UC知道几道 英语物理题..大家帮帮忙><
来源：百度知道 编辑：UC知道 时间：2024/09/26 01:25:44
几道 英语物理题..麻烦大家帮帮忙><
.很急吖.
.要考试了.!
1.a.
Using W=mg calculate the weight of a 2.0kg mass on Earth.
b.
Using Newton`s law of gravitation calculate the gravitational force on a 2.0kg mass on the Earth`s surface.
c.
What do you notice about your answers to parts (a) and (b)?
2. Calculate the gravitational forcebetween
a. two protons of mass 1.67*10[-27]kg separated by 1.40*10[-14]m,
b.a dog of mass 35kg in the UK and a 60kg kangaroo on the other side of the world in Australia,
c.two stars of mass 4.00*10[33]kg and 6.00*10[30]kg separated by 3.65*10[20]m.
3. Find the mass of Jupiter given that the gravitational field strength, g, at its surface is 25.9Nk[-1] and its radius is 7.15*10[7].
4.Calculate the velocity of Venus in its orbit around the Sun.The radius of its orbit is 1.08*10[11]m.
.很急吖.
.要考试了.!
1.a.
Using W=mg calculate the weight of a 2.0kg mass on Earth.
b.
Using Newton`s law of gravitation calculate the gravitational force on a 2.0kg mass on the Earth`s surface.
c.
What do you notice about your answers to parts (a) and (b)?
2. Calculate the gravitational forcebetween
a. two protons of mass 1.67*10[-27]kg separated by 1.40*10[-14]m,
b.a dog of mass 35kg in the UK and a 60kg kangaroo on the other side of the world in Australia,
c.two stars of mass 4.00*10[33]kg and 6.00*10[30]kg separated by 3.65*10[20]m.
3. Find the mass of Jupiter given that the gravitational field strength, g, at its surface is 25.9Nk[-1] and its radius is 7.15*10[7].
4.Calculate the velocity of Venus in its orbit around the Sun.The radius of its orbit is 1.08*10[11]m.
第一题a是让你用w=mg这个公式求地球上一个2kg物体所受重力
解：g=9.8N/kg(on earth) m=2.0kg So w=mg=2.0*9.8N=1.96N
b是用万有引力定律求地球表面2kg物体所受地球的引力
解：According to F=GMm/R^2 So F=2GMm/R^2=2*6.67*6*(10^13)/(6370000^2)=3.1N
c The gravitational force is larger than the weight of a 2.0kg mass on Earth
没有看明白