All categories

3 years ago

if a sine wave representing ac voltage has an effective value of 70 vac what would be the waves peak value

Physics

1 answer:

Morgarella [4.7K]3 years ago

3 0

Answer:

99 V

Explanation:

The effective voltage of an AC current (also called rms voltage) is given by

$V_{rms} = \frac{V_0}{\sqrt{2}}$

where

Vrms is the rms voltage

V0 is the peak voltage

In this problem, we know the effective voltage:

$V_{rms} = 70 V$

Therefore, we can re-arrange the equation to find the peak voltage:

$V_0 = V_{rms} \sqrt{2} =(70 V)(\sqrt{2})=99 V$

You might be interested in

What can affect gravity <br><br> Helpppppp!!!

Anvisha [2.4K]

gravity increases with height. gravity is significantly less on high mountains or tall buildings and increases as we lose height (which is why falling objects speed up) gravity is caused by the Earth spinning. gravity affects things while they are falling but stops when they reach the ground

7 0

3 years ago

- With the device starting from a still position (0 m/s), you drop it, allowing gravity to accelerate it towards the ground at 9

IrinaVladis [17]

Starting velocity (u)=0
acceleration (a) = 9.8
time (t) = 1.5
final velocity (v) =?

v=at+u
v=9.8(1.5)+0
v=14.7m/s2

3 0

3 years ago

The speaker at the concert has the sound intensity level of 100 dB if we listen from the distance 5 m.How far from the speaker d

Mademuasel [1]

Answer:

$28.11m$ far from the speaker the intensity drops to 85 dB.

Explanation:

In the equation for the Decibel scale

$(1). \: \:\beta =10 log(\dfrac{I}{I_0})$

The ratio of the intensities can be written as

$\frac{I}{I_0} = \dfrac{\frac{P}{A} }{\frac{P}{A_0} }$

$\dfrac{I}{I_0} = \dfrac{A_0}{A}.$

And since

$A = 4\pi r^2$

and

$A_0 = 4 \pi r_0^2$ ,

$\dfrac{A_0}{A} = \dfrac{4 \pi r_0^2}{4 \pi r^2} = \dfrac{r_0^2}{r^2}$

meaning

$\dfrac{I}{I_0} = \dfrac{r_0^2}{r^2}.$

Putting this into equation (1), we get:

$\boxed{ (2).\: \: \beta = 10log(\dfrac{r_0^2}{r^2})}$

Now, if the intensity is 100 dB when the distance is 5 meters, we have:

$100dB=10 log(\dfrac{r_02}{(5m)^2})$

$10= log(\dfrac{r_0^2}{25})$

by taking both sides to the exponent:

$10^{10}= \dfrac{r_0^2}{25}$

$r^2 = 25 *10^{10}\\r = 5 *10^5$

Now equation (2) becomes

$\beta = 10log(\dfrac{25*10^{10}}{r^2})$

when the intensity level is 85 dB we have

$85 = 10log(\dfrac{25*10^{10}}{r^2})$

$8.5 = log(\dfrac{25*10^{10}}{r^2})$

take both sides to exponents and we get:

$10^{8.5} =10^{ log(\dfrac{25*10^{10}}{r^2})}$

$10^{8.5} =\dfrac{25*10^{10}}{r^2}$

$r^2 = \dfrac{25*10^{10}}{10^{8.5}}$

$\boxed{r = 28.11m}$

Thus, $28.11m$ far from the speaker the intensity drops to 85 dB.

7 0

3 years ago

A point charge of 6.8 C moves at 6.5 × 104 m/s at an angle of 15° to a magnetic field that has a field strength of 1.4 T. What i

Tamiku [17]

Force on a moving charge is given by

$F = q(v x B)$

Given that

q = 6.8 C

$v = 6.5 * 10^4 m/s$

B = 1.4 T

angle = 15 degree

$F = qvB sin\theta$

$F = 6.8*6.5 * 10^4 * 1.4 * sin15$

$F = 1.6 * 10^5 N$

6 0

3 years ago

Read 2 more answers

A truck covers 40 km with an average speed of 80km/h. Then it travels another 40 km with an average speed of 40 km/h. The averag

Yuliya22 [10]

Answer:

Average speed = 53.33 km/h

Explanation:

Below is the calculation for the average speed:

Given the average speed of for first 40 km = 80km/h

Time taken to cover the first 40 km = Total Distance / average speed

Time taken to cover the first 40 km = 40 / 80 = 0.5 hours

Given the average speed of for next 40 km = 40km/h

Time taken to cover the next 40 km = Total Distance / average speed

Time taken to cover the next 40 km = 40 / 40 = 1 hours

Now the average speed of the tuck to cover total distance:

Average speed = Total distance / Total time

Average speed = (40 + 40) / (0.5 + 1)

Average speed = 53.33 km/h

8 0

2 years ago

if a sine wave representing ac voltage has an effective value of 70 vac what would be the waves peak value​

if a sine wave representing ac voltage has an effective value of 70 vac what would be the waves peak value