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3 years ago

Does a star's apparent brightness depend only on its distance from earth?

2 answers:

5 0

<span>The luminosity of a star, on the other hand, is the amount of light it emits
from its surface..... However, apparent brightness is not an intrinsic property of
the star; it depends on your location</span>

Arisa [49]3 years ago

4 0

I dont think so. It also probably matters what type of str it is

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a person can throw a 300 gram ball at 25 m/s the maximum height the person can throw the ball on Earth?

jolli1 [7]

Answer:

Elevation =31.85[m]

Explanation:

We can solve this problem by using the principle of energy conservation. This consists of transforming kinetic energy into potential energy or vice versa. For this specific case is the transformation of kinetic energy to potential energy.

We need to first identify all the input data, and establish a condition or a point where the potential energy is zero.

The point where the ball is thrown shall be taken as a reference point of potential energy.

$E_{p} = E_{k} \\where:\\E_{p}= potential energy [J]\\ E_{k}= kinetic energy [J]$

m = mass of the ball = 300 [gr] = 0.3 [kg]

v = initial velocity = 25 [m/s]

$E_{k}=\frac{1}{2} * m* v^{2} \\E_{k}= \frac{1}{2} * 0.3* (25)^{2} \\E_{k}= 93.75 [J]$

$93.75=m*g*h\\where:\\g = gravity = 9.81 [m/s^2]\\h = elevation [m]\\replacing\\h=\frac{E_{k}}{m*g} \\h=\frac{93.75}{.3*9.81} \\h=31.85[m]$

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4 years ago

If a car's mass is 439 kg, what is its weight on earth?

trasher [3.6K]

The correct answer is B.

8 0

4 years ago

Which of the following statements are true of solids?

harina [27]

B. The Particles Have Less Kinetic Energy than those of..

7 0

3 years ago

Read 2 more answers

How do I answer number 4? Please help x

4vir4ik [10]

Explanation:

Efficiency is the ratio of energy out to energy in.

e = Eout / Ein

0.52 = 800 J / Ein

Ein ≈ 1538 J

Round as needed.

8 0

3 years ago

What makes comets different from asteroids and meteoroids? Question 8 options: A.They don't consist of ice. B.They travel in spa

Rus_ich [418]

Answer:

Explanation:

Comet consist of a body of ice, rock and dust that can be several miles in diameter and orbits the sun. Debris from comets is the main source of many meteoroids.

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3 years ago