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adell [148]
2 years ago
5

How many meters across is a road sign that has an angular size of 120 arcseconds and is 1 km away?

Physics
1 answer:
myrzilka [38]2 years ago
8 0
That’s the one I’m struggling withhhh aswellll
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06
Novosadov [1.4K]

D

Explanation:

The are the same but difference

8 0
3 years ago
An electric motor does 900j of work for 8 hours. Calculate the power used​
nataly862011 [7]

Answer:

0.031 W

Explanation:

The power used is equal to the rate of work done:

P=\frac{W}{t}

where

P is the power

W is the work done

t is the time taken to do the work W

In this problem, we have:

W = 900 J is the work done by the motor

t = 8 h is the time taken

We have to convert the time into SI units; keeping in mind that

1 hour = 3600 s

We have

t=8\cdot 3600 =28,800 s

And therefore, the power used is

W=\frac{900}{28800}=0.031 W

6 0
3 years ago
1pt Which is an observation? O A. A person hears the song of a bird. OB. A person suggests that bird calls are a means of commun
Doss [256]

Answer:

D

Explanation:

he describes as he writes them down

3 0
3 years ago
Which condition must be met in order for an equation to be balanced?
vitfil [10]

Answer:

There must be an equal amount of each element on both sides of the equation. Hope this helps and please marks as the brainliest.

Explanation:

4 0
3 years ago
A drop of oil of volume 10m it spread out on water to make a circular firm of radius 10m calculate the tickness of the firm
Effectus [21]

Answer:

h = 3.1 cm

Explanation:

Given that,

The volume of a oil drop, V = 10 m

Radius, r = 10 m

We need to find the thickness of the film. The film is in the form of a cylinder whose volume is as follows :

V=\pi r^2 h\\\\h=\dfrac{V}{\pi r^2}\\\\h=\dfrac{10}{\pi \times 10^2}\\\\h=0.031\ m\\\\h=3.1\ cm

So, the thickness of the film is equal to 3.1 cm.

8 0
3 years ago
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