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3 years ago

If two objects are in thermal equilibrium, do they have the same thermal or internal energy?

Physics

1 answer:

Tpy6a [65]3 years ago

7 0

Answer:

Yes, they do have the same internal energy.

Explanation:

The thermal balance refers to when there is no heat transfer between the bodies and their surroundings i.e. the bodies and the environment are at the same temperature.

Suppose two bodies of different masses and different materials, each one of them is at a temperature of 25(° C), which is the same temperature as the temperature of the environment, if these two bodies are close to each other, there is also heat transfer as they are at the same temperature, in the absence of any type of energy that enter or exit in these bodies, the amount of internal energy will be equal in both bodies.

Note: when the internal energy of one of these bodies is increased, heat transfer will happen, always looking for the thermal balance.

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On a vacation flight, you look out the window of the jet and wonder about the forces exerted on the window. Suppose the air outs

Anettt [7]

Answer:

The pressure difference is 25.8kPa while the force exerted on the window by air pressure is 3.02 kN

Explanation:

Using the Bernoulli's equation

$P_{in}+\frac{1}{2}\rho v_{in}^2=P_{out}+\frac{1}{2}\rho v_{out}^2$

Here

Pin-Pout is the pressure difference which is to be calculated.

ρ is the density of air whose value is 1.29 kg/m^3

vin is the velocity of air inside which is 0 m/s

vout is the velocity of air outside which is 200 m/s

Substituting values in the above equation yields

$\Delta P=P_{in}-P_{out}\\\Delta P=\frac{1}{2}\rho (v_{in}^2-v_{out}^2)\\\Delta P=\frac{1}{2}\times 1.29 ( 200^2-0)\\\Delta P=25.8 kPa$

So the pressure difference is 25.8kPa.

As force is given by

$F=PA\\F=\Delta P A\\$

Here

ΔP is the pressure difference calculated above
A is the area of the window given as

$A=L \times W\\A=0.26 \times 0.45\\A=0.117 m^2$

Now force is

$F=\Delta P A\\F=25.8 \tiems 10^3 \times 0.117\\F=3.02 kN$

So the force exerted on the window by air pressure is 3.02 kN

6 0

3 years ago

PLEASE HELP ME!!!

denis-greek [22]

The reason for that is that P-waves (primary waves) travel faster than S-waves (secondary waves).

If we call $v_p$ the speed of the primary waves and $v_s$ the speed of the secondary waves, and we call $S$ the distance of the seismogram from the epicenter, we can write the time the two waves take to reach the seismogram as
$t_P = \frac{S}{v_P}$
$t_S= \frac{S}{v_S}$

So the lag time between the arrival of the P-waves and of the S-waves is
$\Delta t = t_S-t_P= \frac{S}{v_S}- \frac{S}{v_P}= S(\frac{1}{v_S}- \frac{1}{v_P})$
We see that this lag time is proportional to the distance S, therefore the larger the distance, the greater the lag time.

6 0

2 years ago

Edit question A 37-cm-long wire of linear density 18 g/m vibrating at its second mode, excites the third vibrational mode of a t

Pachacha [2.7K]

Answer:

176.9N

Explanation:

The following data were given

wire length,L=37cm=0.37m

linear density=18g/m

tube length,=192cm=1.92m,

speed of sound,v=343m/s

Since it is an open-closed tube, the second harmonic frequency is expressed as

$f_{3}=3(\frac{v}{4l} )\\f_{3}=3(\frac{343}{4*1.92})\\f_{3}=133.98Hz$

The relationship between the tension, linear density and second harmonic frequency is expressed as

$f_{3}=\frac{1}{2l_{w}}\sqrt{\frac{T}{\alpha } } \\T=(f_{3}*2l_{w})^{2}\alpha \\T=(133.984*2*0.37)^{2}*18*10^{-3}\\T=176.9N$

7 0

3 years ago

Wil-E-Coyote drops a bowling ball off a cliff to try to catch the Roadrunner. The cliff is 132m high. how far does it fall in th

Ksivusya [100]

197m because 132+3.0=197x

4 0

3 years ago

Which career is most concerned with the study of radioactive isotopes?

leonid [27]

<span>The career that is most concerned with the study of radioactive isotopes is chemistry. You need to have passed AP chemistry to actually deal with the isotopes. In a quick reference, isotopes are when the atom has difference amount of neutrons, making the atomic mass differ.</span>

3 0

3 years ago