Question

In the figure below, the scale on which the 63 kg physicist stands reads 236 N. How long will the cantaloupe take to reach the floor if the physicist drops it (from rest relative to himself) at a height of 2.1 m above the floor?

How would you go about solving this?

Answer 1

I = P/A = P/4πr² = 100/4π(8)² = 0.12 W•m⁻²
If the sound intensity level is halved to a value of I = 0.06 W•m⁻²,
the sound intensity level will decrease by 3 dB.
I = P/4πr² = 100/4π(x) ² =
=0.06 W•m⁻²
x = 11.5 m from the speaker.

Answer 2

F=mg
g=F/m=236/63=3.746 m/s²

h=gt²/2
t=sqrt(2h/g)=sqrt(2•2.1/3.746)=1.06 s.

Answer 3

It says that the answer isn't right. I already tried using the same method. Thanks though!