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3 years ago

What is the speed of a wave if the wavelength is 200 m and the period is 20 s?

Physics

1 answer:

goblinko [34]3 years ago

6 0

Here is your answer

We know that

Velocity = Wavelength/Time period

Here,

Wavelength = 200m

Time period= 20 secs

So,

Velocity= 200/20 m/s

v= 10m/s

HOPE IT IS USEFUL

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Krishna and Seldon now try a homework problem. A policeman sitting in his unmarked police car sees an approaching motorcyclist g

nevsk [136]

Answer:

Explanation:

We shall apply formula of Doppler's effect

Here source is fixed and observer is approaching the source

f = f₀ x [(V + v ) / V ]

f₀ is original and f is apparent frequency , V is velocity of sound and v is velocity of motorcyclist .

f = 1000 x [(331 + 27.27 ) / 331 ]

= 1082 .4 Hz

This is the frequency heard by motorcyclist .

When police car is approaching him when he is stopped

f = f₀ x [V /(V - v ) ]

v is velocity of police car .

= 1000 x 331 / (331 - 27.27)

= 1090 Hz

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4 years ago

A boat on a river travels downstream between 2 points 20 miles apart in 1 hour. It makes its return trip against the current and

Tamiku [17]

There are two unknown quantities that we have to find. In order to work with them, we have to give them temporary names. Lets call the speed of the boat ' B ', and lets call the speed of the current ' C ' .

-- "Downstream", the current is helping the boat. The boat sails past the trees at a speed of (B + C).

(Distance) / (Speed) = Time

(20 miles) / (B + C) = 1 hour

Multiply each side by (B+C), then divide by 1 hr: 20 mi/1 hr = B + C

-- "Upstream" the boat is going against the current. It sails past the trees at a speed of (B - C).

(Distance) / (Speed) = Time

(20 miles) / (B - C) = 2.5 hours

Multiply each side by (B-C), then divide by 2.5 hr: 20 mi/2.5 hr = B - C

We're in good shape now. We have 2 equations in 2 unknowns:

B + C = 20

B - C = 8

Add the two equations, and you get 2B = 28. So B = 14 mph

Subtract the two equations and you get 2C = 12. So C = 6 mph

The speed of the boat is 14 mph .

The speed of the current is 6 mph .

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4 years ago

For segment r and segment l to hold together, they must exert forces on each other. what is the direction of the force exerted o

Inga [223]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The direction of the force exerted on segment r by segment l is left.

The forces on segment R are
1. the force due to L and
2. the pull (to the right) at the right end of the rope.

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3 years ago

Which type of mine involves digging tunnels and shafts deep underground?

mel-nik [20]

The mine involves digging tunnels and shafts deep underground is the underground mining.

<h3>What is mining?</h3>

Mining is the digging of the Earth deep down in search of some precious elements or resources found on Earth.

Underground mining is the digging down into the earth in order to create tunnels. The shafts need to be inserted into those tunnels so that it reaches the deposits of resources.

Thus, underground mining involves digging tunnels and shafts deep underground.

Learn more about mining.

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7 0

2 years ago

The height of a triangle is 4 in. greater than twice its base. The area of the triangle is no more than 168 in.2. Which inequali

olga2289 [7]

The height (h) of a triangle is 4 in. greater than twice its base (x): h = 2x + 4
The area of the triangle is no more than 168 in.2: A ≤ 168 in²

The area of the triangle is A = x*h/2
Hence x*h/2 ≤ 168 in²

Substitute h in the formula for the area:
h = 2x + 4 = 2(x + 2)
x*h/2 ≤ 168 in²

x * 2(x + 2)/2 ≤ 168
x * (x + 2) ≤ 168
x² + 2x ≤ 168
x² + 2x - 168 ≤ 0

Using the formula for quadratic equation:
$x_{1,2} = \frac{-b+/- \sqrt{ b^{2}-4ac } }{2a} = \frac{-2+/- \sqrt{ 2^{2}-4*1*(-168) } }{2*1}= \frac{-2+/- \sqrt{ 4+672 } }{2}= \\ \\ \frac{-2+/- \sqrt{ 676 } }{2}=\frac{-2+/- 26 }{2} \\ \\ 
x_1 = \frac{-2+26}{2} = \frac{24}{2} =12 \\ \\ x_1 = \frac{-2-26}{2} = \frac{-28}{2} =-14
$

6 0

3 years ago

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What is the speed of a wave if the wavelength is 200 m and the period is 20 s?​

What is the speed of a wave if the wavelength is 200 m and the period is 20 s?