题干

某小组同学做“探究容器底部受到液体压强和压力大小的规律”的实验.先向如图(a)所示三个底面积不同的圆柱形容器中分别注入等质量的水,测得容器底部受到水的压强值记录在表1中;换用酒精重复上述实验,并将数据记录在表2中.之后,他们又在如图(b)所示三个不同底面积的口大底小容器中注入等质量的水,重复上述实验,数据记录在表3中.(ρ酒精=0.8×103kg/m3

表1(注入水0.1kg)

实验

序号

深度(m)

容器底面积(cm2

容器底的压强(Pa)

1

0.01

100

100

2

0.02

50

200

3

0.05

20

500

表2(注入酒精0.08kg)

实验

序号

深度(m)

容器底面积(cm2

容器底的压强(Pa)

4

0.01

100

80

5

0.02

50

160

6

0.05

20

400

表3(注入水0.1kg)

实验

序号

深度(m)

容器底面积(cm2

容器底的压强(Pa)

7

0.01

80

100

8

0.02

40

200

9

0.05

15

500

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    Getting on the school bus, like the possible dangers around the home, getting on the school bus can also bring its own set of dangers. There are several important safety measures that parents should be aware of when it comes to bus safety.

    Parents should always make sure that someone is taking charge of children at the bus stop to make certain clear ground rules which are in place and are being followed—particularly rules that forbid horseplay in and around the street.

    Teach children to ask the bus driver for help in picking up anything they may have dropped around the bus, as children getting dropped articles are often hit by the bus or another vehicle because they are not seen by the bus driver or by oncoming traffic.

    Children should be asked to take five large steps away from the bus when they get it off, and make sure that the bus driver can see you and look you directly in the eyes to signal it is OK to cross the street. It is still very important that children also look both ways as they cross the street.

    Inform children that they must never speak to any stranger who talks with them first and that they must never accept a ride from any person unless their parents tell them directly that it is OK. Teach kids that adults should ask other adults for help, not kids. If an adult asks a kid for help, that child should get another adult.

    If for any reason a child feels uncomfortable or unsafe at the bus stop they need to bring it to a parent's or caregiver's attention.

Remember, planning ahead is always the best safety measure. Follow these rules and your family will be off danger!