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Ket [755]
3 years ago
7

REAL ANSWER = BRAINLIST LOOK AT PICS ATTACHED

Physics
1 answer:
inysia [295]3 years ago
5 0

Answer:

there are no pictures attached.

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The x component of vector is -27.3 m and the y component is +43.6 m. (a) What is the magnitude of ? (b) What is the angle betwee
lara [203]

Answer:51.44 units

Explanation:

Given

x component of vector is -27.3\hat{i}

y component of vector is 43.6\hat{j}

so position vector is

r=-27.3\hat{i}+43.6\hat{j}

Magnitude of vector is

|r|=\sqrt{27.3^2+43.6^2}

|r|=\sqrt{2646.25}

|r|=51.44 units

Direction

tan\theta =\frac{43.6}{-27.3}=-1.597

vector is in 2nd quadrant thus

180-\theta =57.94

\theta =122.06^{\circ}

4 0
3 years ago
Why do scientists believe that dark matter exists even though it cannot be seen?
poizon [28]
Because although they cannot see it, they can see it's influence on objects that can be seen, and it's effects.
3 0
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What is the name of the units that are normally used to measure energy?
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The basic unit of energy is a joule. Kill calories measure the energy available in food.

8 0
3 years ago
A sound from a source has an intensity of 270 dB when it is 1 m from the source.
Rufina [12.5K]
Remember that sound intensity decreases in inverse proportion to the distance squared. So, to solve this we are going to use the inverse square formula: \frac{I_{2} }{I_{1}}= (\frac{d{2} }{d_{1}})^2
where
I_{2} is the intensity at distance 2
I_{1} is the intensity at distance 1
d_{2} is distance 2
d_{1} is distance 1

We can infer for our problem that I_{1}=270, d_{1}=1, and d_{2}=3. Lets replace those values in our formula to find I_{2}:
\frac{I_{2} }{I_{1}}= (\frac{d{2} }{d_{1}})^2
\frac{I_{2} }{270} =( \frac{1}{3} )^2
\frac{I_{2} }{270} = \frac{1}{9}
I_{2}= \frac{270}{9}
I_{2}=30 dB

We can conclude that the intensity of the sound when is <span>3 m from the source is 30 dB.</span>
8 0
3 years ago
Explain briefly how moving electric charges at an atomic level produce magnetically polarized domains in a sample of iron, and h
SVETLANKA909090 [29]
1.Iron atoms tend to form regions, clusters. These are what become magnetized and then affected by magnetic fields
Answer 2
.When two magnets are brought near each other, like poles repel; opposite poles attract.
2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.
6 0
3 years ago
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