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Natalija [7]
3 years ago
9

A 200 g mass is placed on the meter stick 20 cm from the fulcrum. An

Physics
1 answer:
stira [4]3 years ago
3 0

Answer:

m = 500 grams

Explanation:

Assuming that the fulcrum is at the midpoint of a uniform meter stick, the moments about the fulcrum must be equal and opposite.

the 200 g mass makes a moment

200(g)[20] = 4000g gm•cm

the other mass must also create a moment of the same value

m(g)[8] = 4000g

m[8] = 4000

m = 500 grams

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It takes 52,000 Joules to heat a cup of coffee to boiling from room temperature. How long a piece of 20 cm wide Aluminum foil wo
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Answer:

L = 1.11 x 10^{6} m, is the length of piece of 20 cm wide Aluminum foil to make capacitor large enough to hold 52000 J of energy.

Explanation:

Solution:

Data Given:

Heat Energy = 52000 J

Dielectric Constant of the plastic Bag = 3.7 = K

Thickness = 2.6 x 10^{5} m =d

V = 610 volts

A = width x Length

width = 20 cm = 20 x 10^{-2} m

Length = ?

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we know that,

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U = 1/2 C Δv^{2}  

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Plugging in the values into the formula, we get:

0.28 = \frac{3.7 * 8.85 .10^{-12} * (0.20 . L) }{2.6 . 10^{5} }

Solving for L, we get:

L = 1.11 x 10^{6} m,

is the length of piece of 20 cm wide Aluminum foil to make capacitor large enough to hold 52000 J of energy.  

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