d*a
2 楼
你学物理的时候学可压缩流体了么??
j*9
4 楼
我在勤奋的灌水
水版这么大水借给tg一点
水版这么大水借给tg一点
p*a
5 楼
用的是一根白颜色的橡皮官。只能吃一定要压力。比如说只能吃1KG,这样水就送不上
去。美国的消防车,管子叫HOSE。里面是橡皮的。外面有铁丝包了一圈受力。最后能吃
个10KG。就是送100米高。这样他们有个登高车,就可以叫消防员抱着水枪送到5
0米高去喷,当然就不一样了。
哎,都是跟北洋舰队一样,买了大炮没买炮弹。算了,不说了。
去。美国的消防车,管子叫HOSE。里面是橡皮的。外面有铁丝包了一圈受力。最后能吃
个10KG。就是送100米高。这样他们有个登高车,就可以叫消防员抱着水枪送到5
0米高去喷,当然就不一样了。
哎,都是跟北洋舰队一样,买了大炮没买炮弹。算了,不说了。
k*n
7 楼
直升机吊水上去不行吗??从上面降管子下来
k*n
8 楼
盖高楼的crane搞一个来用
k*n
9 楼
这种时候就体现出机器人研究的重要性了
k*n
10 楼
现在竟然无法遥控空降物品,科学家是干什么吃的
n*r
11 楼
Based on priyanka's assumption, to get the water reach 100 m height,
American hose can hold the weight of 10 kg water at the bottom which is F =
98 N. And the volume of 10 kg of water is 0.01m^3.
When the height of the water level is 100 m, the pressure of the water at
the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
Pa.
To make the American hose hold the water inside, the water touching area at
the at the bottom of the American hose should not exceed A = F/P = 98/(9.
8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
area is the hose material area, and at the bottom 0.01m height of the
American hose, the perimeter of the hose is = 0.0001m^2/0.01m = 0.01m. The
diameter of the American hose is D = 0.01m / 3.14 = 0.003 m = 3 mm.
So the American firefighters can reach 100m height with 3 mm diameter American hose to put out the fire on the skyscraper. God bless America!
【在 p******a 的大作中提到】
: 用的是一根白颜色的橡皮官。只能吃一定要压力。比如说只能吃1KG,这样水就送不上
: 去。美国的消防车,管子叫HOSE。里面是橡皮的。外面有铁丝包了一圈受力。最后能吃
: 个10KG。就是送100米高。这样他们有个登高车,就可以叫消防员抱着水枪送到5
: 0米高去喷,当然就不一样了。
: 哎,都是跟北洋舰队一样,买了大炮没买炮弹。算了,不说了。
American hose can hold the weight of 10 kg water at the bottom which is F =
98 N. And the volume of 10 kg of water is 0.01m^3.
When the height of the water level is 100 m, the pressure of the water at
the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
Pa.
To make the American hose hold the water inside, the water touching area at
the at the bottom of the American hose should not exceed A = F/P = 98/(9.
8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
area is the hose material area, and at the bottom 0.01m height of the
American hose, the perimeter of the hose is = 0.0001m^2/0.01m = 0.01m. The
diameter of the American hose is D = 0.01m / 3.14 = 0.003 m = 3 mm.
So the American firefighters can reach 100m height with 3 mm diameter American hose to put out the fire on the skyscraper. God bless America!
【在 p******a 的大作中提到】
: 用的是一根白颜色的橡皮官。只能吃一定要压力。比如说只能吃1KG,这样水就送不上
: 去。美国的消防车,管子叫HOSE。里面是橡皮的。外面有铁丝包了一圈受力。最后能吃
: 个10KG。就是送100米高。这样他们有个登高车,就可以叫消防员抱着水枪送到5
: 0米高去喷,当然就不一样了。
: 哎,都是跟北洋舰队一样,买了大炮没买炮弹。算了,不说了。
z*y
12 楼
废话。女优的肌肉力量是有限的。。。。。。
y*i
13 楼
这个有点抬杠了哈,他用的是10kg,其实指的是压强,不是压力。不过搞工程的单位是
容易被理科生误解。
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
容易被理科生误解。
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
B*e
14 楼
不能用钢管?
民科生顶锅盖跑过。。。
民科生顶锅盖跑过。。。
k*1
18 楼
不知道你算的是什么,你假设10kg水,高度100m,假设为圆柱形,面积自然就算出来了
。m=rho*V=rho*s*h, s=m/(rho*h),so s=0.0001 m^2
rho是水的密度,1000 kg/m^3
s是面积
h是水的高度,100m
m水的质量,10kg
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
。m=rho*V=rho*s*h, s=m/(rho*h),so s=0.0001 m^2
rho是水的密度,1000 kg/m^3
s是面积
h是水的高度,100m
m水的质量,10kg
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
n*r
22 楼
Who the hell said kg is the unit of force? Can you even read?
Your expression capability is as poor as your science. I am an engineering
already, and I am talking to engineers everyday and no engineers will tell
you kg has ever been unit of pressure. If you want to say "lb" in the
English unit system can express different meaning in MASS and FORCE, I have
to tell you that, engineers will use lbm for unit of MASS and lbf for unit
of FORCE. But nobody will ever use lb for unit of PRESSURE.
【在 y****i 的大作中提到】
: And the kg is not the unit of force either. However, if you have talked to
: some engineer, you would know they have different force, pressure
: understanding, etc.
Your expression capability is as poor as your science. I am an engineering
already, and I am talking to engineers everyday and no engineers will tell
you kg has ever been unit of pressure. If you want to say "lb" in the
English unit system can express different meaning in MASS and FORCE, I have
to tell you that, engineers will use lbm for unit of MASS and lbf for unit
of FORCE. But nobody will ever use lb for unit of PRESSURE.
【在 y****i 的大作中提到】
: And the kg is not the unit of force either. However, if you have talked to
: some engineer, you would know they have different force, pressure
: understanding, etc.
y*i
23 楼
OK, i didn't mean you said that. But look at his original post, he said
something like 10 kg force. Since it is originally wrong according to your
knowledge, why bother to do calculation and prove it is wrong based on your
assumption?
I just want to remind you it could be true if he meant 10 kg/cm2 which is 10
atm and 100 m according to the unit you could understand. I had this issue
talking with an oil field engineer with the pressure and force etc. I might
be wrong to think all the engineer are same because there is difference
between IT engineers and mechanical engineers.
have
【在 n**********r 的大作中提到】
: Who the hell said kg is the unit of force? Can you even read?
: Your expression capability is as poor as your science. I am an engineering
: already, and I am talking to engineers everyday and no engineers will tell
: you kg has ever been unit of pressure. If you want to say "lb" in the
: English unit system can express different meaning in MASS and FORCE, I have
: to tell you that, engineers will use lbm for unit of MASS and lbf for unit
: of FORCE. But nobody will ever use lb for unit of PRESSURE.
something like 10 kg force. Since it is originally wrong according to your
knowledge, why bother to do calculation and prove it is wrong based on your
assumption?
I just want to remind you it could be true if he meant 10 kg/cm2 which is 10
atm and 100 m according to the unit you could understand. I had this issue
talking with an oil field engineer with the pressure and force etc. I might
be wrong to think all the engineer are same because there is difference
between IT engineers and mechanical engineers.
have
【在 n**********r 的大作中提到】
: Who the hell said kg is the unit of force? Can you even read?
: Your expression capability is as poor as your science. I am an engineering
: already, and I am talking to engineers everyday and no engineers will tell
: you kg has ever been unit of pressure. If you want to say "lb" in the
: English unit system can express different meaning in MASS and FORCE, I have
: to tell you that, engineers will use lbm for unit of MASS and lbf for unit
: of FORCE. But nobody will ever use lb for unit of PRESSURE.
n*r
24 楼
According to your calculation, I got the following conclusion:
10 kg/cm^2 = 1 x 10^5 kg/m^2 = 10 atm = 1.013 x 10^6 pa = 1.013 x 10^6 N/m^2
so 1 kg = 10.13 N
your
10
issue
might
【在 y****i 的大作中提到】
: OK, i didn't mean you said that. But look at his original post, he said
: something like 10 kg force. Since it is originally wrong according to your
: knowledge, why bother to do calculation and prove it is wrong based on your
: assumption?
: I just want to remind you it could be true if he meant 10 kg/cm2 which is 10
: atm and 100 m according to the unit you could understand. I had this issue
: talking with an oil field engineer with the pressure and force etc. I might
: be wrong to think all the engineer are same because there is difference
: between IT engineers and mechanical engineers.
:
10 kg/cm^2 = 1 x 10^5 kg/m^2 = 10 atm = 1.013 x 10^6 pa = 1.013 x 10^6 N/m^2
so 1 kg = 10.13 N
your
10
issue
might
【在 y****i 的大作中提到】
: OK, i didn't mean you said that. But look at his original post, he said
: something like 10 kg force. Since it is originally wrong according to your
: knowledge, why bother to do calculation and prove it is wrong based on your
: assumption?
: I just want to remind you it could be true if he meant 10 kg/cm2 which is 10
: atm and 100 m according to the unit you could understand. I had this issue
: talking with an oil field engineer with the pressure and force etc. I might
: be wrong to think all the engineer are same because there is difference
: between IT engineers and mechanical engineers.
:
y*i
26 楼
对你真的很无语了,是该夸你严谨还是呆板呢?你拿这些初中物理出来表示什么呢?
你不如直接用我说的10kg/cm2 =100m 更能显示我的无知。
建议你多学一点估算。我说说我的理解吧,原贴就两个数字,10 kg, 100m, 如果你知
道1个大气压大约等于(对你我都不敢直接写等于)10米高水柱的产生的压强,而一个
大气压大约等于1公斤力每平方厘米,1公斤力大约等于10牛,以及水的密度。这些都算
常识吧,然后你就明白原贴在说什么了,10kg 是怎么和100m 联系上了。而不是算上一
堆奇怪的东西。如果我要硬来挑错,也就是指出原作者不该用公斤和压力,但是我知道
有些工程师口语就是用这个,而且是在BBS上一些简化说法而已。估计原作者都懒得和
你解释这些,到是我这个搞理科和你这个不知道什么专业的工程师解释这些工程上的东
西。
^2
【在 n**********r 的大作中提到】
: According to your calculation, I got the following conclusion:
: 10 kg/cm^2 = 1 x 10^5 kg/m^2 = 10 atm = 1.013 x 10^6 pa = 1.013 x 10^6 N/m^2
: so 1 kg = 10.13 N
:
: your
: 10
: issue
: might
你不如直接用我说的10kg/cm2 =100m 更能显示我的无知。
建议你多学一点估算。我说说我的理解吧,原贴就两个数字,10 kg, 100m, 如果你知
道1个大气压大约等于(对你我都不敢直接写等于)10米高水柱的产生的压强,而一个
大气压大约等于1公斤力每平方厘米,1公斤力大约等于10牛,以及水的密度。这些都算
常识吧,然后你就明白原贴在说什么了,10kg 是怎么和100m 联系上了。而不是算上一
堆奇怪的东西。如果我要硬来挑错,也就是指出原作者不该用公斤和压力,但是我知道
有些工程师口语就是用这个,而且是在BBS上一些简化说法而已。估计原作者都懒得和
你解释这些,到是我这个搞理科和你这个不知道什么专业的工程师解释这些工程上的东
西。
^2
【在 n**********r 的大作中提到】
: According to your calculation, I got the following conclusion:
: 10 kg/cm^2 = 1 x 10^5 kg/m^2 = 10 atm = 1.013 x 10^6 pa = 1.013 x 10^6 N/m^2
: so 1 kg = 10.13 N
:
: your
: 10
: issue
: might
k*1
30 楼
你整个一个250engineer,别JB给engineer丢脸了。
have
【在 n**********r 的大作中提到】
: Who the hell said kg is the unit of force? Can you even read?
: Your expression capability is as poor as your science. I am an engineering
: already, and I am talking to engineers everyday and no engineers will tell
: you kg has ever been unit of pressure. If you want to say "lb" in the
: English unit system can express different meaning in MASS and FORCE, I have
: to tell you that, engineers will use lbm for unit of MASS and lbf for unit
: of FORCE. But nobody will ever use lb for unit of PRESSURE.
have
【在 n**********r 的大作中提到】
: Who the hell said kg is the unit of force? Can you even read?
: Your expression capability is as poor as your science. I am an engineering
: already, and I am talking to engineers everyday and no engineers will tell
: you kg has ever been unit of pressure. If you want to say "lb" in the
: English unit system can express different meaning in MASS and FORCE, I have
: to tell you that, engineers will use lbm for unit of MASS and lbf for unit
: of FORCE. But nobody will ever use lb for unit of PRESSURE.
k*1
31 楼
这么简单的中学物理问题,怎么搞得这么复杂?
10kg水,密度1000kg/m^3, 体积就算出来了。再除以高度100米,不就是面积吗?
根压强,压力狗屁关系都没有。
【在 y****i 的大作中提到】
: 对你真的很无语了,是该夸你严谨还是呆板呢?你拿这些初中物理出来表示什么呢?
: 你不如直接用我说的10kg/cm2 =100m 更能显示我的无知。
: 建议你多学一点估算。我说说我的理解吧,原贴就两个数字,10 kg, 100m, 如果你知
: 道1个大气压大约等于(对你我都不敢直接写等于)10米高水柱的产生的压强,而一个
: 大气压大约等于1公斤力每平方厘米,1公斤力大约等于10牛,以及水的密度。这些都算
: 常识吧,然后你就明白原贴在说什么了,10kg 是怎么和100m 联系上了。而不是算上一
: 堆奇怪的东西。如果我要硬来挑错,也就是指出原作者不该用公斤和压力,但是我知道
: 有些工程师口语就是用这个,而且是在BBS上一些简化说法而已。估计原作者都懒得和
: 你解释这些,到是我这个搞理科和你这个不知道什么专业的工程师解释这些工程上的东
: 西。
10kg水,密度1000kg/m^3, 体积就算出来了。再除以高度100米,不就是面积吗?
根压强,压力狗屁关系都没有。
【在 y****i 的大作中提到】
: 对你真的很无语了,是该夸你严谨还是呆板呢?你拿这些初中物理出来表示什么呢?
: 你不如直接用我说的10kg/cm2 =100m 更能显示我的无知。
: 建议你多学一点估算。我说说我的理解吧,原贴就两个数字,10 kg, 100m, 如果你知
: 道1个大气压大约等于(对你我都不敢直接写等于)10米高水柱的产生的压强,而一个
: 大气压大约等于1公斤力每平方厘米,1公斤力大约等于10牛,以及水的密度。这些都算
: 常识吧,然后你就明白原贴在说什么了,10kg 是怎么和100m 联系上了。而不是算上一
: 堆奇怪的东西。如果我要硬来挑错,也就是指出原作者不该用公斤和压力,但是我知道
: 有些工程师口语就是用这个,而且是在BBS上一些简化说法而已。估计原作者都懒得和
: 你解释这些,到是我这个搞理科和你这个不知道什么专业的工程师解释这些工程上的东
: 西。
b*s
33 楼
是工程限制,不是物理限制。不过对广大民众来说就是一回事了。
y*e
35 楼
也真是难得,一群物理盲,居然就没有一个说对的
b*n
36 楼
我觉得说得还是有点道理嘛
n*r
37 楼
Who told you there is only 10kg water in the hose? She said the hose can
hold 10kg water does not mean there is only 10kg water in the hose.
And even there is same amount of water in the hose, if the height of the
water is different, the pressure is different.
And at the bottom, the area you calculated is the area of the bottom. Who
cares about the area at the bottom? Is any hose material on the bottom? I was
calculating the area of the hose which is touching the water. It's around
the bottom.
You don't know shit for sure.
10kg水,100m高度是合理的?为什么不是100kg水,50m高度?
【在 k*******1 的大作中提到】
: 你真是个狗屎。假设10kg水,水不可压,密度为常数,体积就已经固定了,在假设高度
: 100m,假设水为圆柱形,当然面积就固定了。
: 还算装模做样算压力,压强,简直是脱裤子放屁。
: 你假设10kg水,100m 高度,这两个条件就决定了水柱面积了。可问题是,谁告诉你10kg水,100m高度是合理的?为什么不是100kg水,50m高度?
hold 10kg water does not mean there is only 10kg water in the hose.
And even there is same amount of water in the hose, if the height of the
water is different, the pressure is different.
And at the bottom, the area you calculated is the area of the bottom. Who
cares about the area at the bottom? Is any hose material on the bottom? I was
calculating the area of the hose which is touching the water. It's around
the bottom.
You don't know shit for sure.
10kg水,100m高度是合理的?为什么不是100kg水,50m高度?
【在 k*******1 的大作中提到】
: 你真是个狗屎。假设10kg水,水不可压,密度为常数,体积就已经固定了,在假设高度
: 100m,假设水为圆柱形,当然面积就固定了。
: 还算装模做样算压力,压强,简直是脱裤子放屁。
: 你假设10kg水,100m 高度,这两个条件就决定了水柱面积了。可问题是,谁告诉你10kg水,100m高度是合理的?为什么不是100kg水,50m高度?
n*r
38 楼
If you consider the water is flowing, you have to include the original
pressure at your original condition.
Because for the same water in the hose, v^2/2+hg+P/density = constant. Search
bernoulli equation on google for details please.
And if you only study physics in high school, you need to learn more.
【在 k*******1 的大作中提到】
: 正确解,是水的初始速度决定了水柱能到达的最大高度
: H=1/2*V0^2/g
: V0 是水的初始速度。
: (前提是不考虑水在水管内的Friction Loss)
pressure at your original condition.
Because for the same water in the hose, v^2/2+hg+P/density = constant. Search
bernoulli equation on google for details please.
And if you only study physics in high school, you need to learn more.
【在 k*******1 的大作中提到】
: 正确解,是水的初始速度决定了水柱能到达的最大高度
: H=1/2*V0^2/g
: V0 是水的初始速度。
: (前提是不考虑水在水管内的Friction Loss)
k*1
39 楼
整个一个250,脑袋进水了吧
如果水不是10kg,那你计算面积的时候,A=F/P,F怎么得出来的,你难道不是用F=mg来计
算的?
这是你的原贴:
"American hose can hold the weight of 10 kg water at the bottom which is F =
98 N. And the volume of 10 kg of water is 0.01m^3."
F=98N你怎么得出来的?你已经假设"American hose can hold the weight of 10 kg
water",又假设100m高度,水柱的截面积当然就确定了,你还算个JB压力压强?
煞笔一个,靠
was
【在 n**********r 的大作中提到】
: Who told you there is only 10kg water in the hose? She said the hose can
: hold 10kg water does not mean there is only 10kg water in the hose.
: And even there is same amount of water in the hose, if the height of the
: water is different, the pressure is different.
: And at the bottom, the area you calculated is the area of the bottom. Who
: cares about the area at the bottom? Is any hose material on the bottom? I was
: calculating the area of the hose which is touching the water. It's around
: the bottom.
: You don't know shit for sure.
:
如果水不是10kg,那你计算面积的时候,A=F/P,F怎么得出来的,你难道不是用F=mg来计
算的?
这是你的原贴:
"American hose can hold the weight of 10 kg water at the bottom which is F =
98 N. And the volume of 10 kg of water is 0.01m^3."
F=98N你怎么得出来的?你已经假设"American hose can hold the weight of 10 kg
water",又假设100m高度,水柱的截面积当然就确定了,你还算个JB压力压强?
煞笔一个,靠
was
【在 n**********r 的大作中提到】
: Who told you there is only 10kg water in the hose? She said the hose can
: hold 10kg water does not mean there is only 10kg water in the hose.
: And even there is same amount of water in the hose, if the height of the
: water is different, the pressure is different.
: And at the bottom, the area you calculated is the area of the bottom. Who
: cares about the area at the bottom? Is any hose material on the bottom? I was
: calculating the area of the hose which is touching the water. It's around
: the bottom.
: You don't know shit for sure.
:
k*1
40 楼
废话,贝努力方程谁不知道
v^2/2+hg+P/density = constant.
(v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
i代表inlet 在bottom
e代表exit 在top
我说过假设没有friction loss(不太切合实际,但是一个初步假设)
意味着Pi = Pe
在inlet, hi=0,Vi=V0
在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
so
he=V^2/2g
你Y满脑袋狗屎,还楞充Engineer,别JB给ENGINEER丢脸了,基本的物理概念都不懂。
Search
【在 n**********r 的大作中提到】
: If you consider the water is flowing, you have to include the original
: pressure at your original condition.
: Because for the same water in the hose, v^2/2+hg+P/density = constant. Search
: bernoulli equation on google for details please.
: And if you only study physics in high school, you need to learn more.
v^2/2+hg+P/density = constant.
(v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
i代表inlet 在bottom
e代表exit 在top
我说过假设没有friction loss(不太切合实际,但是一个初步假设)
意味着Pi = Pe
在inlet, hi=0,Vi=V0
在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
so
he=V^2/2g
你Y满脑袋狗屎,还楞充Engineer,别JB给ENGINEER丢脸了,基本的物理概念都不懂。
Search
【在 n**********r 的大作中提到】
: If you consider the water is flowing, you have to include the original
: pressure at your original condition.
: Because for the same water in the hose, v^2/2+hg+P/density = constant. Search
: bernoulli equation on google for details please.
: And if you only study physics in high school, you need to learn more.
n*r
42 楼
I did not use the volume of the water in my calculation.
And F is the force on the hose material not bottom. Please use your brain,
not your ass.
=
【在 k*******1 的大作中提到】
: 整个一个250,脑袋进水了吧
: 如果水不是10kg,那你计算面积的时候,A=F/P,F怎么得出来的,你难道不是用F=mg来计
: 算的?
: 这是你的原贴:
: "American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3."
: F=98N你怎么得出来的?你已经假设"American hose can hold the weight of 10 kg
: water",又假设100m高度,水柱的截面积当然就确定了,你还算个JB压力压强?
: 煞笔一个,靠
:
And F is the force on the hose material not bottom. Please use your brain,
not your ass.
=
【在 k*******1 的大作中提到】
: 整个一个250,脑袋进水了吧
: 如果水不是10kg,那你计算面积的时候,A=F/P,F怎么得出来的,你难道不是用F=mg来计
: 算的?
: 这是你的原贴:
: "American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3."
: F=98N你怎么得出来的?你已经假设"American hose can hold the weight of 10 kg
: water",又假设100m高度,水柱的截面积当然就确定了,你还算个JB压力压强?
: 煞笔一个,靠
:
n*r
43 楼
Who told you Pi=Pe, stupid shit?
v^2/2+hg+P/density = constant.
(v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
i代表inlet 在bottom
e代表exit 在top
我说过假设没有friction loss(不太切合实际,但是一个初步假设)
意味着Pi = Pe
在inlet, hi=0,Vi=V0
在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
so
he=V^2/2g
你Y满脑袋狗屎,还楞充Engineer,别JB给ENGINEER丢脸了,基本的物理概念都不懂。
Search
【在 k*******1 的大作中提到】
: 废话,贝努力方程谁不知道
: v^2/2+hg+P/density = constant.
: (v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
: i代表inlet 在bottom
: e代表exit 在top
: 我说过假设没有friction loss(不太切合实际,但是一个初步假设)
: 意味着Pi = Pe
: 在inlet, hi=0,Vi=V0
: 在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
: so
v^2/2+hg+P/density = constant.
(v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
i代表inlet 在bottom
e代表exit 在top
我说过假设没有friction loss(不太切合实际,但是一个初步假设)
意味着Pi = Pe
在inlet, hi=0,Vi=V0
在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
so
he=V^2/2g
你Y满脑袋狗屎,还楞充Engineer,别JB给ENGINEER丢脸了,基本的物理概念都不懂。
Search
【在 k*******1 的大作中提到】
: 废话,贝努力方程谁不知道
: v^2/2+hg+P/density = constant.
: (v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
: i代表inlet 在bottom
: e代表exit 在top
: 我说过假设没有friction loss(不太切合实际,但是一个初步假设)
: 意味着Pi = Pe
: 在inlet, hi=0,Vi=V0
: 在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
: so
k*1
44 楼
You are such an idiot.
Assuming 0 friction loss, of course Pi=Pe. Don't tell me you want to include
pressure of water column. There is a h*g term in there already took care of
it.
【在 n**********r 的大作中提到】
: Who told you Pi=Pe, stupid shit?
:
: v^2/2+hg+P/density = constant.
: (v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
: i代表inlet 在bottom
: e代表exit 在top
: 我说过假设没有friction loss(不太切合实际,但是一个初步假设)
: 意味着Pi = Pe
: 在inlet, hi=0,Vi=V0
: 在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
Assuming 0 friction loss, of course Pi=Pe. Don't tell me you want to include
pressure of water column. There is a h*g term in there already took care of
it.
【在 n**********r 的大作中提到】
: Who told you Pi=Pe, stupid shit?
:
: v^2/2+hg+P/density = constant.
: (v^2/2+hg+P/density)i =(v^2/2+hg+P/density)e
: i代表inlet 在bottom
: e代表exit 在top
: 我说过假设没有friction loss(不太切合实际,但是一个初步假设)
: 意味着Pi = Pe
: 在inlet, hi=0,Vi=V0
: 在outlet he=水的高度, Ve=0,(假设在最高点,水的速度达到0)
k*1
45 楼
你是不是长个驴脑袋,
A=F/P,是你列出来的公式,
“To make the American hose hold the water inside, the water touching area at
the at the bottom of the American hose should not exceed A = F/P = 98/(9.
8x10^5 )=0.0001m^2.”
你又说" F is the force on the hose material not
bottom"
那你得出的A是什么面积?
【在 n**********r 的大作中提到】
: I did not use the volume of the water in my calculation.
: And F is the force on the hose material not bottom. Please use your brain,
: not your ass.
:
: =
A=F/P,是你列出来的公式,
“To make the American hose hold the water inside, the water touching area at
the at the bottom of the American hose should not exceed A = F/P = 98/(9.
8x10^5 )=0.0001m^2.”
你又说" F is the force on the hose material not
bottom"
那你得出的A是什么面积?
【在 n**********r 的大作中提到】
: I did not use the volume of the water in my calculation.
: And F is the force on the hose material not bottom. Please use your brain,
: not your ass.
:
: =
b*r
46 楼
这点粪水够剿灭那个大火了~~
n*r
47 楼
You failed already in your equation. And your Pi=Pe is so stupid result only you such an idiot can get.
include
of
【在 k*******1 的大作中提到】
: You are such an idiot.
: Assuming 0 friction loss, of course Pi=Pe. Don't tell me you want to include
: pressure of water column. There is a h*g term in there already took care of
: it.
include
of
【在 k*******1 的大作中提到】
: You are such an idiot.
: Assuming 0 friction loss, of course Pi=Pe. Don't tell me you want to include
: pressure of water column. There is a h*g term in there already took care of
: it.
n*r
48 楼
I said "water touching area".
at
【在 k*******1 的大作中提到】
: 你是不是长个驴脑袋,
: A=F/P,是你列出来的公式,
: “To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2.”
: 你又说" F is the force on the hose material not
: bottom"
: 那你得出的A是什么面积?
at
【在 k*******1 的大作中提到】
: 你是不是长个驴脑袋,
: A=F/P,是你列出来的公式,
: “To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2.”
: 你又说" F is the force on the hose material not
: bottom"
: 那你得出的A是什么面积?
H*r
57 楼
我怎么想到朝吹了。。。
O*d
58 楼
10公斤/平方厘米的水压,在理论上是可以把水送上100米的高度,管道
的运送效率较高,基本上可以把水送到那个高度。 喷射的效率较低,有
空气阻力,喷嘴形状限制等,就算损失百分之50的能量,也可以把水喷
到50米高度。
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
的运送效率较高,基本上可以把水送到那个高度。 喷射的效率较低,有
空气阻力,喷嘴形状限制等,就算损失百分之50的能量,也可以把水喷
到50米高度。
=
^5
at
【在 n**********r 的大作中提到】
: Based on priyanka's assumption, to get the water reach 100 m height,
: American hose can hold the weight of 10 kg water at the bottom which is F =
: 98 N. And the volume of 10 kg of water is 0.01m^3.
: When the height of the water level is 100 m, the pressure of the water at
: the bottom of the American hose is P = 1000kg/m^3X100mX9.8N m/s^2 = 9.8x10^5
: Pa.
: To make the American hose hold the water inside, the water touching area at
: the at the bottom of the American hose should not exceed A = F/P = 98/(9.
: 8x10^5 )=0.0001m^2. The American hose is tube shape, so the water touching
: area is the hose material area, and at the bottom 0.01m height of the
k*1
59 楼
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