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disa [49]
2 years ago
5

Which of the following statements is TRUE? (Points : 1) The dermis is avascular There are few sensory nerve fibers in the dermis

. Collagen fibers within the dermis are flexible and offer no resistance to overstretching. Dermal papillae project into and anchor the epidermis to the dermis.
Physics
1 answer:
UkoKoshka [18]2 years ago
8 0
TRUE: Dermal Papillae project into and anchor the epidermis to the dermis. 

The dermal papillae increases the surface area between the epidermis and dermis. It forms dermal ridges in hands, feet, and fingertips. It extends to the epidermis and contains blood vessels that supply epidermis with nutrients.

Aside from dermal papillae, the following are found in the dermis.
1) fibroblasts
2) adipocytes
3) macrophages
4) nerve endings
5) hair follicles
6) smooth muscles
7) glands
8) lymphatic vessels
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How much heat is required to change 1.0 kg of ice, originally at -20.0 degrees celcius, into steam at 110.0 degrees celcius? Ass
Marizza181 [45]

Answer:

Q = 3087460 J

Explanation:

As we know that first ice will convert into water

then water will heat to 100 degree celcius and then it will converted into vapor and then its temperature is raised to 110 degree C

First we will find the heat to take the ice at 0 degree and then convert it into water

Q_1 = ms_{ice}\Delta T + mL

Q_1 = 1(2100)(0 - (-20)) + 1(335000)

Q_1 = 42000 + 335000 = 377000 J

Now heat required to take it to 100 Degree then convert into vapor and then raise temperature to 110 degree

Q_2 = 1(4186)(100 - 0) + (1)(2250000) + 1(4186)(110 - 100)

Q_2 = 2710460 J

So total heat required is given as

Q = Q_1 + Q_2

Q = 377000 + 2710460

Q = 3087460 J

5 0
2 years ago
A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Su
larisa [96]

<u>Question:</u>

A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Such a device is called

Answer

a hysteresis loop.

an electrosolenoid.

a permanent magnet.

a ferromagnet.

an electromagnet

<u>Answer:</u>

A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Such a device is called an electromagnet.

<u>Explanation:</u>

When a magnet is processed by supplying electricity than it is called as electromagnet and therefore its strength can be fluctuated as dependent on amount of electricity supplied.

Here, when a iron piece is moved closer to a long coil of wire named solenoid physical interaction named electromagnetic force take place between two electrically charged particles.

This force is supplied by electromagnetic fields constructed from electric and magnetic field. This is also called as Lorentz force constituted from both electricity and magnetism. This property itself gives evidence of characteristics of material used for electromagnetism.

7 0
3 years ago
A gas bottle contains 0.250 mol of gas at 730 mm hg pressure. if the final pressure is 1.15 atm, how many moles of gas were adde
Ludmilka [50]

Answer: 0.049 mol



Explanation:



1) Data:


n₁ = 0.250 mol

p₁ = 730 mmHg

p₂ = 1.15 atm

n₂ - n₁ = ?


2) Assumptions:


i) ideal gas equation: pV = nRT


ii) V and T constants.


3) Solution:


i) Since the temperature and the volume must be assumed constant, you can simplify the ideal gas equation into:


pV = nRT ⇒ p/n = RT/V ⇒ p/n = constant.


ii) Then p₁ / n₁ = p₂ / n₂


⇒ n₂ = p₂ n₁ / p₁


iii) n₂ = 1.15atm × 760 mmHg/atm × 0.250 mol / 730mmHg = 0.299 mol


iv) n₂ - n₁ = 0.299 mol - 0.250 mol = 0.049 mol

7 0
3 years ago
Which of these materials is an example of an insulator?
geniusboy [140]
Rubber. The other three are metals, and therefore good conductors.
7 0
3 years ago
An emf of 28.0 mV is induced in a 501 turn coil when the current is changing at a rate of 12.0 A/s. What is the magnetic flux th
dmitriy555 [2]

Answer:

Φ = 5.589×10⁻⁵  Wb

Explanation:

The inductance of a coil is given as

L = e/(di/dt) ..................... Equation 1

Where L = inductance of the coil, e = induced e.m.f, di/dt = rate of change of current in the coil.

Also,

The inductance of each turn of the coil when a magnetic field is step up in the coil  is

L = NΦ/i ................. Equation 2

Where N = number of turns, Φ = magnetic field, i = current.

equating equation 1 and equation 2

e/(di/dt) = NΦ/i

making Φ the subject of the equation,

Φ = (e×i)/N.(di/dt) .................. Equation 3

Given: e = 28.0 mV = 0.028 V, N = 501 turns, di/dt = 12.0 A/s, i = 4.00 a

Substitute into equation 3,

Φ = (0.028×4)/(12×501)

Φ = 0.112/2004

Φ = 5.589×10⁻⁵ Weber

Φ = 5.589×10⁻⁵ Wb

6 0
3 years ago
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