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Scrat [10]
3 years ago
13

36. Two point charges are separated by 6 cm. The attractive force between them is 20 N. Find the force between them when they ar

e separated by 12 cm. (Why can you solve this problem without knowing the magnitudes of the charges
Physics
1 answer:
Alex3 years ago
5 0

Answer:

The force between two charges when they are separated by distance 12 cm is  5N  

Explanation:

Here lets us consider two charges q_{1} and q_{2} .

Let F_{1}  be the force between them when they are separated by distance 6 cm

     F_{2} be the force between them when distance between them = 12 cm

            F_{1} = \frac{KQ_{1}Q_{2}}{6^{2}}  =20 N     ..................1

            F_{2} = \frac{KQ_{1}Q_{2}}{12^{2}}                 ...................2

 Dividing both equations , we get

        \frac{20}{F_{2}} =\frac{12^{2}}{6^{2}}

    F_{2} = 5N.

Here we need not to know the values of charges , since they get cancelled while dividing.

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<u>Answer:</u> The final temperature of the solution is 80.14^oC

<u>Explanation:</u>

The amount of heat released by coffee will be absorbed by aluminium spoon.

Thus, \text{heat}_{absorbed}=\text{heat}_{released}

To calculate the amount of heat released or absorbed, we use the equation:  

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

Also,

m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]    ..........(1)

where,

q = heat absorbed or released

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m_2 = mass of coffee = 166 g

T_{final} = final temperature = ?

T_1 = temperature of aluminium = 24^oC

T_2 = temperature of coffee = 83^oC

c_1 = specific heat of aluminium = 0.904J/g^oC

c_2 = specific heat of coffee= 4.1801J/g^oC

Putting all the values in equation 1, we get:

39\times 0.904\times (T_{final}-24)=-[166\times 4.1801\times (T_{final}-83)]

T_{final}=80.14^oC

Hence, the final temperature of the solution is 80.14^oC

4 0
3 years ago
Alice climbs 100 meters directly up the face of a cliff to reach the summit. Her friend Peter hikes the long way around taking a
SOVA2 [1]

Answer:

Alice Distance = 100 meters

Peter's Distance = 3 km

Alice Displacement and Peter's displacement are both 100 meters upwards.

Explanation:

To solve this question, we have to first define distance and displacement.

Distance is simply the measurement of the sum of all paths travelled from one point to another while displacement is measurement of the shortest distance from initial point to final point.

Now, Alice and Peter are moving from the same point.

Alice distance travelled is 100 meters.

Also, her displacement will be 100 meters because it is the shortest distance to the summit of the cliff.

Now, for Peter, he decides to take a longer route which is 3 km in distance.

However, the shortest path which is the displacement is still 100 meters.

Thus, Peter's displacement is 100 meters.

4 0
3 years ago
1. first nuclear reactor
IRISSAK [1]
The correct matches are as follows:

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7 0
3 years ago
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Answer:

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8 0
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sasho [114]

Answer:

Red has the longest wavelength among all the visible colors of light.

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Red has the longest wavelength of around 700 nano meters with violet has the shortest wavelength of 380 nano meters.

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