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3 years ago

Under the doppler effect, if the source of a wave is moving, it must be changing the frequency of the wave. true false

Physics

1 answer:

Ede4ka [16]3 years ago

4 0

True, a source coming towards you has an increased frequency, a source moving away from you has a reduced frequency.

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How is speed represented on a speedometer ? how is acceleration represented?

Marianna [84]

Speed is scalar quantity that is defined only by its magnitude and is represented with one value.
Velocity on the other side is a vector quantity that is defined with its magnitude and direction. The speedometer measures and displays the speed of the vehicle.
Where the needle points on the speedometer that is the speed of the vehicle.
The velocity is not explicitly shown, but if f the needle is moving, you can get a rough idea of acceleration. If the needle is going clockwise the vehicle is accelerating.

8 0

4 years ago

a student stands several meters in front of a smooth reflecting wall, holding a board on which a wire is fixed at each end. the

Andrew [12]

Answer:

Explanation:

From the question we are told that

The length of the wire is $L = 75.0cm = \frac{75}{100} = 0.75 \ m$

The mass of the wire is $m = 2.25 \ g = \frac{2.25}{1000} = 0.00225 \ kg$

The tension is $T = 400 \ N$

The frequency of the beat heard by the second student is

$f_b = 8.30\ beat/second$

The speed of the wave generated by the vibration of the wire is mathematically represented as

$v = \sqrt{\frac{TL}{m}}$

substituting values

$v = \sqrt{\frac{400 *0.75}{0.00225}}$

$v = 365.15 m/s$

The wire is vibrating in its third harmonics so the wavelength is

$\lambda = \frac{2L}{3}$

substituting values

$\lambda = \frac{2*0.75}{3}$

$\lambda = 0.5 \ m$

The frequency of this vibration is mathematically represented as

$f = \frac{v}{\lambda }$

substituting values

$f = \frac{365.15}{0.5 }$

$f = 730.3 Hz$

The speed of the second student (Observer) is mathematically represented as

$v_o = [\frac{f_b}{2f} ] * v$

substituting values

$v_o = [\frac{8.30}{2* 730.3} ] * 365.15$

$v_o = 2.08 \ m/s$

8 0

3 years ago

Particles q1, 92, and q3 are in a straight line.

frutty [35]

Answer:

-1.35 N

Explanation:

Force due to q1

F = 9 × 10⁹ × 5 × 10⁻⁶ × 2.5 × 10⁻⁶ / 0.5²
F = 450 × 10⁻³
F = 0.45 N (+)

Force due to q2

F = 9 × 10⁹ × 5 × 10⁻⁶ × 2.5 × 10⁻⁶ / 0.25²
F = 1800 × 10⁻³
F = 1.8 N (-)

Net Force

0.45 - 1.8
-1.35 N

7 0

2 years ago

Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical chan

Anastaziya [24]

Explanation:

Steam evaporates as a gas into the air. even when you capture steam as it rises into the atmosphere, it can be turned back into h2o when cooled. because of evaporation, you will not get the same volume of water you started with.

8 0

3 years ago

Read 2 more answers

A plumber applies a torque of 408 to a bolt using a wrench. If he moves his hand twice as far

laiz [17]

Answer:

816

Explanation:

We must remember that torque is defined as the product of a force by a distance.

This distance is measured from the pivot point of the Bolt to the point where the force is applied. in this way, we have the following equation to be able to determine the torque.

$T=F*d$

Now if we double the turning distance we have the torque should also be double.

$T =F*2*d$

7 0

3 years ago