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4 years ago

How does the epidermis protect our skin

Physics

2 answers:

Darina [25.2K]4 years ago

8 0

From harmful radiation from our sun!!!!!

Ilya [14]4 years ago

6 0

The epidermis is the outermost epithelial layer over the skin. This is what you see and touch. It is made up mostly of keratinocytes.

Clearly this layer protects the layers beneath, i.e., the dermis and the subcutaneous layer which both have more delicate functions. It keeps out dirt, debris, bacteria, and basically everything else you don't want inside you. It also forms a protective barrier that protects from damage.

Within the epidermis, melanocytes create melanin to help protect from UV-rays. Lymphocytes and Langerhans cells help to neutralize pathogens.

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You are exiting a highway and need to slow down on the off-ramp in order to make the curve. It is rainy and the coefficient of s

Radda [10]

Answer:

11.87m/s

Explanation:

To solve this problem it is necessary to apply the concepts related to frictional force and centripetal force.

The frictional force of an object is given by the equation

$F_r = \mu N$

Where,

$\mu =$ Friction Coefficient

N = Normal Force, given also as mass for acceleration gravity

In the other hand we have that centripetal force is given by,

$F_c= \frac{mv^2}{R}$

The force experienced to stay on the road through friction is equal to that of the centripetal force, therefore

$F_r = F_c$

$\mu mg = \frac{mv^2}{R}$

Re-arrange to find the velocity,

$V = \sqrt{R\mu g}$

$V = \sqrt{36*0.4*9.8}$

$V = 11.87m/s$

Therefore the speed that it is necessaty to slow down the car in order to make the curve without sliding is 11.87m/s

5 0

3 years ago

Show all work: A rock contains 125g of a radioactive isotope with a half-life of 150,000 years and 875g of its daughter material

Xelga [282]

Answer:

$t = 500000\,years$

Explanation:

The time constant of the radioactive isotope is:

$\tau = \frac{150000\,years}{\ln 2}$

$\tau = 216404.256\,years$

The isotope decay is predicted by the following model:

$\frac{m}{m_{o}} = e^{-\frac{t}{\tau} }$

$\frac{125\,g}{125\,g + 875\,g} = e^{-\frac{t}{216404.256\,years} }$

$0.125 = e^{-\frac{t}{216404.256} }$

The age of the rock is determined after algebraic handling:

$\ln 0.125 = -\frac{t}{216404.256}$

$t = 500000\,years$

4 0

4 years ago

A red 120 kg bumper car moving at 4 m/s collides with a green 100 kg bumper car moving at 3 m/s. The red bumper car bounces off

Mariulka [41]

We can utilize the equation pi=pf (p=momentum). because p=mv, we can sub in the initial masses and velocities as well as the finals in order to form an equation. this results in 120(4)+100(3)=120(2)+100x. this can be simplified to 540=100x, or x=5.4 m/s.

6 0

3 years ago

Suppose a car is traveling in the negative x-direction and comes to a stop. What is the sign of that car’s acceleration? How do

Oduvanchick [21]

We have equation of motion v = u + at

Where v = final velocity, u = initial velocity, a = acceleration, and t = time

In this case car is travelling in -x direction

Velocity of car = displacement / time

Since displacement value is increasing in negative x axis it's initial velocity is negative

And it's final velocity is zero since it comes to rest, and time is also positive

So, v= u+ at => 0 = -u + at

So, a = u/t

Which is positive and along positive X - direction

7 0

4 years ago

Simple machines are widely used in our daily life. why?<br>

HACTEHA [7]

Answer:

Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever.

7 0

3 years ago

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