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olga_2 [115]
3 years ago
10

Which is not an example of an external force acting on an object? (1 point)

Physics
1 answer:
GrogVix [38]3 years ago
7 0

Answer:

A. a meteor traveling unhindered through space

Explanation:

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How much heat is needed to raise the temperature of 200 g of lead (c = 0.11 kcal/kg ∙ °c) by 10 c°?
Rufina [12.5K]
Heat = mass (m)*specific heat (C)* change in temperature (Δt)

In the current scenario,
mass = 200 g = 0.2 kg
C = 0.11 kCal/kg.°C
Δt = 10 °C

Therefore,
Heat = 0.2*0.11*10 = 0.22 kCal = 0.22*4186 J = 920.92 J
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3 years ago
Find the currents flowing in the circuit in the figure below. (Assume the resistances are
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By Kirchoff's law in left side loop

E_1 + E_2 = {r_1 + R_1 + R_4)I_1 + (R_2 + r_2) I_3

similarly kirchoff's law in right side loop

E_3 - E_4 - E_2 = (r_3 + r_4 + R_3)I_2 - (R_2 + r_2)I_3

also by junction law we know that

I_1 = I_2 + I_3

now by plug in all values we have

18 + 3 = (0.5 + 8 + 15)I_1 + (10 + 0.25)I_3

21 = 23.5I_1 + 10.25I_3

12 - 24 - 3 = (0.75 + 0.25 + 12)I_2 - (10+ 0.25)I_3

-15 = 13I_2 - 10.25I_3

So by solving above equations we have

I_1 = 0.492 A

I_2 = -0.428 A

I_3 = 0.920 A

6 0
3 years ago
Does the universe have centre?​
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3 0
3 years ago
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Is aluminum foil reflecting onto something conduction, convection, or radiation?
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3 years ago
What is the measure of the force that gravity applies to an object
GarryVolchara [31]

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