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Zepler [3.9K]
3 years ago
5

A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at res

t. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?

Physics
1 answer:
Alex73 [517]3 years ago
3 0

Answer:16m/s

Explanation:

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A concert loudspeaker suspended high off the ground emits 39 w of sound power. a small microphone with a 1.0 cm2 area is 60 m fr
Gelneren [198K]

As we know that intensity of sound is defined as power received per unit area

so here the power of source is given as

P = 39 W

distance of microphone is given as

d = 60 m

now if loudspeaker is considered as spherical source then we will have

Intensity = \frac{power}{area}

Intensity = \frac{39}{4\pi r^2

here

r = d = 60 m

Intensity = \frac{39}{4\pi (60^2)}

Intensity = 0.86 \times 10^{-3} W/m^2

7 0
3 years ago
A speaker generates a continuous tone of 440 Hz. In the drawing, sound travels into a tube that splits into two segments, one lo
chubhunter [2.5K]

Answer:

The minimum difference between the lengths of the two tubes should be 0.385 meters.

Explanation:

As we known that for any two waves to arrive in phase at any point the difference in the path traveled by the waves should be an integral multiple of the wavelength of the wave.

Mathematically we can write:

\Delta x=n\frac{\lambda }{2}

For the given wave we have

\lambda =\frac{v}{\nu }

Applying values we get

\lambda =\frac{339}{440 }=0.77m

Thus the minimum difference in the lengths of the tubes can be obtained by putting the value of n = 1

\therefore \Delta x=1\times \frac{0.77}{2}=0.385m

7 0
3 years ago
Humans obtain energy in a number of different ways. About half of the electrical energy in the U.S. is generated by burning coal
ivanzaharov [21]

Answer:

C. Burning coal tends to harm the environment more than using solar panels.

Explanation:

When coal is burned, it reacts with the oxygen in the air. This reaction converts the stored potential energy, which turns into thermal energy, which is released as heat. But it also produces methane and carbon dioxide which is released into the air.

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The majority of the elements on the periodic table are _______. A. gases B. nonmetals C. metals D. liquids
Paladinen [302]

Option (C) is correct that the majority of the elements on the periodic table are metals.

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3 years ago
Describe two ways unbalanced forces help you in your day to<br> day life.
Alexxandr [17]

Answer:

  1. we need unbalance force to lift objects
  2. we need unbalance force to drag objects
6 0
3 years ago
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