H*g
6 楼
不错,标答。不过问题问的是熊什么颜色,不是熊毛什么颜色哦。
m*l
7 楼
皮肤和内脏都是透明的
p*p
8 楼
这个破题目,我40多年前上初中就做过了,这么多年,还青春不改
a*a
9 楼
证明你非但不懂物理,也不懂地理,更不懂生物
地球表面上你给我找出一个g=10m/s的地方来?
地球表面上你给我找出一个g=10m/s的地方来?
z*6
12 楼
还是不知道怎么得到的结果
http://en.wikipedia.org/wiki/Gravity_of_Earth
In combination, the equatorial bulge and the effects of the Earth's inertia
mean that sea-level gravitational acceleration increases from about 9.780 m
·s−2 at the Equator to about 9.832 m·s−2 at the poles, so an
object will weigh about 0.5% more at the poles than at the Equator
http://en.wikipedia.org/wiki/Gravity_of_Earth
In combination, the equatorial bulge and the effects of the Earth's inertia
mean that sea-level gravitational acceleration increases from about 9.780 m
·s−2 at the Equator to about 9.832 m·s−2 at the poles, so an
object will weigh about 0.5% more at the poles than at the Equator
f*r
17 楼
想当年,小鸡过马路,熊熊掉深坑
n*u
18 楼
赤道9.78,两极9.832
所以大概这个熊在地下141公里处挖煤呢。
所以大概这个熊在地下141公里处挖煤呢。
n*s
22 楼
而且温度有几千度吧。。 这个熊命真苦。
When you're 140 km below the surface, g != 10m/s^2 either. Do you expect to
have infinite gravity at the center of a planet? When you go below the
surface towards the center of the earth, gravitational acceleration actually
DECREASES instead of increases due to the Shell theorem. You're subject to
the gravity of a much smaller planet.
At 140km, g would be equal to approximately 9.81*(6370-140)/6370=9.59m/s^2.
http://en.wikipedia.org/wiki/Shell_theorem
【在 n****u 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 怎么说呢,要是按照质点假设的话,那是有影响的,万有引力和距离平方成反比,力与
: 质量的比和加速度成正比。
: 要不是质点假设,估计坑还要挖的更深些。。。
: 另外这个熊也不能挖煤了。。是我的错。。地下140公里。。。全都是放射性物质,而且温度有几千度吧。。 这个熊命真苦。
: 还是让那个物理老师亲自送下去吧
R*a
23 楼
嗯,不知道他的140km怎么来的。
越往下,外面的球壳引力平衡,所以只有球心对重力加速度有贡献,
越往下,球心质量越小啊,到了地球正中心,重力加速度是0,漂浮状态
to
actually
to
【在 n****s 的大作中提到】![](/moin_static193/solenoid/img/up.png)
:
: 而且温度有几千度吧。。 这个熊命真苦。
: When you're 140 km below the surface, g != 10m/s^2 either. Do you expect to
: have infinite gravity at the center of a planet? When you go below the
: surface towards the center of the earth, gravitational acceleration actually
: DECREASES instead of increases due to the Shell theorem. You're subject to
: the gravity of a much smaller planet.
: At 140km, g would be equal to approximately 9.81*(6370-140)/6370=9.59m/s^2.
: http://en.wikipedia.org/wiki/Shell_theorem
越往下,外面的球壳引力平衡,所以只有球心对重力加速度有贡献,
越往下,球心质量越小啊,到了地球正中心,重力加速度是0,漂浮状态
to
actually
to
【在 n****s 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
:
: 而且温度有几千度吧。。 这个熊命真苦。
: When you're 140 km below the surface, g != 10m/s^2 either. Do you expect to
: have infinite gravity at the center of a planet? When you go below the
: surface towards the center of the earth, gravitational acceleration actually
: DECREASES instead of increases due to the Shell theorem. You're subject to
: the gravity of a much smaller planet.
: At 140km, g would be equal to approximately 9.81*(6370-140)/6370=9.59m/s^2.
: http://en.wikipedia.org/wiki/Shell_theorem
H*g
24 楼
如果地下有大型铀矿呢?
s*h
25 楼
参考答案是白色的。
我以前做过。
我以前做过。
N*p
27 楼
你那个公式只有在球密度均匀的情况下才适用。地球越往下密度越大,所以往下
适当挖一挖有可能重力加速度会增加。大体数据在这里,谁有时间写个程序算算最大值
能不能到10m.s^-2
http://en.wikipedia.org/wiki/Earth#Internal_structure
Depth[81]
km Component Layer Density
>g/cm3
0 - 60 Lithosphere[note 8] —
0 - 35 Crust[note 9] 2.2 - 2.9
35 - 60 Upper mantle 3.4 - 4.4
35 - 2890 Mantle 3.4 - 5.6
100 - 700 Asthenosphere —
2890 - 5100 Outer core 9.9 - 12.2
5100 - 6378 Inner core 12.8 - 13.1
to
actually
to
【在 n****s 的大作中提到】![](/moin_static193/solenoid/img/up.png)
:
: 而且温度有几千度吧。。 这个熊命真苦。
: When you're 140 km below the surface, g != 10m/s^2 either. Do you expect to
: have infinite gravity at the center of a planet? When you go below the
: surface towards the center of the earth, gravitational acceleration actually
: DECREASES instead of increases due to the Shell theorem. You're subject to
: the gravity of a much smaller planet.
: At 140km, g would be equal to approximately 9.81*(6370-140)/6370=9.59m/s^2.
: http://en.wikipedia.org/wiki/Shell_theorem
适当挖一挖有可能重力加速度会增加。大体数据在这里,谁有时间写个程序算算最大值
能不能到10m.s^-2
http://en.wikipedia.org/wiki/Earth#Internal_structure
Depth[81]
km Component Layer Density
>g/cm3
0 - 60 Lithosphere[note 8] —
0 - 35 Crust[note 9] 2.2 - 2.9
35 - 60 Upper mantle 3.4 - 4.4
35 - 2890 Mantle 3.4 - 5.6
100 - 700 Asthenosphere —
2890 - 5100 Outer core 9.9 - 12.2
5100 - 6378 Inner core 12.8 - 13.1
to
actually
to
【在 n****s 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
:
: 而且温度有几千度吧。。 这个熊命真苦。
: When you're 140 km below the surface, g != 10m/s^2 either. Do you expect to
: have infinite gravity at the center of a planet? When you go below the
: surface towards the center of the earth, gravitational acceleration actually
: DECREASES instead of increases due to the Shell theorem. You're subject to
: the gravity of a much smaller planet.
: At 140km, g would be equal to approximately 9.81*(6370-140)/6370=9.59m/s^2.
: http://en.wikipedia.org/wiki/Shell_theorem
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