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3 years ago

12

Need help with 7 questions I'll give 26 points for the best answer!!

2 answers:

GaryK [48]3 years ago

6 0

Room temperature

Oxygen

pychu [463]3 years ago

4 0

Answer:

Very cold temperatures
Chromium
Oxygen
Room temperature water
Distillation
Newton
The same

Explanation:

Superconductors perform best at very cold temperatures because resistivity of this kind of materials decays drastically with temperature.
Chromium is most likely to be the best conductor of electricity because it belongs to the Transition Metal group of the periodic table.
Oxygen is likely to be the best electrical insulator because it belongs to the Non Metal group, and is mostly found in gas state.
Water has lower viscosity than any oil at any temperature.
Distillation is a separation procedure that uses the difference of boiling points of two mixed liquids, evaporating one of them by heating the mix at an intermediate temperature, right between both boiling points.
Since weight is a force it must be measured in newtons.
Mass is the measurement of the amount of particles in a body. Since moving a body doesn't change its amount of particles, then the mass will be the same here and there.

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What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room whose ambient temperature is 22

SIZIF [17.4K]

Answer:

$5.45\times 10^{-4}$ W

Explanation:

$T_{r}$ = Temperature of the room = 22.0 °C = 22 + 273 = 295 K

$T_{s}$ = Temperature of the skin = 33.0 °C = 33 + 273 = 306 K

$A$ = Surface area = 1.50 m²

$\epsilon$ = emissivity = 0.97

$\sigma$ = Stefan's constant = 5.67 x 10⁻⁸ Wm⁻² K⁻⁴

Rate of heat transfer is given as

$R = \epsilon \sigma A (T_{s}^{2} - T_{r}^{2})$

$R = (0.97)(5.67\times 10^{-8}) (1.50) ((306)^{2} - (295)^{2})$

$R = 5.45\times 10^{-4}$ W

3 0

3 years ago

The __________ eventually becomes the muscles, skeleton, circulatory system, and other internal organs.

never [62]

Answer:

Mesoderm.....

Explanation:

Endoderm becomes internal organ

4 0

3 years ago

Air expands adiabatically in a piston–cylinder assembly from an initial state where p1 = 100 lbf/in.2, v1 = 3.704 ft3/lb, and T1

lutik1710 [3]

Answer:

Final temperature is equal to 1291.63°R

Explanation:

given,

p₁ = 100 lb f/in², v₁ = 3.704 ft³/lb, and T₁ = 1000 °R

p₂ = 30 lb f/in² n = 1.4

Δ u = 0.171(T₂ - T₁)

we know for poly tropic process

p vⁿ = constant

p₁ v₁ⁿ = p₂ v₂ⁿ

100 × 3.704¹°⁴ = 30 × v₂¹°⁴

v₂ = 8.753 ft³/lb

work done for poly tropic process

W = $\dfrac{p_1v_1-p_2v_2}{n-1}$

= $\dfrac{100\times 3.704-30\times 8.753}{1.4-1}$

= 269.525 lbf/in².ft³

W = $\dfrac{269.525}{5.40395}$ Btu/lb

= 49.87 Btu/lb

in the piston cylinder arrangement air is expanding acrobatically

Δ q = Δu + w

Δ u = - w

0.171(T₂ - T₁) = -49.87

0.171(T₁ - T₂) = -49.87

0.171 T₂ = 0.171 × 1000 + 49.87

T₂ = 1291.63 °R

Final temperature is equal to 1291.63°R

5 0

3 years ago

What two motions combine to produce an orbit?

Ivenika [448]

I'm pretty sure it's Inertia and Gravity

Inertia deals with an object's tendency to stay in motion at a constant speed.

Hopefully this helped and good luck.

8 0

3 years ago

When a current of 0.015 A passes through human body at 240 volts p.d it<br><br>causes

geniusboy [140]

Explanation:

Given that,

Current, I = 0.015 A

Voltage, V = 240 volts

We need to find the resistance. Using Ohm's law we can find it as follows :

$V=IR\\\\R=\dfrac{V}{I}\\\\R=\dfrac{240}{0.015}\\\\R=16000\ \Omega$

So, When a current of 0.015 A passes through human body at 240 volts p.d it causes 16000 ohms of resistance.

3 0

3 years ago