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erica [24]
3 years ago
10

Pouvez vous m'aider dans ce devoir sil vous plait.​

Physics
1 answer:
ahrayia [7]3 years ago
8 0

in english please

i don't understand actually

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A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.7 cm fro
Savatey [412]

Answer:N=322.53 rpm

Explanation:

Given

Linear velocity (v)=1.25 m/s

Position from center is 3.7 cm

we know

v=\omega \times r

1.25\times 100=\omega \times 3.7

\omega =\frac{125}{3.7}=33.78

and \frac{2\pi N}{60}=\omega

N=\frac{\omega \times 60}{2\pi }

N=\frac{33.78\times 60}{2\pi }

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3 years ago
A proton and an electron traveling with the same velocity enter a uniform electric field. compared to the acceleration of the pr
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The acceleration of the electron is larger than the acceleration of the proton.

The reason for this is that the mass of the electron is smaller (about 1000 times smaller) than the mass of the proton. The two particles have same charge (e), so they experience the same force under the same electric field E:
F=eE 
However, according to Newton's second law, the force is the product between the mass particle, m, and its acceleration, a:
F=ma 
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a= \frac{F}{m}
we said that the force exerted on the two particles, F, is the same, while the mass of the electron is smaller: therefore, from the last formula we see that the acceleration of the electron will be larger than that of the proton.

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3 years ago
What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot water
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Answer:

c

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this equestion is about the safety

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3 years ago
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When you set something down on the ground wht kind of work are your arms doing?
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When we set something down on the ground, the kind of work that our arms doing is : negative apex
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hope this helps
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