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3 years ago

Which statement describes what some people might consider a benefit of wireless technology?

Physics

2 answers:

dangina [55]3 years ago

8 0

Answer:

Uhhh

Explanation:

I dont know

Debora [2.8K]3 years ago

6 0

Micah interacts with people.

All the others are not benefits but negative effects or consequences.

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If a pendulum has a period of 2.4 seconds what is the frequency?

REY [17]

We can use the equation $Peroid = \frac{1}{Frequency}$ to calculate the frequency.
Rearranging this gives us $Frequency = \frac{1}{Period}$ .
So the frequency is $\frac{1}{2.4}$ , which equals 0.42 hertz
(to 2 decimal places).

4 0

3 years ago

How much heat is absorbed by 41 g iron skillet when its temperature varies from 9°C. to 20°C

alexgriva [62]

Answer:

202.95J

Explanation:

The formulae for the energy absorbed by the iron skillet is;

q=m*c*ΔФ where q=energy absorbed, m is mass of iron skillet, c is specific heat capacity and ΔФ is change in temperature

Given that;

m= 41g

ΔФ=20°-9°=11°

c=0.45 J/g°C

q= 41×0.45×11

q= 202.95 J

4 0

3 years ago

Two positive charges of magnitude 20 micro C and 100 micro C are placed at a distance of 150cm. Calculate the force of repulsion

Luba_88 [7]

$first \: positive \: charge = q1 = 20$

$1micro \: = {1}^{ - 6}$

$1q = 20 \times 10 {}^{ - 6}$

$second \: charge = q2 = 100 \times 10 {}^{ - 6}$

$formula = f = \frac{k \times q1 × q2}{d {}^{2} }$

remember

$k = 9 \times {10}^{9}$

change distance 150cm to 1.5m

putting values

f = $\frac{9 \times 10 {}^{9} \times 20 \times 10 {}^{ - 6} \times 100 \times {10}^{ - 6} }{1.5 {}^{2} }$

<h2 /><h3>answer </h3><h3><u>8</u><u>N</u></h3>

4 0

3 years ago

A child is sitting in a sled at the top of a snowy hill. Which statement is true regarding the position of the child?

sergejj [24]

Answer:

Explanation:

5 0

3 years ago

The equation that describes a transverse wave on a string is y = (0.0120 m)sin[(927 rad/s)t - (3.00 rad/m)x] where y is the disp

dem82 [27]

Answer:

Speed, v = 312.34 m/s

Explanation:

The equation that describes a transverse wave on the string is given by :

$y=0.0120\ msin[(927\ rad/s)t-(3\ rad/m)x]$ ..............(1)

Where

y = displacement of a string particle

x = position of the particle on the string

The wave is travelling in the +x direction. We have to find the speed of the wave.

The general equation of traverse wave is given by :

$y=A\ sin(kx-\omega t)$ ................(2)

On comparing equation (1) and (2) we get,

k = 3 rad/m

Since, $k=\dfrac{2\pi}{\lambda}$

$\lambda=\dfrac{2\pi}{3}$ ..............(3)

Also, $\omega=927\ rad/s$

Since, $\omega=2\pi \nu$

$\nu=\dfrac{927}{2\pi}$ ...............(4)

Speed of the wave is the product of frequency and wavelength i.e.

$v=\nu\times \lambda$

Using equation (3) and (4), the speed of the wave can be calculated as :

$v=\dfrac{927}{2\pi}\times \dfrac{2\pi}{3}$

v = 312.34 m/s

Hence, the speed of the transverse wave is 312.34 m/s

5 0

3 years ago