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coldgirl [10]
3 years ago
13

a student that just received their driver's license decides to buy a new car. he remembers from physics class that heat engines

have thermal efficiency that can be calculated. he asks the car dealer for a car that has a high thermal efficiency rating. the car dealer say he has a car that is 100% efficient. which law of thermodynamics best describes why the car cannot be 100% efficient?
Physics
1 answer:
blsea [12.9K]3 years ago
5 0

Answer: the first law of thermodynamics

Explanation:

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Why does an object in motion stay in motion unless acted on by an unbalanced force?
Svet_ta [14]

Answer: A) because forces are what stop and start motion

Explanation:

From Newton's first law, an object tends to stay in state of rest or motion unless acted upon by an unbalanced external force. This is also known law of inertia. This is because a force can stop or start a motion. A force cause body to accelerate to decelerate otherwise the body continues with constant speed.

7 0
3 years ago
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Cohort studies allow the investigator to examine multiple outcomes and multiple exposures. Consider the following three exposure
mojhsa [17]

Answer:

See the explanation for the answer.

Explanation:

                          <u>Cohort study for smoking</u>

                      <u>Outcomes that were examined</u>

1. People at risk of lung cancer due to smoking

2. Influence of outdoor air pollution in lung cancer

3. Variation in tobacco smoking and heavy tobacco smoking was observed.

4. Occupational factors and housing factor were observed.

                       

                         <u>Cohort study for low vitamin D</u>

                      <u>Outcomes that were examined</u>

1. People at risk of vitamin D deficiency.

2. Observing value in summer.

3. Correlating vitamin D value with weather and age

4. 25-hydroxy vitamin D was observed.

                         <u>Cohort study for cold weather</u>

                      <u>Outcomes that were examined</u>

1. Allergic and asthma risked people were observed.

2. effect on the people when temperature goes up.

3. Observation on the most harsh weather day.

4. Correlating it with age and analysis.

3 0
3 years ago
The cheetah, the fastest of land animals, can run a distance of 274 m in 8.65 s at its top speed. What is the cheetahs tips spee
ycow [4]

Answer:

Top speed is 31.68 m/s

Explanation:

Speed of a body is the distance traveled by the body in unit time.

Speed is generally expressed in meter per second or kilometer per hour.

Here, the cheetah travels a distance of 274 m in 8.65 s.

Therefore, speed of cheetah is the distance traveled by it in one second.

For 8.65 s, distance traveled is 274 m

For 1 s, distance traveled will be \frac{274}{8.65} meters per second. This value is called speed.

So, speed is given as the ratio of the distance traveled to that of the time taken.

∴ Top speed of cheetah is given as:

v_{max}=\frac{274}{8.65}=31.68 \textrm{ m/s}

Here, v_{max} is the top speed of cheetah.

7 0
4 years ago
Which of these is most likely to lead directly to a black market?
Nookie1986 [14]
 I would say it's rationing: if people are only allowed a certain number of something (let's say: bottles of cooking oil), then the people who are entitled to is (as all are) but don't need is as much are likely to try to make profit by trying to sell it on a black market.
4 0
3 years ago
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Help plz i have until 4.20 plz
Setler [38]

Answer:

Substance 1 because it became a liquid faster

Explanation:

8 0
3 years ago
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