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Fiesta28 [93]
3 years ago
12

How does warming up the tires on a car increase grip with the pavement?

Engineering
1 answer:
ICE Princess25 [194]3 years ago
8 0

Answer:

because burning rubber increases the grip power

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One-dimensional, steady-state conduction with uniform internal energy generation occurs in a plane wall with a thickness of 50 m
uysha [10]

Answer: please help me tooo

Explanation:

4 0
3 years ago
g A food department is kept at -12oC by a refrigerator in an environment at 30oC. The total heat gain to the food department is
boyakko [2]

Answer:

a) \dot W = 0.417\,kW, b) COP_{R} = 2.198, c) Irreversible.

Explanation:

a) The power input required by the refrigerator is:

\dot W = \dot Q_{H} - \dot Q_{L}

\dot W = \left(4800\,\frac{kJ}{h} - 3300\,\frac{kJ}{h}\right)\cdot \left(\frac{1}{3600} \,\frac{h}{s} \right)

\dot W = 0.417\,kW

b) The Coefficient of Performance of the refrigerator is:

COP_{R} = \frac{\dot Q_{L}}{\dot W}

COP_{R} = \frac{3300\,\frac{kJ}{h} }{(0.417\,kW)\cdot \left(3600\,\frac{s}{h} \right)}

COP_{R} = 2.198

c) The maximum ideal Coefficient of Performance of the refrigeration is given by the inverse Carnot's Cycle:

COP_{R,ideal} = \frac{T_{L}}{T_{H}-T_{L}}

COP_{R,ideal} = \frac{261.15\,K}{303.15\,K - 261.15\,K}

COP_{R,ideal} = 6.218

The refrigeration cycle is irreversible, as COP_{R} < COP_{R,ideal}.

3 0
3 years ago
An engineer must design a rectangular box that has a volume of 9 m3 and that has a bottom whose length is twice its width. What
Jet001 [13]

Answer:

Length =3   Height = 2   and  Width = \frac{3}{2}

Explanation:

Given

Volume = 9m^3

Represent the height as h, the length as l and the width as w.

From the question:

Length = 2 * Width

l = 2w

Volume of a box is calculated as:

V = l*w*h

This gives:

V = 2w *w*h

V = 2w^2h

Substitute 9 for V

9 = 2w^2h

Make h the subject:

h = \frac{9}{2w^2}

The surface area is calculated as:

A = 2(lw + lh + hw)

Recall that: l = 2w

A = 2(2w*w + 2w*h + hw)

A = 2(2w^2 + 2wh + hw)

A = 2(2w^2 + 3wh)

A = 4w^2 + 6wh

Recall that: h = \frac{9}{2w^2}

So:

A = 4w^2 + 6w * \frac{9}{2w^2}

A = 4w^2 + 6* \frac{9}{2w}

A = 4w^2 + \frac{6* 9}{2w}

A = 4w^2 + \frac{3* 9}{w}

A = 4w^2 + \frac{27}{w}

To minimize the surface area, we have to differentiate with respect to w

A' = 8w - 27w^{-2}

Set A' to 0

0 = 8w - 27w^{-2}

Add 27w^{-2} to both sides

27w^{-2} = 8w

Multiply both sides by w^2

27w^{-2}*w^2 = 8w*w^2

27 = 8w^3

Make w^3 the subject

w^3 = \frac{27}{8}

Solve for w

w = \sqrt[3]{\frac{27}{8}}

w = \frac{3}{2}

Recall that : h = \frac{9}{2w^2}   and l = 2w

h = \frac{9}{2 * \frac{3}{2}^2}

h = \frac{9}{2 * \frac{9}{4}}

h = \frac{9}{\frac{9}{2}}

h = 9/\frac{9}{2}

h = 9*\frac{2}{9}

h= 2

l = 2w

l = 2 * \frac{3}{2}

l = 3

Hence, the dimension that minimizes the surface area is:

Length =3   Height = 2   and  Width = \frac{3}{2}

6 0
3 years ago
A CPMT should include _____ who can oversee the security planning of the project and provide information on threats, vulnerabili
Talja [164]

Answer: information security managers

Explanation:

Information security managers is an individual in charge of making sure that company's or organization's equipments such as computers, network, data etc are protected against security breach, computer viruses, hackers, etc. The person also keep assets in confidentiality, integrity, and makes them available when needed. Failure to do this might lead to the loss of confidential data, security breach, cyber crimes, etc which will cause a serious set back in a company's operations especially in the information and technology department, it might also lead to fine sanctions from regulatory body for the failure to protect data, it will also lead to financial loss,etc.

6 0
4 years ago
Quinn’s relatives relayed a story about putting on a headset and seeing a digital world that they could walk around in and explo
Kryger [21]

Answer:

I know it is C)Virtual reality

Explanation:

Look at the clues

story about putting on a headset ( virtual reality head set!)

seeing a digital world (A virtual reality world)

they could walk around in (Fake walking you are basically jogging in place)

explore in order to see what ancient Benin looked like (Looking at a real place only digitally)

as if they were really there ( they think they are actually there)

The only reason I know all of this is because I have done virtual reality multiple times and I LOVED it SUPER fun ( I was doing archery) :) Hope this helps!

6 0
3 years ago
Read 2 more answers
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