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3 years ago

The speed of light is now defined to be c-2.99792458 x 10^8 m/s

Physics

2 answers:

Harman [31]3 years ago

8 0

Yes, that statement is loaded with veracity, and is true as well. Did you have a question to ask ?

Lesechka [4]3 years ago

7 0

Answer:

Exact speed of light = 299792458 m/s

Speed taken in numericals = 3 × 10^8 m/s

Speed in scientific notation = 2.99792458 x 10^8 m/s

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4 years ago

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A person standing 1.20 m from a portable speaker hears its sound at an intensity of 5.50 ✕ 10−3 W/m2. HINT (a) Find the correspo

iris [78.8K]

Answer:

PART A)

L = 97.4 dB

PART B)

$I = 6.11 \times 10^{-6} W/m^2$

PART C)

L = 67.9 dB

Explanation:

PART A)

level of sound is given as

$L = 10 Log\frac{I}{I_o}$

now we have

$L = 10 Log\frac{5.50\times 10^{-3}}{10^{-12}}$

$L = 97.4 dB$

PART B)

Since source is a spherical source

so here the intensity of sound is inversely depends on the square of the distance from the source

$\frac{I_2}{I_1} = \frac{r_1^2}{r_2^2}$

$\frac{I_2}{5.50 \times 10^-3} = \frac{1.20^2}{36^2}$

$I_2 = 6.11 \times 10^{-6} W/m^2$

PART C)

level of sound is given as

$L = 10 Log\frac{I}{I_o}$

now we have

$L = 10 Log\frac{6.11\times 10^{-6}}{10^{-12}}$

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3 years ago

A cable passes over a pulley. Because the cable grips the pulley and the pulley has nonzero mass, the tension in the cable is no

topjm [15]

Answer:

$\alpha=214.8 rad/s^2$

Explanation:

We are given that

$F_1=137 N$

$F_2=43 N$

Net force=F= $F_1-F_2=137-43=94 N$

Mass,m=1.21 kg

Radius,r=0.723 m

We have to find the magnitude of its angular acceleration.

Moment of inertia , $I=\frac{1}{2}mr^2$

Substitute the values

Torque , $\tau=I\alpha$

$F_{net}\times r=\frac{1}{2}mr^2\alpha$

$\alpha=\frac{2F_{net}}{mr}$

$\alpha=\frac{2\times 94}{1.21\times 0.723}$

$\alpha=214.8 rad/s^2$

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3 years ago

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aleksandrvk [35]

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