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3 years ago

15

The forces acting on a child sitting in a seat are described by the free-body diagram shown.

2 answers:

Vanyuwa [196]3 years ago

6 0

B, there is no net force because the object is not moving

melisa1 [442]3 years ago

4 0

Answer:

B.0 N

Explanation:

Based on the description of the free-body diagram, there are only two forces acting on the child sitting on the seat:

- The force of gravity, Fg=-100 N, in the downward direction

- The normal reaction of the chair on the child, Fn=100 N, in the upward direction

The two forces have same magnitude but in opposite directions, so the net force (resultant of the two forces) is zero:

$F_{net}=F_n+F_g=100 N-100 N=0 N$

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3 years ago

Light is incident on the left face of an isosceles prism; with an apex angle of 49o, such that the light exiting the right face

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Explanation:

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now on the other surface we know that

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3 years ago

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4 years ago

Two containers (A and B) are in thermal contact with an environment at temperature T = 280 K. The two containers are connected b

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Answer:

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From the question we are told that

The temperature of the environment is $T = 280\ K$

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Initially the number of moles is $n = 1.2 \ moles$

The volume of container B is $V_B = 3.5 \ m^3$

At equilibrium of the gas the maximum work that can be done on the turbine is mathematically represented as

$W = P_A V_A ln[ \frac{V_B}{V_A} ]$

Now from the Ideal gas law

$P_A V_A = nRT$

So substituting for $P_A V_A$ in the equation above

$W = nRT ln [\frac{V_B}{V_A} ]$

Where R is the gas constant with a values of $R = 8.314 \ J/mol$

Substituting values we have that

$W = 1.2 * (8.314) * (280) * ln [\frac{3.5}{2} ]$

$W = 1563.289 \ J$

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