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goldenfox [79]
3 years ago
6

Kecepatan sebuah benda dinyatakan dengan persamaan vx=8t+2 vy=12+2t, jika posisi awal pastikel (2,5), maka posisi benda pada saa

t t=4s adalah?
Physics
1 answer:
Vlad1618 [11]3 years ago
8 0
X = 2
y = 5

persamaan 1 : vx = 8t + 2 , x = 2 dan t = 0 karena posisi awal
                      2v = 8(0) + 2
                      2v = 2
                       v1 = 1

persamaan 2 : vy = 12 + 2t , y = 5 dan t = 0 karena posisi awal
                     5v = 12 + 2(0)
                     5v = 12
                     v2 = 2,4
masukin pada persamaan t = 4 dengan menggunakan v1 (v pada x) dan v2 (v pada y)
vx = 8t + 2 , t = 4 dan v = 1
1x = 8(4) + 2
x = 32 + 2
x = 34

vy = 12 + 2t , t = 4 dan v = 2,4
2,4y = 12 + 2(4)
2,4y = 20
y = 8,33

maka (x,y) = (34 ; 8,33) pada t = 4

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Answer:

W = - 118.24 J (negative sign shows that work is done on piston)

Explanation:

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\Delta\ U = nC_{v}\Delta\ T

where,

ΔU = Change in internal energy of gas = ?

n = no. of moles of gas = 0.0884 mole

Cv = Molar Specific Heat at constant volume = 5R/2 (for diatomic gases)

Cv = 5(8.314 J/mol.K)/2 = 20.785 J/mol.K

ΔT = Rise in Temperature = 18.8 K

Therefore,

\Delta\ U = (0.0884\ moles)(20.785\ J/mol.K)(18.8\ K)\\\Delta\ U = 34.54\ J

Now, we can apply First Law of Thermodynamics as follows:

\Delta\ Q = \Delta\ U + W

where,

ΔQ = Heat flow = - 83.7 J (negative sign due to outflow)

W = Work done = ?

Therefore,

-83.7\ J = 34.54\ J + W\\W = -83.7\ J - 34.54\ J\\

<u>W = - 118.24 J (negative sign shows that work is done on piston)</u>

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One string of a certain musical instrument is 70.0 cm long and has a mass of 8.79 g . It is being played in a room where the spe
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To solve this problem we will apply the concepts of linear mass density, and the expression of the wavelength with which we can find the frequency of the string. With these values it will be possible to find the voltage value. Later we will apply concepts related to harmonic waves in order to find the fundamental frequency.

The linear mass density is given as,

\mu = \frac{m}{l}

\mu = \frac{8.79*10^{-3}}{70*10^{-2}}

\mu = 0.01255kg/m

The expression for the wavelength of the standing wave for the second overtone is

\lambda = \frac{2}{3} l

Replacing we have

\lambda = \frac{2}{3} (70*10^{-2})

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The frequency of the sound wave is

f_s = \frac{v}{\lambda_s}

f_s = \frac{344}{0.768}

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v = 208.768m/s

The expression that relates the velocity of the wave, tension on the string and linear mass density is

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f_n = nf_1

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n=3

Then,

f_3 = 3f_1

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f_1 = \frac{f_3}{3}

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f_1 = 149.9Hz

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