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jasenka [17]
3 years ago
11

To reduce the drag coefficient and thus improve the fuel efficiency of cars,the design of side rearview mirrors has changed dram

atically in recent decades from asimple circular plate to a streamlined shape. Determine the amount of fuel and moneysaved per year as a result of replacing a 15-cm-diameter flat mirror by one with ahemispherical back. Assume the car is driven 25,000 km a year at an average speedof 95 km/hr. Take the density and price of gasoline to be 0.75 kg/L and $0.90/L,respectively; the heating value of gasoline to be 44,000 kJ/kg and the overall efficiencyof the engine to be 30 percent.
Engineering
1 answer:
marissa [1.9K]3 years ago
4 0

Answer:

Amount of fuel used per year is supposed to be 34150 KJ/kg

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Ô tô có khối lượng m (kg) đặt tại trung tâm h . Khoảng cách từ h tới 2 bánh xe hai bên của a (m) và b (m) , khoảng cách vết bánh
Nutka1998 [239]

Answer:

wiwhwnwhwwbbwbwiwuwhwhehehewhehehheheheehehehehhehehwh

Explanation:

jwhwhwhwhwhwwhhahwhahahwh

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3 years ago
Is it better to do blue prints with paper and pencil or a computer program if you’re going to design a house? Why?
Hatshy [7]

Answer:

Computer program

Explanation:

I use Revit and its way better to do all that you can see 2D 3D the measurements and its super easy to use hope this helps

6 0
3 years ago
Information such as tolerances and scale can be found in the _______________ of an engineering drawing.
nasty-shy [4]

Answer:

Information such as tolerance and scale can be found in the <u>title block</u> of an engineering drawing

Explanation:

The title block of an engineering drawing can normally be found on the lower right and corner of an engineering drawing and it carries the information that are used to specify details that are specific the drawing including, the name of the project, the name of the designer, the name of the client, the sheet number, the drawing tolerance, the scale, the issue date, and other relevant information, required to link the drawing with the actual structure or item

8 0
3 years ago
Technicians have to determine the flow rate of water in a pipe with the aid of a venturi installation and a mercury au.oaeter. T
Schach [20]

Answer:

Manometric difference x=142.85 mm.

Explanation:

Given :

 Pipe diameter d_1=40 mm

venturi meter d_2=20 mm

We can know that discharge through venturi meter is given as

Q=C_d\dfrac{A_1A_2\sqrt{2gh}}{\sqrt {A_1^2-A_2^2}}

A_1=1.24\times 10^{-3},A_2=3.12\times 10^{-4}

Q=A_1V_1

Q=1.24\times 10^{-3}\times 1.5=0.00186 m^3/s

0.00186=0.97\dfrac{1.24\times 10^{-3}\times 3.12\times 10^{-4} \sqrt{2gh}}{\sqrt {(1.24\times 10^{-3})^2-(3.12\times 10^{-4})^2}}

h=1.8 m

We know that h=x\left (\dfrac{\rho_{hg}}{\rho_w}-1\right )

Where x is the manometric deflection

⇒ 1.8=x\left (\dfrac{13600}{1000}-1\right )

So x=14.28 mm

Manometric difference x=142.85 mm.

7 0
3 years ago
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