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Vera_Pavlovna [14]
3 years ago
15

Describe the difference between contact forces and field forces.

Physics
1 answer:
Salsk061 [2.6K]3 years ago
8 0
Contact forces has to be touching for it to be an actual force. A field force does not have to be touching but it does have to be acting on particles at different positions in a space.
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so A.
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When I bump the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction.
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When I bump the table, the coffee in my cup spilled out. Newton's 1st law explains this reaction.

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Hull (1943) had rats push a lever that required 21 grams of force to budge. After they had learned to push the lever in order to
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How do resistors in parallel affect the total resistance?
4vir4ik [10]

Answer:

They're going to increase the total resistance as R_{T} = \sum\limits_{i=1}^N \left(\frac{1}{R_i} \right)^{-1}

Explanation:

If the resistors are in parallel, the potential difference is the same for each resistor. But the total current is the sum of the currents that pass through each of the resistors. Then

I = I_1 + I_2 + ... + I_N

where

I_i = \frac{V_i}{R_i}

but

V_i = V_j = V for i,j= 1, 2,..., N

so

I = \frac{V}{R_1}+ \frac{V}{R_2} + ... + \frac{V}{R_N} = \left(\frac{1}{R_1} +\frac{1}{R_2} + ... + \frac{1}{R_N}\right)V = \frac{V}{R_T}

where

R_T = \left(\frac{1}{R_1} +\frac{1}{R_2} + ... + \frac{1}{R_N}\right)^{-1} =\sum\limits_{i=1}^N \left(\frac{1}{R_i} \right)^{-1}

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3 years ago
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