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3 years ago

What is the smallest height needed to make a wave?

Physics

2 answers:

GaryK [48]3 years ago

4 0

the answer for this question is 6 feet

tatyana61 [14]3 years ago

4 0

6 feet .................

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A parallel-plate capacitor is charged and then is disconnected from the battery. By what factor does the stored energy change wh

andrew-mc [135]

Answer:

0.5

Explanation:

The energy of a charged capacitor is given by $\frac{1}{2}QC$ where $Q$ is the charge on it and $C$ is its capacitance. The capacitance is defined, geometrically, as

$\dfrac{\epsilon A}{d}$

where $\epsilon$ is a constant that is determined by the material between the plates, $A$ is the area of the plates and $d$ is the distance between them. It is then that the capacitance is linearly inversely proportional to the separation distance; as the distance increases, the capacitance reduces.

Because it is linear, when the separation distance is doubled, other factors remaining constant, the capacitance is halved. Because the capacitance is halved, the energy is halved.

Let's see the mathematics.

Initial capacitance, $C_1$ at initial separation, $d_1$

$C_1=\dfrac{\epsilon A}{d_1}$

If separation is doubled, separation becomes $d_2=2d_1$ . Then the capacitance becomes

$C_2=\dfrac{\epsilon A}{d_2}$

$C_2=\dfrac{\epsilon A}{2d_1}$

$C_2=0.5\dfrac{\epsilon A}{d_1}$

$C_2=0.5C_1$

Initial energy, $E_1=\frac{1}{2}QC_1$

Final energy, $E_2=\frac{1}{2}QC_2= \frac{1}{2}Q\times0.5C_1$

$E_2=0.5\times\frac{1}{2}QC_1=0.5E_1$

Hence, $\frac{E_2}{E_1}=0.5$

5 0

3 years ago

A jogger runs the first 1000 meters of a race in 250 seconds. What is the joggers speed

Andrei [34K]

4 meters per second. hope this helped

7 0

4 years ago

Read 2 more answers

Two moles of neon gas at 25oC and 2.0 atm is expanded to 3 times the original volume while the pressure is reduced to 1.0 atm. F

bazaltina [42]

Answer:

The end temperature is 174 °C

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

So, being:

P= 2 atm
V=?
n= 2 moles
R= 0.082 $\frac{atm*L}{mol*K}$
T= 25 °C= 298 °K

and replacing:

2 atm*V= 2 moles* 0.082 $\frac{atm*L}{mol*K}$ *298 K

you get:

$V=\frac{2 moles* 0.082\frac{atm*L}{mol*K} *298 K}{2 atm}$

V= 24.436 L

Now, two moles of neon gas is expanded to 3 times the original volume while the pressure is reduced to 1.0 atm. Then you know:

P= 1 atm
V= 3*24.436 L=73.308 L

n= 2 moles
R= 0.082 $\frac{atm*L}{mol*K}$
T= ?

Replacing:

1 atm*73.308 L= 2 moles* 0.082 $\frac{atm*L}{mol*K}$ *T

Solving:

$T=\frac{1 atm*73.308 L}{2 moles* 0.082\frac{atm*L}{mol*K}}$

T= 447 °K= 174 °C (being 0°C=273 °K)

<u><em>The end temperature is 174 °C</em></u>

5 0

3 years ago

Examine the scenario.

frutty [35]

I Think The answer is d I hope it helps My friend Message Me if I’m wrong and I’ll change My answer and fix it for you

6 0

3 years ago

Read 2 more answers

Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other. The upp

sashaice [31]

This problem refers to a parallel plate capacitor. There is an electric field between the two plates. The working equation to be used is the Gauss’s Law which is

Electric field = Surface charge density / ε0

The answer is -2.52 μC/m2.

8 0

3 years ago