All categories

4 years ago

What is the speed of a wave that has a frequency of 200 Hz and a

Physics

1 answer:

Luba_88 [7]4 years ago

8 0

The wave speed to this question is 400 meters

You might be interested in

A runner makes one lap around a 200m track of a time of 25s . What were the runner's (a) average speed

Nady [450]

The runner runs 8 meters per second or 28.8 kilometers per hour

8 0

4 years ago

A red blood cell contains 4.8 107 free electrons. What is the total charge of these electrons in the red blood cell?

tatuchka [14]

Answer:

Charge, $q=7.68\times 10^{-12}\ C$

Explanation:

It is given that,

The number of electron in a RBCs, $n=4.8\times 10^7$

We need to find the total charge of these electrons in the red blood cell. Let it is q. Using the quantization of charge as follows :

q = ne

e is the change on electron

$q=4.8\times 10^7\times 1.6\times 10^{-19}\\\\q=7.68\times 10^{-12}\ C$

So, the net charge is $7.68\times 10^{-12}\ C$ .

7 0

3 years ago

Draw a rectangular fraction model to find the sum. Simplify your answer, if possible

ddd [48]

Can you show exactly what do you want ?

3 0

4 years ago

Two ice skaters hold hands and rotate, making one revolution in 2.87 s. Their masses are 59.0 kg and 73.0 kg, and they are separ

pychu [463]

Answer:

86.43

25.72

Explanation:

Location of center of mass from 59 Kg

$r_1=\frac {xm_2}{m1+m2}=\frac {1.1*73}{59+73}= 0.608333m$

Location of center of mass from 73 Kg

$r_2=\frac {xm_1}{m1+m2}=\ frac {1.1*59}{59+73}= 0.491667m$

Momentum of inertia

$I=m1r_1^{2}+m2r_2^{2}=59*0.608333^{2}+73*0.491667^{2}=21.8341 +17.64674=39.48083 Kgm^{2}$

Angular moment

$L=I\omega=I(\frac {2\pi}{T})=39.48083(\frac {2*\pi}{2.87 s})=86.43393Js$

(b)

When separation is 0.6 m

Location of centre of mass from 59 Kg

$r_1=\frac {xm_2}{m1+m2}=\frac {0.6*73}{59+73}= 0.331818 m$

Location of centre of mass from 73 Kg

$r_2=\frac {xm_1}{m1+m2}=\ frac {0.6*59}{59+73}= 0.268182 m$

Momentum of intertia

$I=m1r_1^{2}+m2r_2^{2}=59*0.331818^{2}+73*0.268182^{2}=6.496095 + 5.250269=11.74636 Kgm^{2}$

Angular moment

$L=I\omega=I(\frac {2\pi}{T})=11.74636(\frac {2*\pi}{2.87 s})=25.71588 Js$

7 0

3 years ago

A scientist is studying a sample of water and a sample of an unknown liquid. Both samples have the same mass. The scientist had

MrRa [10]

The unknown liquid has a lower specific heat than water.

7 0

4 years ago