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7nadin3 [17]
2 years ago
13

Why are electromagnets more useful than permanent magnets in many

Physics
2 answers:
Likurg_2 [28]2 years ago
5 0

Answer: Electromagnets can be turned on and off by controlling the current

Explanation:

Tasya [4]2 years ago
5 0

B. By controlling the current, electromagnets can be turned on and off

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During a medical evaluation, the doctor can __________.
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3 years ago
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Find the magnitude of the sum of two vectors; A is 5 km , and B is 7 , when the angle btween them is 120
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Answer: 6.24 km

Explanation:

Given

The magnitude of the first vector(say) \left |  a\right |=5\ km

the magnitude of the second vector(say) \left |  b\right |=7\ km

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The resultant vector magnitude is given by

\left |  \vec{R}\right |=\sqrt{a^2+b^2+2ab\cos \theta}

\left |  \vec{R}\right |=\sqrt{5^2+7^2+2\times 5\times 7\cdot \cos 120^{\circ}}\\\left |  \vec{R}\right |=\sqrt{74-35}=\sqrt{39}\\\left |  \vec{R}\right |=6.24\ km

4 0
2 years ago
a trolley of mass 20kg was originally at rest on a smoth horizontal surface. bu how much will it accelerate if a pulling force o
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a car with a mass of 100 kg is stopped on the side of the road after getting a flat tire. the two people that were riding in the
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