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3 years ago

Why are earbud wires for an mp3 player coated with plastic

Physics

2 answers:

andriy [413]3 years ago

7 0

The naked wires are dangerous, so the plastic coating insulates and protects the wires :)

saw5 [17]3 years ago

6 0

2) they add the insulation to better the durability or the earbuds

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Preston tossed a red ball upward and it reaches a maximum height of 3.0. What is the final velocity when it returns to prestons

Leokris [45]

That will depend on the units of the 3.0. We need to know if it's 3 feet, 3 yards, 3 meters, or 3 miles. Each one will have a different answer.

5 0

3 years ago

A stone is thrown vertically upward with a speed of 20.0 m/s. (a) How fast is it moving when it reaches 12.0 m? (b) How long is

kaheart [24]

(a) How fast is it moving when it reaches 12.0 m?
To determine the velocity as it reaches 12.0 m, we use one of the kinematic equations,
V^2 = Vo^2 + 2gh
where Vo = 20 m/s. 
 g = -9.8 m/s^2 
 h = 12.0 m. 
V^2 = 20^2 + 2(-9.8)(12.0)
V^2 = 164.8
V = 12.84 m/s

(b) How long is required to reach this height?
To determine the maximum height, we use the same equation we used above,
V^2 = Vo^2 + 2gh
where Vo = 20 m/s.
g = -9.8 m/s^2
V = 0 (since at the maximum height velocity is zero)
0^2 = 20^2 + 2(-9.8)h
h = 20.41 m

(c) Why are there two answers for (b)?
There are two answers for b because it would travel a distance up and travel a distance down.

5 0

3 years ago

Read 2 more answers

How much energy (in kj) do 3.0 moles of photons, all with a wavelength of 670 nm, contain? how much energy (in kj) do 3.0 moles

Kisachek [45]

1 mole of photons contain $6.023 \cdot 10^{23}$ photons (Avogadro number). This means that 3.0 moles of photons contain
$N=3\cdot 6.023 \cdot 10^{23} =1.81 \cdot 10^{24}$ photons.

The wavelength of the light in the problem is $\lambda=670 nm=670\cdot 10^{-9}m$ , so the frequency is
$f= \frac{c}{\lambda}= \frac{3\cdot 10^8 m/s}{670 \cdot 10^{-9}m}=4.48 \cdot 10^{14}Hz$

The energy carried by a single photon is
$E=hf$
where $h=6.62 \cdot 10^{-34}Js$ is the Planck constant, while f is the frequency. Since this is the energy carried by a single photon, the energy carried by 3.0 moles of photons will be the energy of the single photon multiplied by the total number of photons:
$E=Nhf=(1.81 \cdot 10^{24})(6.62 \cdot 10^{-34}Js)(4.48 \cdot 10^{14}Hz )=5.36 \cdot 10^5 J$
which corresponds to E=536 kJ.

4 0

3 years ago

A crazy dog runs at a constant speed of 19.85 mi/hr for 6.09 min. How far does the dog travel during this time period?

Phantasy [73]

Answer:

Distance, d = 3242.19 meters

Explanation:

It is given that,

Speed of the dog, v = 19.85 mi/hr

Since, 1 mph = 0.44704 m/s

v = 19.85 mi/hr = 8.873 m/s

Time taken by the dog, t = 6.09 min = 365.4 sec

Let the distance covered by the dog during this time period is d. It can be calculated by the speed of the dog multiplied by the time taken as :

$d=v\times t$

$d=8.873\times 365.4$

d = 3242.19 meters

So, the the dog travel during this time period is 3242.19 meters. Hence, this is the required solution.

8 0

3 years ago

Determination of the energy imparted to matter by radiation is the subject of ______. A. photometry B. magnification C. dosimetr

givi [52]

Answer:

dosimetry

Explanation:

dosimetry is the determination of energy imparted to matter by radiation

7 0

3 years ago