Asked by BA
A 400 kg baby grand piano is raised to the roof of a 100 m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics.
Answers
Answered by
Elena
(a) using dynamics
mgh=mv²/2
v=sqrt(2gh)
(b) using kinenatics
h=gt²/2 =>sqrt(2h/g)
v=gt=gsqrt(2h/g)=sqrt(2gh)
mgh=mv²/2
v=sqrt(2gh)
(b) using kinenatics
h=gt²/2 =>sqrt(2h/g)
v=gt=gsqrt(2h/g)=sqrt(2gh)
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