题干

为了测量某石块的密度,某学校物理兴趣活动小组的同学利用一只小玻璃杯、一个量筒和适量的水做了如下实验:

在量筒内倒入60cm3的水;

①将小玻璃杯开口向上漂浮在量筒内的水面上

(如图甲所示),此时水面与84cm3刻线相平;

②将石块放入小玻璃杯中,让小玻璃杯漂浮在

量筒内的水面上(如图乙所示),此时水面与100cm3刻线相平;

③取出小玻璃杯,将石块沉没在量筒内的水中(如图丙所示),此时水面与64cm3刻线相平.根据以上数据可知,小玻璃杯的质量为____kg;石块的体积是____m3;石块的密度是____kg/m3

上一题 下一题 0.0难度 选择题 更新时间:2016-09-18 12:22:08

答案(点此获取答案解析)

0.024,4×10-6,4000

同类题5

   DIY, which means Do It Yourself, is quite popular in UK. Lots of stores and supermarkets sell DIY things. TV programs show people how to DIY.
   English people like DIY. There is a saying in UK---“An Englishman’s home is his castle”. Huge numbers of people spend their holidays making their homes beautiful “castles”. If there is anything that needs fixing around their houses, such as painting the walls or putting in a new shower, they will do the jobs themselves. They share DIY experiences with their friends. More and more people have discovered the joy of DIY. Sometimes people also DIY for saving money. With the economic downturn at present, many people can not afford to buy a bigger house. They are looking at how they can make their houses better without spending a lot of money. It is not surprising that DIY is so popular.
   DIY can be difficult. There is a huge market for DIY furniture which people need to put together themselves with a few basic(基本的) tools (工具). However, people often find it not easy to build a piece of furniture because they can’t understand the instructions. Sometimes the instructions are simple and clear, but the furniture itself is difficult to build. One thing is for sure, though most DIY projects are started with the best intentions (目的,意图), many of them may not get finished. DIY can also be dangerous. For example, anything electrical should be done by a professional worker. Unluckily, many people don’t care about this warning and put themselves in danger. It is reported that in just one year over 230 000 people were hurt while doing DIY in UK, including 41 000 who fell off ladders (梯子).
Therefore, DIY can bring us fun and help us save money, but it is not always as easy as it is thought to be if we bite off more than we can chew. Maybe factories should make products that are easier and safer for us to DIY.