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4 years ago

What does a mu mean in physics

1 answer:

3 0

'mu' is a letter in the Greek alphabet. It looks like this: μ
If you need labels for quantities or variables in math or science,
you can use any letter from any alphabet you like ... just be sure
to explain what the symbol stands for somewhere on the page
where the equation or formula is.

I've seen 'mu' used to stand for 'micro-' when writing units.
For example:

" μ-meter " ... one millionth of a meter

" μ-farad " ... one millionth of a farad

" μ-second " ... one millionth of a second

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A man pushes a heavy box. if the man exerts a force of 200 N on the box to keep it moving at a constant velocity what is the fri

Ad libitum [116K]

Answer:

Kinectic friction is the answer to the lower part of the question

5 0

2 years ago

Consider a plywood square mounted on an axis that is perpendicular to the plane of the square and passes through the center of t

belka [17]

Answer:

T= 8.061N*m

Explanation:

The first thing to do is assume that the force is tangential to the square, so the torque is calculated as:

T = Fr

where F is the force, r the radius.

if we need the maximum torque we need the maximum radius, it means tha the radius is going to be the edge of the square.

Then, r is the distance between the edge and the center, so using the pythagorean theorem, r i equal to:

r = $\sqrt{(0.38m)^2+(0.38m)^2}$

r = 0.5374m

Finally, replacing the value of r and F, we get that the maximun torque is:

T = 15N(0.5374m)

T= 8.061N*m

4 0

4 years ago

Four main parts of a spiral galaxy

Svetlanka [38]

The 'Bulge', the 'Disk', the 'Spiral Arms', and the 'Halo' those are four parts of a spiral galaxy. Try finding out the many different types of galaxies to understand which is which.

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3 years ago

Read 2 more answers

Can anyone define thermostat and list electrical appliances that have a thermostat?

Tresset [83]

A thermostat is a switch that operates itself when the temperature
goes above or below a temperature that the user can set.

-- Before you go to bed, you set the thermostat for 65° .
If the temperature in the house goes below 65° during the night,
the thermostat turns on the furnace, and keeps it running until
the house warms up to 65°. Then it shuts the furnace off.

-- After breakfast, you set the thermostat for 75°.
If the temperature in the house goes above 75°, during the day,
the thermostat turns on the air conditioner, and keeps it running until
the house cools down to 75°. Then it shuts the air conditioner off.

-- On Sunday morning, you put the slow cooker on the kitchen counter,
and you throw in a big roast, a sliced onion, some baby carrots, some
sliced potatoes, some vegetable stock, salt, pepper, garlic, chili powder,
and tomato paste. Then you put the cover on, turn the power on, and
set the slow cooker to "LOW".  The heater in the slow cooker turns on.
Whenever the temperature in the crock gets higher than 160°, the
thermostat in the slow cooker turns off the heater, and keeps it off
until the crock cools down to 160°. Then the thermostat turns the
heater on again.
By dinner time, you have a hot, juicy, scrumptious pot roast, ready
to eat.  It's not too hot, not too cold, not too tough, not dried out, and
it melts in your mouth.
You're still thinking about it when you go to bed, and your mom gives you
a slice to take to school for your lunch on Monday.

4 0

3 years ago

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1200 kg and was approaching at

GuDViN [60]

Answer:

a) v = 11.24 m / s , θ = 17.76º b) Kf / K₀ = 0.4380

Explanation:

a) This is an exercise in collisions, therefore the conservation of the moment must be used

Let's define the system as formed by the two cars, therefore the forces during the crash are internal and the moment is conserved

Recall that moment is a vector quantity so it must be kept on each axis

X axis

initial moment. Before the crash

p₀ₓ = m₁ v₁

where v₁ = -25.00 me / s

the negative sign is because it is moving west and m₁ = 900 kg

final moment. After the crash

$p_{x f}$ = (m₁ + m₂) vx

p₀ₓ = p_{x f}

m₁ v₁ = (m₁ + m₂) vₓ

vₓ = m1 / (m₁ + m₂) v₁

let's calculate

vₓ = - 900 / (900 + 1200) 25

vₓ = - 10.7 m / s

Axis y

initial moment

$p_{oy}$ = m₂ v₂

where v₂ = - 6.00 m / s

the sign indicates that it is moving to the South

final moment

p_{fy}= (m₁ + m₂) $v_{y}$

p_{oy} = p_{fy}

m₂ v₂ = (m₁ + m₂) v_{y}

v_{y} = m₂ / (m₁ + m₂) v₂

we calculate

$v_{y}$ = 1200 / (900+ 1200) 6

$v_{y}$ = - 3,428 m / s

for the velocity module we use the Pythagorean theorem

v = √ (vₓ² + v_{y}²)

v = RA (10.7²2 + 3,428²2)

v = 11.24 m / s

now let's use trigonometry to encode the angle measured in the west clockwise (negative of the x axis)

tan θ = $v_{y}$ / Vₓ

θ = tan-1 v_{y} / vₓ)

θ = tan -1 (3,428 / 10.7)

θ = 17.76º

This angle is from the west to the south, that is, in the third quadrant.

b) To search for loss of the kinetic flow, calculate the kinetic enegy and then look for its relationship

Kf = 1/2 (m1 + m2) v2

K₀ = ½ m₁ v₁² + ½ m₂ v₂²

Kf = ½ (900 + 1200) 11.24 2

Kf = 1.3265 105 J

K₀ = ½ 900 25² + ½ 1200 6²

K₀ = 2,8125 10⁵ + 2,16 10₅4

K₀ = 3.0285 105J

the wasted energy is

Kf / K₀ = 1.3265 105 / 3.0285 105

Kf / K₀ = 0.4380

this is the fraction of kinetic energy that is conserved, transforming heat and transforming potential energy

5 0

3 years ago