3 years ago

Question 6 (1 point)

Physics

1 answer:

jarptica [38.1K]3 years ago

8 0

Explanation:

decrease,then increase

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If two charged objects each have 2.5 C of charge on them and are located 100 m apart, how strong is the electrostatic force betw

LiRa [457]

Answer:

5.619×10⁶ N

Explanation:

Applying,

F = kqq'/r²................... Equation 1

Where F = electrostatic force between the charges, k = coulomb's constant, q = first charge, q' = second charge, r = distance btween the charges

From the questiion,

Given: q = 2.5 C, q' = 2.5 C, r = 100 m

Constant: 8.99×10⁹ Nm²/C²

Substitute these values into equation 1

F = (2.5×2.5×8.99×10⁹)/100²

F = 56.19×10⁵

F = 5.619×10⁶ N

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What is the thermal efficiency of a gas power cycle using thermal energy reservoirs at 627°C and 90°C?

vlada-n [284]

Answer:

The value is $\eta = 63\%$

Explanation:

Generally the thermal efficiency is mathematically represented as

$\eta = 1 - \frac{T_L}{T_H} * 100$

substituting [ 627°C + 273 = 900K ] for $T_H$ and [ 90°C + 273 = 333K ] for $T_L$

$\eta = 1 - \frac{333}{900} *100$

=> $\eta = 63\%$

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3 years ago

A cylinder contains 3.5 L of oxygen at 350 K and 2.7 atm . The gas is heated, causing a piston in the cylinder to move outward.

Effectus [21]

Answer:

The pressure is $P_2 = 1.84 \ a.t.m$

Explanation:

From the question we are told that

The first volume of is $v_1 = 3.5 \ L$

The first pressure is $P_1 = 2.7 \ a.t.m$

The first temperature is $T_1 = 350 \ K$

The new temperature is $T_2 = 620 \ K$

The new volume is $V_2 = 9.1 \ a.t.m$

Generally according to the combined gas law we have that

$\frac{P_1 V_1 }{T_1 } = \frac{P_2 V_2 }{T_2 }$

=> $P_2 = \frac{P_1 * V_1 * T_2 }{T_1 * V_2 }$

=> $P_2 = \frac{ 2.7 * 3.5 * 620 }{ 350 * 9.1 }$

=> $P_2 = 1.84 \ a.t.m$

4 0

3 years ago