Đơn Vị Nào Sau đây Không Phải Là đơn Vị Của Công Suất

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 Đơn vị nào sau đây không phải là đơn vị của công suất ? A. HP                 B. kw. h                C. Nm/s                D. J/s Đáp án và lời giải Đáp án:B

Câu hỏi thuộc đề thi sau. Bạn có muốn thi thử?

Bài tập trắc nghiệm 15 phút Công và công suất - Định luật bảo toàn - Vật Lý 10 - Đề số 12

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Một số câu hỏi khác cùng bài thi.

• Cho một vật có khối lượng 2kg rơi tự do. Tính công của trọng lực trong giây thứ năm. Lấy g = 10m/s2.

• Cho một vật có khối lượng 8kg rơi tự do. Tính công của trọng lực trong giây thứ tư. Lấy g = 10m/s

• Một người kéo một hòm gỗ khối lượng 80kg trượt trên sàn nhà bằng một dây có phương hợp góc 600 so với phương ngang. Lực tác dụng lên dây bằng 100 N. Công của lực đó khi hòm trượt đi được 10m là
• Công suất được xác định bằng

• 1 Mã lực (HP) có giá trị bằng:

•  Đơn vị nào sau đây không phải là đơn vị của công suất ?
• Chọn đáp án đúng nhất. Công có thể biểu thị bằng tích của:

• Một người nhấc một vật có m = 2kg lên độ cao 2m rồi mang vật đi ngang được một độ dời l0m. Công tổng cộng mà người đã thực hiện là bao nhiêu? Lấy g = 10m/s2

• Một người thực hiện một công 3000 J để đẩy một thùng có khối lượng 150 kg đi 20 m trên mặt sàn nhẵn nằm ngang. Lực đẩy ngang của người này bằng:

• Một ô tô có công suất của động cơ 100kW đang chạy trên đường với vận tốc 72 km/h. Lực kéo của động cơ lúc đó là:

Một số câu hỏi khác có thể bạn quan tâm.

• Read the passage and choose A, B, C or D to complete each blank. Hue FestivalHue Festival is a big cultural event of Hue City that is held every two years. It is the (27) _______ to honor cultural and historical values of that Vietnam’s former capital city. The first Hue Festival (28) _______place in 2000.At the beginning of Hue Festival, visitors can enjoy (29) _______ colorful and grand opening ceremony with unique (30) _______ of several art groups from Vietnam and other countries. During the festival, there is a variety (31) _______ cultural events such as Hue Poetry Festival, Massive Street Arts Performances, Art Exhibitions, the Week of Vietnam’s historical films. (32) _______, visitors can come and explore some traditional values of Vietnam at Gastronomy Quarters, Traditional  Kite Flying Festival (33) _______ watch “Ao dai” Grand Show, “Oriental night” Show, and sporting activities (34) _______ boat race, human chess, etc. Especially, many ancient scenery of Nguyen Dynasty are also reproduced (35) _______ provide tourists an insight into Vietnam’s feudal era.Hue Festival is well-known as an (36) _______ festival where cultures of many countries converge together as well as where Vietnamese traditional and cultural values are widely presented to the world.

  “Oriental night” Show, and sporting activities (34) _______ boat race, human chess, etc.

• Talking about your feeling can help you get clear about what you feel.

• Though she lost her job last month, she still wanted to save______so she said that she had left it willingly.

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29.

  The knock-on effect of volunteering on the lives of individuals can be profound. Voluntary work helps foster independence and imparts the ability to deal with different situations, often simultaneously, thus teaching people how to (25)______ their way through different systems. It therefore brings people into touch with the real world; and, hence, equips them for the future.

  Initially, young adults in their late teens might not seem to have the expertise or knowledge to impart to others that say a teacher or an agriculturalist or a nurse would have, (26) ______ they do have many skills that can help others. And in the absence of any particular talent, their energy and enthusiasm can be harnessed for the benefit (27) ______ their fellow human beings, and ultimately themselves. From all this, the gain to any community no matter how many volunteers are involved is (28) ______.

  Employers will generally look favorably on people (29) ______ have shown an ability to work as part of a team. It demonstrates a willingness to learn and an independent spirit, which would be desirable qualities in any employee.

  Điền vào ô 28.

• Hỗn hợp E gồm 3 peptit mạch hở: dipeptit X, tripeptit Y, tetrapeptit Z có tỉ lệ mol tương ứng là 1 : 1 : 2. Cho 1 lượng E phản ứng hoàn toàn với dung dịch NaOH dư thu được 0,06 mol muối của glyxin; 0,1 mol muối của alanin và 0,1 mol muối của valin. Mặt khác đốt cháy hoàn toàn m gam E thu được tổng khối lượng CO2, H2O là 112,28 gam. Giá trị của m là:

• Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks from 46 to 50.

  What make a good souvenir?

  On my desk at home, I have a collection of souvenirs; objects that remind me of places I‟ve visited and important events in my life. These objects include a model boat that I saw being carved from a piece of wood on a Caribbean island, a piece of lava that emerged hot from a volcano in the year I was born, and a shell (46) _____ on my favourite childhood beach.

  Unlike everything else, from which memory and detail fades, it is as if the longer you hold on to certain objects, the (47) ________ their associations with the past become, and the sharper the recollections that gather around them. They are, (48) ________, real souvenirs, encapsulations not only of the place, but of your time in the place. But these days, the term “real souvenirs” sounds like a contradiction in terms, and this is because the objects sold to tourists as souvenirs are often cheap mass-produced imports that have nothing to do with the place at all.

  It‟s often the (49) _____ that the best souvenirs, like my shell, are found rather than purchased, but browsing for souvenirs can also be a fun holiday activity. But if you are buying souvenirs on holiday this summer, make sure they (50) ________ the reality test. A good souvenir is not just made in the area where it is bought, it also says something about the culture of that area. It is something made by local people using sustainable local materials, and because you are effectively supporting the local economy, it shouldn‟t come too cheap, either.

  They are, (48) ________, real souvenirs, encapsulations not only of the place, but of your time in the place.

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35.

  Translators and interpreters for tech jobs of the future are expected to be one of the fastest growing occupations in the nation, according to a just released survey by Vietnamworks. Almost all positions for programmers, application developers, database and network administrators, engineers, designers, architects, scientists, technicians, and tech support will require bilingual or multilingual fluency.

  In just the last two years the demand for tech professionals with foreign language skills has increased more than two and one-half fold, said the survey, and the uptick shows no signs of abating anytime soon. Roughly 400,000 jobs are expected to open for interpreters (who focus on spoken language) and translators (who focus on written language) in the tech segment, between 2017 and 2020, says Tran Anh Tuan. Tuan, who works for the Centre for Forecasting Manpower Needs and Labour Market Information in Ho Chi Minh City doesn't include other industries in his prediction, which are also recruiting ferociously for more people with these same language skills.

  While that claim might seem a bit overblown (and amounts to little more than a guess by Tuan), it is clear that innovative technologies like robotics, 3D printing, drones, artificial intelligence and virtual reality will create major upheavals in all sorts of labor markets, not just technology over the next few years. In the last month alone, most every job posted on employment websites throughout Vietnam included the word bilingual. Far higher salaries go to people who work in high tech positions and can speak a foreign language such as English in addition to Vietnamese, says Tran Quang Anh from the Posts and Telecommunications Institute of Technology.

  Unfortunately, the surveys show that most graduating Vietnamese students are unable to do more than understand a few basic phrases of foreign languages, and practically none of them can speak any foreign language coherently, The good paying jobs with high salaries and benefits are only available to translators and interpreters who specialize in high tech jobs, says Anh. But it's not just English— graduates are needed with fluency in middle eastern languages like Arabic, Farsi and Pashto (Afghani) as well as German, Japanese and Korean to name just a few. Spanish is also in high demand in Vietnam, primarily because it is the second most common language in the US after English.

  A recent tech expo in Hanoi sponsored by Vietnamworks and the Navigos Group attracted nearly 4,000 young tech graduates and recruiters from 14 leading companies looking to fill job vacancies with skilled bilingual workers. The job applicants were young and industrious, said the recruiters. However, missing were candidates with the requisite language skills and most lacked basic 'soft skills' such as written and verbal communication abilities to effectively communicate even in their native Vietnamese language.

  Notably, the recruiters said they considered language abilities and soft skills just as, if not more important, than academic ability. Yet virtually all the prospective academically qualified employees lacked even the most basic of interpersonal communication abilities.

  What can be inferred from the passage?

• When finding a new house, parents  should___________all the conditions for their children’s education and entertainment.

• Read the following passage and mark the fetter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35.

  Facebook users spend an average of more than 15 hours a month on the social networking site. While there are plenty who caution against such intensive use — and there are a number of studies detailing the harm Facebook could potentially cause — there also are lots of reports extolling the site's virtues. As the social media giant prepares for its upcoming initial public offering, here are some ways Facebook just might be good for you.

  Spending time on Facebook can help people relax, slow down their heart rate and decrease stress levels, according to researchers from the Massachusetts Institute of Technology and the University of Milan. In a study published earlier this year, researchers studied 30 students and found that a natural high was sparked when they were on the social media network that led to the relaxed heart rates and lower levels of stress and tension. In the study, the students were monitored in three situations: looking at panoramic landscapes, performing complicated mathematical equations and using Facebook. While the first situation was the most relaxing to students and the math problems were the most stressful, the time on Facebook uncovered high levels of attractiveness and arousal. The findings support the researchers' hypothesis that Facebook's success, as well as that of other social media networks, correlates to the specific positive mental and physical state users experience.

  While many may argue that social media networks only distract employees, research shows the opposite may be true. Research from Keas.com found that a 10-minute Facebook break makes employees happier, healthier and more productive. The study examined workers in three groups: one that was allowed no breaks, one that was allowed to do anything but use the Internet and one that was allowed 10 minutes to use the Internet and Facebook. The Facebook group was found to be 16 percent more productive than the group that was not allowed to use the Internet and nearly 40 percent more productive than the group that was allowed no breaks. "Short and unobtrusive breaks, such as a quick surf on the Internet, enables the mind to rest itself, leading to a higher net total concentration for a day's work, and as a result, increased productivity," said Brent Coker of the department of management and marketing at the University of Melbourne in Australia.

  Facebook is also in the business of matchmaking. Research shows that nearly 60 percent of singles will friend someone new on Facebook after meeting them in person. If they like what they see, 25 percent are likely to contact their new love interest via Facebook. Once the courting is over, nearly 40 percent of those social networking adults will update their relationship status on Facebook, with just 24 percent telling their friends first. Facebook use between couples will continue through the dating process, the research shows. Throughout the day, 79 percent of couples said they send partners Facebook messages or chat on the social network. In addition, more than 60 percent would post romantic messages on their significant other's Facebook wall. When the relationship ends, more than half of those surveyed immediately update their status to single, which automatically sends out a notification to their friend list to start the dating cycle over again.

  Which of the following could best describe the tone of the passage?

• Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

  Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

  Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

  The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one

  and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.

  The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

  The word “intermittently” in paragraph 1 is closest in meaning to

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