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3 years ago

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If forces acting on an object are unbalanced, which factor may result from an unbalanced force? A.The net force is negative. B.T

here is zero net force. C.The forces cancel each other out. D.There is no change in motion.

2 answers:

kolbaska11 [484]3 years ago

5 0

Answer:

<h2>#A</h2>

Explanation:

bezimeni [28]3 years ago

4 0

Answer:

<h2>A. The net force is negative.</h2>

Explanation:

just took the test :)

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Ciner forms when there is a series of violent and gentle eruptions resulting in layering of lava and ash

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This is what occurs when matter transitions between solid, liquid and gas.

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The answer is Phase Change

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What is the specific enthalpy of benzene vapor at 45 c and 0.7 atm absolute pressure, relative to a reference state of benzene v

vazorg [7]

The specific enthalpy of benzene vapor at 45 c and 0.7 atm absolute pressure, relative to a reference state of benzene vapor at 45 c and 1.27 atm absolute pressure will be 0 kJ/mol.

<h3>What is specific enthalpy and how was it calculated in the question?</h3>

A thermodynamic system has a property called enthalpy (H). It is calculated by the sum of the internal energy (U) of the thermodynamic system and the product of its volume (V) and pressure (p). The SI Unit is Joule (J).

Equation:

H = U+pV

The specific enthalpy of vapor can be defined as the amount of energy spent in order to transform a liquid substance into its vapor or gaseous form. The SI Unit is kJ/mol.

In the above question, the formula to be used is

P1/P2 = (Δ Hvap)/R)(1/T2-1/T1)

T1 & P1 --> the starting temperature & pressure respectively (= 1.27 atm and 45c),

T2 & P2 --> the final temperature & pressure respectively (= 0.7 atm and 45c),

R --> the real gas constant i.e. 8.314kJ/mol and

ΔHvap --> The specific enthalpy of vaporization.

Putting the values in the equation;

1.27/0.7=(ΔHvap/8.314)(1/45-1/45)

Hence as after subtracting the equation becomes 0, our final answer also comes out to be ΔHvap= 0 kJ/mol.

To know more about specific enthalpy, visit:

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2 years ago

According to the first rule, if a force pulls on one end of a rope, the tension in the rope equals the magnitude of the pulling

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Answer:

F.

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Here in the question the mass of the pulley is zero, hence, the tension in the cable throughout is same.

magnitude of tension in rope 1 is

T1= F

Hence the tension T1 is rope 1 is F.

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A 60-watt light bulb has a voltage of 120 bolts applied across it and a current of 0.5 amperes flows through the bulb. What is t

Andre45 [30]

Answer:

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Explanation:

From Ohms law we deduce that V=IR and making R the subject of the formula then R=V/I where R is resistance, I is current and V is coltage across. Substituting 120 V for V and 0.5 A for A then

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Alternatively, resistance is equal to voltage squared divided by watts hence $\frac {120^{2}}{60}=240$

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