2019年湖北省黄冈市中考物理模拟试题参考答案.doc

2019年湖北省黄冈市中考物理模拟试题参考答案
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1．D
2．C
3．A
4．D
5．A
6．A
7．B
8．C
9．C
10．B
11．答：因为室内空气中含有大量的水蒸气，由于水蒸气遇到温度较低的窗户会液化成小水滴而附在纸条上，从而因潮湿而脱落，所以不把纸条粘在室内的窗缝处。
12．要点：（1）动能，一定质量的水速度越大、动能就越大，对外做功的本领就越大，从而能切割坚硬的物体。（或：高速水流对被切割物体的压强很大，从而能切割坚硬的物体。）（2）加入砂质磨料后，水流的质量增大，高速水流具有的动能就更大，在流速相同的情况下对外做功的本领就更大，从而切割能力大大提高。（或：加入砂质磨料后的高速水流对被切割物体的压强更大，从而切割能力大大提高。）
13．（1）尽可能地反射阳光；稳固油罐，增大容积；（2）比热容；水蒸发吸热
14．甲，总功率过大。
15、变大，甲，插座与插头或开关处
19．①装置如图。
②将金属块放在泡沫上使它们能够漂浮在水面上，
量出泡沫在水中的深度为h
由F浮=G排=r水gV排=r水ga2h
又∵漂浮F浮=G总=G泡+G金≈G金=m金g
∴m