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LekaFEV [45]
3 years ago
14

Bernie is driving down a highway at 28m/s. When bernie approaches a stop light, he presses on his brakes to bring his car to a s

top at a constant rate of acceleration. how come bernie decrease the impulse he experiences as his car comes to a stop?
A. he could decelerate over a shorter distance
B. he could decelerate over a shorter period of time
C. he could accelerate to 30m/s before braking
D. he could apply his brakes over a longer period of time
Physics
1 answer:
coldgirl [10]3 years ago
4 0

Answer:

Explanation:B

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A Ferris wheel with 60 spokes has a diameter of 100 m. It makes one rotation every 60 seconds. Find the speed of the passengers
Doss [256]

Answer:

<em>The speed of the passengers is 5.24 m/s</em>

Explanation:

<u>Uniform Circular Motion </u>

It occurs when an object in a circular path travels equal angles in equal times.

The angular speed can be calculated in two different ways:

\displaystyle \omega=\frac{v}{r}

Where:

v = tangential speed

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Also:

\omega=2\pi f

Where:

f = frequency

Since the frequency is calculated when the number of revolutions n and the time t are known:

\displaystyle f=\frac{n}{t}

The Ferris wheel has a diameter of 100 m and makes n=1 rotation in t=60 seconds, thus the frequency is:

\displaystyle f=\frac{1}{60}\ Hz

The angular speed is:

\displaystyle \omega=2\pi \frac{1}{60} =\frac{\pi}{30} \ rad/s

Now we calculate the tangential speed, solving this formula for v:

\displaystyle \omega=\frac{v}{r}

v=\omega . r

The radius is half the diameter, r=100/2=50 m:

\displaystyle v=\frac{\pi}{30} . 50

Calculating:

v = 5.24 m/s

The speed of the passengers is 5.24 m/s

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