1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NeTakaya
3 years ago
14

For a refrigerator, COP<1 a) True b) False

Engineering
1 answer:
WINSTONCH [101]3 years ago
4 0

Answer:

False

Explanation:

COP is Coeficient of performance, it relates useful heat moved with work consumed, it is used in refrigerators and heat pumps.

For refrigerators the useful heat is the one extracted from the cold reservoir. Therefore:

COP = \frac{Tcold}{T.hot - Tcold}

This often exceeds 1.

You might be interested in
List two reasons why machined parts often require a high degree of precision.
Gekata [30.6K]

Explanation:

Precision machining is a subtractive process used in cases where material needs to be removed from a raw product to create the finished product. Precision machining can be used to create a wide variety of products, items, and parts for any number of different objects and materials. These parts usually require tight tolerances variation from nominal dimensions and from part to part, which means that there is not much room for error in the production of the piece. Repeatability and well-controlled tolerances are hallmarks of precision machining. Components, parts and finished durable products that are designed to maintain extremely tight tolerance margins and a high degree of durability are essential and common drivers for utilization of precision machining. For example, parts that need to work together as part of a machine may need to always align within a certain margin of 0.01mm to 0.05mm. Precision engineering and machining help to ensure these parts can not only be made precisely but can be produced with this level of accuracy over and over again.

3 0
3 years ago
Please guys do you need technical drawing to be a robotics or software engineer?
SSSSS [86.1K]

Answer:

Explanation:

No. If you just wanna write code you dont need that, but if you wanna be an Architect for designing robots or something then yeah

7 0
3 years ago
Read 2 more answers
Steam enters a heavily insulated throttling valve at 11 MPa, 600°C and exits at 5.5 MPa. Determine the final temperature of the
7nadin3 [17]

Answer: the final temperature of the steam 581.5 °C

Explanation:

Given that;

P₁ = 11 MPa

T₁ = 600°C

exit at; P₂= 5.5 MPa

Now from superheated steam table( p=11 MPa, T=600°C)

h₁ = 3615 kJ/kg  

h₁ = h₂ ( by throttling process and adiabatic isentholpic )

from saturated steam table at; ( h= 3615 kJ/kg, P= 5.5 MPa )

Temperature = 581.5 °C

Therefore the final temperature of the steam 581.5 °C

8 0
3 years ago
What information is needed to set up sales tax in QuickBooks Online for a client who only does business in their home state?
melisa1 [442]

Answer:

Their company address

When their last tax period started

How often they have to file a tax return

When they started collecting sales tax for the agency

Explanation:

For setup the sales tax information in Quickbooks online for a client who only does business in their home state, we need these information which are given below:

1. Their company addresses

2.  Last Tax Time period started

3.  How frequently they filed the tax return

3. when they begin to received sales tax

Therefore all the other options are not valid. Hence, ignored it

3 0
3 years ago
If the two 304-stainless-steel carriage bolts of the clamp each have a diameter of 10 mmmm, and they hold the cylinder snug with
S_A_V [24]

Answer: hello some data related to your question is missing attached below is the missing data

answer:

T2 = 265°C

Explanation:

First step : calculate sum of vertical forces

∑ y = 0

Fmg - 2(0.5 Fst ) = 0

∴Fmg = ( 12 * 10^6 ) ( 2 * π/4 (0.01)^2 )

          = 1884.96 N

Also determine the Compatibility equation in order to determine the change in Temperature

ΔT = 250°C

therefore Temperature at which average normal stress becomes 12.0 MPa

ΔT = T2 - T1

250°C = T2 - 15°C

T2 = 250 + 15 = 265°C

attached below is the detailed solution

4 0
3 years ago
Other questions:
  • A bar of steel has the minimum properties Se = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The bar is subjected to a steady torsio
    7·1 answer
  • An online identity is different and separate from an online profile
    12·1 answer
  • sa kasalukuyang panahon posible pakayang mag karoon ng panibagong kilusang propaganda at lilusang katipunan oo?at bakit​
    5·1 answer
  • Table 1(a) shows the marks obtained by 40 students in an examination
    11·1 answer
  • Plsssssss help me here​
    7·1 answer
  • If you always follow the same five steps to get ready for school, then you are following an algorithm.
    5·2 answers
  • PLZ HELP ASAP!!!
    6·1 answer
  • A coil consists of 200 turns of copper wire and have a cross-sectional area of 0.8 mmm square.The mean length per turn is 80 cm
    13·1 answer
  • This type of burn occurs when electrical current flows through tissues or bone, generating heat, and causing damage.
    10·1 answer
  • I’ll give you 100 points
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!