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docker41 [41]
2 years ago
8

the hot gas lines need to be insulated? A never B always C if they are exposed to cold temperatures that could cause the refrige

rant to condense in the line D for systems using hfc refrigerants
Physics
1 answer:
muminat2 years ago
8 0
The answer is a because it never needs to be insulated
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The unit for atomic mass is <br> A. Gram<br> B. Amu <br> C. Pound <br> D. None of the above
DIA [1.3K]

It's measured in Amu, so the answer is B.

6 0
3 years ago
Read 2 more answers
A car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.76 m/s2 for t1 = 20 s. At that point the
Ludmilka [50]

Answer:

<em>1) an expression for the car's speed is given as </em>

<em>v = u + at</em>

<em>where </em>

<em>v is the car's speed</em>

<em>u is the initial speed of the car </em>

<em>a is the car's acceleration</em>

<em>t is the time spent accelerating</em>

<em>2) The car does not hit the tree limb</em>

Explanation:

The initial velocity of the car = 0 m/s  (since it accelerates from rest)

acceleration of the car = 1.76 m/s

time spent accelerating = 20 s

For the car's speed just before the driver begins braking, we use the expression

<em>v = u + at</em>

where v is the final speed of the car just before the driver begins braking

u is the initial velocity with which the car starts moving

a is the acceleration of the car

t is the time spent accelerating from u to v

substituting values, we have

v = 0 + 1.76(20)

v = 0 + 35.2

the car's speed v =<em> 35.2 m/s</em>

In this time the car accelerates, the car moves a distance given by

s = ut + \frac{1}{2}at^2

where s is the distance covered in this time

u is the initial speed of the vehicle

a is the acceleration

t is the time taken

substituting, we have

s = 0(20) + \frac{1}{2}(1.76)20^{2}

s = 0 + 352

distance s = <em>352 m</em>

When the driver brakes, we have

time spent braking = 5 s

acceleration = -5.93 m/s

and the distance to the limb = 550 m from where the car begun

to get the distance covered in this period, we use the expression

s = ut + \frac{1}{2}at^2

where s is the distance traveled at this time

u is the speed of the car before it starts braking = 35.2 m/s

a is the acceleration at this point

t is the time taken to decelerate to a stop

substituting values, we have

s = 35.2(5) + \frac{1}{2}(-5.93 x 5^2)

s = 176 - 74.125

s = <em>101.88 m</em>

Total distance moved by the car = 352 m + 101.88 m = <em>453.88 m</em>

Since the total distance traveled by the car is less than the distance from the starting point to the place where the tree limb is, the car does not hit the tree limb.

5 0
3 years ago
List the number of atoms for each element in this compound: \(CaCO_{3} \)
borishaifa [10]

Number of element atom for element,

Calcium (Ca) = 1

Carbon (C) = 1

Oxygen (O) = 3

3 0
3 years ago
During each cycle of operation a refrigerator absorbs 56 cal from the freezer compartment and expels 81 cal tothe room. If one c
Alexandra [31]

Answer:

138.18 minutes

Explanation:

L_v = Latent heat of water at 0°C = 80 cal/g

m = Mass of water = 570 g

Heat removed for freezing

Q=mL_v\\\Rightarrow Q=570\times 80\\\Rightarrow Q=45600\ cal

Let N be the number of cycles and each cycle removes 56 cal from the freezer.

So,

55\times N=45600\\\Rightarrow N=\frac{45600}{55}

Each cycle takes 10 seconds so the total time would be

\frac{45600}{55}\times \frac{10}{60}=138.18\ minutes

The total time taken to freeze 138.18 minutes

6 0
2 years ago
Which of the following is not a measurement?
navik [9.2K]

Answer:

120 is the correct answer

4 0
2 years ago
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