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2 years ago

10

Why do the pipes in a steam-heating system need to be insulated?

1 answer:

qaws [65]2 years ago

3 0

Answer:

1. Increase Efficiency: Insulating the condensate or hot water return lines reduces heat loss from the water returning to the boiler. The hotter the water returning to the boiler is, the quicker it is to convert back to steam, which takes less energy to accomplish.

Explanation:

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A hot-air balloon is ascending at the rate of 12 m/s and is 80 m above the ground when a package is dropped over the side. (a) H

Debora [2.8K]

Answer:

Explanation:

Given

balloon is ascending at the rate of $u=12\ m/s$

Balloon is at a height of $s=80\ m$

As the package is dropped from the balloon it must possess the same initial velocity as the balloon

using

$v^2-u^2=2as$

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

$v^2=12^2+2\times 9.8\times 80$

$v^2=1712$

$v=41.37\ m/s$

time taken is given by

$v=u+at$

substituting values

$41.37=-12+9.8\times t$

as we consider downward direction as positive

$t=\frac{53.37}{9.8}$

$t=5.44\ s$

therefore time taken to reach the bottom is t=5.44 s

6 0

2 years ago

In _______ atomic model, negative electrons orbit the positively charged nucleus.

Shalnov [3]

In (A. Dalton's) atomic model, negative electrons orbit the positively charged nucleus.

8 0

2 years ago

Read 2 more answers

Can someone please give me the answer by 10 minutes

Dmitry [639]

24N is the answer
You would need to multiply 8 until you get to a number.

8 0

1 year ago

A doubly ionized molecule (i.e., a molecule lacking two electrons) moving in a magnetic field experiences a magnetic force of 5.

Kobotan [32]

Explanation:

The given data is as follows.

F = $5.75 \times 10^{-16} N$

q = $1.6 \times 10^{-19} C$

v = 385 m/s

$sin (63.9^{o})$ = 0.876

Now, we will calculate the magnitude of magnetic field as follows.

B = $\frac{F}{qv sin (\theta)}$

= $\frac{5.75 \times 10^{-16} N}{1.6 \times 10^{-19} C \times 385 m/s \times 0.876}$

= $0.01065 \times 10^{3}$ T

= 10.65 T

Thus, we can conclude that magnitude of the magnetic field is 10.65 T.

4 0

2 years ago

A coating is being applied to reduce the reflectivity of a pane of glass to light with a wavelength of 522 nm incident near the

fredd [130]

Answer:

t = 94.91 nm

Explanation:

given,

wavelength of the light = 522 nm

refractive index of the material = 1.375

we know the equation

c = ν λ

where ν is the frequency of the wave

c is the speed of light

$\nu= \dfrac{c}{\nu\lambda}$

$\nu = \dfrac{3\times 10^8}{522 \times 10^{-9}}$

ν = 5.75 x 10¹⁴ Hz

the thickness of the coating will be calculated using

$t = \dfrac{\lambda}{4\mu_{material}}$

$t = \dfrac{522 \times 10^{-9}}{4\times 1.375}$

t = 94.91 nm

the thickness of the coating will be equal to t = 94.91 nm

7 0

2 years ago