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3 years ago

7. How many forces are acting on this object? * Fnorm Ffrict Fapp Fgray Å

Physics

1 answer:

faust18 [17]3 years ago

4 0

Answer:

Explanation:

As you can see in the free body diagram there are 4 forces acting on the body.

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What do astronomers mean by light pollution?

Margarita [4]

Answer:

a. Light pollution refers to light used for human activities that brightens the sky and hinders astronomical observations.

Explanation:

Light pollution is due to the excessive and misdirected use of artificial light. Light bulbs are often design in an incorrect way, since a great part of its light is not completely directed to the ground and an important percentage is emitted to the sky in where will be scattered and reflected back to ground by the particles in the atmosphere. That brings as an effect a sky glow, therefore the visibility of astronomical objects will be extremely reduce.

Hence, professional astronomical research and amateur observations will be affected. Light pollution has a negative impact on bird migration at night and in the health of difference species, humans also.

8 0

3 years ago

Read 2 more answers

Two spacecraft are both 10 million kilometers from a star. The total power output of the star is 4 x 1025 W. Spacecraft 1 has a

Ksenya-84 [330]

The concept of power is given by the relationship between intensity and area, that is to say that power is defined as

$P = A*I$

Our values are given under the condition of,

$r_1 = 18m$

$r_2 = m$

The power is proportional to the Area, and in turn, we know that the Area of a circle is the product between $\pi$ times the radius squared, therefore the power is proportional to the radius squared.

$\text{Power} \propto r^2$

For both panels we would have to

$\frac{\text{Power by panel 1}}{\text{Power by panel 2}} = \frac{r_1^2}{r_2^2}$

$\frac{P_1}{P_2} = (\frac{18}{6})^2$

$\frac{P_1}{P_2} = 9$

Therefore the correct option is option C.9

5 0

3 years ago

Read 2 more answers

Why can objects be made to float in a magnetic field?

dimulka [17.4K]

I would say that the answer is C

6 0

3 years ago

What is the frequency of light with a wavelength of 3 meters?

blsea [12.9K]

Answer:

3x10^8=3f f=1x10^8 It think it is hopeful

7 0

3 years ago

An acorn falls 10 meters in 4 seconds. What is its average velocity?

quester [9]

Answer:

Average velocity, V = 2.5m/s

Explanation:

Given the following data

Displacement = 10m

Time = 4secs

Average velocity can be defined as the rate of change in displacement with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, average velocity is given by the equation;

$Velocity = \frac{displacement}{time}$

$V = \frac{d}{t}$

Substituting into the above equation;

$V = \frac{10}{4}$

Average velocity, V = 2.5m/s

3 0

2 years ago