I don't understand this question whoever helps thank you!

A wave travels at 295 m/s and has a wavelength of 2.50 m. What is the frequency of the wave?

posledela

Answer:

$118\; \rm Hz$ .

Explanation:

The frequency $f$ of a wave is equal to the number of wave cycles that go through a point on its path in unit time (where "unit time" is typically equal to one second.)

The wave in this question travels at a speed of $v= 295\; \rm m\cdot s^{-1}$ . In other words, the wave would have traveled $295\; \rm m$ in each second. Consider a point on the path of this wave. If a peak was initially at that point, in one second that peak would be

How many wave cycles can fit into that $295\; \rm m$ ? The wavelength of this wave $\lambda = 2.50\; \rm m$ gives the length of one wave cycle. Therefore:

$\displaystyle \frac{295\;\rm m}{2.50\; \rm m} = 118$ .

That is: there are $118$ wave cycles in $295\; \rm m$ of this wave.

On the other hand, Because that $295\; \rm m$ of this wave goes through that point in each second, that $118$ wave cycles will go through that point in the same amount of time. Hence, the frequency of this wave would be

Because one wave cycle per second is equivalent to one Hertz, the frequency of this wave can be written as:

$f = 118\; \rm s^{-1} = 118\; \rm Hz$ .

The calculations above can be expressed with the formula:

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

where

$v$ represents the speed of this wave, and
$\lambda$ represents the wavelength of this wave.

6 0

3 years ago

A type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. What f

babymother [125]

Answer:

the force constant k = 2.369 N/m

Explanation:

Given that:

A type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair.

with period T = 0.500 s and a mass of 0.0150 kg, Then the force constant can be calculated by using the formula:

$\mathtt{T = 2 \pi \ \sqrt{\dfrac{m}{k} }}$

where;

T = time period

m = mass

k = force constant.

By making k the subject of the formula; we have:

$\mathtt{T^2 = 4 \pi^2 (\dfrac{m}{k})}$

$\mathtt{k =\dfrac{4 \pi ^2 \ m}{T^2}}$

replacing our given values , we have:

$\mathtt{k =\dfrac{4 (3.142) ^2 \ \times 0.0150 }{0.5^2}}$

$\mathtt{k =\dfrac{39.49 \ \times 0.0150 }{0.25}}$

$\mathtt{k =\dfrac{0.59235 }{0.25}}$

k = 2.369 N/m

7 0

3 years ago

Three identical train cars, coupled together, are rolling east at speed v0. A fourth car traveling east at 2v0 catches up with t

Bezzdna [24]

Answer:

$1v_0$

Explanation:

Assuming that cars 4 and 5 have same mass so that the momentum

P=mv where m is mass and v is velocity hence

Momentum=0+2mv+3mv=5mv

The final mass is 2m+3m=5m

From aw of conservation of momentum

$5mv_0=5mv$ hence $v=1v_o$

Therefore, the speed is $1v_0$

7 0

3 years ago

Which of the following tools should a scientist use to measure an object in milligrams? a.Electronic balance b.Pan balance .c.Ta

QveST [7]

Answer:

c. Tape measure.

Explanation:

Here in this case we have to measure the length of the object ( distance) so we need to use tape measure.

Tape measure is a device used to measure small distances. It consists of ribbon of clothes, plastic , fiber. glass or metal strip with linear measurement markings. rest all options do not measure length.

7 0

3 years ago

Read 2 more answers

Find the electric flux passing through the 45° surface of an upright circular cone with a base diameter of 4 m if the electric f

alexgriva [62]

Answer:

electric flux = 177.625 N-m²/C

Explanation:

given data

angle = 45°

diameter = 4 m

electric field E = 20 N/C

to find out

electric flux

solution

we know electric flux formula that is

electric flux = E × A × cosθ ..............1

here A is area that is

Area = πd²/4 = π(4)²/4 = 12.56 m²

now put all value in equation 1

electric flux = 20 × 12.56 × cos45

electric flux = 177.625 N-m²/C

8 0

3 years ago