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2 years ago

Waves are observed to splash upon the rocks at the shore every 6.0

Physics

1 answer:

Daniel [21]2 years ago

8 0

Explanation:

Given that,

Waves are observed to splash upon the rocks at the shore every 6.0 seconds

The distance measured from crest to adjacent crest is 8.0 m

The distance measured from the lowest to the highest point on the medium is 10.0 m.

We need to find the frequency, wavelength and speed of these waves. We know that the distance measured from crest to adjacent crest is called wavelength of a wave. So, $\lambda=8\ m$

The inverse of time taken by the wave is called its frequency,

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

$f=\dfrac{1}{6\ s}$

f = 0.167 Hz

The speed of a wave is the product of frequency and wavelength. It is given by :

$v=f\times \lambda$

$v=0.167 \times 8$

v = 1.336 m/s

Hence, this is the required solution.

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A wind turbine with a rotor diameter of 40 m produces 90 kW of electrical power when the wind speed is 8 m/s. The density of air

aleksley [76]

Answer:

0.233

Explanation:

Given that

Diameter of rotor, d = 40 m

Power of rotor, P = 90 kW

Speed of the wind, v = 8 m/s

Density of air, p = 1.2 kg/m³

It is a known fact that

KE = ½mv², where mass flow rate, m

m = p.A.v, where Area, A

A = πd²/4

A = (3.142 * 40²)/4

A = 3.142 * 1600/4

A = 3.142 * 400

A = 1256.8 m², substitute for A in the mass flow rate equation

m = p.A.v

m = 1.2 * 1256.8 * 8

m = 12065.28, substitute for m in the KE equation

KE = ½mv²

KE = ½ * 12065.28 * 8²

KE = 12065.28 * 32

KE = 386088.96 W or

KE = 386.1 kW

Fraction of kinetic energy converted to electric energy is

Fraction = Electric Power / Total KE

Fraction = 90 / 386.1

Fraction = 0.233

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2 years ago

Suppose the door of a room makes an airtight but frictionless fit in its frame. Do you think you could open the door if the air

Amiraneli [1.4K]

Answer:

Yes, it could be opened

Explanation:

Pressure is force per unit area

$P =\frac{F}{A}$

Since there is a difference in air pressure on both sides, this difference when multiplied by the area of the floor will create a force which could open the door, if this force is complimented with a greater applied force.

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2 years ago

Saturn has an orbital period of 29.46 years. In two or more complete sentences, explain how to calculate the average distance fr

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For astronomical objects, the time period can be calculated using:
T² = (4π²a³)/GM
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2 years ago

The cockroach Periplaneta americana can detect a static electric field of magnitude 8.50 kN/C using their long antennae. If the

otez555 [7]

Answer:

0.647 nC

Explanation:

The force experienced by a charge due to the presence of an electric field is given by

$F=qE$