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sound is caused by vibrations

Answer:

Vibrations

Explanation:

Sounds are produced by vibrations.

Sound travels as waves, which in turn create other particles to vibrate creating vibrating particles and change sound.

Sound waves are reflected by surfaces.

3. The simple explanation for the Red Planet's color is that its regolith, or surface material, contains lots of iron oxide — the same compound that gives blood and rust their hue. ... It does have an iron core, but abundant iron exists in its upper layers, also.

true North is fixed point on the globe

magnetic North is the direction that a compass needle points to as it aligns with the earths magnetic field and what is interesting is that the magnetic North pole shifts and changes over time in response to change in the earth's magnetic core

Answer:

6.66666 sec/m or 6 2/3 sec/m

Answer:

6.67 meters per second

Explanation:

120/18=6.67 meters per second

Answer:

The Interpretation of Dreams": Freud noticed that dreams played an important role in his analysis of neurotic and "hysterical" patients. When he asked his patients to talk about whatever came into their minds, they often referred to their dreams, which would set off other associations and often illuminate other important connections in their past experience. It took Freud about two years to write the book, finishing it in September 1897.

To answer this question, it is necessary to apply the static condition from Newton´s Laws

The solution is:

Fd > Fc > Fa > Fb

From the body free diagram, and from the second Newton´s law of movement we get:

∑ Fx  = 0           F - Fr  = 0         F = Fr             Fr = μ×N

∑ Fy  = 0     N = m×g  ⇒   Therefore       Fr = μ×m×g

F = μ×m×g      g is the same in all the cases, then we just compare the products  μ×m

So when F is just greater than Fr, the body will start moving

we make a table, with values from the information table.

1.-  μ×m   =  0.5× 40  = 20

2.-μ×m   =  0.4× 80   = 16

3.- μ×m   = 0.7× 30   = 21

4.- μ×m   = 0.9× 35   = 31.5

According to the table, from highest to lowest the magnitude of the horizontal force is:

Fd > Fc > Fa > Fb

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Answer:

Explanation:

The mass of the box can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{10}{1.2} = 8.333... \\ [/tex]

We have the final answer as

Hope this helps you

Answer: I believe offense is the attacking team and defense is the defending team

Source: I just peeked at dad watching football

Answer:

- 0.5 m/s

Explanation:

(1) Acceleration = change in velocity / time

(2) Change in velocity = (Final velocity - Initial velocity)

We know:

acceleration = 1.5 m/s/s

time = 5 seconds

final velocity = 7 m/s

x = initial velocity)

1.5 = ( 7 - x ) / 5

1.5 x 5 = ( 7 - x )

7.5 = 7 - x

x = -0.5 m/s

You can check the answer by plugging in the values to equation (1).

Answer:

Explanation:

100.5=200.V2

V2 = 2,5L

Answer:  5.8 hours

Explanation:

Time= distance divided by speed, so:

350 divided by 60= 5.8 hours

Over the course of the 4 hours for which farmer Joe's tractor is pulling the heavy plow, the plow is gaining energy by virtue of its displacement --termed the Kinetic energy.

According to the question, Farmer Joe drives the tractor for 4 hours.

However, the tractor is connected to a heavy plow and is used to pull the plow across a rocky field.

The question requires that we determine if the plow is gaining or losing energy.

However, the focus of the question is during the pulling action of the tractor on the plow.

Ultimately, the plow is gaining energy as it is being pulled by the tractor and now has Kinetic energy.

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 30 g

volume = 30 mL

We have

[tex]density = \frac{30}{30} = 1 \\ [/tex]

We have the final answer as

Hope this helps you

The characteristics of the ionic bonds allows to find the results for the question about which compound are ionic is:

    d) Compounds D and A.

Chemical compounds are formed by atoms linked by electrostatic forces, where one of the elements gave up some electrons and the other element acquired these electrons, the two atoms being in an ionic state, consequently the bond is strong and has several characteristics:

In these characteristics, let's analyze the compounds in the table.

Let's review the different alternatives:

a) False. Compound A and B has a low melting point.

b) False. The B and C compounds have low melting points.

c) False. Compound C has a low melting point.

d) True. The two compounds meet all the characteristics of ionic compounds.

In conclusion with the characteristics of the ionic bonds we can find the results for the question about which compound are ionic is:

       d) Compounds D and A are ionics.

Learn more about ionic bonding here:  brainly.com/question/13526463

Volcanic Island arcs form when an oceanic tectonic plate is subducted below a tectonic plate  taking seawater with it.

Volcanic island arcs occur offshore during volcanoes. They occur due to the subduction of an oceanic plate under another tectonic plate. Volcanic Island arcs occur mostly in ocean basins.

Due to the subduction of oceanic plates under tectonic plates, Island Arcs are found, mostly along the margins of continent.

Hence we can conclude that Volcanic Island arcs Form when an oceanic tectonic plate is subducted below a tectonic plate  taking seawater with it.

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Answer:

The Answer would be C

In a series circuit , the current can only flow through only one path from start to finisb

Answer:

How are we expected to make an island

It is important to understand the differences between physical and chemical changes. ... It helps to think of physical changes as those involving changes that don't change the make up of the substance, while chemical changes are those that create a new substance. Physical Changes involve energy.

Answer:

The result is that epicentres of earthquakes farther to the interior of the overriding plate will correspond to increasingly deep earthquakes.

Answer:

140 m/s

Explanation:

v = u + at

v = 8 + 3.5(40) = 140 + 8 = 140

Answer:

The force by which a substance (magnet) attracts a body(metals) towards it is called magnetic force

Answer:

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.

Explanation:

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Answer:

weight= density ×volume× 9.8

mass=density×volume

Explanation:

[tex]weight = 0.12 \times 0.04 \times 0.04 \times 3.14 \times 13600 \\ \times 9.8 = 80.351 \: n \\ \\ mass = 0.12 \times 0.04 \times 0.4 \times 3.14 \times 13600 = \\ = 8.199 \: kg[/tex]

The impact speed will be

v^2 = 2*9.8*1.3

v^2 = 25.48

v= 5.04 m/s or O C. 5.0 m/s

Velocity describes motion by indicating how fastan object moves and in what direction. Speed is a magnitude of velocity, which indicates only how fast an object moves. Speed shows how much distance is traversed in a given interval of time: In a general case of motion,.

In order to increase the momentum of the ball, you have to increase its speed.

The first and third choices on the list ('A' and 'C') will do that.

The factors that will increase momentum of a rolling ball are:

A. Moving from a flat surface to moving downhill.

C. A moving object traveling in the same direction as the ball colliding with it.

The gravitational power of the Earth ready makes the ball speed up, and in this manner pick up speed.

If you increase either mass or velocity, the momentum of the object increases proportionally.

Thus, the factors that increase the momentum of a rolling ball are

A. Moving from a flat surface to moving downhill.

C. A moving object traveling in the same direction as the ball colliding with it.

Find more information about momentum here:

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Answer:

definition of force

Explanation:

It states that "the rate of change in momentum is proprtional to the force applied"

[tex]{ \rm{momentum = mass \times velocity}} \\ [/tex]

• from the law stated:

[tex]{ \rm{ \frac{ \delta momentum}{time} = force}} \\ \\ { \rm{ \frac{mv - mu}{time} = force}} \\ \\ { \rm{ \frac{mass(v - u)}{time} = force}} \\ \\ { \rm{mass \times \frac{(v - u)}{time} = force }}[/tex]

• from first newton equation:

[tex]{ \boxed{ \tt{ \frac{v - u}{t} = acceleration}}} \\ [/tex]

• therefore

[tex]{ \rm{mass \times acceleration = force}} \\ \\ { \boxed{ \rm{force = mass \times acceleration}}}[/tex]

An applied force applied causes a body such as the spacecraft to move. The magnitude of the force determines the change in the velocity

What will happen to the spacecraft is given by option C. from among the possible question options.

C. The spacecraft will begin to move and it will continue moving until it is stopped by an equal and opposite force

Reason:

The possible question options obtained from a similar question includes;

A. The spacecraft will move for some time then stop slowly

B. Air resistance will prevent the spacecraft from moving

C. The spacecraft will begin to move and the motion will continue until a force equal and opposite to the applied force stops it

D. The quick push will not cause the spacecraft to move, as a quick push works on Earth only

The state of the space craft = Motionless

Location of the spacecraft = Deep space

Type of force applied = Quick push

The statement that describes what will happen = Required

Solution;

Let F, represent the force applied, and let Δt be the duration of the applied force, we have;

The impulse of the force, F × Δt = m·(v₂ - v₁)

Where;

m = The mass of the spacecraft

v₁ = The initial velocity of the spacecraft = 0

v₂ = Final velocity of the spacecraft

Plugging in v₁ = 0, gives;

F × Δt = m·v₂

The space craft is given a velocity, v₂, and according to Newton's First Law of Motion, it continues moving in a straight line until another force acts on it

Therefore, the correct option is option C. The spacecraft will begin to move and the motion will continue until it is stopped by an equal and opposite force

Learn more about Newton's First Law of Motion here:

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Answer:

Displacement = 8.4m

Explanation:

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[tex]v = 60.7m {s}^{ - 1} \: u \: = 5.26m {s}^{ - 1 } \: t = 15s \: \: \: \: \: \\ a \: = \frac{v - u}{t} \\ a \: = \frac{60 .7- 5.26}{15} \\ a = 3.7m {s}^{ - 28} \\ {v}^{2} = {u}^{2} + 2as \\ {60.7}^{2} = {5.26}^{2} + 2 \times 3.7 \times s \\ 60.7 =27 .7 + 2 \times 3.7s \\60.7 = 29.7 \times 3.7s \\ 60.7 - 29.7 = 3.7s \\ 31 = 3.7s \\ \frac{31}{3.7} = \frac{3.7s}{3.7} \\ s = 8.4m[/tex]

Explanation:

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