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3 years ago

If a distance-time graph contains the point (4, 15), what does that tell you about the runner?

Physics

1 answer:

serg [7]3 years ago

5 0

Explanation:

It is given that there is distance time graph. The slope of any distance time graph will give the speed or velocity of the object.

In the context, it is seen that there is a point in the distance - time graph. And the values of the point in the graph is (4,15).

Now here, the distance is plotted in the ordinate or the vertical y-axis while time is plotted in the abscissa or the horizontal x-axis.

Thus the point (4,15) tells us that the object has traveled 15 units in time equal to 4 seconds.

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Two workers are sliding 350 kgkg crate across the floor. One worker pushes forward on the crate with a force of 390 NN while the

svetoff [14.1K]

Answer:

$\mu_k=0.18$

Explanation:

First, we write the equations of motion for each axis. Since the crate is sliding with constant speed, its acceleration is zero. Then, we have:

$x: T+F-f_k=0\\\\y:N-mg=0$

Where T is the tension in the rope, F is the force exerted by the first worker, f_k is the frictional force, N is the normal force and mg is the weight of the crate.

Since $f_k=\mu_k N$ and $N=mg$ , we can rewrite the first equation as:

$T+F-\mu_k mg=0$

Now, we solve for $\mu_k$ and calculate it:

$\mu_k=\frac{T+F}{mg}\\ \\\mu_k =\frac{220N+390N}{(350kg)(9.8m/s^{2})} =0.18$

This means that the crate's coefficient of kinetic friction on the floor is 0.18.

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4 years ago

Flow around curved height contours requires the incorporation of the centrifugal force. What is the general term to describe the

lilavasa [31]

Answer: Gradient Wind

Explanation:

Gradient wind, is the wind that accounts for air flow along a curved trajectory. It is an extension of the concept of geostrophic wind; for example the wind assumed to move along straight and parallel isobars (lines of equal pressure). The gradient wind represents the actual wind better than the geostrophic wind, especially when both wind speed and trajectory curvature are large, because they are in hurricanes and jet streams.

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3 years ago

Venn diagrams are used for comparing and contrasting topics. The overlapping sections show characteristics that the topics have

tangare [24]

Answer:

Carry energy and follow a pattern

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3 years ago

Read 2 more answers

Describe three common issues that affect societies across places and times

Vesna [10]

Poverty, Natural Disaster, and Disease are 3 answers.

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3 years ago

A 2000 kg car has a 40000 J of kinetic energy. How fast is it moving?

Lera25 [3.4K]

Answer:

6.32 m/s

Explanation:

KE = 1/2 m v^2

sqrt (2 * KE /m) = v = 6.32 m/s

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2 years ago