作业帮最好会英文的...1 A turtle is moving with a constant acceleration a
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最好会英文的...
1 A turtle is moving with a constant acceleration along a straight ditch.He starts his stopwatch as he passes a fence post and notes that it takes him 10s to reach a pine tree 10m farther along the ditch.As he passes the pine tree,his speed is 1.2m/s.How far was he from the fence post when he started from rest?
2.A 50g pen has a retractable tip controlled by a button on the other end and an internal spring that has a constant of 1200N/m.Suppose you hold the pen vertically on a table the tip pointing up.Clicking the button into the table compresses the spring 0.5cm.When the pen is released,how fast will it rise from the table?To what vertical height will it rise?
3.What is the difference between the wavelengths of red light and blue light?Frequency of red light is 4x10^14 Hz,and the frequency of blue light is 7x10^14 Hz.The speed of light is always 3x10^8.
4.How long would it take a jet travelling at Mach 1.8 to fly a distance of 10500km?the air temperature at this elevation is -4.44°C.
目前先问这些,最好有过程.
分数要在看了答案才能加,因为如果现在加了,等问题关闭时候万一没人回答我的分数就回不来了...
但是我肯定会至少给100分的!
看到了回一个,
...看了你们的回答,就2楼帮了忙了...
ps,我是真的不需要翻译,英语100%明白,.
1 A turtle is moving with a constant acceleration along a straight ditch.He starts his stopwatch as he passes a fence post and notes that it takes him 10s to reach a pine tree 10m farther along the ditch.As he passes the pine tree,his speed is 1.2m/s.How far was he from the fence post when he started from rest?
2.A 50g pen has a retractable tip controlled by a button on the other end and an internal spring that has a constant of 1200N/m.Suppose you hold the pen vertically on a table the tip pointing up.Clicking the button into the table compresses the spring 0.5cm.When the pen is released,how fast will it rise from the table?To what vertical height will it rise?
3.What is the difference between the wavelengths of red light and blue light?Frequency of red light is 4x10^14 Hz,and the frequency of blue light is 7x10^14 Hz.The speed of light is always 3x10^8.
4.How long would it take a jet travelling at Mach 1.8 to fly a distance of 10500km?the air temperature at this elevation is -4.44°C.
目前先问这些,最好有过程.
分数要在看了答案才能加,因为如果现在加了,等问题关闭时候万一没人回答我的分数就回不来了...
但是我肯定会至少给100分的!
看到了回一个,
...看了你们的回答,就2楼帮了忙了...
ps,我是真的不需要翻译,英语100%明白,.
第1题：10s 10m说明后半段平均速度为1m/s,故过篱笆时速度为0.8m/s,由此的加速度0.04m/s^2,再由公式s=v^2/2a得所求距离8m
第2题：用能量做.弹性势能0.5kx^2转动能0.5mv^2再转重力势能mgh.0.77m/s;3.1cm
第3题：2楼哥们不错
第4题：声速用c=(rRT)^1/2计算,r为绝热系数可取1.4,R为质量波尔兹曼常数,T绝对温度.声速乘1.8马赫得速度,用距离除以速度即时间.答案约5小时如果没算错的话
第2题：用能量做.弹性势能0.5kx^2转动能0.5mv^2再转重力势能mgh.0.77m/s;3.1cm
第3题：2楼哥们不错
第4题：声速用c=(rRT)^1/2计算,r为绝热系数可取1.4,R为质量波尔兹曼常数,T绝对温度.声速乘1.8马赫得速度,用距离除以速度即时间.答案约5小时如果没算错的话
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