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inn [45]
3 years ago
10

As you walk to class with a constant speed of 1.60 m/s, you are moving in a direction that is 15.0° north of east. How long does

it take you to move (a) 20.0 m east or (b) 30.0 m north?
Physics
1 answer:
Alina [70]3 years ago
4 0
<h2>a)Time taken is 12.90 seconds</h2><h2>b) Time taken is 72.46 seconds</h2>

Explanation:

Let east be positive x axis and north be positive y axis

Speed = 1.60 m/s in a direction that is 15.0° north of east.

Speed, v = 1.60 cos 15 i + 1.60 sin 15 j = 1.55  i + 0.414 j m/s

a) We need to find time taken to travel 20 m along east

Speed along east = 1.55 m/s

Distance = Speed x Time

20 = 1.55 x Time

Time = 12.90 seconds

Time taken is 12.90 seconds

b) We need to find time taken to travel 30 m along north

Speed along north = 0.414 m/s

Distance = Speed x Time

30 = 0.414 x Time

Time = 72.46 seconds

Time taken is 72.46 seconds

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I think the correct answer would be that the temperature of the clouds that made the very first stars where thought to be higher since the clouds are made up of hydrogen and helium. Hope this answers the question. Have a nice day.
8 0
3 years ago
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650 N boy and a 419 N girl sit on a 150 N porch swing that is 2.0 m long. If the swing is supported by a chain at each end, what
Sergio039 [100]

The tension in the two chains T1 and T2 is 676.65 N and 542.53 N respectively.

<h3>Principle of moments</h3>

The Principle of Moments states that when a body is in equip, the sum of clockwise moment about a point is equal to the sum of anticlockwise moment about the same point.

The formula for calculating moment is given below:

  • Moment = Force × perpendicular distance from the pivot

<h3>Calculating the tension in the chains</h3>

From the principle of moments:

Let tension in chain 1 be T1 and tension in chain 2 be T2.

T1 + T2 = 150 + 650 + 419

T1 + T2 =1219

Taking all distances from chain 1,

Sum of Moments = 0

419 × 0.5 + 150 × 0.85 + 650 × 0.9 = T2 × 1.7

T2 = 922/17

T2 = 542.35 N

Then, T1 = 1219 - 542.35

T1 = 676.65 N

Therefore, the tension in the two chains T1 and T2 is 676.65 N and 542.53 N respectively.

Learn more about tension and moments at: brainly.com/question/187404

brainly.com/question/14303536

7 0
2 years ago
HELP!!!! WILL MARK BRAINLIEST!!!! IF YOU LEAVE AN ANSWER EXPLAIN! THANKS
Travka [436]

Answer:

the answer is C

Explanation:

we know this because if you compare the graphs and look at the direction. it isn't always in the explanation or the few sentences they gave you at the top. also, look at the waves, you can see in Davids drawing that it is directly straight up, A and B do not represent that. A isn't even a valid answer. Notice also in A that the arrow is going in the completely different direction than in Davids drawing. B is also going a different direction even though it is only turned a little bit although if it was straight up like Davids drawing then it would most likely be a correct answer. C does have one arrow going a different direction but look at how it has two, showing in which if the waves were to turn then the arrow is still valid

7 0
2 years ago
Plz help it really easy
Mrac [35]

The answer is high to low.

3 0
3 years ago
Read 2 more answers
What is a list of solid mixtures in a classroom?
OLEGan [10]
Well,
1.} book
2.} computer
3.} desk
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6.} eraser
7.} dry erase board
8.} ruler
9.} calculator 
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6 0
3 years ago
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