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Julli
6 days ago
15

What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800-Hz sound from

its siren? The speed of sound on this day is 345 m/s.
Physics
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"a very light ideal spring stretches by 21.0 cm when it is used to hang a 135-n object. what is the weight of a piece of electro
Keith_Richards [3271]
In the first case, once equilibrium is established,
mg = kx
135 = k(0.21) [Converted to SI units]
k = 135/(0.21)

In the second case, similarly when reaching equilibrium,
mg = kx
mg = [(135)(.449)]/(0.21)
mg = weight of the electronic equipment = approximately 289 N.
6 0
2 months ago
Read 2 more answers
Three equal negative point charges are placed at three of the corners of a square of side d. What is the magnitude of the net el
Ostrovityanka [3204]
<span>this might be useful
Regarding the field, the two charges placed opposite cancel each other out!
Therefore, E = kQ / d² = k * Q / (d/√2)² = 2*k*Q / d² ◄
given k = 8.99×10^9 N·m²/C²,
E = 1.789×10¹⁰ N·m²/C² * Q / d² </span>
8 0
3 months ago
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Richard needs to fly from san diego to halifax, nova scotia and back in order to give an important talk about mathematics. on th
Ostrovityanka [3204]

As the plane heads toward Halifax, the wind speed supports the flight path

resulting in an overall improved speed

Conversely, during the return trip, the wind will resist the plane's motion, decreasing the net speed

The total journey lasts 13 hours

of which 2 hours was dedicated to the mathematics discussion

Consequently, the total flight time is 13 - 2 = 11 hours

Now we apply the formula to calculate the time for traveling to Halifax

t_1 = \frac{d}{v + 50}

Time needed to return

t_2 = \frac{d}{v - 50}

Let’s look at the total time

T = t_1 + t_2

11 = \frac{d}{v - 50} + \frac{d}{v + 50}

Here d = 3000 miles

11 = \frac{3000}{v - 50} + \frac{3000}{v + 50}

3.67 * 10^{-3} = \frac{2v}{v^2 - 2500}

v^2 - 2500 = 545.45v

By solving the derived quadratic equation

v = 550 mph

the plane's speed calculates to 550 mph

3 0
2 months ago
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Although it shouldn’t have happened, on a dive i fail to watch my spg and run out of air. if my buddy is close by, my best optio
Yuliya22 [3333]

Answer:

B ) Ascend using my buddy's alternative air source / perform an emergency swimming ascent

Explanation:

From the details given, it's clear the buddy is nearby and thus the alternative air source can be utilized easily. Furthermore, the diver is closer to the water's surface than their buddy, making a controlled emergency ascent preferred in this situation.

5 0
3 months ago
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What is the factor involved in increasing an object’s inertia?
inna [3103]
Inertia = inactivity
The element that influences an increase in inertia is "mass." The greater the mass of an object, the more inertia it possesses. 
7 0
1 month ago
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