Answer:
30 cm
Explanation:
From the principle of moment,
when a body is in equilibrium,
Sum of clock wise moment = sum of anti clock wise moment.
Note: That before Doug hangs the last mass, The clock wise moment is greater than the anti close wise moment.
As such the third mass will be placed before the knife edge. As shown in figure 1 on the attached file.
From the diagram,
W₁(50-30) + W₃(x-50) = W₂(80-50)
were, W₁ = m₁g = 0.4×9.8 = 3.92 N ( Where m₁ = 0.4 kg and g = 9.8 m/s²)
W₂ = m₂g =0.6×9.8 = 5.88 N ( where m₂ = 0.6 kg)
W₃ = m₃g = 0.3×9.8 = 2.94 N ( where m₃ = 0.3 kg)
Therefore,
3.92(30) + 2.94(50-x) = 5.88(30)
117.6 + 147-2.94x = 176.4
2.94x+264.6 = 176.4
-2.94x = 176.4-264.6
2.94x = 88.2
x = -88.2/-2.94
x = 30 cm
Thus the third mass must be hung 30 cm
Answer:
23.0 s
Explanation:
Given:
v₀ = 0 m/s
v = 19.8 m/s
a = 4.80 m/s²
Find: Δx and t
v² = v₀² + 2aΔx
(19.8 m/s)² = (0 m/s)² + 2 (4.80 m/s²) Δx
Δx = 40.84 m
v = at + v₀
19.8 m/s = (4.80 m/s²) t + 0 m/s
t = 4.125 s
The elevator takes 40.84 m and 4.125 s to accelerate, and therefore also 40.84 m and 4.125 s to decelerate.
That leaves 291.3 m to travel at top speed. The time it takes is:
291.3 m / (19.8 m/s) = 14.71 s
The total time is 4.125 s + 14.71 s + 4.125 s = 23.0 s.
Answer:
A. The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.
Explanation:
I took the quiz and I put this answer and I got a 100%.
Chemical properties are observed when matter or substance changes to form a new kind of matter or substance.
<h3>What is Chemical properties?</h3>
This is the term used to describe the ability of a substance or matter to react and form new substance. Chemical properties are used during chemical reaction to be able to control the reaction and get a certain product
we can conclude that chemical properties are observes during chemical reaction to ascertain the new substance or matter to be formed
Read more on chemical properties here: brainly.com/question/17436856
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Kinetic energy is due to motion and body has potential energy because of its position
so potential energy is firewoods and beans
kinetic energy is
moving water hiking and flames