3 years ago

What is a relatively soft layer of upper mantle called?

Physics

1 answer:

brilliants [131]3 years ago

3 0

The answer is asthenosphere

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an electrically charged particle with mass m, velocity v, and charge q moves in a circle in magnetic field b. what is the formul

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Answer:

$r=\frac {mv}{qb}$

Explanation:

In this case, since the charged particle moves in circular motion, the centripetal force is equivalent to the magnetic force.

$\frac {mv^{2}}{r}=qvb\\\frac {mv}{r}=qb\\r=\frac {mv}{qb}$

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The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that

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Answer: The intensity level of sound in the bedroom is 80dB

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Intensity of lawn mower at r=1m is 100dB

Beta1= 10dBlog(I1/Io)

100dB= 10dB log(I1/Io)

10^10= I1/Io

I1= Io(10^10)

10^12)×(10^10)= I1

I1=10^-2w/m^2

Intensity of lawn mower at r=20m

I2/I1=(r1/r2)^2 =(1/20)^2

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I2=2.5×10^-3W_m^2

Intensity of 4 lown mowers at 20m fro. Window

= 10dBlog(4I2/Io)

= 10^-4/10^-12

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Using V= vo +at with Vo = 0 and a= 4m/sec2.
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