If two runners take the same amount of time to run a mile, they have the same _________

A sound wave of frequency 440 Hz is played by a musician. What is the

TiliK225 [7]

Answer:

343/440

Explanation:

Recall that v=d/t

Now, this is the same thing.

Frequency is 1/T and wavelength is the distance travelled in one period.

So Vs=f*λ

(the greek letter is used as the symbol of wavelength; it's arbitrary)

7 0

3 years ago

Why does the Moon not have an atmosphere?

Elena-2011 [213]

Answer: Moon is much smaller in size and has very less mass, when compared to our mighty earth and there is absence of strong magnetic field on the moon which could protect from the incoming solar radiation from the sun. Since there is no magnetic field, it can swipe off any materials that are present there on the moon, diminishing the atmosphere.

This is the reason why moon does not have any atmosphere.

6 0

4 years ago

(A) What is the maximum tension possible in a 1.00-millimeter-diameter nylon tennis racket string?

attashe74 [19]

Complete Question

(A) What is the maximum tension possible in a 1.00- millimeter-diameter nylon tennis racket string?

(B) If you want tighter strings, what do you do to prevent breakage: use thinner or thicker strings? Why? What causes strings to break when they are hit by the ball?

The tensile strength of the nylon string is $600*10^{6} \ N/m^2$

Answer:

A

T = 471.3 \ N

B

To prevent breakage the thickness of the string is increased

String breakage when the racket hit the ball is as a result of the string not being thick enough to withstand the increase in tension

Explanation:

From the question we are told that

The diameter is $d = 1.00 \ mm = 0.001 \ m$

The tensile strength of the nylon string is $\sigma = 600 *10^{6} \ N/m^2$

Generally the radius is mathematically evaluated as

$r= \frac{d}{2}$

=> $r = \frac{0.001}{2}$

=> $r = 0.0005 \ m$

The cross sectional area is mathematically represented as

$A = \pi r^2$

=> $A = 3.142 * (0.005)^2$

=> $A = 7.855*10^{-7}\ m^2$

Generally the tensile strength of nylon is mathematically represented as

$\sigma = \frac{T}{ A }$

Where T is the tension on the maximum tension on the string

So

$T = \sigma * A$

=> $T = 600*10^{6} * 7.855*10^{-7}$

=> $T = 471.3 \ N$

Form the equation above we see that

$T \ \alpha \ A$

So if the tension is increased to prevent breakage the thickness of the string is increased(i. e the cross-sectional area )

String breakage when the racket hit the ball is as a result of the string not being thick enough to withstand the increase in tension

8 0

4 years ago

Poverty and backwardness are also considered as the cause of rapid population growth. Why????

alexandr402 [8]

because poor and people of back places may not have enough knowledge about contraceptive devices and may not have enough money to buy it.That's why poverty and backwardness are considered to be a cause of population growth

6 0

3 years ago

Change in v= 9.8 m/s2xt. The diagram shows a ball falling toward Earth in<br> a vacuum.

Tresset [83]

Answer:

Option A. 39.2 m/s

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 0 m/s

Acceleration due to gravity (g) = 9.8 m/s²

Time (t) = 4 s

Final velocity (v) =?

v = u + gt

Since the initial velocity (u) is 0, the above equation becomes:

v = gt

Thus, inputting the value of g and t, we can obtain the value of v as shown below:

v = 9.8 × 4

v = 39.2 m/s

Therefore, the velocity of the ball at 4 s is 39.2 m/s.

5 0

3 years ago

Read 2 more answers

If two runners take the same amount of time to run a mile, they have the same __________.