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hram777 [196]
3 years ago
11

This question is typical on some driver’s license exams: A car moving at 49 km/h skids

Physics
1 answer:
bearhunter [10]3 years ago
3 0

<u>42.5 m </u>far the car would skid with locked brakes at speed of 122.5 km/h.

<u>Explanation</u>:

As per the given question, friction force is constant

A car moving at 49 km/h skids  17 m

\text { So speed } S_{1}=49 \mathrm{km} / \mathrm{h} and

\text { Distance } \mathrm{D}_{1}=17 \mathrm{m}

The car skid with locked brakes at 122.5 km/h "x" distance.

\text { So speed } \mathrm{S}_{2}=122.5 \mathrm{km} / \mathrm{h}

Distance \mathrm{D}_{2}=\text { unknown }(\mathrm{x})

We know that ratio of distance and speed is

\frac{d_{1}}{d_{2}}=\frac{s_{1}}{s_{2}}

\frac{17}{d_{2}}=\frac{49}{122.5}

Cross multiply

d_{2}=\frac{17 \times 122.5}{49}

\mathrm{d}_{2}=\frac{2082.5}{49}

\mathrm{d}_{2}=42.5 \mathrm{m}

The distance skid by the car with locked brakes at speed of 122.5 km/h is <u>42.5 m</u>.

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What is the wavelength of a monochromatic light beam, where the photon energy is 2.70 × 10^−19 J? (h = 6.63 ×10^−34 J⋅s, c = 3.0
SOVA2 [1]

Answer:

Wavelength = 736.67 nm

Explanation:

Given

Energy of the photon = 2.70 × 10⁻¹⁹ J

Considering:

Energy=h\times frequency

where, h is Plank's constant having value as 6.63 x 10⁻³⁴ J.s

The relation between frequency and wavelength is shown below as:

c = frequency × Wavelength

Where, c is the speed of light having value = 3×10⁸ m/s

So, Frequency is:

Frequency = c / Wavelength

So,  Formula for energy:

Energy=h\times \frac {c}{\lambda}

Energy = 2.70 × 10⁻¹⁹ J

c = 3×10⁸ m/s

h = 6.63 x 10⁻³⁴ J.s

Thus, applying in the formula:

2.70\times 10^{-19}=6.63\times 10^{-34}\times \frac {3\times 10^8}{\lambda}

Wavelength = 736.67 × 10⁻⁹ m

1 nm = 10⁻⁹ m

So,

<u>Wavelength = 736.67 nm</u>

8 0
3 years ago
g a horizontal wheel of radius is rotating about a vertical axis. What is the magnitude of the resultant acceleration of a bug t
mihalych1998 [28]

Answer:

   a = w² r

Explanation:

In this exercise, indicate that the wheel has angular velocity w, the worm experiences the same angular velocity if it does not move, and has an acceleration towards the center of the circle, according to Newton's second law, called the centripetal acceleration.

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we substitute

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3 years ago
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alukav5142 [94]

Answer:

600Hz

Explanation:

In electrical systems of alternating current, the harmonics are, as in acoustics, frequencies multiples of the fundamental working frequency of the system and whose amplitude decreases as the multiple increases. For example, if we have systems fed by the 50 Hz network, harmonics of 100, 150, 200, etc. may appear.

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4 years ago
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Answer:

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Explanation:

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We can calculate the current by solving for I:

\displaystyle I=\frac{V}{R}=\frac{3}{3}=1\ A

The current is 1 A

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3 years ago
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