Which of the following is not a force causing plate motion?
2 answers:
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Answer:
The resulting acceleration of the box is 3.92
Explanation:
Please refer to the Free Body Diagram
According to the second Newton's Law, the acceleration of the mass will depend on the net force applied to it.
In the y-axis, the net force is zero since the mass won't move in that direction. We only need to analyze the dynamics on the x-axis.
The problem states that initially, the box moves at a constant speed which means zero acceleration, or zero net force.
If we analyze the forces on the x-axis we find:
F - Fr = m.a
Where F is the originally applied force, Fr is the Friction force, m is the mass of the box and a is the initial acceleration, which we found to be zero. Thus:
F - Fr = 0 => F = Fr = .N, being N the Normal force and
the kinetic friction coefficient
By analyzing the y-axis, we find N = W = m.g
So N = 50 kg. 9.8 = 490 Nw
The Friction force is then:
Fr = 490 Nw . 0.2 = 98 Nw
Which gives us the initial Force:
F = 98 Nw
When tripled, the new Force will be
F' = 294 Nw
And the corresponding x-axis equilibrium condition is:
F' - Fr = m.a' ....(a' is the resulting acceleration). So we have:
a = 3.92
Answer:
<h3>The answer is 0.47 kg</h3>Explanation:
The mass of the object given it's momentum and velocity can be found by using the formula
where
p is the momentum
v is the velocity
We have
We have the final answer as
<h3>0.47 kg</h3>Hope this helps you