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3 years ago

How this induced force can be increased? Write three ways.

1 answer:

8 0

Strength of induced current increased when strength of magnetic field increases. It will also increase when the number of turns are increased or if the speed of conductor increases

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In general, if a sound has intensity of β dB at 1 m from the source, at what distance from the source would the decibel level de

Tpy6a [65]

Answer: The required distance is given by

$r_2=1\text{ m}\cdot 10^\frac{\beta}{20}.$

Explanation: The sound intensity in dB is given by the formula

$\beta \text{ dB}=10\log\frac{I}{I_0}$

where $I_0$ is the hearing threshold in absolute units and $I$ is the absolute intensity of the sound which depends on the distance. In general, for two distances $r_1$ and $r_2$ we have that

$\frac{I(r_1)}{I(r_2)}=\frac{r_2^2}{r_1^2}=\left(\frac{r_2}{r_1}\right)^2.$

Now let us take $r_1=1\text{ m}$ and let $r_2$ be the required distance. We have

$\beta \text{ dB}=10\log\frac{I(r_1)}{I_0},\quad 0\text{ db}=10\log\frac{I(r_2)}{I_0}.$

Exponentiating these equations we obtain

$10^{\frac{\beta}{10}}=\frac{I(r_1)}{I_0},\quad 10^0=1=\frac{I(r_2)}{I_0}.$

Dividing them

$\frac{I(r_1)}{I(r_2)}=10^\frac{\beta}{10}.$

Using the previously stated identity

$\frac{r_2^2}{r_1^2}=10^\frac{\beta}{10}\Rightarrow r_2=r_110^\frac{\beta}{20}=1\text{ m}\cdot 10^\frac{\beta}{10}$

Now if we use the given example where $\beta=11$ we have

$r_2=1\text{ m}\cdot 10^{\frac{11}{20}}=3.55\text{ m}.$

7 0

3 years ago

Which term describes the time it takes for half of a radioactive elements atoms to decay?

devlian [24]

I think that is half-life

6 0

4 years ago

A hockey player has an acceleration of −3.1 m/s2. How long does it take him to come to a complete stop from a speed of 13 m/s?

ddd [48]

Use this formula:

final speed = initial speed + acceleration * time
0 = 13 - 3.1*t, t = 13/3.1 = 4.19354838709677 s = 4.2 seconds, might be enough since ur given 1 decimal place precision

6 0

4 years ago

Different Betweens in Current Source And Voltage Source.

ira [324]

Answer:

The various types of sources available in the electrical network are voltage source and current sources. A voltage source has a forcing function of emf whereas the current source has a forcing function of current.

4 0

2 years ago

Read 2 more answers

What is the resistance of a toaster that uses 2A when connected to a 120V power source?

denis23 [38]

Answer:

60 ohms

Explanation:

From Ohm's Law:

V = IR

Where V = 120volts

I = 2A

R = ?

Note that R,V and I represents resistance, voltage and current respectively.

Substituting the above values into the formula.

V = IR

120v = 2×R

120= 2R

Making R the subject

R =120/2

R = 60 ohms

Hence the resistance of the toaster will be 60 ohms.

8 0

3 years ago