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pshichka [43]
3 years ago
15

You are 15.0m from the source of a sound. At that distance, you hear it at a sound level of 20.0dB. How close must you move to t

he sound to increase the sound level to 60dB?
I think its 45.0cm?

15.0cm
45.0cm
55.0cm
60.0cm
85.0cm
Physics
2 answers:
Andrej [43]3 years ago
5 0
The answer is 45.0cm
USPshnik [31]3 years ago
4 0

Answer:

Explanation:

its 85 cm because it just is in meters it would be .8m  which would be decent distance to hear it

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Three heavy rods are all made of the same uniform material. These rods have lengths 3 m, 4 m, and 5 m, and compose the sides of
Sonbull [250]

Answer:

[ 2.67 , 1 ] m

Explanation:

Given:-

- The side lengths of the rods are as follows:

                             a = 4 m , b = 4 m , c = 5 m

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Find:-

Find the coordinates of the center of mass of the triangle.

Solution:-

- The center of mass of any triangle is at the intersection of its medians.

- So let’s say we have a triangle with vertices at points (0,0) , (a,0) , and (0,b).

  • Median from (0,0) to midpoint (a/2,b/2) of opposite side has equation:

                                       bx−ay=0

  • Median from (a,0) to midpoint (0,b/2) of opposite side has equation:

                                      bx+2ay=ab

  • Median from (0,b) to midpoint (a/2,0) of opposite side has equation:

                                     2bx+ay=ab

  • Solve all three equations simultaneously:

                                     bx−ay=0  , bx = ay

                                     ay + 2ay = ab , 3ay = ab , y = b/3

                                     bx = b/3

                                     x = a / 3

  • So the distance from the median to each leg of the triangle is 1/3 length of other leg.

- So the coordinates of the centroid for right angle triangle would be:

                                   [ 2a/3 , b/3 ]

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