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Amanda [17]
3 years ago
13

An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second s

tar. Which of the following is a valid conclusion about the first star?
It is larger than the second star.
It is smaller than the second star.
It is older than the second star.
It is younger than the second star.
Physics
2 answers:
Dmitrij [34]3 years ago
6 0
It is a younger then the second star.

Novosadov [1.4K]3 years ago
5 0

Answer:

It is larger than the second star.

It is younger than the second star.

Explanation:

The star's actual brightness depends on two factors: size and surface temperature. If we take two stars of the same size, hotter star would look brighter. If we take two stars with the same surface temperature, bigger star would like brighter.

In the given scenario, two options can be correct. The first star might be larger than the second one or it can be younger as younger stars are hotter.

You might be interested in
3 PHYSICAL SCIENCE: In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and
rjkz [21]
Some sort of magnetic metal

Metals are heavier per cubic unit than other materials such as air or water, and also are much more magnetic than other materials
7 0
4 years ago
Two parallel-plate capacitors, identical except that one has twice the plate separation of the other, are charged by the same vo
erik [133]

Answer:

The capacitor having less distance of separation has a stronger electric field.

Explanation:

The capacitors are identical and only difference between them is that one has twice the plate separation of the other. Therefore, capacitance of the given capacitors C1 and C2 is,

C1= Aε/d  and C2=Aε/2d

The charges Q1 and Q2 on the capacitors of capacitance C1 and C2 respectively, is then given by the equation,

Q1=VC1

Q1=VAε/d

Q2=VC2

Q2=VAε/2d

Therefore, the surface charge density σ1 and σ2 for the capacitors is,

σ1=Q1/A

σ1=VAε/(d*A)

σ1=Vε/d

Similarly,

σ2=Q2/A

σ2=Vε/2d

The electric field between the plates is directly proportional to the surface charge density. And so electric field is inversely proportional to the distance of separation. Therefore the capacitor whose distance of separation is less has a stronger electric field.

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8 0
2 years ago
If the wheels lock when braking suddenly the vehicle: a:loses traction b:lose steering wheel ability c: gain speed slightly d:ga
kolezko [41]

Answer:

b

Explanation:

8 0
4 years ago
What is the density of a 2 gallon milk jug that has a mass of 2.0 kg? Answer should be in g/ml.
kirill [66]

volume of milk is given as

V = 2 Gallon

we will convert it into mL unit

V = 2 Gal = 7570.82 ml

mass of the milk m = 2kg

m = 2000 g

now for the density we can use

\rho = \frac{m}{V}

\rho = \frac{2000}{7570.82}

\rho = 0.264 g/mL

<em>so the density is 0.264 g/mL for above sample</em>

8 0
4 years ago
Three forces with magnitudes of 95 pounds, 75 pounds, and 146 pounds act on an object at angles 100°, 200°, and 300°, respective
VladimirAG [237]

Answer:

Explanation:

We shall represent all the forces in vector form .

Force of 95 pounds

F₁ = 95cos100 i + 95sin100j

= -16.5 i +93.55 j

force of 75 pounds

F₂ = 75cos200 + 75sin200j

= -70.47 i - 25.65 j

force of 146 pounds

F₃ = 146cos300 i + 146sin300j

= 73i -126.44 j

Resultant force

R = F₁+ F₂ + F₃

=  -16.5 i +93.55 j  -70.47 i - 25.65 j +73i -126.44 j

= -13.97 i - 58.54 j

Magnitude of R = √ ( 13.97² + 58.54² )

= 60.18

If Ф be angle of resultant with  axis

tanФ = - 58.54 / -13.97

Ф = 76.57 + 180 = 256.57 , because both  x and y components are negative. So the resultant will be in third quadrant.

7 0
3 years ago
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