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3 years ago

Which of the following examples illustrates static friction in action?

Physics

2 answers:

Slav-nsk [51]3 years ago

7 0

<h3>Answer;</h3>

D. a car starting to move after the light changes from red to green

<h3>Explanation;</h3>

Static friction is a type of friction or a force that is experienced by a body or a substance at rest. Therefore, when a force is applied on a body or an object at rest it opposes the static friction.
Static friction does not have the ability to move an object or induce motion since it is countered by other strong opposite forces. Static friction must be overcome to cause motion of the object.
When a body or an object is in motion it experiences kinetic friction. Therefore, when a body at rest starts to move then the friction changes to kinetic friction.

lilavasa [31]3 years ago

3 0

I think its d. but im not sure

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Goryan [66]

The momentum of the bus is $3.93\cdot 10^5 kg m/s$

Explanation:

The momentum of an object is given by

$p=mv$

where

m is the mass of the object

v is its velocity

For the bus in this problem, we have

$m=13,500,000 g = 13,500 kg$ is its mass

$v=65 mph \cdot \frac{1609 m/mi}{3600 s/h}=29.1 m/s$ is the velocity, converted into SI units

Substituting into the equation, we find the momentum of the bus:

$p=(13,500)(29.1)=3.93\cdot 10^5 kg m/s$

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zaharov [31]

Answer:

$P_{He}^|=288.85torr$

Explanation:

Given data

$P_{He}=750 torr\\V_{He}=285mL\\P_{Ar}=732 torr\\V_{Ar}=455 mL$

Required

Partial pressure of helium

Solution

First calculate the total volume of gas mixture once the stopcock is opened

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As temperature remains constant,by Boyle's Law we calculate the partial pressure of the helium gas

$P_{He}V_{He}=P_{He}^|V_{total}\\P_{He}^|=\frac{P_{He}V_{He}}{V_{total}}\\P_{He}^|=\frac{750torr*285mL}{740mL}\\ P_{He}^|=288.85torr$

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Rina8888 [55]

this may help you
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