UC知道帮忙解下英文物理题
来源：百度知道 编辑：UC知道 时间：2024/06/05 05:51:05
1.A moon of mass 8.89E22 kg orbits a planet of mass 8.53E24 kg in a circle of radius 5.85E5 km. Find the distance from the center of the planet to the center of mass of the planet-moon system.
2.The front of a 106 kg symmetrical rowboat 6.19 m long points toward the shore. Harry, mass 91 kg, stands in the back of the boat, exactly 28.1 m from the shore. If Harry now walks to the front of the boat, how far will he be from the shore?
2.The front of a 106 kg symmetrical rowboat 6.19 m long points toward the shore. Harry, mass 91 kg, stands in the back of the boat, exactly 28.1 m from the shore. If Harry now walks to the front of the boat, how far will he be from the shore?
1、
m1*ω²*r1=m2*ω²*r2
m1*r1=m2*r2
r1+r2=r
r1=[m2/(m1+m2)]r=[853/(8.89+853)]×(5.85E5)≈5.79×10^5Km
r1=[m2/(m1+m2)]r=[853/(8.89+853)]×(5.85E5)≈6.03×10³Km
2、
m1=91Kg m2=106Kg
m1*V1=m2*V2
m1*L1=m2*L2
L1+L2=L
L1=[m2/(m1+m2)]L=[106/(91+106)]×6.19m≈3.33m
28.1-3.33=24.8m