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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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To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal.
Yuri [45]

Answer: The height of the cloud = 394.55 m

Explanation:

The observer is 500m away from the spotlight.

Let x be the distance from the observer to the interception of the segment of the height, h with the floor. The equations are thus:

Tan 45° = h/x ... eq1

Tan 75° = h/(500- x ) ... eq2

From eq 1, Tan 45° = 1, therefore eq1 becomes:

h = x ... eq3

Put eq3 into eq2

Tan 75° = h/(500- h)

h = ( 500 - h ) Tan 75°

h = 500Tan 75° - hTan75°

h + h Tan 75° = 500 Tan 75°

h ( 1 + Tan 75° ) = 500 Tan75°

h = 500Tan75°/ (1 + Tan 75°)

h= 1866.02 / 4.73

h = 394.55m

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3 years ago
A b c or d for not heat
Levart [38]

Answer:

a

Explanation:

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What does the following figure illustrate?
Ilia_Sergeevich [38]
The answer to this question is C
4 0
3 years ago
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A bend in a river shaped like a loop is called a(n) ________________
Llana [10]
This loop-like bend in a river is called a meander
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A worker pushes a 7 kg shipping box along a roller track. Assume friction is small enough to be ignored because of the rollers.
Bingel [31]

Answer:

a) Fₓ = 23.5 N

b) Net force = Fₓ

Explanation:

An image of the question as described is attached to this solution.

From the image attached, the forces acting on the box include the weight of the box, the normal reaction of the surface on the box, the applied force on the box and the Frictional force opposing the motion of the box (which is negligible and equal to 0)

a) From the diagram, the horizontal component of the force is

Fₓ = 25 cos 20° = 23.49 N = 25 N

b) Again, from the diagram attached, doing a force balance on the box, in the horizontal direction, we obtain

Net force = Fₓ - Frictional force

But frictional force is 0 N

Net force = Fₓ

Hope this Helps!!!

6 0
3 years ago
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