What is the acceleration of a skier that goes from 2.50 m/s to 14.5 m/s while traveling 505 m down a slope?

Physics

1 answer:

Alik [6]3 years ago

3 0

Answer:

493 m*m/s

Explanation:

14.5-2.50=12

505 x 12=493

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a car traveling at 28 m/s slows down at a constant rate for 4 seconds until it stops. what is its acceleration?

astra-53 [7]

We are given the following conditions:
$v_{0} = 28m/s

t = 4s

v_{f} = 0m/s$

Since we are told it slows down at a constant rate, we know we are dealing with uniformed accelerated motion, or UAM for short.

So we look at our kinematics equation that contains the given variables.

$v_f = v_0 + at$

This contains our target variable and our initial conditions. Plug and chug, we get:

$(0m/s) = (28m/s) + a(4s) -28m/s = (4s)*a a = -7m/s^2$

Thus the answer is:

a = -7m/s^2

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3 years ago

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The index of refraction of a clear plastic is listed as 1.89 in the book, but you measured the angle of incidence 63.5° and the

lakkis [162]

Answer:

<h2>index of refraction = 1.69</h2><h2>percentage error = 10.58%</h2>

Explanation:

According to Snell's law, the ratio of the sine of angle of incidence to the sine of angle of refraction is a constant for a given pair of media. The constant is known as the refractive index.

Mathematically $\frac{sin i}{sin r} = n$

i = angle of incidence measured = 63.5°

r = angle of refraction measured = 32°

n = refractive index

$n = \frac{sin 63.5^{0} }{sin 32^{0} } \\n = \frac{0.8949}{0.5299}\\ n = 1.69$

The index fraction calculated is approx. 1.69.

If the index of refraction of a clear plastic as listed in the book is 1.89 and the calculated is 1.69, the percentage error will be calculated as thus;

%error = $\frac{1.89-1.69}{1.89} * 100$