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3 years ago

Suppose a star is 500 light- years away from earth is moved to be 600 light - years away. Which statement is correct?

Physics

2 answers:

mina [271]3 years ago

5 0

D. the value of the star's apparent magnitude increases

ExtremeBDS [4]3 years ago

4 0

Answer:

Explanation:

Apparent magnitude of a star is the brightness of the star observed from the Earth at its actual position. The value extends in both positive and negative direction. Increasing value of apparent magnitude in positive direction means that the brightness is decreasing. Absolute magnitude is the apparent magnitude of the star when the star is at 10 parsecs distance away from earth.

It is given that a star is 500 light-years away from earth moved to be 600 light years away. The value of absolute magnitude of the star does not changes. But the value of apparent magnitude changes with the distance. It would increase as the distance would increase. The star would appear less bright.

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AnnZ [28]

Answer:

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answer : 4 μm

Explanation:

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3 years ago

The net effect of each cycle of the sodium-potassium pump is to ____.? ?decrease the number of positively charged ions within th

stealth61 [152]

The correct answer may be A

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3 years ago

A flow is isentropically expanded to supersonic speeds in a convergent-divergent nozzle. The reservoir and exit pressures are 1.

Kamila [148]

Answer:

Ae/A* = 1.115

Explanation:

Let the reservoir pressure be $p_0$

Let the exit pressure be $p_e$

Ratio of reservoir pressure and exit pressure

$\frac{p_o}{p_e} = \frac{1}{0.3143}$

= 3.182

For the above value of pressure ratio

Obtain the area ratio from the isentropic flow table

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6 0

3 years ago

I just need number 2

il63 [147K]

We will apply the conservation of linear momentum to answer this question.

Whenever there is an interaction between any number of objects, the total momentum before is the same as the total momentum after. For simplicity's sake we mostly use this equation to keep track of the momenta of two objects before and after a collision:

m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

Note that v₁ and v₁' is the velocity of m₁ before and after the collision.

Let's choose m₁ and v₁ to represent the bullet's mass and velocity.

m₂ and v₂ represents the wood block's mass and velocity.

The bullet and wood will stick together after the collision, so their final velocities will be the same. v₁' = v₂'. We can simplify the equation by replacing these terms with a single term v'

m₁v₁ + m₂v₂ = m₁v' + m₂v'

m₁v₁ + m₂v₂ = (m₁+m₂)v'

Let's assume the wood block is initially at rest, so v₂ is 0. We can use this to further simplify the equation.

m₁v₁ = (m₁+m₂)v'

Here are the given values:

m₁ = 0.005kg

v₁ = 500m/s

m₂ = 5kg

Plug in the values and solve for v'

0.005×500 = (0.005+5)v'

v' = 0.4995m/s

v' ≅ 0.5m/s

4 0

3 years ago

What are some ways to improve heat islands temperature

Vera_Pavlovna [14]

Answer:

1. Increase shade around your home. Planting trees and other vegetation

2.lowers surface and air temperatures by providing shade and cooling through evapotranspiration.

3.Install green roofs.

4.Install cool roofs.

5.Use energy-efficient appliances and equipment.

6.Check on your friends, family, and neighbors.

Explanation:

3 0

3 years ago