您所在的当前位置：初中物理试题 >

压强的计算

> 小军体重500N，他的家距离学校2400 m，他骑自行车在水平路面上匀速直线行驶10min到校。有关数据如表中列出：求：（1）行驶过程中，车对地面的压强是多大？（2）小军骑自行车上学一程至少要做多少功？（3）小军骑车的功率是多大？

问题：

发布时间：2024-09-11

小军体重500N，他的家距离学校2400 m，他骑自行车在水平路面上匀速直线行驶10min到校。有关数据如表中列出：求：
（1）行驶过程中，车对地面的压强是多大？
（2）小军骑自行车上学一程至少要做多少功？
（3）小军骑车的功率是多大？

参考答案：

提问用户：Cr***N9l

可能感兴趣的题目：

1 “有心杀贼，无力回天，死得其所，快哉！快哉！”这句话是维新志士康有为临刑前说的，表达了他“甘为变法流血牺牲”的精神。
2 只有合理使用物质，才能使物质造福人类。三聚氰胺（C 3N 6H 6）有很多用途：制作环保阻燃剂、化肥等。（1）1个C 3N 6H 6分子中共有个原子。（2）C 3N 6H 6中碳元素与氮元素的质量比为。（3）C 3N 6H 6中氮元素的质量分数为。（保留一位小数）
3 右图是NaOH溶液与稀盐酸恰好完全反应的微观示意图，由此得到的结论不正确的是 A．反应结束时溶液的pH="7" B．NaOH溶液中存在的粒子是Na+和OH- C．该反应的实质是H+和OH-结合生成H2O分子 D．若两者恰好完全反应，所得溶液中溶质的质量分数为11.7%，则此溶液中钠离子与水分子的个数比为36：883
4 Mr. Brown was going away for a week. Before he left, he said to his son, "If anyone asks for me, you can tell him that your father has been out for doing something, and will be back in a week, then be sure to ask him to sit down for a cup of tea." "OK, Dad," said his son. But he was afraid his son couldn"t remember this, he wrote these words down on a piece of paper and gave it to him. His son put it into his small pocket, took it out and looked at it every now and then. Four days passed, but no one came to see his father. The boy thought that there was no man to come and that the piece of paper was of no more use for him, so he burnt it that evening. The next afternoon, someone knocked at the door. The boy opened it. A man was standing at the door and said, "Where is your father?" The boy put his hand into his pocket at once and looked for the piece of paper. He could not find it. He suddenly remembered he had burnt it, so he shouted, "No more." The man was very surprised. He asked, "No more? I met your father last week. When did it happen?" "Burnt yesterday evening." 小题1:Mr. Brown told his son that _____. A．he would be away from home for four days B．he would be back in seven days C．he would be back in a month D．he liked a cup of tea 小题2:Mr. Brown wrote the words down on ________. A．the wall B．the door C．a piece of paper D．his son"s pocket 小题3:A man came to visit the boy"s father on ________. A．the second day B．the third day C．the fourth day D．the fifth day 小题4:The man was very surprised because _________. A．he thought the child"s father was dead B．the child didn"t ask him to sit down C．the child gave him a cup of tea D．he couldn"t find that piece of paper 小题5:What was burnt? ___________. A．The piece of paper B．Mr. Smith C．The visitor D．The boy
5 计算： a2-1 a+2 - 1-a a+2 =______．
6 胡蝶同学设计了一个演示实验．在磨砂玻璃下放一张投影片，再放在投影仪上，无论怎样调节也看不到投影片清晰的像，这是由于光在磨砂玻璃上发生了______．当在磨砂玻璃上加些水，磨砂玻璃又变得透明，这时在屏幕上可以看见一个______像．由于水不断______，像又慢慢变模糊了，这一过程中水要______热．这个演示把不能直接观察到的______现象转变成看得见的．
7 一滴水可以折射出太阳的光辉，小小的选票记录着我国民主建设的进程。珍视民主权利，投出庄严而神圣的一票 [ ] ①它为民主法制建设增添新的血液 ②为建设社会主义政治文明增加新的活力 ③是推进社会主义民主建设的具体行动 ④能使人民的愿望得到充分表达，人民的呼声和要求得到有效传递 A．①②③ B．①②④ C．②③④ D．①②③④
8 图所示，“6V 3W”的小灯泡L与额定功率为10W的电阻器R串联，电源电压大小为10V，且保持不变，闭合电键S后，电流表、电压表示数分别为0.2A和2.4V，不考虑电阻器和小灯泡电阻随温度的变化，求：（1）电阻器R 的阻值。（2）整个电路消耗的实际功率。王刚同学的求解如下：（1）根据欧姆定律，电阻器的电阻（2）因为整个电路只有小灯泡L和电阻器R两个用电器，所以整个电路消耗的电功率：。请你指出王刚同学求解过程中存在的错误，并给出正确的解答来。
9 写出下列文学作品中典型形象的典型意义（代名词）： ①_____________：奥楚蔑洛夫（《变色龙》） ②_____________：葛朗台（巴尔扎克《欧也妮·葛朗台》） ③_____________：阿Q（鲁迅《阿Q正传》） ④_____________：堂吉诃德（塞万提斯《堂吉诃德》） ⑤_____________：哈姆雷特（莎士比亚《哈姆雷特》）
10 设 a=(3- 2 )0，b=（-3） 2， c= 3 -27 ， d=(- 1 2 )-2，则a，b，c，d按由小到大的顺序排列正确的是（　　） A．c＜a＜d＜b B．b＜d＜a＜c C．a＜c＜d＜b D．b＜c＜a＜d