2 years ago

Which type of container traps the most heat a shoe box covered in aluminum foil plastic wrap or wax paper?

Engineering

1 answer:

Aliun [14]2 years ago

5 0

Answer:

shoe box covered in aluminum foil

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Explain mathematically whether the divergence of the curl of a vector field is

svp [43]

Answer:

yes

Explanation:

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2 years ago

What is a material safety data sheet? A. a categorized list of hazardous substances in an industry B. a document with safety inf

horsena [70]

Answer: A.

Explanation:

safety data sheet are documents that list information relating to occupational safety and health for the use of various substances and products.

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2 years ago

A Venturi meter (see below) uses the principles of the Bernoulli equation to measure the velocity of a flow in a reactor system.

LenaWriter [7]

Answer:

Q=0.000604 m³/s

Explanation:

Given that

d₁=5 cm

d₂=1 cm

P= 30 KPa

Density of water ,ρ=1000 kg/m³

As we know that volume flow rate Q given as

$Q=A_1A_2\sqrt{\dfrac{\dfrac{2\Delta P}{\rho}}{A_1^2-A_2^2}}$

$A_1=\dfrac{\pi}{4}\times 0.05^2\ m^2$

A₁=0.0019 m²

$A_2\dfrac{\pi}{4}\times 0.01^2\ m^2$

A₂=0.000078 m²

$Q=0.0019 \times 0.000078 \sqrt{\dfrac{\dfrac{2\times 30\times 1000}{1000}}{0.0019^2-0.000078^2}}\ m^3/s$

Q=0.000604 m³/s

7 0

3 years ago

The heat rate is essentially the reciprocal of the thermal efficiency. a)- True b)- False

jeyben [28]

Answer:

a). TRUE

Explanation:

Thermal efficiency of a system is the defined as the ratio of the net work done to the total heat input to the system. It is a dimensionless quantity.

Mathematically, thermal efficiency is

η = net work done / heat input

While heat rate is the reciprocal of efficiency. It is defined as the ratio of heat supplied to the system to the useful work done.

Mathematically, heat rate is

Heat rate = heat input / net work done

Thus from above we can see that heat rate is the reciprocal of thermal efficiency.

Thus, Heat rate is reciprocal of thermal efficiency.

4 0

3 years ago

Many manufacturers currently offer SAE level _________ equipped vehicles

Pepsi [2]

Answer should be B.3 hopefully

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3 years ago