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Andrew [12]
3 years ago
14

How is an electromagnet different from a bar magnet?

Physics
2 answers:
liberstina [14]3 years ago
7 0
C. is the answer please mark me brainliest I really need it
Reptile [31]3 years ago
5 0
The answer for the question is c


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The ramp on the back of a moving van is in example of what type <br> simple machine
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Compute the dot product of the vectors u and v​, and find the angle between the vectors. Bold v equals 7 Bold i minus Bold j and
OLga [1]

Answer:

\theta = 106.3 degree

Explanation:

As we know that

\vec w = -\hat i + 7\hat j

\vec v = 7\hat i - \hat j

also we know that

\vec v. \vec w = -14

it is given as

\vec v. \vec w = (-\hat i + 7\hat j).(7\hat i - \hat j)

\vec v. \vec w = - 7 - 7 = -14

also we can find the magnitude of two vectors as

|v| = \sqrt{(-1)^2 + (7)^2}

|v| = \sqrt{50}

similarly we have

|w| = \sqrt{(7^2) + (-1)^2}

|w| = \sqrt{50}

now we know the formula of dot product as

\vec v. \vec w = |v||w| cos\theta

-14 = (\sqrt{50})^2cos\theta

\theta = cos^{-1}(\frac{-14}{50})

\theta = 106.3 degree

3 0
3 years ago
How does a change in thermal energy cause matter to change from one state to another?
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Which is an example of a physical change
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Hope that helps!!
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