4 years ago

How do you think altering factors like wavelength and frequency affect they way we see and hear?

1 answer:

4 0

<span>Well think about how Pitch often depends on the frequency of a sound wave and that Frequency is the number of wavelengths . Don't forget that a wavelength can equal to 1 compression and 1 rarefaction.</span>

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A hot air balloon is traveling vertically upward at a constant speed of 4.5 m/s. When it is 28 m above the ground, a package is

ella [17]

Answer:

1.97 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0$

Solving the above equation we get

$t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89$

So, the time the package was in the air is 1.97 seconds

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3 years ago

The chances of being involved in a fatal crash is higher at night then during the day

Ierofanga [76]

Indeed because some leave headlights off and ignore that fact since there are street lights around.

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4 years ago

The sum of kinetic energy and potential energy within a system is called

SashulF [63]

Answer:

mechanical energy.

Explanation:

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3 years ago

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The attraction will vary directly with the separation between the charges.

Burka [1]

No it won't. It'll vary inversely as the square of the separation.

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3 years ago

What is the potential energy of a 30 Newton ball that is on the ground

Juli2301 [7.4K]

The potential energy of a 30N ball on the ground will be zero. With respect to height, h. Potential energy will be calculated like this. P=mgh. So if its on the ground relatively speaking the h=0. Thus inputting into the above formula. P=0.

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3 years ago