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lora16 [44]
3 years ago
10

Can someone help me on #18 - #26? At least one ☝️ I really need help!!!

Physics
1 answer:
Novosadov [1.4K]3 years ago
3 0
#18). (I think.  It's the one that starts with "Compare..."
Gravity ALWAYS attracts.
The force between electric charges can attract or repel ...
it depends whether the charges are the same kind or opposite kinds.

#19).
With both gravity and electric charges, the force between them quickly
becomes weaker when the distance between them increases.

#20).
I don't think it changes. 
If the doorknob gets charged by something that TOUCHES it, so that
charges can flow into it from the other object or out of it, then the total
amount of electric charge on it might change.  But the question says
that the doorknob is charged by an "electric field", so nothing touched it,
and charges couldn't flow into it or out of it.  The only way it got charged
was by the charges it already had in it getting moved around ... electrons
in one part of the knob moving over to the other side.  Then it would act
as if it was charged ... if you touched it, you might get zapped.

#21).,  #22).,  #23).
You're supposed to draw a graph to answer these.
It's a very easy graph to draw, and you should do it.
Label the x-axis 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
Label the y-axis 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 .
Put the four points on the graph ... A, B, C, and D.
For each point, the 'battery voltage' is the number on the x-axis
   and the 'Current' is the number on the y-axis.
Then draw a line through the points.
When you have the graph to look at, you can easily answer 21, 22, and 23.

24).  I'm not sure, and I don't want to guess.

25).  Did you ever move a coil of wire near a magnet in class ?
This is the same situation, only the magnet is moving and the wire is still.
The result will be the same.

26).  Magnets have two poles that attract
the opposite kind and repel.
Now you copy the map and fill in the other side.

This is a lot of work for 5 points, so I left some parts for you to do.
Another reason I did that is:  You'll learn a lot more that way.
You might be interested in
A motorcyclist is trying to leap across a canyon by driving horizontally off the higher side of the canyon at a speed of 78.0 m/
CaHeK987 [17]

Answer:

v = (78.0 i ^ - 70.27 j ^) m/s,      v = 105 m / s ,    θ = 318º

Explanation:

We have a projectile launch problem, let's start by calculating the time it takes to get through the canyon

        y = v_{oy} t - ½ gt2

As the motorcyclist comes out horizontally, the speed he has is the horizontal speed (vox) and the initial vertical speed is zero (I go = 0)

       y = 0 - ½ g t2

       t = √ 2y / g

       t = √ (2 252 /9.8)

       t = 7.17 s

Let's calculate the vertical speed for this time

        v_{y}  =  v_{oy}  - gt

        v_{y}  = 0 - gt

       v_{oy}  = - 9.8 7.17

       v_{oy}  = - 70.27 m / s

We can give the result in two ways

First:

    v = (78.0 i ^ - 70.27 j ^) m / s

Second:

using the Pythagorean theorem and trigonometry

   v² = vₓ² +  v_{oy} ²

   v = √ [(78.0)² + (-70.42)²] = √ (11042.98)

   v = 105 m / s

   tan θ₁ =  v_{y} y / vₓ

   tan θ₁ = -70.42 / 78.0

   θ₁ = 42º

If we measure this angle from the positive direction of the x-axis counterclockwise

    θ = 360 - θ₁

    θ = 360 - 42

    θ = 318º

8 0
2 years ago
The town of seaside needs to build a new power plant the old coal burning plant produces too much pollution and if no longer saf
drek231 [11]

To generate clean energy the mayor my build the fooling type of energy plants:

wind farms

solar power plants

wave power plants

Explanation:

At the seaside there are winds all over the year and that can be transformed in electrical energy by a wind turbine. The mayor can build a on-shore wind farm (reduced consts) and may also build off-shore wind farms (but these have an increased cost).

The second option is to build solar power plants. It will be cost effective if the people in the town will install solar panels on the building roofs. In this way you decrease the costs with the transportation of electrical energy.

The third option is to install wave power plants which harvest energy from the sea waves. It is a rather new technology, in comparison with the other two, but the initial consts can be amortized over time.

All three options will provide clean energy.

Right now nuclear plants have a very expensive initial costs and they may not be afforded by small towns.

Learn more about:

clean energy sources

brainly.com/question/235226

#learnwithBrainly

7 0
3 years ago
a block of ice accelerates and two meters per second dies has mass of 2 kilograms what is the size force it is acting on it
Dennis_Churaev [7]
F=ma
Force=mass*acceleration
So plug in the values
Hint: the force would be measured in newtons

6 0
2 years ago
A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. Af
faltersainse [42]

Answer:

0.55 m/s to the right is the answer.

4 0
3 years ago
Why does paper stand up when a van de graaf generator is on?
joja [24]

Answer:

because follicles are getting charged to the same potential

Explanation:

7 0
3 years ago
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