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4 years ago

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Two wires, each of length 1.2m are stretched between 2 fixed supports. On wire A there is a second harmonic standing wave whose

frequency is 660 Hz. However, the same frequency, 660 Hz, is the third harmonic for wire B. Find the speed at which the waves travel on each wire.

1 answer:

emmainna [20.7K]4 years ago

4 0

Explanation:

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2H2+O2---> 2H2O can be classified as what type of reaction?

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I believe the answer is B

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4 years ago

What is the role of pressure and dissolved gases in eruptions?.

Katarina [22]

Answer:

Explanation:

Magma contains dissolved gases, which provide the driving force that causes most volcanic eruptions. As magma rises towards the surface and pressure decreases, gases are released from the liquid portion of the magma (melt) and continue to travel upward, and are eventually released into the atmosphere.

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2 years ago

A total Δν of 15 km/s is required to achieve an interplanetary mission. The proposed rocket has two stages. The first stage alon

AlexFokin [52]

Answer:

102000 kg

Explanation:

Given:

A total Δν = 15 km/s

first stage mass = 1000 tonnes

specific impulse of liquid rocket = 300 s

Mass flow rate of liquid fuel = 1500 kg/s

specific impulse of solid fuel = 250 s

Mass flow of solid fuel = 200 kg/s

First stage burn time = 1 minute = 1 × 60 seconds = 60 seconds

Now,

Mass flow of liquid fuel in 1 minute = Mass flow rate × Burn time

or

Mass flow of liquid fuel in 1 minute = 1500 × 60 = 90000 kg

Also,

Mass flow of solid fuel in 1 minute = Mass flow rate × Burn time

or

Mass flow of solid fuel in 1 minute = 200 × 60 = 12000 kg

Therefore,

The total jettisoned mass flow of the fuel in first stage

= 90000 kg + 12000 kg

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3 years ago

What sort evidence must be gathered to support the idea that all living things are composed of cells

scZoUnD [109]

<u>Answer:</u>

To support the idea that all living things are composed of cells samples of many kinds of living things should be examined under a microscope to identify the presence of cells.

<u>Explanation:</u>

Cell theory states that all living beings are composed of cells. To prove this a thorough examination of a number of living beings under a powerful microscope is needed. Parts of all living things when observed under the microscope are found to be made up of smaller units called cells.

This examination helps to identify differences between plant cells and animal cells. It also gives an idea of the existence of unicellular organisms.

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4 years ago

Read 2 more answers

At some instant and location, the electric field associated with an electromagnetic wave in vacuum has the strength 57.5 V/m. Fi

n200080 [17]

Answer:

$1.9167\times 10^{-7}\ T$

$2.9247498849\times 10^{-8}\ J/m^3$

$8.7742496547\ W/m^2$

Explanation:

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

$\mu_0$ = Vacuum permeability = $4\pi \times 10^{-7}\ H/m$

E = Electric field = 57.5 V/m

c = Speed of light = $3\times 10^8\ m/s$

Magnetic field is given by

$B=\dfrac{E}{c}\\\Rightarrow B=\dfrac{57.5}{3\times 10^8}\\\Rightarrow B=1.9167\times 10^{-7}\ T$

The magnetic field strength is $1.9167\times 10^{-7}\ T$

Energy density is given by

$u=\dfrac{1}{2}\epsilon_0E^2+\dfrac{1}{2\mu_0}B^2\\\Rightarrow u=\dfrac{1}{2}\times 8.85\times 10^{-12}\times 57.5^2+\dfrac{1}{2\times 4\pi \times 10^{-7}}(1.9167\times 10^{-7})^2\\\Rightarrow u=2.9247498849\times 10^{-8}\ J/m^3$

The energy density is $2.9247498849\times 10^{-8}\ J/m^3$

Power flow per unit area is given by

$\dfrac{P}{A}=uc\\\Rightarrow \dfrac{P}{A}=2.9247498849\times 10^{-8}\times 3\times 10^8\\\Rightarrow \dfrac{P}{A}=8.7742496547\ W/m^2$

Power flow per unit area is $8.7742496547\ W/m^2$

7 0

3 years ago