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makvit [3.9K]
4 years ago
12

Five moles of an ideal monatomic gas with an initial temperature of 127∘C expand and, in the process, absorb 1500 J of heat and

do 2100 J of work. What is the final temperature of the gas?
Physics
1 answer:
Alja [10]4 years ago
8 0

Answer:

117.38^{\circ}C

Explanation:

We are given that

Initial temperature=T_1=127^{\circ}

Number of moles=n=5

Heat absorbed,Q=1500 J

Work done=W=2100 J

We have to find the final temperature  of the gas.

\Delta U=Q-W=1500-2100=-600 J

T_2=\frac{2\Delta U}{3nR}+T_1

Where R=8.314 J/mol-K

Using the formula

T_2=\frac{2\times (-600)}{3\times 5\times 8.314}+127^{\circ} C

T_2=117.38^{\circ}C

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if a person can jump 2m in earth surface how high can he jump in the moon (g of moon = 1.66m/s, g of earth = 9.8 m/s) [hint: use
julia-pushkina [17]

Answer:

h_{moon} = 11.8\ m

Explanation:

Since the work done is same everywhere in the universe. Hence, the work done in jumping will be same for the person on moon and earth:

W_{moon} = W_{earth}\\\\P.E_{moon} = P.E_{earth}\\\\mg_{moon}h_{moon} = mg_{earth}h_{earth}\\\\g_{moon}h_{moon} = g_{earth}h_{earth}\\\\(1.66\ m/s^2)h_{moon} = (9.8\ m/s^2)(2\ m)\\\\h_{moon} = \frac{(9.8\ m/s^2)(2\ m)}{1.66\ m/s^2}\\\\h_{moon} =  11.8\ m

5 0
3 years ago
How much work is done when a hoist lifts a 290-kg rock to a height of 7 m?
Zepler [3.9K]
Given: Mass m = 290 Kg;  Height  h = 7 m

Required: Work = ?

Formula: Work = Force x distance  but, Force F = mg

W= fd

W = mgh

W= (290 Kg)(9.8 m/s²)(7 m)

W = 19,894 Kg.m²/s²

W = 19,894  J




  
5 0
4 years ago
Why cooking pots are provided with wooden or plastic handles
Lelechka [254]
Metal cooking pots and pans often have wooden handles. Wood has a higher specific heat than metal, so it takes more energy to heat a wooden handle than a metal handle. As a result, a wooden handle would heat up more slowly and be less likely to burn your hand when you touch it.
7 0
3 years ago
A rancher in Texas drills for water on her property and in the process, hits oil which squirts strongly from the ground. Within
Anon25 [30]

Answer:

<h2>a) secondary oil recovery.</h2>

Explanation:

Secondary oil recovery is used when the pressure inside the well is to high, being not possible to do a primary oil recovery.

To do this method, high pressure is needed, like this case because it says that ''squirts strongly''.

On the other hand, tertiary oil recovery is used when another method is not possible. Hydraulic fracturing or fracking, it's develop with a horizontal drilling, which is not the case.

8 0
3 years ago
A runner of mass 53.0 kg runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its cen
const2013 [10]

Answer:

0.336 rad/s

Explanation:

\omega_1 = Angular speed of the turntable = -0.2 rad/s

R = Radius of turntable = 2.9 m

I = Moment of inertia of turntable = 76\ kgm^2

M = Mass of turn table = 53 kg

v_1 = Magnitude of the runner's velocity relative to the earth  = 3.6 m/s

As the momentum in the system is conserved we have

Mv_1R+I\omega_1=(I + MR^2)\omega_2\\\Rightarrow \omega_2=\dfrac{Mv_1R+I\omega_1}{I + MR^2}\\\Rightarrow \omega_2=\dfrac{53\times 3.6-76\times 0.2}{76+53\times 2.9^2}\\\Rightarrow \omega_2=0.336\ rad/s

The angular velocity of the system if the runner comes to rest relative to the turntable which is the required answer is 0.336 rad/s

4 0
3 years ago
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