问题
选择题
一条不可伸长的轻绳跨过质量可忽略不计的定滑轮，绳的一端系一质量m=15kg的重物，重物静止于地面上，有一质量为10Kg的猴子，从绳子的另一端沿绳向上爬，不计滑轮磨擦，在重物不离开地面的条件下，猴子向上爬的最大加速度为（g取10m/s2） [ ]
A．25m/s2
B．10m/s2
C．5m/s2
D．15m/s2
答案
答案：C
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一条不可伸长的轻绳跨过质量可忽略不计的定滑轮，绳的一端系一质量m=15kg的重物，重物静止于地面上，有一质量为10Kg的猴子，从绳子的另一端沿绳向上爬，不计滑轮磨擦，在重物不离开地面的条件下，猴子向上爬的最大加速度为（g取10m/s2） [ ]
A．25m/s2
B．10m/s2
C．5m/s2
D．15m/s2
答案：C
We all know that food gives us energy, but sometimes it can make us much happier when we feel bad. Studies show that foods such as sea fish, bananas, pumpkins and chicken can help fight against bad moods. How can they affect our moods? Studies show that people living by the sea appear much happier than other people, because the fresh sea air helps them clear their minds and they eat a lot of sea fish. Bananas have something that is full of Vitamin B6. Having more bananas can help us make a quick decision, and become more confident. Eating pumpkins can also help people get into a good mood because it’s rich in Vitamin B6 and iron(铁)and it will make us happier. Are you in a bad mood? If you are , don’t sit alone. Go to eat such happy food with your friends. Maybe you’ll be better. 小题1:Food gives us energy and sometimes .
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