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elena-14-01-66 [18.8K]
3 years ago
14

A small sphere has a harge of 9uC and other small sphere has a charge of 4uC.

Physics
1 answer:
Helga [31]3 years ago
7 0

Answer:

Electrical force, F = 90 N

Explanation:

It is given that,

Charge on sphere 1, q_1=9\ \mu C=9\times 10^{-6}\ C

Charge on sphere 2, q_1=4\ \mu C=4\times 10^{-6}\ C

Distance between two spheres, d = 6 cm = 0.06 m

Let F is the electrical force between them. It is given by the formula of electric force which is directly proportional to the product of charges and inversely proportional to the square of distance between them such that,

F=k\dfrac{q_1q_2}{d^2}

F=9\times 10^9\times \dfrac{9\times 10^{-6}\times 4\times 10^{-6}}{(0.06)^2}

F = 90 N

So, the electrical force between them is 90 N. Hence, this is the required solution.

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As relay runner A enters the 65-ft-long exchange zone with a speed of 30 ft/s, he begins to slow down. He hands the baton to run
Hoochie [10]

Answer:

a_a = -3.2 ft/s^2   ,   a_b = 3.723 ft/s^2

t = 5.909 s

Explanation:

Given:

  - Initial velocity of A v_i,a = 30 ft /s

  - Initial distance s_o = 0

  - Length of the exchange zone s_f = 65 ft

  - Time taken t = 2.5 s

Start out by A's velocity as he gets to the end of the exchange zone.

Part a

Runner A decelerates at a uniform rate, so you can use the equation:

                           s_f = s_o + v_i,a*t + 0.5a_a*t^2

                        65 = 0 + 30*2.5 + 0.5*a_a*2.5^2

                                   a_a = -20 / 2.5^2

                                   a _a= -3.2 ft/s^2    

Runner B accelerates at v_f,a as final velocity at a uniform rate, so you can use the equation:

                              v_f,b^2 - v_i,b^2  = 2*a_b*s

                              a_b = (30 -3.2*2.5)^2 /2*65

                                   a_b = 3.723 ft/s^2

Part b

When Runner B should begin running:

                                t = (v_f,b - v_i,b) / a_b

                               t = (30 - 3.2*2.5) / 3.723

                                        t = 5.909 s  

5 0
3 years ago
You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4 NN . If you t
shtirl [24]

Answer:

2491.23 kg/m³

Explanation:

From Archimedes principle,

R.d = weight of object in air/ upthrust in water = density of the object/density of water

⇒ W/U = D/D' ....................... Equation 1

Where W = weight of the ceramic statue, U = upthrust of the ceramic statue in water, D = density of the ceramic statue, D' = density of water.

Making D the subject of the equation,

D = D'(W/U).................... Equation 2

Given: W = 28.4 N, U = lost in weight = weight in air- weight in water

U = 28.4 - 17.0 = 11.4 N,

Constant: D' = 1000 kg/m³.

Substitute into equation 2,

D = 100(28.4/11.4)

D = 2491.23 kg/m³

Hence the density of the ceramic statue = 2491.23 kg/m³

7 0
3 years ago
How do you give an example for finding net force?
Crazy boy [7]
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--  grabbing your big dog by his collar and trying to bring him inside

--  three people at the table all grab the ketchup bottle at the same time
7 0
3 years ago
The liquid contained in batteries that conducts electric charge is called the: solution, electrolyte, suspension, colloid
blondinia [14]

Answer:

The liquid contained in batteries that conducts electric charge is called the. electrolyte.

7 0
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Which end (blue or red) of the visible spectrum has the longer wavelength? Which has the higher frequency?
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The red end of the visible spectrum has the longer wavelength while the blue end of the visible spectrum has the higher frequency.
8 0
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