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4 years ago

The car salesman tells you that the car can go from a stop position to 60 mph in six seconds is giving you the car’s rate of

1 answer:

5 0

The salesman is telling you the average magnitude of the car's acceleration.

| Acceleration | = (change in speed) / (time for the change)

| Acceleration | = (60 mi/hr) / (6 sec)

| Acceleration | = 10 miles/hr-sec

That would be 36,000 miles per hour squared,
or 0.0028 mile per second squared.

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A Carnot engine operates between temperature levels of 600 K and 300 K. It drives a Carnot refrigerator, which provides cooling

KATRIN_1 [288]

Explanation:

Formula for maximum efficiency of a Carnot refrigerator is as follows.

$\frac{W}{Q_{H_{1}}} = \frac{T_{H_{1}} - T_{C_{1}}}{T_{H_{1}}}$ ..... (1)

And, formula for maximum efficiency of Carnot refrigerator is as follows.

$\frac{W}{Q_{C_{2}}} = \frac{T_{H_{2}} - T_{C_{2}}}{T_{C_{2}}}$ ...... (2)

Now, equating both equations (1) and (2) as follows.

$Q_{C_{2}} \frac{T_{H_{2}} - T_{C_{2}}}{T_{C_{2}}}$ = $Q_{H_{1}} \frac{T_{H_{1}} - T_{C_{1}}}{T_{H_{1}}}$

$\gamma = \frac{Q_{C_{2}}}{Q_{H_{1}}}$

= $\frac{T_{C_{2}}}{T_{H_{1}}} (\frac{T_{H_{1}} - T_{C_{1}}}{T_{H_{2}} - T_{C_{2}}})$

= $\frac{250}{600} (\frac{(600 - 300)K}{300 K - 250 K})$

= 2.5

Thus, we can conclude that the ratio of heat extracted by the refrigerator ("cooling load") to the heat delivered to the engine ("heating load") is 2.5.

4 0

3 years ago

What is the meaning of smooth?

damaskus [11]

A surface in which is flat or very soft to the touch and reduces splinters or anything sticking out, having an surface which does not have lumps, or indentations.

5 0

3 years ago

What is the formula for finding your maximum heart rate

Readme [11.4K]

You can do it in two ways

1) 220-your age
2) <span>206.9-(0.67*your age)

Hope this helped :)</span>

5 0

3 years ago

If the strings have the same thickness but different lengths, which of the following parameters, if any, willbe different in the

Vinil7 [7]

Answer:

If the strings have same thickness but different lengths then these parameters wave frequency, speed, wavelength will be different in the two strings. so the option d) None of the above is correct.

Explanation:

5 0

3 years ago

When the formula m*g=F-Fg is used?

valina [46]

The formula (ma = F - Fg) is used to determine the net upward force acting on a body.

<h3>What is net upward force acting on a body?</h3>

The net upward force acting on a body is the resultant or sum of all the upward forces acting on a body at a given time.

ma = F - Fg

where;

F is the applied force
Fg is the force of gravity
ma is the resultant force

Thus, the formula (ma = F - Fg) is used to determine the net upward force acting on a body.

Learn more about force here: brainly.com/question/12970081

#SPJ1

3 0

2 years ago