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1 year ago

Why do some quasars have red shifts greater than 1?.

Physics

1 answer:

slega [8]1 year ago

8 0

Answer:

They are very distant.

Explanation:

With relativistic red shifts that take into account dilation of space-time, as Einstein predicted.

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A moving object has a kinetic energy of 150J and a momentum of 20.3kgxm/s find the speed of the object in m/s

Irina-Kira [14]

Answer:

$v = 14.78m/s$

Explanation:

Given

$KE = 150J$

$p = 20.3kgm/s$

Required

Determine the object's speed

Kinetic Energy is calculated as:

$KE = \frac{1}{2}mv^2$

Make m the subject

$m = \frac{2KE}{v^2}$

Momentum is calculated as:

$p = mv$

Make m the subject

$m = \frac{p}{v}$

So, we have:

$m = \frac{p}{v}$ and $m = \frac{2KE}{v^2}$

Equate both expressions: $m = m$

$\frac{2KE}{v^2} = \frac{p}{v}$

Multiply both sides by v

$v * \frac{2KE}{v^2} = \frac{p}{v}*v$

$\frac{2KE}{v} = p$

Make v the subject

$v = \frac{2KE}{p}$

Substitute $KE = 150J$ and $p = 20.3kgm/s$

$v = \frac{2 * 150}{20.3}$

$v = \frac{300}{20.3}$

$v = 14.78m/s$

5 0

2 years ago

The sputnik one satellite orbiting earth mass equals 5.98×10 to the 24th power kilograms in a circle of radius 6.96×10 to the si

nika2105 [10]

Answer:

7572 m/s

Explanation:

The force between two masses separated by a distance r is given as:

$F=G\frac{m_1m_2}{r^2}$

Where F is the attractive force between 2 masses, m1 and m2, r is the distance between the centres of the masses and G is the universal gravitation constant, which is $6.674*10^-11 Nm^2/kg^2$

The mass of the earth ( $m_1$ ) is far greater than the mass of the sputnik ( $m_2$ ). Therefore $m_1m_2=m_1$ . The mass of the sputnik is neglected, therefore:

$F=G\frac{m_1}{r^2}=\frac{(6.674*10^{-11})(5.98*10^{24})}{(6.96*10^6)^2} = 8.2389N$

But F is actually centripetal acceleration, a = v²/r

$8.2389 = v^2 / 6.96*10^6\\v=7572m/s$

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2 years ago

Difference between the fertility rate and mortality rate of developed and least development countries

dybincka [34]

Answer:

The replacement fertility rate is indeed only slightly above 2.0 births per woman for most industrialized countries (2.075 in the UK, for example), but ranges from 2.5 to 3.3 in developing countries because of higher mortality rates, especially child mortality. pls give brainlest

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2 years ago

If the starting population of 5 rabbits grows at 200% each year, how many will there be 50 years?

just olya [345]

Answer:

Alot of god dam rabbits

Explanation:

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2 years ago

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Which of the following is an example of technology influencing science?

FinnZ [79.3K]

Answer:A and C

Explanation:

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2 years ago