问题 选择题

AB是某电场中的一条电场线,若将一负电荷从A处自由释放,负电荷沿电场线从A到B运动过程中的速度图像如右图所示,比较A、B两点电势的高低和场强的大小,下列说法正确的是            (   )

A.A>B,EA>EB    B.A>B,,EA<EB

C.A<B,EA>E    D.A<B,EA<EB

答案

答案:C

这个题目是典型的带电粒子在电场中的加速运动

考查知识点:加速度、电势、电场强度

思路分析:先分析速度时间图像,得出运动规律,在分析电场强度、电势的关系

具体解答过程:由速度时间图像可知,负电荷做加速度逐渐减小的加速运动,由a知道EA>EB,从A运动到B,可知电场力向右,电场强度向左,A<B,则可得出正确选项。

试题点评:要求学生把牛顿第二定律、受力分析等相关知识运用到粒子在电场中的运动中。

单项选择题

Gardens of Claude Monet in Giverny Flowers, color, and light are essential elements in interior decorating. And nowhere are these more evident than in the home and gardens of Claude Monet in Giverny, France. Filled with the bright, clear colors of nature, this home is a must-see for anyone who loves art, flowers, color, or decorating. It is especially remarkable because the usual decorating of the day included heavy curtains, large velvet upholstered pieces, and dark, somber interiors. Monet broke from that tradition when he moved here in 1883, enchanted by the quiet village of Vernon, rolling country hills, pretty trees and fields all laid out gracefully along the banks of the Este River. Monet was still a struggling artist when he arrived in Giverny. It was one of his paintings that had given this new arts movement its name-"Impressionism"-for the use of dabs of color on canvas, rather than sweeping brushstrokes or more classic painstaking detail. While at first reviled by critics impressionism began to grow in popularity and buy 1890 Monet’s art was selling well enough that he could afford to purchase his rented home for the price of 22,000 francs, equal to the price of just two or three of his paintings. He stayed in this home for the rest of his life, until 1926. Monet’s love of pure color is fully expressed in the decoration of his home. Outside, bright pink stucco walls contrast with forest green shutters. Inside, brilliant yellow hues brighten the dining room while lovely watery blues and greens grace the entry. In the kitchen two tones of blue burst into a riot of color, highlighted with copper pots and blue and white tiles from Rouen. On display in the dining room is the matching yellow china wares filled with a collection of blue and white china pieces as well as the yellow and blue banded dinnerware he had commissioned in his own design. In the center, a large table is set for the family and guests. A pretty fireplace at the end of the room shows off blue and white tiles under a mantle decorated simply with an arrangement of bottle green vases. Japanese prints cover the walls. The home is one room deep and about five rooms wide, each with windows overlooking the magnificent gardens where great care was taken in the planning and planting. Monet eventually expanded his land to include a small stream, pond, and water lily gardens on an adjacent properly. At one point he employed a staff of six gardeners to care for the grounds and keep the gar-dens supplied with flowering blooms. It is the gardens that seem to be the focal point of the home. Laid out in neat rows, with paths, archways, and color, Monet oversaw every de- tail. Strolling through them, one almost expects to come upon the scene of Monet paining, his wife and a child in front of his magnificent rose garden. Join us for a beautiful photo tour of Monet’s gardens.

In the sentence "Monet was still a struggling artist when he arrived in Giverny" (Para- graph 2), the underlined word "struggling" means ______.

A.brave

B.both poor and unknown

C.famous

D.rich

单项选择题 A1/A2型题