FInd the acceleration of mass A of the system? Find the time it takes for Mass B to fall a height of 80 cm? Find the speed of mass B at 80cm?
回答 (2)
2020-05-12 4:02 pm
acceleration a =Mb*g/(Ma+Mb) = 0,400*g/0,600 = 2g/3 m/sec^2 (≅ 6.538)
falling time t = √2h/a = √1.6*1.5/g = √ 2.4/9.807 = 0.495 sec
final speed V = a*t = 6.538*0.495 = 3.234 m/sec
or
Mb*g*h = (Mb+Ma)/2*V^2
0.32*9,807 = 0.3*V^2
V = √0.32*9.807 / 0.3 = 3.234 m/sec
falling time t = √2h/a = √1.6*1.5/g = √ 2.4/9.807 = 0.495 sec
final speed V = a*t = 6.538*0.495 = 3.234 m/sec
or
Mb*g*h = (Mb+Ma)/2*V^2
0.32*9,807 = 0.3*V^2
V = √0.32*9.807 / 0.3 = 3.234 m/sec
2020-05-12 1:15 pm
Force of gravity = g * 0.4 kg
total mass of system = 0.6 kg
a = g * 0.4 kg / 0.6 kg
total mass of system = 0.6 kg
a = g * 0.4 kg / 0.6 kg
收錄日期: 2021-04-24 07:50:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200512050026AAtHkrc