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4 years ago

Explain why the mass and weight should not be used interchangeably?

1 answer:

4 0

Mass is a property of an object, a cloud of gas, a puddle of liquid, or a lump of goo, and doesn't necessarily change when the object moves to a different location or environment. It depends only on the object itself.

Weight is completely a product of what else is in the nearby location,so it can easily change. It's the result of the gravitational forces between two objects . . . the first one with the constant mass, and another one that also has mass. The forces between them, and therefore the weight, depend on both masses, AND on the distance between them.

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In the first stage of a two-stage Carnot engine, energy is absorbed as heat Q1 at temperature T1 = 500 K, work W1 is done, and e

Nataly [62]

Answer:

Efficiency = 52%

Explanation:

Given:

First stage

heat absorbed, Q₁ at temperature T₁ = 500 K

Heat released, Q₂ at temperature T₂ = 430 K

and the work done is W₁

Second stage

Heat released, Q₂ at temperature T₂ = 430 K

Heat released, Q₃ at temperature T₃ = 240 K

and the work done is W₂

Total work done, W = W₁ + W₂

Now,

The efficiency is given as:

$\eta=\frac{\textup{Total\ work\ done}}{\textup{Energy\ provided}}$

Work done = change in heat

thus,

W₁ = Q₁ - Q₂

W₂ = Q₂ - Q₃

Thus,

$\eta=\frac{(Q_1-Q_2)\ +\ (Q_2-Q_3)}{Q_1}}$

$\eta=1-\frac{(Q_1-Q_3)}{Q_1}}$

$\eta=1-\frac{(Q_3)}{Q_1}}$

also,

$\frac{Q_1}{T_1}=\frac{Q_2}{T_2}=\frac{Q_3}{T_3}$

$\frac{T_3}{T_1}=\frac{Q_3}{Q_1}$

thus,

$\eta=1-\frac{(T_3)}{T_1}}$

thus,

$\eta=1-\frac{(240\ K)}{500\ K}}$

$\eta=0.52$

Efficiency = 52%

8 0

4 years ago

A jack is used to______ the force.

noname [10]

Answer:

A jack is used to lift the force.

I think that's the answer. I don't really understand the question.

4 0

3 years ago

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When comparing equal volumes of a stronger and weaker acid, what would be observed?

liraira [26]

If you are in plato the answer is B.

6 0

3 years ago

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What two things do you need to know to describe the velocity of an object?

pickupchik [31]

The distance it traveled and the time that it took to travel that distance

3 0

3 years ago

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Why do you need to wear a seatbelt when you are in a car?

Crank

Answer:

To protect you from fatal injuries and keep you secured in the case of an accident (my definition)

Explanation:

(Definition) Being buckled up during a crash helps keep you safe and secure inside your vehicle; being completely ejected from a vehicle is almost always deadly. If you don't wear your seat belt, you could be thrown into a rapidly opening frontal air bag. Such force could injure or even kill you.

4 0

3 years ago

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