Please help me with a physics question

Physics

1 answer:

Oliga [24]3 years ago

8 0

Answer:

I could swear I just answered this question

Centripetal force is the force that keeps the yoyo going in a circle, if the string breaks, the yoyo would would fly off in a direction that is different to the point on the circle.

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Comets travel in orbits around the Sun. Some comets take less than 200 years to orbit the Sun. They are called short-period come

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3 years ago

Which of the following was not first proposed by Charles Darwin?

ira [324]

Answer:

C. Struggle for existence

Explanation:

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3 years ago

Which statement best describes the motion of an object that is being subjected to two forces of equal magnitude in opposite dire

Ludmilka [50]

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4 years ago

When exiting the highway, a 1100-kg car is traveling at 22 m/s. The car's kinetic energy decreases by 1.4×105J The exit's speed

Vesna [10]

I think you want to determine the exit speed?

You have to determine how much velocity was decreased by calculating it from the kinetic energy.

KE = (1/2)mv²
1.4 x 10^5 = (1/2)*(1100)v²
v² = 254.55
v =15.95 m/s

So the velocity reduces by 15.95 m/s. Subtracting this to the initial velocity: 22 - 15.95 = 6.05 m/s.

So, the final speed was 6.05 m/s.

I hope I was able to help :)

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3 years ago

Read 2 more answers

Consider a ball rolling down the decreasing slope inside a semicircular bowl (the slope is steep at the top rim, gets less steep

satela [25.4K]

The answer would be:
It's rate of gaining speed decreases.
The rate at which speed changes is called acceleration,
You can think of this problem as an inclined plane. But the angle of an inclined plane is constantly decreasing.
We know that on a frictionless inclined plane acceleration of an object is:
 $a=gsin(\theta)$
Where g is the gravitational acceleration of the Earth and $\theta$ is the angle of an inclined plane.
Using our analogy, the ball would start on an inclined plane with a 90-degree angle and that angle would continue to decrease to zero.
The sine function is 1 at 90 degrees and is equal to zero at 0 degrees. Since our acceleration is proportional to the sine, and sine function is decreasing with the angle, our acceleration is also decreasing.

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3 years ago