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vampirchik [111]
2 years ago
11

A test car travels in a straight line along the x-axis. The graph in the figure shows the car’s position x as a function of time

. At which point is the velocity zero?

Physics
2 answers:
svetlana [45]2 years ago
8 0
If it is s-t graph , point is c
if it is v-t graph , point is e
antiseptic1488 [7]2 years ago
7 0

The instantaneous velocity is zero at point C and G.

Further Explanation:

The velocity of an object in motion at a specific time and at specific point is termed as instantaneous velocity. Along a path of motion the given points can be separated by some finite distance.

Concept:

The expression for the instantaneous velocity is:

\fbox{\begin\\v=\dfrac{{{x_1} - {x_o}}}{{{t_1} - {t_o}}}\end{minispace}}

Here, v is the velocity, {x_o} is the initial position, {x_1} is the final position, {t_1} is the final time and {t_o} is the initial time.

For instantaneous velocity at point A:

Substitute 20\text{ m} for {x_o}, 40\text{ m} for {x_1}, 0\text{ s} for {t_o} and 3\text{ s} for {t_1} in the above equation.

\begin{aligned}\\v&=\frac{{40{\text{ m}}-20{\text{ m}}}}{{3{\text{ s}}-0{\text{ s}}}}\\&=\frac{{20}}{3}{\text{ m/s}}\\&=6.67{\text{ m/s}}\\\end{aligned}

For instantaneous velocity at point B:

Substitute 20\text{ m} for {x_o}, 40\text{ m} for {x_1}, 0\text{ s} for {t_o} and 3\text{ s} for {t_1} in the above equation.

\begin{aligned}\\v&=\frac{{40{\text{ m}}-20{\text{ m}}}}{{3{\text{ s}}-0{\text{ s}}}}\\&=\frac{{20}}{3}{\text{ m/s}}\\&=6.67{\text{ m/s}}\\\end{aligned}

For instantaneous velocity at point C:

Substitute 40\text{ m} for {x_o}, 40\text{ m} for {x_1}, 3\text{ s} for {t_o} and 5\text{ s} for {t_1} in the above equation.

\begin{aligned}v&=\frac{{40{\text{ m}}-40{\text{ m}}}}{{{\text{5 s}}-3{\text{ s}}}}\\&=\frac{{-0{\text{ m}}}}{2}{\text{ m/s}}\\&=0{\text{ m/s}}\\ \end{aligned}

For instantaneous velocity at point D:

Substitute 40\text{ m} for {x_o}, 0\text{ m} for {x_1}, 5\text{ s} for {t_o} and 6\text{ s} for {t_1} in the above equation.

\begin{aligned}v&=\frac{{0{\text{ m}}-40{\text{ m}}}}{{{\text{6 s}}-5{\text{ s}}}}\\&=\frac{{-40{\text{ m}}}}{1}{\text{ m/s}} \\ &=-40{\text{ m/s}}\\ \end{aligned}

For instantaneous velocity at point E:

Substitute 40\text{ m} for {x_o}, 0\text{ m} for {x_1}, 5\text{ s} for {t_o} and 6\text{ s} for {t_1} in the above equation.

\begin{aligned}v&=\frac{{0{\text{ m}}-40{\text{ m}}}}{{{\text{6 s}}-5{\text{ s}}}}\\&=\frac{{-40{\text{ m}}}}{1}{\text{ m/s}}\\&=-40{\text{ m/s}}\\ \end{aligned}

For instantaneous velocity at point F:

Substitute 40\text{ m} for {x_o}, 0\text{ m} for {x_1}, 5\text{ s} for {t_o} and 6\text{ s} for {t_1} in the above equation.

\begin{aligned}v&=\frac{{0{\text{ m}}-40{\text{ m}}}}{{{\text{6 s}}-5{\text{ s}}}}\\&=\frac{{-40{\text{ m}}}}{1}{\text{ m/s}}\\&=-40{\text{ m/s}}\\ \end{aligned}

For instantaneous velocity at point G:

The instantaneous velocity is 0\text{ m/s}, because slope at on the curve at point G is parallel to the time axis.

Therefore, the instantaneous velocity is zero at point C and G.

Learn more:

1. Describe velocity https://brainly.in/question/3480664

2. Average velocity brainly.com/question/190072

3. Difference between speed and velocity

brainly.com/question/2880714

Answer Details:

Grade: Middle school

Subject: Physics

Chapter: Kinematics

Keywords:

Test, car travels, straight, line, x-axis, graph, figure, shows, position, function, time, velocity, zero, point C and G.

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nikitadnepr [17]

The correct answer is: Option (A) 75 J

Explanation:

First, be careful with the units here. As you can see it is mentioned that there is a 50N box. It means that the weight (<em>mg</em>) of the box is given as the unit is <em>Newton</em>, not its mass (which is in kg).

As,

Potential-energy = mass * acceleration-due-to-gravity * height

PE = m*g*h --- (A)


In equation (A), mg is actually the weight of the box, which is given.

mg = 50N

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Plug the values in equation (A):

PE = 50 * 1.5  = <em>75 J (Option A)</em>

3 0
3 years ago
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mart [117]

Answer:  29.50 m

Explanation: In order to calculate the higher accelation to stop a train  without moving the crates inside the wagon which is traveling at constat speed we have to use the second Newton law so that:

f=μ*N the friction force is equal to coefficient of static friction  multiply the normal force (m*g).

f=m.a=μ*N= m*a= μ*m*g= m*a

then

a=μ*g=0.32*9.8m/s^2= 3.14 m/s^2

With this value we can determine the short distance to stop the train

as follows:

x= vo*t- (a/2)* t^2

Vf=0= vo-a*t then t=vo/a

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vfiekz [6]

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wouldn't it be 25 miles?? yeah

Explanation:

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2 years ago
In the example of jumping off a chair, what is the impulse that will stop your fall?
liq [111]

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Explanation:

It common sense you don't want your head injured. Do you?

5 0
3 years ago
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Ivanshal [37]

Answer:

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for molly :

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Explanation:

brainliest plz

8 0
2 years ago
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