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vodka [1.7K]
3 years ago
7

Two resistors, R1=2.79 Ω and R2=6.37 Ω , are connected in series to a battery with an EMF of 24.0 V and negligible internal resi

stance. Find the current I1 through R1 and the potential difference V2 across R2 .
Physics
1 answer:
zmey [24]3 years ago
4 0

Answer:

Current Through R₁ = I₁ = 2.62 A and V₂ = 16.6 V

Explanation:

<u>To find I₁ across R₁</u>

For series circuit same amount of current are flowing through all resister ie

I₁ = I₂ = I

To find I₁ we have to calculate R(eq)=R₁ + R₂ =2.79Ω + 6.37Ω = 9.16 Ω

V = 24.0 V (given)

So I = I₁ = V / R(eq) = 24 V / 9.16 Ω =2.62 A

<u>To find V₂ across R₂</u>

As in series circuit the potential difference across each resisters are of different amount depending upon the resistance of resister,  so V₂ = I R₂

⇒ V₂ = 2.62 A × 6.37 Ω = 16.6 V

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A large fake cookie sliding on a horizontal surface is attached to one end of a horizontal spring with spring constant k = 440 N
irinina [24]

Answer:

a) 0.275 m b) 13.6 J

Explanation:

In absence of friction, the energy is exchanged between the spring (potential energy) and the cookie (kinetic energy), so at any point, the sum of both energies must be the same:

E = ½ kx2 + ½ mv2

If we take as initial state, the instant when the cookie is passing through the spring’s equilibrium position, all the energy is kinetic, and we know that is equal to 20.0 J.

After sliding to the right, while is being acted on by a friction force, it came momentarily at rest. At this point, the initial kinetic energy, has become potential elastic energy, in part, and in thermal energy also, represented by the work done by the friction force.

So, for this state, we can say the following:

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We have a quadratic equation, that, after simplifying terms, can be solved as follows, applying the quadratic formula:

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b) If we take as our new initial status the moment at which the spring is compressed, and the cookie is at rest, all the energy is potential:

E = Ui = 1/2 k d²

In this case, d is the same value that we got in a), i.e., 0.275 m (as the distance travelled by the cookie after going through the equilibrium point is the same length that the spring have been compressed).

E= 1/2 440 N/m . (0.275)m² = 16.6 J

When the cookie passes again through the equilibrium position, the energy will be in part kinetic, and in part, it will have become thermal energy again.

So, we can write the following equation:

Kf = Ui - Ff.d = 16.6 J - 11.0 (0.275) m = 16.6 J - 3.03 J = 13.6 J

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Lemur [1.5K]
Hello,

Here is your answer:

The proper answer to this question is option B "<span>chemical properties".

Here is how:

</span>Electrons determine a atoms chemical properties mainly what its made of.

Your answer is B.

If you need anymore help feel free to ask me!

Hope this helps!
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