问题 选择题

如图(a)所示,两个平行金属板P、Q竖直放置,两板间加上如图(b)表示的电压.t=0时,Q板比P板电势高5V,此时在两板的正中央M点有一个电子,速度为零,电子在电场力作用下运动.使得电子的位置和速度随时间变化.假设电子始终未与两板相碰,在0<t<8×10-10s的时间内,这个电子处于M点的右侧,速度方向向左且大小逐渐减小的时间是(  )

A.6×10-10s<t<8×10-10s

B.4×10-10s<t<6×10-10s

C.2×10-10s<t<4×10-10s

D.0<t<2×10-10s

答案

在0<t<2×10-10s时间内,Q板比P板电势高5V,E=

U
d
,方向水平向左,所以电子所受电场力方向向右,

加速度方向也向右,所以电子向右做匀加速直线运动;

在2×10-10s<t<4×10-10s时间内,Q板比P板电势低5V,电场强度方向水平向右,所以电子所受电场力方向向左,加速度方向也向左,所以电子向右做匀减速直线运动,当t=4×10-10s时速度为零;

在4×10-10s<t<6×10-10s时间内,Q板比P板电势低5V,电场强度方向水平向右,所以电子所受电场力方向向左,加速度方向也向左,所以电子向左做匀加速直线运动;

在6×10-10s<t<8×10-10s时间内,Q板比P板电势高5V,电场强度方向水平向左,所以电子所受电场力方向向左,加速度方向也向左,所以电子向左做匀减速直线运动,到8×10-10s时刻速度为零,恰好又回到M点.

综上分析可知:在6×10-10s<t<8×10-10s时间内,这个电子处于M点的右侧,速度方向向左且大小逐渐减小.

故选A

阅读理解

Have you ever walked outside thinking it was one temperature but quickly discovered it felt colder? That is because of the “wind chill” effect.

Wind chill is how cold people and animals feel when they are outside, not the actual temperature on the thermometer(温度计). It is based on how quickly your body loses heat when it is exposed to wind and cold. When the wind is strong, your body quickly loses heat, making the temperature of your skin drop.

When scientists first started calculating wind chill, they used research conducted in 1945 by explorers to Antarctica who measured how quickly water froze outside.

But water freezes faster than exposed skin, so the wind chill index based on that data wasn’t accurate.

In 2001, the US government began to measure wind chill more precisely by testing how quickly people’s skin froze.

Twelve volunteers were placed in a chilled wind tunnel. Equipment was stuck to their faces to measure the heat flow from their cheeks, forehead, nose and chin while they walked three miles per hour on a treadmill(跑步机).

The experiment revealed how quickly exposed skin can be damaged, particularly unprotected areas like your fingers, toes, the tip of your nose and your ear lobes. In fact, 40 percent of your body heat can be lost through your head! Signs you might have frostbite(冻疮) are when the skin turns white or pale and you lose feeling in that area.

The information collected from the volunteers helped scientists work out the math to compute wind chill. It involves wind speed and air temperature.

If, for example, the temperature outside is zero degrees Fahrenheit and the wind is blowing at 15 miles per hour, the wind chill is calculated at 19 degrees below zero. At that wind chill temperature, exposed skin can freeze in 30 minutes.

You can find a calculation table at www.nws.noaa.gov/om/windchill/index.shtml.

Experts advise in cold weather that you wear loose-fitting, lightweight, warm clothing, worn on top of each other. Air caught between the clothes will keep you warm. The best cold-weather coats have head coverings made of woven material that keep out water. So next time the temperature drops and you want to play outside, listen to your parents when they tell you to wrap up warm!

小题1: According to the text, wind chill _______.

A.means how fast exposed skin freezes

B.doesn’t affect your head as much as other body parts

C.changes according to the temperature on the thermometer

D.changes from person to person depending on their health小题2: When might a person have frostbite according to the passage?

A.When his skin turns red and he loses feeling in that area.

B.When he is running faster and he is losing strength quickly.

C.When his face is exposed and quickly loses heat even indoors.

D.When his skin turns pale and he has no feeling in that area.小题3: What factors influence wind chill?

A.A person’s body temperature and will speed.

B.Wind speed and a person’s strength.

C.Air temperature and wind speed.

D.The location and air temperature.小题4: What can we conclude from the passage?

A.It was in 1945 that scientists first began to calculate wind chill.

B.Compared with water, people’s exposed skin freezes more slowly.

C.The wind chill index based on Antarctica data is considered a standard.

D.With the development of technology, many previous researches have been proven wrong.

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