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3 years ago

How to get to physics questions on this site?thanks

Physics

2 answers:

tester [92]3 years ago

6 0

Select physics on the ask question drop down menu.

NeX [460]3 years ago

3 0

-- If you want to ASK a Physics question . . .
Click on the orange block over there =====>
that says " + Ask a question".
In the new window, there is a drop-down menu where you can
select the category you want your question to go into.

-- If you want to SEE all the Physics questions that other people
have already asked . . .
. . . Click on the orange funnel up at the top, next to the "brainly.com" .
. . . This will open a screen full of all the questions that have been asked
in EVERY category ... all the questions on the site.
. . . At the top of the blue part of the screen, there's a strip that says "All Subjects".
When you click in there, you get a list of categories. You can click on the one
you're interested in, and the screen changes to only show questions in the
subject you picked.

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A hot-water stream at 80 ℃ enters a mixing chamber with a mass flow rate of 0.5 kg/s where it is mixed with a stream of cold wat

rewona [7]

Answer:

$\dot{m_{2}}=0.865 kg/s$

Explanation:

$\dot{m_1}= 0.5kg/s$

from steam tables , at 250 kPa, and at

T₁ = 80⁰C ⇒ h₁ = 335.02 kJ/kg

T₂ = 20⁰C⇒ h₂ = 83.915 kJ/kg

T₃ = 42⁰C ⇒ h₃ = 175.90 kJ/kg

we know

$\dot{m_{in}}=\dot{m_{out}}$

$\dot{m_{1}}+\dot{m_{2}}=\dot{m_{3}}$

according to energy balance equation

$\dot{m_{in}}h_{in}=\dot{m_{out}}h_{out}$

$\dot{m_{1}}h_{1}+\dot{m_{2}}h_{2}=\dot{m_{3}}h_{3}$

$\dot{m_{1}}h_{1}+\dot{m_{2}}h_{2}=(\dot{m_{1}}+\dot{m_{2}})h_{3}\\(0.5\times 335.02)+(\dot{m_{2}}\times 83.915)=(0.5+\dot{m_{2}})175.90\\\dot{m_{2}}=0.865 kg/s$

4 0

4 years ago

Now assume that the frictional force f is not at its maximum value. What is the relation between the torque Ï„ applied to each w

leva [86]

Answer:

a)The direction the frictional force will acts is in the positive x direction.

Explanation:

a)The direction the frictional force will acts is in the positive x direction

b)in the horizontal direction, the total force F(total) is equal to 4times the frictional force in the wheel.

F(total)=4f

''f'' is taken as the frictional force.

c)4times the normal force on each wheel minus the acceleration equals zero i.e 4N(wheel)-a=0

=4N(wheel)-mg=0

d) torque is the force that tends to bend rotation

ζ=rf

but acceleration=4×frictional force

cross multiply

f=ζ/r

f=ma/4

ma/4=ζ/r

a=4ζ/r

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3 years ago

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Scientists in a test lab are testing the hardness of a surface before constructing a building. Calculations indicate that the en

Luden [163]

Let's call this "certain amount" with a variable, x, (since it's not specified in the question, I will assume that the answer shall just be based on this variable).

So every additional floor will make the building sink by x, and let's make the unit cm, so x cm.

Now we know that the maximum depression is 20 cm, and it is also

x*y, where y is the number of floors.

So we have x*y=20,

therefore the number of floors is:
20/x or This is the answer

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3 years ago

Pure water has a pH of 7. Pure water _______. A. is a neutral substance B. could be either an acid or a base C. is a base D. is

malfutka [58]

A. is a neutral substance.

Only neutral substances (like pure water) can have a pH of 7.

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Answer:

600 metera

Explanation:

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3 years ago