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lawyer [7]
3 years ago
13

PLEASE HELP ME!

Physics
2 answers:
Maru [420]3 years ago
7 0

a cornea that isnt curved enough is the answer

pantera1 [17]3 years ago
4 0
A cornea that is not curved enough would be a common cause.
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Answer:

KE = 10530 J or 10.53 KJ

Explanation:

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Let's apply the formula:

KE = 1/2 mv^2

KE = 1/2 (65kg) (18m/s)^2

KE = 10530 J or 10.53 KJ

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Two arrows are shot vertically upward. the second arrow is shot after the first one, but while the first is still on its way up.
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How much total surface of the moon is illuminated by the sun when it is at quarter phase?
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3 0
2 years ago
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Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a
blagie [28]

Answer:

The maximum speed at which the car can safety travel around the track is 18.6m/s.

Explanation:

Since the car is in circular motion, there has to be a centripetal force F_c. In this case, the only force that applies for that is the static frictional force f_sbetween the tires and the track. Then, we can write that:

f_s=F_c

And since f_s\leq \mu N and F_c=\frac{mv^{2}}{r}, we have:

\mu N\geq \frac{mv^{2}}{r}

Now, if we write the vertical equation of motion of the car (in which there are only the weight and the normal force), we obtain:

N-mg=0\\\\\\implies N=mg

Substituting this expression for N and solving for v, we get:

\mu mg\geq \frac{mv^{2}}{r}\\\\v\leq \sqrt{\mu gr}

Finally, plugging in the given values for the coefficient of friction and the radius of the track, we have:

v\leq \sqrt{(0.42)(9.81m/s^{2})(84.0m)}\\\\v\leq 18.6m/s

It means that in its maximum value, the speed of the car is equal to 18.6m/s.

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2 years ago
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