What are three examples of noncontact forces
1 answer:
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Answer:
Explanation:
Given that,
h(t) = -9.8t² / 2 + 125t + 500
for t > 0.
At t = 0, the rocket is at height h = 500m, at a velocity of Vo = 125m/s.
We want to find the maximum height reached by rocket
Using mathematics maxima and minima
let find the turning point when dh/dt = 0
dh/dt = -9.8t + 125
dh / dt = 0 = -9.8t + 125
9.8t = 125
t = 125 / 9.8
t = 12.76s
Let find the turning point to know if this time t = 12.76 is maximum or minimum point
Let find d²h / dt²
d²h / dt² = -9.8
Since, d²h/dt² < 0, then, at t = 12.76s is the maximum points.
Then, the maximum height reached is
h = -9.8t² / 2 + 125t + 500
h = -9.8(12.76)² / 2 + 125(12.76) + 500
h = -797.80 + 1595 + 500
h = 1297.2 m
The maximum height reached is 1297.2 m
From the attachment, the maximum height is 1297.2m at t = 12.76sec.
Comment, the result are the same for both the analysis aspect and the graphical aspect.
The equilibrium condition allows finding the correct answer for the force that is resisting the weight of the apple is:
3. Normal force
Newton's second law gives the relationship between <em>force, mass</em> and acceleration of bodies, in the special case that the acceleration is is called the equilibrium condition.
∑ F = 0
Where F is the external force.
The free body diagram is a diagram of the forces on bodies without the details of the shape of the body, in the attached we can see a scheme of the forces.
Let's write the equilibrium condition for the apple
N - W = 0
N = W
.
We can see that the only forces acting on the apple are its weights and reaction from the table called Normal.
Let's analyze the different answers:
1. False. The apple is not moving therefore the resistance is zero
2. False. The apple is not moving so friction it with the table is
3. True. The free-body diagram shows that the normal and the weight are equal
4. False. There is nothing to pull the apple so there is no tension
5. False. Gravity is the weight of the apple that is applied to the table, not from the table to the apple.
In conclusion using the equilibrium condition we can find the correct result for the force that is resisting the weight of the apple is:
3. Normal force
Learn more here: brainly.com/question/2872207
