Answer:
497.00977 N
3742514.97005
Explanation:
= Density of water = 1000 kg/m³
C = Drag coefficient = 0.09
v = Velocity of dolphin = 7.5 m/s
r = Radius of bottlenose dolphin = 0.5/2 = 0.25 m
A = Area
Drag force
![F_d=\frac{1}{2}\rho CAv^2\\\Rightarrow F_d=\frac{1}{2}\times 1000 \times 0.09(\pi 0.25^2)7.5^2\\\Rightarrow F_d=497.00977\ N](https://tex.z-dn.net/?f=F_d%3D%5Cfrac%7B1%7D%7B2%7D%5Crho%20CAv%5E2%5C%5C%5CRightarrow%20F_d%3D%5Cfrac%7B1%7D%7B2%7D%5Ctimes%201000%20%5Ctimes%200.09%28%5Cpi%200.25%5E2%297.5%5E2%5C%5C%5CRightarrow%20F_d%3D497.00977%5C%20N)
The drag force on the dolphin's nose is 497.00977 N
at 20°C
= Dynamic viscosity = ![1.002\times 10^{-3}\ Pas](https://tex.z-dn.net/?f=1.002%5Ctimes%2010%5E%7B-3%7D%5C%20Pas)
Reynold's Number
![Re=\frac{\rho vd}{\mu}\\\Rightarrow Re=\frac{1000\times 7.5\times 0.5}{1.002\times 10^{-3}}\\\Rightarrow Re=3742514.97005](https://tex.z-dn.net/?f=Re%3D%5Cfrac%7B%5Crho%20vd%7D%7B%5Cmu%7D%5C%5C%5CRightarrow%20Re%3D%5Cfrac%7B1000%5Ctimes%207.5%5Ctimes%200.5%7D%7B1.002%5Ctimes%2010%5E%7B-3%7D%7D%5C%5C%5CRightarrow%20Re%3D3742514.97005)
The Reynolds number is 3742514.97005
- The potential difference between two locations in an electric circuit is measured using a voltmeter.
- If the electricity passes through the voltmeter it shows deflection.
<h3>What is the purpose of a voltmeter?</h3>
- A voltage meter, usually referred to as a voltmeter, is a device that measures the voltage, or potential difference, between two points in an electrical or electronic circuit.
- volts is the unit of voltmeter(volts, millivolts, kilovolts)
<h3>What is the explanation for the link between current and voltage?</h3>
- Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.
<h3>What is ohm's law in circuit?</h3>
- V = IR, where V is voltage, I is current, and R is resistance, is known as Ohm's Law.
- If you know the voltage of the battery in the circuit and how much resistance is in the circuit, you may use Ohm's Law to identify properties of a circuit, such as how much current is flowing through it.
To learn more about current and voltage visit:
brainly.com/question/10254698
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Venus has a dense atmosphere of mostly carbon dioxide. <em>(D)</em>
A, B, and C are false statements.
<span>The magnitude of the rock is equal to g. After the rock is released, there are no more forces acting on it, yet gravity remains. The initial inputs, on a bridge, at an angle of 30 deg below horizontal do not matter after the release.</span>
In order to calculate the angle, we can use the formula below for a constructive interference (the interference is constructive because the fringe is bright):
![d\sin\theta=m\lambda](https://tex.z-dn.net/?f=d%5Csin%5Ctheta%3Dm%5Clambda)
Where d is the distance between the slits, m is the order of the interference and lambda is the wavelength.
So, using d = 8.25 * 10^-5, m = 2 and lambda = 4.5 * 10^-7, we have:
![\begin{gathered} 8.25\cdot10^{-5}\cdot\sin\theta=2\cdot4.5\cdot10^{-7}\\ \\ \sin\theta=\frac{9\cdot10^{-7}}{8.25\cdot10^{-5}}\\ \\ \sin\theta=1.091\cdot10^{-2}\\ \\ \theta=0.625° \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%208.25%5Ccdot10%5E%7B-5%7D%5Ccdot%5Csin%5Ctheta%3D2%5Ccdot4.5%5Ccdot10%5E%7B-7%7D%5C%5C%20%5C%5C%20%5Csin%5Ctheta%3D%5Cfrac%7B9%5Ccdot10%5E%7B-7%7D%7D%7B8.25%5Ccdot10%5E%7B-5%7D%7D%5C%5C%20%5C%5C%20%5Csin%5Ctheta%3D1.091%5Ccdot10%5E%7B-2%7D%5C%5C%20%5C%5C%20%5Ctheta%3D0.625%C2%B0%20%5Cend%7Bgathered%7D)
Therefore the correct option is the second one.