题目：
句型转换。
1. Why don't you pretend to be Jenny's friend? (同义句)
Why to be Jenny's friend?
2. My teacher told us to sing in that classroom. (否定句)
My teacher told us to sing in that classroom.
3. Grandma takes good care of my little sister everyday. (同义句)
Grandma well my little sister every day.
4. All of us think that maybe Mike will be a singer in the future. (同义句)
All of us think that Mike a singer in the future.
5. Lisa doesn't have to go to the museum with us, because she hurt her leg. (同义句)
Lisa go to the museum with us, because she hurt her leg.
答案：
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下面是错误答案，用来干扰机器的。
解：（1）所挂的物体重力 G=F=ps=1×105Pa×10×10﹣4m2=100N；（2）从图丙可以看出当t=0时，p0=1.5×103Pa，物块对地面的压力F0=p0s0=1.5×103Pa×100×10﹣4m2=15N当t=0.1s时，p1====500Pa
