1.- Escribir los siguientes números aplicando la notación científica:

By what factor does the sound intensity increase if the sound intensity level increases from 60 db to 61 db?

tiny-mole [99]

Answer:

$\frac{I_{2}}{I_{1}} = 10^{0.1}$

Explanation:

The sound intensity level β can be mathematically defined as

$\beta(dB) = 10log_{10}(\frac{I}{I_{o} } )$

where $I_{o}$ is the reference intensity and is equal to $10^{-12}$ $W/m^{2}$ .

Now,

$\beta_{2} - \beta_{1} = 10 log\frac{I_{2} }{I_{o}} - 10 log\frac{I_{1} }{I_{o}}\\62-60= 10log(\frac{\frac{I_{2} }{I_{o} } }{\frac{I_{1} }{I_{o} } } )\\1=10log(\frac{I_{2} }{I_{1} } )\\\\\frac{I_{2} }{I_{1} }=10^{0.1}$

6 0

4 years ago

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway

vesna_86 [32]

Answer:

Average velocity = 1.69 m/s

Average speed = 5.09 m/s

Explanation:

Given that

Horse cover 37 m in 9.1 sec and 18.5 m in 1.8 sec.

As we know that

Average velocity = Displacement / Total time

Average speed = Total distance / Total time

Average velocity:

Average velocity = Displacement / Total time

Total displacement = 37 - 18.5 = 18.5 m

Total time = 9.1 + 1.8 =10.9 s

Average velocity = Displacement / Total time

Average velocity = 18.5 / 10.9

Average velocity = 1.69 m/s

Average speed:

Average speed = Total distance/ Total time

Total distance = 37 + 18.5 = 55.5 m

Total time = 9.1 + 1.8 =10.9 s

Average speed = Total distance/ Total time

Average speed = 55.5 / 10.9

Average speed = 5.09 m/s

3 0

3 years ago

How does a water molecule transfer from the ocean to form part of a cloud in the atmosphere?

Luden [163]

D.
The molecule escapes the ocean via evaporation and then becomes part of a cloud via condensation.

8 0

4 years ago

A piece of Nichrome wire has a radius of 7.1 x 10-4 m. It is used in a laboratory to make a heater that dissipates 3.20×102 W of

bekas [8.4K]

Answer:

the length of the Nichrome wire is 59.88 m

Explanation:

The resistance of a wire is determined by:

P = V² / R or R = V² / P

where

V is the voltage
R is the resistance
P is the power

We also know that

R = PL / A

where

A is the area and it is equal to πr²
P = 3.20 × 10² W

Therefore, the length of the Nichrome wire is

L = RA / ρ

L = (V²/P)(πr²) / ρ

L = V²πr² / ρ P

L = (110 V)²(π)(7.1 × 10⁻⁴ m)² / (3.2 × 10² W)(100 × 10⁻⁸ Ω·m)

L = 59.88 m

7 0

4 years ago

Consider a polymer formed by a chain process. By how much does the kinetic chain length change if the concentration of initiator

o-na [289]

Answer: it’s in the picture
Explanation: look at the picture

7 0

3 years ago