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weeeeeb [17]
3 years ago
6

Suppose you must remove an average of 3.9×108J of thermal energy per day to keep your house cool during the summer. Part A If yo

u upgrade from an old air conditioner with a COP of 2.3 to a new air conditioner with a COP of 6.0, by how many joules is the required mechanical work reduced each day?
Engineering
1 answer:
noname [10]3 years ago
3 0

Answer:

The required mechanical work is required to reduce each day by 1.05×10^8 Joules.

Explanation:

Coefficient of Performance (COP) = Q/W

Q is thermal energy absorbed by the air conditioner

W is mechanical work done

Q = 3.9×10^8 J

COP of old air conditioner = 2.3

W = Q/COP = 3.9×10^8/2.3 = 1.70×10^8 J

COP of new air conditioner = 6

W = Q/COP = 3.9×10^8/6 = 6.5×10^7 J

Reduction in mechanical work = (1.7×10^8) - (6.5×10^7) = 1.05×10^8 J

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A freeway is being designed for a location in rolling terrain. The expected free-flow speed is 55 mi/h. During the peak hour, it
balu736 [363]

Answer:

3.

Explanation:

We start calcualting the factor for heavy-vehicle, that is,

f_{HV} = \frac{1}{1+P_T(E_T-1)+P_R(E_R-1)}

E_T = 2.5 for rolling terrain, so, replacing,

f_{HV} = \frac{1}{1+0.18(2.5-1)+0}

f_{HV} = 0.7874

We calculate the number of lanes by using the relation as follow:

N=\frac{V}{\upsilon_p PHF f_{HV} f_p}

N=\frac{2700}{1915*0.88*0.7874*1}

N= 2.035

In this way the necessary number of lanes is 3.

Note: To calculate \upsilon_p you need to consult the Exhibit 23-2

in 'Highway capacity Manual' for 55mph and the LOS D criteria.

6 0
4 years ago
The function f determines the cost (in dollars) of a new Honda Accord in terms of the number of years t since 2000. That is, f (
lutik1710 [3]

Answer:

f(5)

Explanation:

Function notation  is  a precise way of giving information about a function without need for a lengthy written explanation. The most common function notation is f (x) which is interpreted as "f of x".

For the year 2005,

t = 2005 -2000

= 5

Using the function notation to represent the cost (in dollars) of a new Accord in 2005 is f(5)

7 0
4 years ago
Read 2 more answers
The knob at the front of the miter saw about belt height is used to adjust the miter angle true or false
irinina [24]

Answer:

True.

Explanation:

There are two basic saw angles, and the little nob on the front controls the one angle, and the one on the rear controls the other.

4 0
3 years ago
Question Set 22.1 Using the count method, find the number of occurrences of the character 's' in the string 'mississippi'.2.2 In
Gnom [1K]

Answer:

# Program is written in python

# 22.1 Using the count method, find the number of occurrences of the character 's' in the string 'mississippi'.

# initializing string

Stringtocheck = "mississippi"

# using count() to get count of s

counter = Stringtocheck.count('s')

# printing result

print ("Count of s is : " + str(counter))

# 2.2 In the string 'mississippi', replace all occurrences of the substring 'iss' with 'ox

# Here, we'll make use of replace() method

# Prints the string by replacing iss by ox

print(Stringtocheck.replace("iss", "ox"))

#2.3 Find the index of the first occurrence of 'p' in 'mississippi'

# declare substring

substring = 'p'

# Find index

index = Stringtocheck.find(substring)

# Print index

print(index)

# End of program

8 0
3 years ago
A motor whose pulley is 80mm in diameter is rotating at 30 revolutions per minute and is connected by a belt to another pulley o
Firdavs [7]

Answer:

169

Explanation:

ye men thats the answer

8 0
3 years ago
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