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Nonamiya [84]
3 years ago
7

Two particles are at the same point at the same time, moving in the same direction. Particle A has an initial velocity of 7.6 m/

s and an acceleration of 2.6 m/s 2 . Particle B has an initial velocity of 3.4 m/s and an acceleration of 5.8 m/s 2 . At what time will B pass A?
Physics
1 answer:
Fiesta28 [93]3 years ago
8 0

Answer:

2.625 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

For particle A

s=ut+\frac{1}{2}at^2\\\Rightarrow s=7.6\times t+\frac{1}{2}\times 2.6\times t^2\\\Rightarrow s=7.6t+1.3t^2

For particle B

s=ut+\frac{1}{2}at^2\\\Rightarrow s=3.4\times t+\frac{1}{2}\times 5.8\times t^2\\\Rightarrow s=3.4t+2.9t^2

Now, the displacement should be same if they are about to cross each other.

7.6t+1.3t^2=3.4t+2.9t^2\\\Rightarrow 7.6t-3.4t=2.9t^2-1.3t^2\\\Rightarrow 4.2t=1.6t^2\\\Rightarrow t=\frac{4.2}{1.6}\\\Rightarrow t=2.625\ s

At 2.625 seconds the particles would have covered equal distances after which B would pass A.

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The net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N. Details about net force can be found below.

<h3>How to calculate net force?</h3>

The net force of a body can be calculated by multiplying the mass of the body by its acceleration as follows:

Force = mass × acceleration

According to this question, a box with a mass of 8.0 kg is sitting on a frictionless surface and experiences an acceleration of 4.0 m/s2 to the right.

Net force = 8kg × 4m/s²

Net force = 32N

Therefore, the net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N.

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2 years ago
Aunt Jane weights 45 Newtons. What is her mass?
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Answer:

10.116 Pounds/45 newtons = 10.1164024 pounds/force

Explanation:

Divide the newtons by the rate of acceleration, which will give you the mass of the object. The mass will be in kilograms, because a single newton represents the amount of force needed to move one kilogram one meter. For our example, we will divide 10 N by 2 m/s/s, which give us a mass of 5 kg

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A thin partition divides a thermally insulated vessel into a lower compartment of volume V and an upper compartment of volume 2V
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Answer:

1.89mol

Explanation:

The entropy change during free expansion is express as

S_{f}-S_{i}=nRln(\frac{V_{F}}{V_{I}})\\

Where S is the entropy of the system,

            n is the amount of mole

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           V is the volume occupied at the initial and final stage

since the process is n adiabatic free expansion, the entropy of the system is constant. Hence we can re-write the equation as

S=nRln(\frac{V_{F}}{V_{I}})\\

where the  V_{i}=v\\ and V_{f}=2v+v=3v\\

S=17.28J/k\\ and

R=8.314\\

Now if we substitute in values we arrive at

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