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Simora [160]
3 years ago
13

In order to waken a sleeping child, the volume on an alarm clock is doubled. Under this new scenario, how much more energy will

be striking the child's ear drums each second?
Physics
1 answer:
Kamila [148]3 years ago
5 0

Answer:4 times more energy will be striking the childbearing

Explanation:

Because Volume is directly proportional to amplitude of sound. Energy is proportional to amplitude squared. If you triple the amplitude, you multiply the energy by 4

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I throw a stone off a cliff 32 feet above the water.  The height of the stone in terms of time (in seconds) is given by h(t) = -
devlian [24]
<span>Your equation for the height of the stone at any time is   h(t) = -16t2<span> + 128t + 32 .

From your equation, we can tell that you're defining the upward direction as
positive.  We can also tell that you threw the stone upward, with an initial speed
as it left your hand of 128 feet per second, about 87 miles per hour ... a mighty toss indeed, and I think there's a man from the Chicago Cubs waiting outside
who'd like to talk to you.

Anyway, When the stone splashes into the water,  h(t) = 0 .
</span></span>
<span>-16t²<span> + 128t + 32 = 0</span></span>

Divide each side by -16 :

t² - 8t - 2 = 0

I don't see any easy way to factor the expression on the left,
so I have to use the quadratic formula to solve this equation.

t = 4 plus and minus √18 .

t = +8.24 seconds
t = -0.24 second

Mathematically, both numbers are valid solutions.But when you apply
the equation to a real world situation, only the positive 't' makes sense.
So  <u> t = 8.24 seconds</u>.
5 0
3 years ago
You walk 100m due north. You then turn and walk 55m due east. You then make another turn and walk 12m due south. What is the res
lord [1]

Answer:

Explanation:

Important here is to know that due north is a 90 degree angle, due east is a 0 degree angle, and due south is a 270 degree angle. Then we find the x and y components of each part of this journey using the sin and cos of the angles multiplied by each magnitude:

A_x=100cos90\\A_x=0\\B_x=55cos0\\B_x=55\\C_x=12cos270\\C_x=55

Add them all together to get the x component of the resultant vector, V:

V_x=55

Do the same to find the y components of the part of this journey:

A_y=100sin90\\A_y=100\\B_y=55sin0\\B_y=0\\C_y=12sin270\\C_y=-12

Add them together to get the y component of the resultant vector, V:

V_y=88

One thing of import to note is that both of these components are positive, so the resultant angle lies in QI.

We find the final magnitude:

V_{mag}=\sqrt{55^2+88^2} and, rounding to 2 sig dig's as needed:

V_{mag}= 1.0 × 10² m; now for the direction:

\theta=tan^{-1}(\frac{88}{55})= 58°

7 0
2 years ago
Magnesium oxide is a binary ionic compound. From its formula, MgO, how do you know that Mg is the metal?
Elanso [62]
Because of the location of Mg on the periodic table.
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In a transverse wave, ____________________ is measured from crest to crest or from trough to trough.
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The blank is wavelength
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Approximately how far is the sun from the center of the milky way galaxy?
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The sun is approximately 27,000 light years away from the center of our galaxy.
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