Answer:
625000 N/ m
Explanation:
m= 20 kg
v= 30 m/s
x= 12 cm
k = ?
Here when the mass when hits at spring its speed is
Vi= 30 m/s
Finally it comes to rest after compressing for 12 cm
i-e Vf = 0 m/s
Distance= S= 12 cm = 0.12 m
using
2aS= Vf2 - Vi2
==> 2a ×0.12 = o- 30 × 30
==> a = 900 ÷ 0.24 = 3750 m/sec2
Now we know;
F = ma
F= -Kx
==> ma= -kx
==> 20 × 3750 = -K × 0.12
==> k = 625000 N/ m
Answer:

Explanation:
The moment of inertia of the system is equal to the each population and the platform inertia so
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The Inertia of the system is the sum of each mass taking into account that all exert the force of inertia:



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Plug in the given mass and velocity into the equation:


Answer:
'A' is the the point on the graph that shows a temperature of 40°C and the time of 25 minutes