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Savatey [412]
4 years ago
6

When a certain gas under a pressure of 4.65 106 Pa at 21.0°C is allowed to expand to 3.00 times its original volume, its final p

ressure is 1.06 106 Pa. What is its final temperature?
Physics
1 answer:
Marina CMI [18]4 years ago
7 0

Answer:

-72.0°C

Explanation:

PV = nRT

Since n, number of moles, is constant:

PV / T = PV / T

(4.65×10⁶ Pa) V / (21 + 273.15) K = (1.06×10⁶ Pa) (3V) / T

T = 201.16 K

T = -72.0°C

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A tank with a flat bottom is filled with water to a height of 7.5 meters. What's the pressure at any point at the bottom of the
Ivanshal [37]
<h3>Answer:</h3>
  • p=75 kPa
<h3>Explanation:</h3>

_______________

h=7,5 m

g=10 m/s²

ρ=1000 kg/m³

_______________

p - ?

_______________

p=ρgh=1000 kg/m³ · 10 m/s² · 7,5 m = 75000 Pa = 75 kPa

5 0
2 years ago
If a cup of coffee has temperature 95∘C95∘C in a room where the temperature is 20∘C,20∘C, then, according to Newton's Law of Coo
lina2011 [118]

Answer:

T = 76.39°C

Explanation:

given,

coffee cup temperature = 95°C

Room temperature= 20°C

expression

T( t ) = 20 + 75 e^{\dfrac{-t}{50}}

temperature at t = 0

T( 0 ) = 20 + 75 e^{\dfrac{-0}{50}}

T(0) = 95°C

temperature after half hour of cooling

T( t ) = 20 + 75 e^{\dfrac{-t}{50}}

t = 30 minutes

T( 30 ) = 20 + 75 e^{\dfrac{-30}{50}}

T( 30 ) = 20 + 75 \times 0.5488

T(30) = 61.16° C

average of first half hour will be equal to

T = \dfrac{1}{30-0}\int_0^30(20 + 75 e^{\dfrac{-t}{50}})\ dt

T = \dfrac{1}{30}[(20t - \dfrac{75 e^{\dfrac{-t}{50}}}{\dfrac{1}{50}})]_0^30

T = \dfrac{1}{30}[(20t - 3750e^{\dfrac{-t}{50}}]_0^30

T = \dfrac{1}{30}[(20\times 30 - 3750 e^{\dfrac{-30}{50}} + 3750]

T = \dfrac{1}{30}[600 - 2058.04 + 3750]

T = 76.39°C

4 0
3 years ago
A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the
faust18 [17]

Answer:

t = S / V     where S is distance sound travels and V the speed of sound

S = 20 + 20 - v t      where v is speed of bat and t time to hear echo

S = 40 - v t

t = (40 - S) / v = (40 - V t) / v      substituting S from 1st equation

v t + V t = 40

t = 40 / (v + V) = 40 / (340 + 2) = .117 sec = 117 ms

6 0
3 years ago
Ok, so this question is probably really easy but I can't really be bothered to answer it, terrible I know, but I thank all usefu
Dvinal [7]
Without a bulb energy cant go through and it would be an open circuit blocking the energy from coming out.
3 0
3 years ago
you hold a metal block of mass 40 kg above your head at a height of 2 m how much work is done bu gravity if you let the block fa
zzz [600]

Answer:

784 J

Explanation:

Work is force times distance.

W = Fd

W = mgd

W = (40 kg) (9.8 m/s²) (2 m)

W = 784 J

8 0
4 years ago
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