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提问人：网友jimohaoliang 发布时间：2022-01-07

[主观题]

A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the ro

tation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher’s hand to produce the angular acceleration？

A、1.1 N？m

B、11 N？m

C、7.2 N？m

D、1.4 N？m

E、14 N？m

F、3.4 N？m

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更多“A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the ro”相关的问题

第1题

At its heart, psycholinguistic work consists of two questions. One is, What knowledge of l

anguage is needed for us to use language？ In a sense, we must know a language to use it, but we are not always fully aware of this knowledge. A distinction may be drawn between tacit knowledge and explicit knowledge. Tacit knowledge refers to the knowledge of how to perform. various acts, whereas explicit knowledge refers to the knowledge of the processes or mechanisms used in these acts. We sometimes know how to do something without knowing how we do it. For instance, a baseball pitcher(投手)might know how to throw a baseball 90 miles an hour but might have little or no explicit knowledge of the muscle groups that are involved in this act. Similarly, we may distinguish between knowing how to speak and knowing what processes are involved in producing speech. Generally speaking, much of our linguistic knowledge is tacit rather than explicit.

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第2题

Which of the following would be most analogous to the process of dampening oscillations de

scribed in the paragraph？

A．During a rainstorm, water rises to the level of a sewer drain, siphoning off and thus remaining at constant level.

B．A rubber ball which bounces off the ground multiple times, than gradually comes to rest.

C．A meteor hurtles through space indefinitely, due to the laws of inertia.

D．A clothing iron is left on, then becomes so hot that it catches on fire, burning its own cord and destroying its power source.

E．A baseball pitcher knows he tends to through to the left of home plate, and then in trying to throw to the right, overcorrects.

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第3题

Which of the following would be most analogous to the process of dampening oscillations de

scribed in the paragraph？

A．During a rainstorm, water rises to the level of a sewer drain, siphoning off and thus remaining at constant level.

B．A rubber ball which bounces off the ground multiple times, than gradually comes to rest.

C．A meteor hurtles through space indefinitely, due to the laws of inertia.

D．A clothing iron is left on, then becomes so hot that it catches on fire, burning its own cord and destroying its power source.

E．A baseball pitcher knows he tends to through to the left of home plate, and then in trying to throw to the right, overcorrects.

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第4题

There are people in Italy who can't stand soccer. Not all Canadians love hockey. A similar

situation exists in America, where there are those individuals-you may be one of them-who yawn(打呵欠) or even frown when somebody mentions baseball. (78) Baseball to them means boring hours watching grown men in funny fight outfits standing around in a field staring away while very little of anything happens. They tell you it's a game better suited to the 19th century-slow, quiet, gentlemanly. These are the same people who love football because it's a sport that glorifies "the hit".

By contrast, baseball seems abstract, cool, silent, still.

On TV, baseball game is fractured into a dozen perspectives, replays, close ups. The geometry of the game, however, is essential to understanding it. You should contemplate the game from one point as a painter does his subject; you may, of course, project yourself into the game. It is in this projection that the game affords so much space and time for involvement. The TV won't do it for you.

Take, for example, the third baseman. You sit behind the third base dugout and you watch him watching home plate. His legs are apart, knees flexed. His arms hang loose. He does a lot of this. The skeptic still cannot think of any other sports so still, so passive. But watch what happens every time the pitcher throws: the third baseman goes up on his toes, flexes his arms or brings the glove to a point in front of him, takes a step fight or left, backward or forward, perhaps he glances across the field to check his first baseman's position. Suppose the pitch is a ball. "Nothing happened," you say. "I could have had my eyes closed."

The innocent must play the game. And this involvement in the stands is no more intellectual than listening to music is. Watch the third baseman. (79) Smooth the dirt in front of you with one foot; smooth the pocket in your glove; watch the eyes of the batter, the speed of the bat the sound of horsehide on wood. If football is a symphony of movement and theatre, baseball is chamber music, a spacious interlocking of notes, chores and responses.

The passage is mainly concerned with ______ .

A．the different tastes of people for sports

B．the different characteristics of sports

C．the attraction of football

D．the attraction of baseball

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第5题

SECTION BINTERVIEWDirections: In this section you will hear everything ONCE ONLY. Listen c

SECTION B INTERVIEW

Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.

Now listen to the interview.

听力原文：INTERVIEWER: On the matter of careers, a lot of the jobs that people go into are sort of lifetime careers. What about baseball？ Is it a full life-time career？

MIKE: It's been—I mean, it's been my life so far, you know. I know someday—could be tomorrow—that I'm going to be out of it.

INTERVIEWER: But how long can you really expect to... to play, let's say, actively？

MIKE: Well, I think I've set goals, and I made my first goal, which was to make it to the big leagues. And now, my next goal is to make it through four years... to get my pension. And after that, everything is...

INTERVIEWER: But how many years can you expect to play professional ball？

MIKE: It's...I'm a pitcher, and it's difficult, as a pitcher to really say how many years... because you never know whether you're going to have a sore arm, whether it's going to go on you or what the problem may be. But as a pitcher, I guess the prime—I'm 24 years old now, and this is my sixth year—and the prime time for a pitcher is 27 to 30.

INTERVIEWER: Well, is there any problem with a sort of feeling of insecurity？

MIKE: Yeah, there is, especially, like I said—my first year. I disciplined myself, and I worked hard—and that's what got me here. And I realize that I have to work hard to stay here. And there is the insecurity.

INTERVIEWER: You're under contract？

MIKE: Right, I'm under contract. But that doesn't necessarily—I mean, they could send me down tomorrow. They could do whatever they wanted with me.

INTERVIEWER: What does it take to play professionally？ I'm thinking about the skill. Is it something that you just work hard to get, or is there a natural sort of ability？

MIKE: Well, there's people that have the natural ability, you know. I feel like I didn't have.

INTERVIEWER: So, you think there is something natural... a natural ability.

MIKE: There's a natural ability.

INTERVIEWER: I mean, just working hard isn't enough.

MIKE: I think that's what got me here. I really do. I know there was bad times and then— at one time in this organization, I was a suspect instead of a prospect. And I was told that.

INTERVIEWER: Well, what about the... on the personal side？ What's the schedule like for a... for a professional baseball player？ Is it full time around the year, or... ？

MIKE: No.

INTERVIEWER: Are there some seasons... ？

MIKE: Well, it depends. Like last winter, after the season was over, I got a phone call from a team in Obregon, Mexico, and they asked me if I wanted to go down and play winter ball down there. So, I...

INTERVIEWER: Hmm.

MIKE: I thought, well it'd be a good chance because there's a lot of big league ball players down there, and I'll get a chance to face big league hitting, so I decided to go down there. And I think it helped me.

INTERVIEWER: How long does the season last here？

MIKE: Okay. This season lasts from April... let's see, April sixth until October second— depending on whether or not you're going to be in the playoffs, and then it runs till, like, October sixteenth, or something like that.

INTERVIEWER: So, you then went to Mexico.

MIKE: Right.

INTERVIEWER: Well, when kids play baseball, it's kind of mostly for fun. Is it still the

same when you're a professional ？

MIKE:It's always fun when you're winning, and right now, you know, we're having our tough time, but I mean, I still enjoy going out every day, and running, and throwing. INTERVIEWER: What's the main attraction, would you say？ Uh... because you're doing exactly what you want to do？

MIKE: I think that's the big thing.

INTERV

A．agrees

B．disapproves

C．hopes

D．doubts

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第6题

Section BDirections: There are 2 passages in this section. Each passage is followed by som

Section B

Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.

There are people in Italy who can't stand soccer. Not all Canadians love hockey. A similar situation exists in America, where there are those individuals you may be one of them who yawn or even frown when somebody mentions baseball. Baseball to them means boring hours watching grown men in funny tight outfits standing around in a field staring away while very little of anything happens. They tell you it's a game better suited to the 19th century, slow, quiet, gentlemanly. These are the same people you may be one of them who love football because there's the sport that glorifies "the hit".

By contrast, baseball seems abstract, cool, silent, still. On TV the game is fractured into a dozen perspectives, replays, close-ups. The geometry of the game, however, is essential to understanding it. You will contemplate the game from one point as a painter does his subjects; you may, of course, project yourself into the game. It is in this projection that the game affords so much space and time for involvement. The TV won't do it for you.

Take, for example, the third baseman. You sit behind the third base dugout and you watch him watching home plate. His legs are apart, knees flexed. His arms hang loose. He does a lot of this. The skeptic still cannot think of any other sports so still, so passive. But watch what happens every time the pitcher throws; the third baseman goes up on his toes, flexes his arms or brings the glove to a point in front of him, takes a step right or left, backward or forward, perhaps he glances across the field to check his first baseman's position. Suppose the pitch is a ball. "Nothing happened," you say, "I could have had my eyes closed."

The skeptic and the innocent must play the game. And this involvement in the stands is no more intellectual than listening to music is. Watch the third baseman. Smooth the dirt in front of you with one foot; smooth the pocket in your glove; watch the eyes of the batter, the speed of the bat, the sound of horsehide on wood. If football is a symphony of movement and theatre, baseball is chamber music, a spacious interlocking of notes, chorus and responses.

The passage is mainly concerned with ______.

A．the different tastes of people for sports

B．the different characteristics of sports

C．the attraction of football

D．the attraction of baseball

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第7题

When I was a little boy, I really liked my older brother, Tom. He was the best pitcher （投

When I was a little boy, I really liked my older brother, Tom. He was the best pitcher (投手) on his baseball team, the Dreams. I always played catch (接球) with Tom. He threw so fast that I couldn't often catch the ball. He always asked me, "Have you had enough yet, Mark？" But I said I wanted to play more. I wanted to be a good player like Tom.

When I was ten years old, I joined a team, the Stars. I didn't join the Dreams because my friends on the Stars wanted me to join them. I practiced very hard with my team every Saturday afternoon. The next summer came, my team was going to play against the Dreams. I thought, "I want to hit Tom's basketball, but it will be too fast for me to hit." I practiced hitting basket- balls harder than before. I talked with Tom about the game. He said, "With my basketball, my team is going to win."

One Saturday afternoon we had the game. It began at 1: 00. Mother came to watch us. No one could hit Tom's basketball. The game was coming to its end. My last chance came. I had to hit his basketball.

"Strike one," called the umpire (裁判员). "Oh, that's fast!" I thought. Tom looked great.

He threw again, but I couldn't hit that one, either. "Hit the next ball. Mark," the players on my team shouted. I thought, "How can I do that？ No one has hit his basketball since the game began. But I have to hit it for our team."

Tom threw again. It was another basketball. I kept my eyes on it. This time I was able to hit it! I watched the ball in the sky and started to run. A player on the Dreams ran fast to try to catch it, but he couldn't. I was safe! Everyone on my team shouted, "You did it!" I was very happy. But when I saw Tom, I could't be happy any more. He was watching me. He didn't look happy.

The next player on my team didn't hit Tom's basketball. That was the end of the game. The Dreams won.

After the game I went to Tom, but I didn't know what to say to him. He said to me with a smile, "You hit my basketball very well." I said, "Thank you." Tom said to me, "You hit my basketball today, but next time it will be much faster. O. K.？" I answered him with a smile, "Yes, I'll practice much harder, Tom." Mother listened to us and said, "Tom and Mark, you both did a very good job." She looked very happy.

Which of the following is TRUE？

A．Tom was the best pitcher on the Stars.

B．Mark was the best pitcher on the Dreams.

C．Tom thought that his team would win.

D．Mark was sure that he could hit Tom's basketball.

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第8题

Experienced baseball fielders can tell how far a ball is going to travel just by listening

to the crack of the bat. If they didn't, they wouldn't stand a chance of catching it, claims a physicist in New York.

"When a baseball is hit straight at an outfielder, he cannot quickly judge the angle of the scent and the distance the ball will travel," says Robert Adair, a physicist at Yale University. If he relied purely upon visual information, the fielder would have to wait for about one-and-a-half seconds before he could tell accurately if the pitcher hit the ball long or short. By this time the ball may have travelled too far for him to reach it in time.

To stand a fighting chance of catching it, according to Adair, fielders must listen to the sound the ball hitting the bat to judge how far it will travel. There is anecdotal evidence to support this, he says. A former centre fielder told Adair: "If I heard a crack I ran out, if I heard a clunk, I ran in."

To test his hypothesis, Adair calculated how quickly a fielder could change direction if he had misjudged whether the ball was going long or short. The difference between the "crack" and "clunk” can he explained by how well the batter has hit the ball, and could mean a difference in running distance of as much as 30 metres, he told delegates at a meeting of the Acoustical Society of America in Chicago last week.

Scientists already knew that to hit a ball long the batter must strike it somewhere near the vibrational node of the bat, known as the sweet spot. Balls hit on the sweet spot generate fewer energy-sapping vibrations in the bat, allowing greater energy transfer to the ball. Conversely, mishit balls make the bat vibrate strongly and so do not travel as far.

Adair is quick to point out that this only applies to wooden bats, which are used in major league baseball. Aluminum bats, on the other hand, tend to produce a fairly uniform. "ping” sound regardless of where you hit them.

According to Robert Adair, why can't an outfielder rely purely on visual information？

A．Because it may take longer time for him to exert judgment.

B．Because the ball may change directions during flight.

C．Because the ball may be hit either long or short.

D．Because light travels faster than sound.

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第9题

How old was the man when he began to play as a pitcher？A．27.B．30.C．24.D．18.

How old was the man when he began to play as a pitcher？

A．27.

B．30.

C．24.

D．18.

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第10题

Chinese tea ceremony is a complicated process. The tea sets are delicate. They are _______________.

A、tea pot

B、tea brush

C、tea filter

D、tea pitcher

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