If a 42kg rolling object slows from 11.5m/s to 3.33m/s how much work did friction do
1 answer:
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Answer:
Explanation:
Because we assume the pendulum is a "mathematical pendulum" (neglecting the moment of inertia of the bob), we can find:
By using the
The mean position is the position when <em>y</em> = 0, so:
rad/s
and in centimeters (cm).
Answer:
The mass of the child + skateboard is 50 kg
Explanation:
In this problem, we can apply Newton's second law:
F = ma
where
F is the net force on a system
m is the mass of the system
a is the acceleration of the system
In this problem, our system is the child + the skateboard. The net force on them is
F = 75 N
and their acceleration is
So we can re-arrange the equation above to find their combined mass: