6 0

3 years ago

6)the speed of light is approximately 186,000 mi/sec. It takes light from a particular star approximately 9 yrs to reach Earth.

NeTakaya

Answer:

5.2791264*10¹³

Explanation:

Convert the 9 years to seconds and then multiple it by 186000

5 0

3 years ago

To navigate, a porpoise emits a sound wave that has a wavelength of 3.3 cm. The speed at which the wave travels in seawater is 1

dedylja [7]

Answer:

$2.2\times 10^{-5} s$

Explanation:

We are given that

The wavelength of sound wave= $\lambda=3.3 cm=3.3\times 10^{-2}m/s$

1 cm/s= $10^{-2}m/s$

Speed of sound wave,v= $1522 m/s$

We have to find the period of the wave.

We know that

Frequency= $\nu=\frac{v}{\lambda}$

Using the formula

Frequency = $\frac{1522}{3.3\times 10^{-2}}=4.6\times 10^{4}$ Hz

Time period= $\frac{1}{4.6\times 10^4}=0.22\times 10^{-4}\times \frac{10}{10^1}=2.2\times 10^{-4-1}=2.2\times 10^{-5}s$

Using identity: $\frac{a^x}{a^y}=a^{x-y}$

Hence, the time period of the wave= $2.2\times 10^{-5} s$

4 0

3 years ago

Please hurry this is urgent right answers only!!!!!

dem82 [27]

Explanation:

if two individual forces are of equal magnitude and opposite direction, then the force is said to be balanced. when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.

6 0

3 years ago

A star becomes a red giant and its surface temperature cools from 6000 K to 3000 K. Its peak wavelength originally was 483 nm. W

grin007 [14]

Answer: Peak wavelength

{lambda max}

= 9.7*EXP{-7}meter

Which is approximately,

1 micro-meter.

Explanation: lambda{max} which is peak wavelength is inversely proportional to temperature {T}.This is given by the wiens displacement law.

Lambda max

=max displacement{Xmax} / T

For the first case at T = 6000K

Lambda max = 483 nano-meter

=483*EXP{-9}meter.

So let's solve for max displacement {Xmax}.

Xmax = T*lambda max

= 6000*483*EXP{-9}

=2.898*EXP{-3}kelvin-meter

Xmax would be constant during Temperature change.

Therefore lambda max at 3000K would be,

Lambda max

= {2.898*EXP{-3} K-m} / 3000K

= 9.7*EXP{-7} meter

Which is approximately,

1*EXP{-6} meter= 1 micro-meter

NOTE: EXP used here means 10^.

8 0

3 years ago