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danbelucio
27.08.2020 •
Physics
What is used to measure mass?
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Ответ:
Scientists often measure mass with a balance
Hope this helps
Ответ:
Time to return to same height=1.1632 s
Explanation:
This is a projectile motion
ux=1.2 m/s ,
uy=5.7 m/s
Time to return to same height =t= 2uy/g =2*5.7 /9.8 =1.1632 sec
Horizontal range =uxt =1.2*1.1632 =1.3959 m
Horizontal velocity remains same. But Vertical velocity will change. When it reaches same height it will attain same velocity. But after that vertical velocity will change due to gravity and covers a distance of s= 3.49 m.
Final vertical velocity vy, then vy2=uy2+2gS =5.72+2*9.8*3.49 =100.894 or vy=10.044 m/sec
Magnitude of velocity when it hits water is =sqrt(1.22 +10.0442) =10.116 m/sec
Time to return to same height=1.1632 s