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Novay_Z [31]
3 years ago
14

Which of the following is an example of convection? A.) a hot oven warming the air around it B.) hot air rising and cooler air f

alling C.) the rays of the Sun warming the earth D.) a hot object transferring heat to a cooler one
Biology
2 answers:
Snezhnost [94]3 years ago
5 0

D.hot air rising and cooler air falling. A is example of radiation or conduction. B is example of radiation. C is example of conduction. D is example of convection

pshichka [43]3 years ago
4 0

Answer:

B.) hot air rising and cooler air falling

Explanation:

Thermal convection is one of the forms of heat propagation that occurs in liquids and gases. It is called this because heat transmission occurs through circular convection currents that form because of the different density between fluids.

When we put water in a bowl to heat it in the stove flame, over time we can see bubbles forming at the bottom of the pan. The water at the bottom, heated by contact with the hot bottom of the pan, has increased volume, becomes less dense and rises. At the same time, its place is occupied by the coldest water above it. Thus, circulating currents form within the liquid, called convection currents.

For this reason, we can conclude that a good example of convection is "hot air rising and cooler air falling".

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A scientist plans to find out if dams harm a river ecosystem. He interviews 500 enviormentalists and 450 of them believe dams ar
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The answer is: the source of information could be biased

The scientist is interviewing environmentalists and then generalized their opinion as "people". An environmentalist is a person that cares about the environment, so they will more likely to deny the option that harms the environment. If the dam harmful to the environment, most environmentalists will not approve it.



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Question 10
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Answer:amino acids

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Can others, besides athletes, benefit from skill-related fitness? why?
prisoha [69]
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7 0
3 years ago
What organelle do you think this represents?<br> What is the analogy?
Elden [556K]

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cytoplasm

Explanation:

Cytoplasm is like the jell that holds everything in place

8 0
3 years ago
Read 2 more answers
A grad student has a culture of E. coli with a total volume of 1,800 mL, and OD reading at 550 nm of 1.7. He transfers 1 mL cult
Naily [24]

Answer:

Explanation:

We'll represent the dilution as the volume transferred/total volume in the tube after transfer. So for the first dilution, 1 ml of culture was added into 9ml of broth bringing the total volume to 10 ml i.e 1/10

For the second dilution, 0.1 mL was added to 0.9mL of broth bringing the total volume to 1mL i.e 0.1/1.0 (this is also the same as 1/10). In relation to the stock culture, this is represented as 1/100 (that is 1/10 (first dilution) * 1/10 (second dilution)

Giving that the same was done for dilution 3 and 4,

third dilution is represented as: 1/10 and the fourth as 1/10 as well

In relation to the stock, dilution 3 is 1/1000

dilution 4 is 1/10000

a. the dilution in the third tube is \frac{1}{1000} = 10^{3 or 1.0*10^{3}

b. the dilution spread onto the agar plate is the fourth dilution, that is, \frac{1}{10000} = 10^{4} or 1.0*10^{4}

c. Since the grad student got 386CFU/0.2mL (200 uL = 0.2mL),

the cells in 1mL is: 386/0.2 = 1930 = 1.93 * 10^{3}

the cells in 1800mL is therefore 1930*1800 = 3,474,000 = 3.4*1010^{6}

3 0
3 years ago
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