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anyanavicka [17]

3 years ago

14

4: A piece of fur is negatively charged when:

1 answer:

MatroZZZ [7]3 years ago

5 0

Answer:

the fur is unexpected

Explanation:

idk

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When sunlight strikes the side of a building, what form of energy is it<br> transformed to?

algol [13]

Answer:

thermal energy

Explanation:

8 0

3 years ago

3. Infiltration is the process by which rainwater becomes

amid [387]

<em></em>Your answer is :<em>

A.
</em>
Groundwater.<em>

</em>

4 0

4 years ago

The motion of spinning a hula hoop around one's hips can be modeled as a hoop rotating around an axis not through the center, bu

Citrus2011 [14]

Answer and Explanation:

Based on the given information, the formula and the computation is given below:

a. The rotational inertia of the hoop is shown below:

$I_H = I_R + Mh^2$

$= MR^2 + Mh^2$

$= 0.73 \times (0.60^2 + 0.38^2)$

= 0.73 × (0.36 + 0.1444)

= 0.368 $kg\ mg^2$

b. Now the rotational kinetic energy is

$= Half \times Inertia \times omega^2$

$= 0.5 \times 0.368 \times 14.1^2$

= 36.58 J

We simply applied the above formula for rotational inertia and rotational kinetic energy in order to reach with the correct answer

6 0

3 years ago

A 15.0 m \long copper wire, 2.20 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils t

Hoochie [10]

a) 0.5 m

b) $4.77\cdot 10^{-3} T$

Explanation:

a)

At the beginning, the length of the copper wire is:

L = 15.0 m

and the diameter (so, the thickness of each adjacent circle) is

$t=2.20 mm = 0.0022 m$

While the diameter of one circle of the solenoid is

$d=2.10 cm = 0.021 m$

So the perimeter of one circle is

$p=\pi d=\pi (0.021)=0.0659 m$

So the number of complete circles in the solenoid is

$n=\frac{L}{p}=\frac{15.0}{0.0659}=227.6$

The tickness of one circle is $t$ , so the total length of the solenoid will be:

$L'=nt=(227.6)(0.0022)=0.5 m$

b)

The magnetic field at the center of a solenoid is given by

$B=\mu_0 n I$

where

$\mu_0$ is the vacuum permeability

n is the number of turns of the solenoid

I is the current in the solenoid

Here we have:

$\mu_0 =4\pi \cdot 10^{-7}H/m$ is the vacuum permeability

$n=227.6$ is the number of turns in the solenoid (calculated in part a)

I = 16.7 A is the current in the solenoid

Substituting, we find:

$B=(4\pi \cdot 10^{-7})(227.6)(16.7)=4.77\cdot 10^{-3} T$

5 0

3 years ago

You hear a sound with a frequency of 256 Hz. The amplitude of the sound increases and decreases periodically: It takes 2 seconds

Fiesta28 [93]

These 255.75 Hz and 256.25 Hz sounds can be thought of as a sum of two waves with frequencies.

Answer: Option A

<u>Explanation:</u>

To solve this, it is necessary to take into account the concepts related to frequency and period, and how they are related to each other.

Let frequency of beat = f

The relationship that defines both agreements is given by the equation,

$f=\frac{1}{T}$

Then the frequency for the previous period given (2sec) is

$f=\frac{1}{2}=0.5$

The beat frequency of two frequencies is equal to the difference between the two frequencies, then

$f=\left|f_{1}-f_{2}\right|$

$f=|255.75-256.25|=0.5 H z$

Hence, Option A is correct.

Similarly we can check like these for other options too as below,

For option B, $f=|255.5-256.5|=1 Hz$ .

For Option C, $f=|255-257|=2 H z$

For Option D, $f=|254-258|=4 H z$

For Option E, $f=|256-2|=254 H z$

Therefore, the sum of the frequencies in the sound wave would be 256.25Hz and 255.75Hz.

8 0

3 years ago