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Anton [14]
3 years ago
5

A race car travels 765 km around a circular sprint track of radius 1.263 km. How many times did it go around the track?

Physics
1 answer:
sladkih [1.3K]3 years ago
4 0

Answer:

It will go 96 times around the track.

Explanation:

Given that,

Distance covered by the race car, d = 765 km

Radius of the circular sprint track, r = 1.263 km

Let n times did it go around the track. It is given by :

n=\dfrac{d}{C}

C is the circumference of the circular path, C=2\pi r

n=\dfrac{d}{2\pi r}

n=\dfrac{765}{2\pi \times 1.263}

n=96.4

Approximately, n = 96

So, it will go 96 times around the track. Hence, this is the required solution.

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3 years ago
An output gear has 10 teeth and an input gear has 40 teeth. What is the mechanical advantage of gear combination? Is force or sp
yKpoI14uk [10]

Answer:

Mechanical advantage: 4. Speed is multiplied

Explanation:

The mechanical advantage of gear combination is

MA = \frac{N_i}{N_o}

where

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Here we have

N_i = 40\\N_o = 10

So we find

MA = \frac{40}{10}=4

In this example, it is the speed to be multiplied: the speed of the output gear is 4 times larger than the speed of the input gear. In fact, the mechanical advantage can be rewritten as

MA= \frac{\omega_o}{\omega_i}

where

\omega_i is the angular speed of the input gear

\omega_o is angular speed of the output gear

So re-arranging the equation, we find

\omega_o = MA \cdot \omega_i = 4 \omega_i

so, the speed of the output gear is 4 times larger than the speed of the input gear.

7 0
3 years ago
Briefly explain why small-angle grain boundaries are not as effective in interfering with the slip process as are high-angle gra
artcher [175]

Answer:

Compared to High angle, relatively less presence of Crystallographic misalignment in grain boundary for small angle is reason behind its less effectiveness in interfering with slip process

Explanation:

Because of relatively much less presence of crystallographic misalignment in grain boundary for small angle, small grain boundaries are not as effective in compare to high angle in interfering with slip process

Less crystallographic misalignment in grain boundary causes not much change in slip direction and therefore interference to slip process is minimal.

8 0
3 years ago
An uncharged capacitor and a resistor are connected in series with a switch and a 12 V battery. At the instant the switch is clo
balu736 [363]

Answer:

V = 12 V

Explanation:

  • Since a capacitor can't change the voltage between its plates  instantaneously, this means that just after the switch is closed, the voltage through the capacitor is zero.
  • So, the current that flows in this moment is the same that would flow in a series circuit with only one resistor connected to the battery.
  • Applying KVL to the circuit (neglecting the presence of the capacitor which can be replaced by a short circuit just after closing the switch), the voltage through the resistor must be equal to the one of the battery, i.e., 12 V.
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3 years ago
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