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4 years ago

680 hertz 0.5 meters whats the speed of the sound of the wave

1 answer:

3 0

The velocity of any wave is given by:

$v=f \lambda$

In which $f$ is the wave's frequency (measured in hertz) and $\lambda$ is the wave's wavelength (measured in meters).

So, for this wave:
$v=(680)(.5)=340 \frac{m}{s}$

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Explain how the gravitational potential energy of an object can be changed.

inna [77]

Answer:

Change in Potential energy, pe = Final potential energy - Initial potential energy

Explanation:

∆p.e = Final p.e - Initial p.e

From the equation ∆p.e = (mgh) final - (mgh) initial

4 0

3 years ago

A spring with spring constant k is suspended vertically from a support and a mass m is attached. The mass is held at the point w

garik1379 [7]

Answer:

The oscillation frequency of the spring is 1.66 Hz.

Explanation:

Let m is the mass of the object that is suspended vertically from a support. The potential energy stored in the spring is given by :

$E_s=\dfrac{1}{2}kx^2$

k is the spring constant

x is the distance to the lowest point form the initial position.

When the object reaches the highest point, the stored potential energy stored in the spring gets converted to the potential energy.

$E_P=mgx$

Equating these two energies,

$\dfrac{1}{2}kx^2=mgx$

$\dfrac{k}{m}=\dfrac{2g}{x}$ .............(1)

The expression for the oscillation frequency is given by :

$f=\dfrac{1}{2\pi}\sqrt{\dfrac{k}{m}}$

$f=\dfrac{1}{2\pi}\sqrt{\dfrac{2g}{x}}$ (from equation (1))

$f=\dfrac{1}{2\pi}\sqrt{\dfrac{2\times 9.8}{0.18}}$

f = 1.66 Hz

So, the oscillation frequency of the spring is 1.66 Hz. Hence, this is the required solution.

8 0

4 years ago

Here's an interesting challenge you can give to a friend. Hold a $1 bill by the upper corner. Have a friend prepare to pinch the

grin007 [14]

I would say that it would take her 35 * 2 cashing Bill properly because I multiply 0.25 times 16 which gave me 1.50 + 2.50 equals 3.50

4 0

3 years ago

Read 2 more answers

Please show work and tell me how you did it.

Ilya [14]

Explanation:

1) speed of bicycle = $\frac{distance}{time}$

speed of bicycle= $\frac{20}{2}$

speed of bicycle = 10 miles/hour

2)speed of rocket = $\frac{distance}{time}$

speed of rocket= $\frac{9000}{12.12}$

speed of rocket= 742.57 meter/second

3)speed of jet plane = $\frac{distance}{time}$

speed of jet plane= $\frac{528}{4}$

speed of jet plane= 132 meter/second

4)speed = $\frac{distance}{time}$

time = $\frac{distance}{speed}$

time of trip= $\frac{350}{80}$

time of trip = 4.375 hour

5) Distance = speed × time

Distance = 6 × 3 × 60

Distance = 1080 meter

6) Average speed = $\frac{total distance}{total time}$

Average speed = $\frac{816}{10}$

Average speed = 81.6 km/hour

7) Time = $\frac{Distance}{speed}$

Time = $\frac{450 \times 1000}{120}$

Time = 3750 m/s

4 0

3 years ago

If a driver makes contact with a steering wheel during a 35 mph crash, she comes to rest in about Δ=15 ms. If, during an identic

tatyana61 [14]

Answer:

The ratio of forces is 22 : 3.

Explanation:

Case I:

initial velocity, u = 35 mph

final velocity, v = 0

time, t = 15 ms

Case II:

initial velocity, u = 35 mph

final velocity, v = 0

time, t' = 110 ms

let the mass is m.

According to the Newton's second law, the force is given by the rate of change of momentum.

$F =\frac{m(v-u)}{t}\\\\F'= \frac{m(v-u)}{t'}\\\\So, \frac{F}{F'} =\frac{t'}{t}\\\\\frac{F}{F'}=\frac{110}{15}=22:3$

6 0

3 years ago