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LuckyWell [14K]
3 years ago
5

Select all that apply.

Physics
2 answers:
ikadub [295]3 years ago
6 0
All are true except the first two.
kolbaska11 [484]3 years ago
6 0

Positively charged objects attract negatively charged objects.

-PlushDna

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A cylinder with a piston contains 0.200 mol of oxygen at 2.00×105 Pa and 360 K . The oxygen may be treated as an ideal gas. The
ikadub [295]

Answer:

A. W=600\ J

B. Q=2112\ J

C. \Delta U=1512\ J

D. W=0\ J

Explanation:

Given:

  • no. of moles of oxygen in the cylinder, n=0.2
  • initial pressure in the cylinder, P_i=2\times 10^5\ Pa
  • initial temperature of the gas in the cylinder, T_i=360\ K

<em>According to the question the final volume becomes twice of the initial volume.</em>

<u>Using ideal gas law:</u>

P.V=n.R.T

2\times 10^5\times V_i=0.2\times 8.314\times 360

V_i=0.003\ m^3

A.

<u>Work done by the gas during the initial isobaric expansion:</u>

W=P.dV

W=P_i\times (V_f-V_i)

W=2\times 10^5\times (0.006-0.003)

W=600\ J

C.

<u>we have the specific heat capacity of oxygen at constant pressure as:</u>

c_v=21\ J.mol^{-1}.K^{-1}

Now we apply Charles Law:

\frac{V_i}{T_i} =\frac{V_f}{T_f}

\frac{0.003}{360} =\frac{0.006}{T_f}

T_f=720\ K

<u>Now change in internal energy:</u>

\Delta U=n.c_p.(T_f-T_i)

\Delta U=0.2\times 21\times (720-360)

\Delta U=1512\ J

B.

<u>Now heat added to the system:</u>

Q=W+\Delta U

Q=600+1512

Q=2112\ J

D.

Since during final cooling the process is isochoric (i.e. the volume does not changes). So,

W=0\ J

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3 years ago
a 1000 kg car crashed into bearer . the car changed speed from 30 m/s to 20 m/s in 2 seconds . What force did the bearer apply t
Allushta [10]
The bearer used an opposite force to slow the car.
3 0
3 years ago
Read 2 more answers
PLEASE HELP IM UNSURE OF WHAT THE ANSWER IS
katovenus [111]

Answer:

The horizontal forces (Cols 2 & 3) balance for W and Y.

The vertical forces (Cols 1 & 4) also balance for W and Y.

This is not true for either X (unbalanced horizontal forces) or

Z (also unbalnced horizontal forces)

6 0
3 years ago
3. A crane can lift a 5000 N object to height of 30 m in 120 seconds. The power at which the crane is
dolphi86 [110]
It’s D. I hope it helps
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A car with a mass of 1,200 kg travels a distance of 150 m as it moves from
vfiekz [6]

Answer: A

Explanation: JUST DID IT ON APEX

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