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Natali5045456 [20]
3 years ago
13

1. Two-point charges, QA = +8 μC and QB = -5 μC, are separated by a distance r = 10 cm. What is the magnitude and direction of t

he electric force? The constant k = 9 x 109 N-m2/C2
Physics
1 answer:
tiny-mole [99]3 years ago
6 0

Explanation:

Charges,q_1=8\ \mu C=8\times 10^{-6}\ C

q_2=-5\ \mu C=-5\times 10^{-6}\ C

The distance between charges, r = 10 cm = 0.1 m

We need to find the magnitude and direction of the electric force. It is given by :

F=\dfrac{kq_1q_2}{r^2}\\\\F=\dfrac{9\times 10^9\times 8\times 10^{-6}\times 5\times 10^{-6}}{(0.1)^2}\\\\F=36\ N

So, the required force between charges is 36 N and it is towards positive charge i.e. +8 μC.

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Which is the most accurate description of the plasma state of matter? A. It has a fixed volume. B. Its shape is not fixed. C. It
anastassius [24]

Answer:

Its shape is not fixed

Explanation:

Plasma is sometimes a subset of gases, whereas it is also a state of matter.

These two states are different.

  No fixed shape for plasmas, no fixed volume.

Compared to solids and liquids plasmas are less dense.

 Atoms are used in the making of Plasma.

In plasma state ions are the positively charged nuclei

 

When they gain or lose electrons these atoms and molecules acquire a positive or negative electrical charge,  process is called ionization.

8 0
3 years ago
The true shape of planetary orbits was discovered by _____.
White raven [17]
Kepler discovered the elliptical shape in the orbital path.<span />
6 0
3 years ago
Read 2 more answers
When the Sun, Earth, and Moon are in this position, the high tides will be lower than normal levels because
Gnesinka [82]
Ok, I’ll try to help, but I’d need to see the picture of the positions of the sun, earth, and moon to help you fully.

So, the first thing to note is that gravity is an attractive force, meaning that; something that has mass, call the m1 will “pull toward” another mass, call it m2. The two objects pull on each other, mutually.

If an object has more mass it pull more, and if an object has less mass, it pulls less.

Another thing to note is that distances matter. The closer the objects are to each other, the more pull they’ll “feel”.

So, the ocean tides are the effect of ocean water responding to a gravitational gradient, the moon plays a larger role in creating tides than the sun does. But the sun's gravitational gradient across the earth is significant and it does contribute to tides as well.

So, when the bulge of the ocean caused by the sun’s gravity, partially cancels out the bulge of the ocean caused by the moon gravity. This produces moderate tides known as the neap tides, meaning that high tides are a little lower and low tides are a little higher than average.

I hope that helps.
4 0
3 years ago
This is for physical science, need help :/
marusya05 [52]

1).  From the frame of reference of a passenger on the airplane looking out of his window, the tree appears to be moving, at roughly 300 miles per hour toward the left of the picture.

2).  The SI unit best suited to measuring the height of a building is the meter.

3).  'Displacement' is the straight-line distance and direction from the start-point to the end-point, regardless of the path that was followed to get there.  

The ball started out in the child's hand, and it ended up 2 meters away from her in the direction of the wall.  So the displacement of the ball from the beginning to the end of the story is:  2 meters toward the wall.


6 0
3 years ago
A 500 lb steel beam is lifted up by a crane to a height of 100 ft and is held there.
Nadya [2.5K]

A. How much work is being done to hold the beam in place?

Work is the product of Force and Displacement. Since there is no Displacement involved in just holding the beam in place, hence the work is zero.

 

B. How much work was done to lift the beam?

In this case, force is simply equal to weight or mass times gravity. Hence the work is:

Work = weight * displacement

Work = 500 lbf * 100 ft

Work = 50,000 lbf * ft

 

C. How much work would it take if the steel beam were raised from 100 ft to 200ft?

The displacement is still 100 ft since 200 – 100 = 100 ft, hence the work done is still similar in B which is:

<span>Work = 50,000 lbf * ft</span>

5 0
3 years ago
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