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3 years ago

What does it mean to say that wolves are social creatures

Physics

1 answer:

Marizza181 [45]3 years ago

5 0

They interact with one another with their facial expressions and body movements all the time

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An unknown substance from planet X has a density of 10 g/mL. It occupies a volume of 80 mL. What is the mass of this unknown sub

asambeis [7]

Answer:

800 mL

Explanation:

D*V=M

You pick out the numbers as well as what it is they represent from the word problem/explanation, then from there plug them in to the equations. Once you do that, you get your product and have the answer.

10*80= 800

5 0

3 years ago

Problem 3.2 Part A Draw the vector C⃗ =A⃗ +B⃗ .(Figure 1)

Elodia [21]

I can't answer this question without a figure. I've found a similar problem as shown in the first picture attached. When adding vectors, you don't have to add the magnitudes only, because vectors also have to factor in the directions. To find the resultant vector C, connect the end tails of the individual vectors. <em>The red line (second picture) represents the vector C.</em>

5 0

3 years ago

Please choose the answer that describes the scientific notation for 5,098,000.

galben [10]

D. 5.098 x 106 is the correct answer when reduced to the proper notation.

3 0

3 years ago

An internal explosion breaks an object, initially at rest, into two pieces, one of which has 1.3 times the mass of the other. If

hoa [83]

Answer:

k_2 =3826.08 J

K_1 = 4973.91 J

Explanation:

from conservation of momentum principle

$0 = m_1v_1+m_2v_2$

we know that kinetic energy is given as

$k_1 = \frac{1}{2} m_1v_1^2$

$k_2 = \frac{1}{2} m_2v_2^2$

we have $v_1 =-1.3v_2$ , $m_2 = 1.3m_1$

therefore $k_1 =\frac{1}{2} (\frac{m_2}{1.3})(-1.3v_2)^2 = 1.3k_2$

now

$k_1+k_2 = 8800$

$1.3k_2 +k_2 =8800$

k_2 =3826.08 J

K_1 = 4973.91 J

3 0

4 years ago

Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the p

Dennis_Churaev [7]

Answer:

$5.87*10^{-4}W$

Explanation:

Given that:

$\beta = 89,6 dB$

$D = 13.0 cm$

$r = \frac{D}{2}\\ = \frac{13.0}{2}\\ = 6.5 cm\\=0.065m$

Efficiency = 2.06 % = 0.0206

The intensity level of sound is given by the formula:

$\beta = (10dB) log (\frac{I}{I_o} )$

$\frac{\beta}{(10dB) } =log (\frac{I}{I_o} )$

Taking their exponential; we have :

$10^{\frac{\beta}{10dB}}= \frac{I}{I_o}$

$I = I_o(10^{\frac{\beta}{10dB}})$

Replacing our values; we have:

$I = (10^{-12}W/m^2)(10^{\frac{89.6}{10dB}})$

$= 9.12 *10^{-4}W/m^2$

Power Output;

$P_{out} = IA\\P_{out}=I(\pi r^2)\\P_{out}=(9.12*10^{-4}W/m^2)(3.14)(0.065m)^2\\P_{out}=1.2099048*10^{-5} W$

The power output that is required to produce a 89.6 dB sound intensity level for a 13.0 cm diameter speaker that has an efficiency of 2.06% is;

$P_{in}= \frac{P_{out}}{0.0206}$

$P_{in}= \frac{{1.2099048*10^{-5}}}{0.0206}$

$P_{in}= 5.87*10^{-4}W$

Therefore, The power output that is required to produce a 89.6 dB sound intensity level for a 13.0 cm diameter speaker that has an efficiency of 2.06% is $5.87*10^{-4}W$

8 0

3 years ago