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3 years ago

What represents acceleration on a velocity vs. time graph

1 answer:

8 0

What represents acceleration on a velocity time graph is THE SLOPE OF THE GRAPH.
The slope of a velocity time graph represent the acceleration of the object, that is, the value of the slope at a particular time represent the acceleration of the object at that point in time.

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A spring with a mass attached to it is stretched from the rest position of 20 cm to the position of 87 cm. If the spring constan

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Answer:

388.07 J

Explanation:

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3 years ago

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1. What could scientists learn by using the Law of Superposition?

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Answer C. 1.scientists learn by using the law of superposition B

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3 years ago

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Why does a heavier object fall faster

Salsk061 [2.6K]

Explanation:

In a vacuum (no air resistance), it doesn't. All falling objects, regardless of mass, accelerate at the same rate.

However, when air resistance is taken into account, heavier objects indeed fall faster than lighter objects, provided they have the same shape and size. For example, a lead ball falls faster than a styrofoam ball.

To understand why, first look at what factors affect air resistance:

D = ½ρv²CA

where ρ is air density,

v is velocity,

C is drag coefficient,

and A is cross sectional area.

As falling objects accelerate, they eventually reach a maximum velocity where air resistance equals weight. This is called terminal velocity.

D = W

½ρv²CA = mg

v = √(2mg/(ρCA))

If we increase m while holding everything else constant, v increases. So two objects with the same size and shape but different masses will have different terminal velocities, with the heavier object falling faster.

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3 years ago

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What are the first two steps for finding the magnitude of the resultant vector?

Marina86 [1]

Answer:

In the analytical method,

Resolve the vectors into the perpendicular components of the Cartesian coordinates.
Calculate the magnitude of the resultant vector using the Pythagoras theorem.

Explanation:

There are two methods to find the magnitude of the resultant vector.
One is the geometrical method and the other one is the analytical method.
In the geometrical method, all the vectors are connected the head to tail with the appropriate magnitude and the resultant vector is obtained by joining the initial point and the final point by a vector in the reverse direction. The magnitude of the resultant vector is given by the length of the line.
In the analytical method, all the vectors are resolved into the perpendicular components.
Using Pythagoras theorem, the magnitude of the resultant vector can be obtained
If A and B are the two vectors forming an angle ∅ between them, then the magnitude of the resultant vector is given by the formula

$R=\sqrt{A^{2}+B^{2}+2ABcos\phi}$

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3 years ago

If the work done is 360 J, and the force used to do the work is applied over a distance of 12 m, what is the value of the force

hoa [83]

The formula for work is $W=Fdcos\theta$ . Plugging in the numbers, you get:
$360=F(12)cos(0)$
$F= \frac{360}{12}$
The answer is 30 N.

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3 years ago

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