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提问人：网友anonymity 发布时间：2022-01-07

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Evaporation rates of hydrocarbon liquid from horizontal surfaces are approximately given by Where

Evaporation rates of hydrocarbon liquid from horizontal surfaces are approximately given by

$Evaporation rates of hydrocarbon liquid from horiz$

Where p is vapor pressure of the liquid and P is the atmospheric pressure. We have spilled a layer of lubricating oil on a metal drip pan in our garage. It forms a layer 1 mm thick. Its density is 1g/cm³and its molecular weight is 400 g/mol. Its vapor pressure is approximately 10^-7torr at 20℃. Estimate how long it will take all of this motor oil to evaporate at 20℃.

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更多“Evaporation rates of hydrocarbon liquid from horizontal surfaces are approximately given by Where”相关的问题

第1题

Call the Disk Doctorl

1 Desperate computer users who 'lose' the data from their disks can get in touch with

experts who, for a fee, will recover the lost information. One of these experts is Dave Smith, who, some years ago, set up a company called fl3ve,5 Disk Doctor Service Ltd. Dave and a few of his friends work from home and give all the money they earn to charity. The fees are always the same, no matter how precious the data on the disk is. Some people, however, are so grateful that they send extra money to Dave or to the charities his company supports. One oil company offered him Li ,000 for his help and a vet sent him a blank check

2 It would be hard to put a value on the things rescued by the Disk Doctor. There have been disks containing medical research, television scripts, manuscripts of whole books, a comedlan,5joke collection, a solicitor' s papers for a court case, and even Margaret Thatcher,5itinerary for a visit to eastern Europe. For this last case, Dave was asked if he would go in person to Mrs. Thatcher's office 'for security reasons,!

3 Disks are usually sent to the Disk Doctor by post, but sometimes people are in such

a hurry that they can't wait for the post. Radio scripts have had to be rushed by taxi to

Dave's house because they were needed for broadcasting the next day, for example. When the material has been recovered, the disk is returned to the sender with a diagnosis and a prescription for avoiding the problem in future. One grateful client, an author put a 'thank you' to Dave in the front of his book.' Dave saved mc from a cardiac arrest' , he wrote 'But,,says Dave, 'most people don't take any notice ol the doctor's advice!'

Read Passage 2 and decide whether the following statements are Jrue or False. Write T for True and F for False against the number of each of the statements on your Answer Sheet

11. Computer users can get back their lost data from their disks without any payment in Dave's company

12. The company named Dave's Disk Doctor Service Ltd is set up by Dave Smith

13. Dave and his friends earn a large amount of money, but they spend none

14. According to the different value of the data on the disk, people need to pay different amount of money for saving them

15. Most people will take notice of the disk doctor' s . advice after the disk is repaired

16. hopeless _________ (paragraph 1)

17. thankful_(paragraph 1)

18. to save _________ (paragraph 2)

19. lawyer_(paragraph 2)

20. to keep from happening_(paragraph 3)

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第2题

Studio la medicina e voglio diventare un medico.

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第3题

【单选题】Minor tasks should be ____________ to your assistant.

A、delegated

B、controlled

C、facilitated

D、dismissed

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第4题

The nerve distributing to the adductor pollicis is

A、musculocutaneous N.

B、median N.

C、ulnar N.

D、radial N.

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第5题

We say that a person has good manners if he or she behaves politely and is kind and helpful to others.Everyone likes a person with good manners but no one likes a person with bad manners. "Y es", you may say , " but what are good manners? How do I know what to do and what not to do?"

People all over the world agree that being well-mannered really means being kind and helping others, especially to those older or weaker than ourselves. If you remember this, you will not go very far wrong.

Here are some examples of the things that a well-mannered person does or does not do.

He never laughs at people when they are in trouble.Instead, he tries to help them. He is always kind, never cruel,either to people or to animals. When people are waiting for a bus, or in a post office, he takes his turn.He does not push to the front of the queue. In the bus, he gives his seat to an old person or a lady who is standing.If he accidentally bumps into someone, or gets in their way, he says, "excuse me" or "I'm sorry".

He says "please" when making a request, and "thank you" when he receives something. He stands up when speaking to a lady or an older person, and he does not sit down until the other person is seated. He does not interrupt other people when they are talking. He does not talk too much himself. He does not talk loudly or laugh loudly in public. When eating, he does not speak with his mouth full of food. He uses a handkerchief when he sneezes or coughs.

(1)、Which of the following is considered as being well-mannered?

A：Laughing at the weaker

B：Behaving impolitely

C：Helping older people

D：Being kind to ourselves

(2)、If you try to be kind and helpful to others, you ______.

A：will make a mistake

B：will be completely wrong

C：will be considered very polite

D：will not be regarded as being well-mannered

(3)、When waiting for a bus, a well-mannered person should ______.

A：try to stand in the front of the line

B：line up in a queue

C：give his seat to a lady

D：stand where he is and wait for his turn

(4)、According to this passage, a polite person ______.

A：will not break into other's conversation

B：will do most of the talking when speaking with others

C：will sit down before an older person does

D：will not speak without his mouth full of food when eating

(5)、The word "accidentally" (Line 5, Para. 4) means ______.

A：on purpose

B：by accident

C：in an accident

D：willingly

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第6题

As shown, a cannonball with mass m is fired with initial velocityand emission angle. The air resistance is proportional to the cannonball velocity, i.e.,, whereis a constant. The differential equation of motion of the cannonball can be

A、

B、

C、

D、

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第7题

Three homogeneous disks [图], [图] and [图] have t...

Three homogeneous disks,andhave the same radius, the same weightand the same angular velocity. As shown, diskrotates around its mass center; diskrotates around a fixed axis on its edge; diskrotates with slipping on a horizontal surface. If the momenta of the three disks are,and, respectively, then

A、

B、

C、

D、

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第8题

A homogeneous disk with mass M and radius R is rotating around an axis passing through point O. The angular momentum of the disk about this axis should be

A、

B、

C、

D、

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第9题

A homogeneous disk with mass M and radius R is rotating without slipping along an inclined plane. The velocity of the disk center is V. The angular momentum of the disk about the its contact point C with the plane should be

A、

B、

C、

D、

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第10题

The two homogeneous rings in Figs. (a) and (d) and the two homogeneous disks in Figs. (b) and (c) have the same weightand radius. Forceis applied in Figs. (a) and (b). A momentis applied in Fig. (c). A block with weightis suspended in Fig. (d). Which statement is correct?

A、The angular acceleration of the ring in Fig. (a) is equal to that of the disk in Fig. (b).

B、The angular acceleration of the ring in Fig. (a) is equal to that of the disk in Fig. (c).

C、The angular acceleration of the ring in Fig. (a) is equal to that of the ring in Fig. (d).

D、The angular acceleration of the disk in Fig. (b) is equal to that of the ring in Fig. (d).

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