1)An airplane is flying with a velocity of 231 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.54 km, a flare is released from the plane. The flare hits the target on the ground. What is angle θ?
2) soccer ball is kicked from the ground. When it reaches a height of 5.26m, the velocity is v=[5.15i+7.27 j]m/s.
a)Determine the maximum height that the ball reaches.
b)Determine the total horizontal distance travelled by the ball.
c)What is the speed of the soccer ball just before it hits the ground?
3)A ball rolls off of a 1.50m high table. The ball hits the floor 1.50m away from the foot of the table.
a)How long did it take the ball to hit the ground?
b)Determine was the ball's initial speed when it first left the table?1 個解答其他 - 科學7 年前
As time progresses, people are continuing todevelop new technology and devices for people to use. They make life easier. Ithink the motor vehicle is a good example of this. Vehicles are of many types,such as the bus, cab, car, train. I think the car is the best of all vehicles.There are three things that prove my thesis is correct. Firstly, I can drive mycar everywhere that I like. Secondly, I regard sitting in my own car as morecomfortable than sitting in a public vehicle. Lastly, I believe that publictransport fees are more expensive than the gasoline cost. Let me explain themone by one.First of all, I can drive my car everywherethat I like. As public transport cannot take me to everywhere, it is veryinconvenient for me. People may say that I can take a taxi, but it is veryexpensive for me to do so. If I take a taxi, I need to pay about $20 for oneway. Moreover, when I feel bored at midnight, I can take a joyride. There willnot be any public transport services at midnight. Therefore, I believe aprivate car is the best.Secondly, I regard sitting in my own car asmore comfortable and safe than sitting in public transportation. The seat in mycar is wider than public transport seating. There is a excellent safetyequipment in my car. For example, there are seat belts in my car. There is asafety bubble cushion that prevents my head getting hurt in an accident. On theother hand, there are no seat belts on the bus. The seats on the bus are verytight. I do not have enough space to move. Therefore, I believe a private caris the best.2 個解答語言9 年前
As we are human being,we must tried to guide by our conscience when we ae facing a question.
There was a question that I need to guide my conscience.That is I don't want to go to scholll in recent days.As you know that it is so cold in Winter time and my homestay is far away from the school and also the bus stop.Every day morning,I feel very cold and I don't want to leave my bed,I just want to stay there and sleep .
In this moment,my angle and deathful will pop up.'Cherry,you must wake up,if you don't go to school,ypu will miss a lot of lessons ,your parent will punish you and your teacher will think that you are a bad student because of this,'my angel said.But my deathful must said Cherry,don't worry.Just one day you don't go to school,you won't miss a lot of things.You want to sleep more,right?Then just sleep.
Finally, I woke up and I went to school.As I don't want to miss some lessons and I will in trouble if my parents know that.I started thinking why I have this idea.I have never tried to think "don't go to school',but why I have this idea,beacuse of the weather.I think I am too bad,as if you are a student ,you must never have this kinds of ideas.I promise myself I must go to school everyday.2 個解答語言10 年前
1)For elements in the main groups:
-Period number of an element
=number of occupied electron shells in an atom of the element
-Group number of an element
=number of outermost shell electrons in an atom of the element
2)Elements within the same group of the Periodic Table have the same number of outermost shell electrons in their atoms,therefore they have similar chemical properties.However,there is a gradual change in reactivity down a group.
3)Chemical properties of an unfamiliar element can be predicted from its position in the Periodic Table.
我唔係好明講咩...最好可以詳細咁解釋...thanks1 個解答化學1 十年前
內地人士設法維權，官方致力維穩，維權不敵維穩，主要是執法不公，法律為政治服務；香港實行「一國兩制」，獨立公正的法律和司法體制是香港的優勢，也是香港維持繁榮穩定之所賴。三鹿毒奶粉案受害者家長不辭跋涉來港申索，突顯了香港法治制度的吸引力，如果內地人士維權創下成功先例，則香港的法制、法治輻射內地，這大概超逾了當年鄧小平構思「一國兩制」時的想像，可以理解為「一國兩制」具有生命力的事例。2 個解答公民參與1 十年前
After I watched this movie,I think the company are so selfish,it is because the company only thinking of how much they can earn,they do not thinking of the quality of the food and waht will happen if the people eat the food which have problem.
Beside that,it is horrible for me to know that the factories which produce food are so dirty when they are making the food.Also,the factories also change the DNA of the food,and it is not good for human body,but the speaker of the company said that it is not problem,are people problem,because if people do not buy the produce from us,they will not get sick.I think it is not a responsible answer.
Lastly,I think the government should do something to control the qulity of the food.I will choose the food produce carefully in the future.2 個解答語言1 十年前
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E F G A D D C D C C C D E G E1 個解答其他 - 電視1 十年前
help me to translate(日to中)1 個解答語言1 十年前