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3 years ago

Which is the best procedure to make a permanent magnet?

Physics

2 answers:

notka56 [123]3 years ago

7 0

placing a magnetically hard material in a strong magnetic field

fgiga [73]3 years ago

3 0

<h3>Answer;</h3>

Placing a magnetically hard material in a strong magnetic field

<h3>Explanation;</h3>

Magnets are those materials that generate magnetic field. Materials may either be magnetic materials or non-magnetic materials. Non magnetic materials are those materials that can not be attracted by a magnet while magnetic materials are those that can be attracted by a magnet.
Magnetic materials may be classified as either soft magnetic materials or hard magnetic materials based on the ease of magnetization. Soft magnetic materials are those materials that are easily magnetized and easily demagnetized while hard magnetic materials are hard to magnetize and demagnetized.
Hard magnetic materials are used to make permanent magnets. This is done by placing them in a strong magnetic field.

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A rock is tossed straight up from the ground with a speed of 21 m/s . When it returns, it falls into a hole 10 m deep.a.) What i

Arte-miy333 [17]

(a) 25.2 m/s

Let's take the initial vertical position of the rock as "zero" (reference height).

According to the law of conservation of energy, the speed of the rock as it reaches again the position "zero" after being thrown upwards is equal to the initial speed of the rock, 21 m/s (in fact, if there is no air resistance, no energy can be lost during the motion; and since the kinetic energy depends only on the speed of the rock:

$K=\frac{1}{2}mv^2$

and the gravitational potential energy of the rock has not changed, since the rock has returned into its initial position, it means that the speed of the rock should be the same)

This means that we can only analyze the final part of the motion, the one in which the rock falls into the 10 m hole. Since it is a free fall motion, we can find the final speed by using

$v^2 = u^2 + 2gd$

where

u = 21 m/s is the initial speed of the rock as it enters the hole

g = 9.8 m/s^2 is the acceleration due to gravity

d = 10 m is the depth of the hole

Substituting,

$v=\sqrt{u^2 +2gd}=\sqrt{(21 m/s)^2+2(9.8 m/s^2)(10 m)}=25.2 m/s$

(b) 4.72 s

The vertical position of the rock at time t is given by

$y(t) = v_y t - \frac{1}{2}gt^2$

where

$v_y = 21 m/s$ is the initial vertical velocity

Substituting y(t)=-10 m, we can then solve the equation for t to find the time at which the rock reaches the bottom of the hole:

$-10 = 21 t - \frac{1}{2}(9.8)t^2\\10+21 t -4.9t^2 = 0$

which has two solutions:

t = -0.43 s --> negative, so we discard it

t = 4.72 s --> this is our solution

7 0

4 years ago

What does the horizontal line through the center of the wave on a graph represent?

aleksandrvk [35]

Answer:

This is the midline or the medium which is the exact middle of the graphs minimum and maximum points(which are the amplitude)

8 0

3 years ago

A high amplitude sound wave can best be compared to a

Lera25 [3.4K]

The choices for this question can be found elsewhere and as follows:

short hill.
tall hill.
tightly coiled spring.
stretched-out spring.

I think the best answer is the third option. A high amplitude sound wave can best be compared to a tightly coiled spring. A high energy wave is characterized by having a high amplitude.

4 0

3 years ago

Read 2 more answers

When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?(1 point

RideAnS [48]

The statement which best explains why when you trip, your foot stops, but your body continues to move forward is: A. An unbalanced force stops your foot but does not act on the rest of your body.

A force can be defined as a push or pull of an object or a physical body, which typically results in a change of motion due to the interaction of the object with another.

In Physics, there are two (2) main types of force and these are:

Balanced force.

Unbalanced force.

An unbalanced force occurs when two or more forces acting on an object or a physical body are not equal in magnitude and as such, it typically results in a change of motion.

In conclusion, when you trip, your foot stops, but your body continues to move forward because an unbalanced force stops your foot but doesn't act on the other part of your body.