Ask question

Ask question

All categories

3 years ago

13

What are some evidences of early peoples concern for teeth

1 answer:

Alexandra [31]3 years ago

7 0

Replacement teeth were made even back then out of primitive materials, and pig hair was used like floss

You might be interested in

Determine the frequency of light whose wavelength is 4.257 x 10-7 cm

marin [14]

$v = f (wavelength)$ i don't know what symbol ya'll use for wavelength so i just put the word instead.We use the greek symbol lambda.So just plug in everything you know.
wavelength=4.257×10^-7x10^-2 and
v=speed of light = 3×10^8
So you should get f= 7.04 ×10^15Hz

7 0

2 years ago

The combined electrical resistance R of two resistors R_1 and R_2, connected in parallel, is given by 1/R = 1/R_1 + 1/R_2 where

Orlov [11]

Answer:

$0.6\Omega/s$

Explanation:

We are given that

$R_1=150\Omega$

$R_2=75\Omega$

$\frac{dR_1}{dt}=1\Omega/s$

$\frac{dR_2}{dt}=1.5\Omega/s$

We have to find the rate at which R is changing.

In parallel

$\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}$

Using the formula

$\frac{1}{R}=\frac{1}{50}+\frac{1}{75}=\frac{3+2}{150}=\frac{5}{150}=\frac{1}{30}$

$R=30\Omega$

$-\frac{1}{R^2}\frac{dR}{dt}=-\frac{1}{R^2_1}\frac{dR_1}{dt}-\frac{1}{R^2_2}\frac{dR_2}{dt}$

$\frac{1}{R^2}\frac{dR}{dt}=\frac{1}{R^2_1}\frac{dR_1}{dt}+\frac{1}{R^2_2}\frac{dR_2}{dt}$

Substitute the values

$\frac{1}{900}\frac{dR}{dt}=1\times\frac{1}{2500}+1.5\times\frac{1}{(75)^2}$

$\frac{dR}{dt}=900(\frac{1}{2500}+\frac{1.5}{5625}$

$\frac{dR}{dt}=0.6\Omega/s$

7 0

3 years ago

the volume of ice block is 2400cm^3 and its density is 0.9 g/cm^3. how much part of it remains above the surface of water when i

stiks02 [169]

Answer:

240 cm³

Explanation:

Weight = Buoyancy

mg = ρVg

m = ρV

(0.9 g/cm³ × 2400 cm³) = (1 g/cm³) V

V = 2160 cm³

The submerged volume is 2160 cm³, so the volume above the surface is 240 cm³.

4 0

2 years ago

Mechanics is the study of

svetoff [14.1K]

Mechanics is the study of motion and force on physical objects and their surroundings

4 0

2 years ago

Please help, I am stumped.

ehidna [41]

30 is the correct answer your looking for

6 0

3 years ago

Read 2 more answers