The diagram below shows two points of a wave.

How many wavelengths separate point A and point B?
Group of answer choices

1.5

2.0

3.0

2.5

By balancing the force, we get :

100 - Frictional Force = ma

100 - μmg = ma

100 - μ(5)(10) = (5)(15)

50μ = 25

μ = 0.5  

Distance travelled by box in 5 seconds is :

[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]

Hence, this is the required solution.

We can change a gas to liquid by decreasing the temperature and increasing the pressure.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every element and substance has a precise range of temperatures and pressures at which it can change from one phase to another.

Each substance can transform into one of three phases: solid, liquid, or gas. At specific temperatures, every substance is in one of these three phases. The intermolecular forces acting on the material's molecules and atoms have a significant impact on the temperature and pressure at which the substance will change.

When we change a gas to liquid, we have to decrease in the temperature and increase in the pressure for this phase transition.

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C. Paramedic for a fire department

A Paramedic for a fire department is the type of employee would most likely spend the majority of work time in a vehicle. Hence, option C is correct.

putting out fires in their vicinity. preserving property and life in the event of localized flames. saving and safeguarding individuals in the event of a car accident, as well as in the event of other catastrophes.

An institution that offers services for fire prevention and suppression is known as a fire department or fire brigade. It is also sometimes referred to as a fire authority, fire district, fire and rescue, or fire service.

The name used in contemporary legislation and by government agencies for this is a fire and rescue service.

Thus, option C is correct.

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Answer:

ecdbaf

Explanation:

The logical order of the steps of the scientific method is as follows:

a. analyze the data -- 5

b. test the hypothesis - 4

c. form a hypothesis - 3

d. gather information - 2

e. state the problem - 1

f. draw conclusions - 6

Each experiment and research uses the scientific method to test their hypothesis or solving the problem. The scientific method is a step-by-step process to acquire knowledge about a particular problem. There are the following steps in the scientific method

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Answer:

the power of the lamp is 100 Watts

step by step explaining:

work done = energy consumed by the lamp = 100J

time = 10 seconds

power = 100 / 10 = 100J - 1 = 100w

[tex] \bf \underline{ \underline{Given}}[/tex]

[tex] \bf \underline{ \underline{To \: find \: out}}[/tex]

Calculate the power of lamp.

[tex] \bf \underline{ \underline{Solution}}[/tex]

Formula of power is work done divide by time taken.

[tex] \boxed{ \bf \: Power = \frac{work}{time} }[/tex]

[tex] \blue \bigstar \bf \: Putting \: the \: given \: values[/tex]

[tex] \implies \bf Power = \cancel \dfrac{1000}{10} [/tex]

[tex] \implies \bf \: Power = 100 \: watt[/tex]

Answer:

1) CO2

2) CO2 and CaO

3) MgO

4) H20 and O2

5) CaCl2, CO2, H2O

Explanation:

Now let us try to put down the reactions here;

1) C(s) + O2(g) -------> CO2(g)

2) CaCO3(s) -------> CaO(s) + CO2 (g)

3) 2Mg(s) + O2(g)------> 2MgO

4) 2H2O2(aq) --------> 2H2O(l) + O2(g)

5) CaCO3(s) + 2HCl(aq) ------> CaCl2(aq) + CO2(g) + H2O(l)

Note that a chemical reaction equation is only said to be balanced when the number of atoms of each element on both sides of the reaction equation are exactly the same.

Answer:

Broken glass

Explanation:

We know that,

[tex]{\boxed{\sf{v=u+gt}}}[/tex]

[ Put values ]

[tex]\begin{gathered} \implies \sf \: {0} \: = {20} + ( - 9.8) \times t \\ \\ \implies \sf \: 0 = 20 - 9.8t \\ \\ \implies \sf \: 9.8t = 20 \\ \\ \implies \sf \: t = \dfrac{20}{9.8} \\ \\ \implies \sf \: t = 2.04\end{gathered}[/tex]

Therefore, the time at which the stone reaches its maximum height will be 2.04 s.

Answer:

$v_f = = 7.9 \times10^3 \text{ m/s }$

Answer:125 J

Explanation:

Given

Mass of block [tex]m=10\ kg[/tex]

Initial velocity [tex]u=0\ m/s[/tex]

Final velocity [tex]v=5\ m/s[/tex]

According to the work-energy theorem, work done by all the forces is equal to the change in kinetic energy.

As the block is on the horizontal surface so, the work done by gravity is zero.

Work(W)=change in kinetic Energy

[tex]W=\dfrac{1}{2}m[v^2-u^2]\\W=\dfrac{1}{2}\times 10\times [5^2-0^2]=125\ J[/tex]

Answer:

The dominant feature in an open pit or quarry operation is the pit, a broad, deepened, often funnel-shaped area where overburden has been removed to access the material to be mined. This is where material extraction takes place.

Explanation:

Read my bio :)

Answer:

Wear and tear of an object is not desirable as it reduces its life. This is more so in case of moving parts in automobiles and machinery. Therefore, efforts are made to reduce friction between moving parts. Friction between moving parts is usually reduced by introducing a substance between the moving surfaces.

Explanation:

Answer:

c. 2.7 m/s

Explanation:

[tex]v = a.t + v_{0}\\a = g = 9.81 m/s^{2}} \\t=0.28 s \\v_{0} = 0\\=> v = 9.81 * 0.28 = 2.74 m/s[/tex]

Answer:Energy cannot be created or destroyed. It can be stored, or it can be transferred i.e. from a hot object to a cool object by conduction, convection or radiation.

Explanation:

Answer: Did you get the answers to any of this report?

Explanation:

Answer:

1 year later and still not answered....

Explanation:

Answer:

The force applied to a spring equals the product of the spring constant and the displacement.

Explanation:

From Hooke's law, the force required to extend or compress a spring by a distance is proportional to the distance. This means extension is proportional to force.

Mathematically it is stated as;

F= -k*x  where k is the spring constant and x is the displacement of the spring after adjustment.

Hooke's law is an example of elasticity property of a material which is the ability of the object to return to a normal shape after experiencing a distortion also called "restoring force"

Answer:

Option A

Explanation:

Answer:

162 units

Explanation:

Just did it on A pex

The equation for the energy from the data table shows how the amplitude of a mechanical wave varies with the energy it carries is E = 2 × A², and the energy, if the amplitude is 9 units, is 36 units.

The disturbance oscillates periodically (see the periodic motion) with a set frequency and wavelength in the simplest waves. While electromagnetic waves (see electromagnetic radiation) do not require a medium to travel through and can move through a vacuum, mechanical waves, like sound, need one. The characteristics of the medium determine how well a wave travels through it.

Given:

The energies are, 2, 8, 18, 32

The amplitudes are, 1, 2, 3, 4

Calculate the energy at 9 of amplitude as shown below,

The general formula can be E = 2 × A²

Here, A is the amplitude, and energy is E,

Plug the value of the amplitude

Energy = 2 × 9²

Energy = 2 × 18

Energy = 36

Thus, the energy is 36.

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Answer:

Yes, because the wrench is moving at the same speed as the sailboat.

The main difference is that a person on the ground would see the wrench moving diagonally, while a person on the boat would see the wrench falling straight down,

This difference in paths lead to the relativistic change in lengths.

Answer:

Explanation:

We shall apply law of conservation of momentum .

M and m be mass of man and boat . V and v be velocity of man and boat .

MV = mv

75 V = 30 v

2 .0 m/s is relative velocity of man wrt boat .

Given v + V = 2

V = 2 - v

75 ( 2 - v )  = 30 v

150 - 75 v = 30 v

150 = 105 v

v = 1.43 m /s

Answer:

D) Cells come from preexisting cells.

Explanation:

The universal i.e widely accepted cell theory was proposed in 1800's by the contribution of three scientists namely Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. They came together and proposed three main components that make up the cell theory today. The components are:

- All living things are composed of one or more cells.

- Cell is the basic and fundamental unit of life

- All cells come from preexisting cells.

Based on these three components of the cell theory, the statement that: "Cells come from preexisting cells" in the options is correct.

The electromagnetic waves are determined by the wavelength. Hence, the correct option is D.

Electromagnetic waves are made up of vibrating electric and magnetic fields. The electric and magnetic fields are mutually perpendicular to each other. EM waves are transverse in nature.

Electromagnetic waves can travel through the vacuum in the form of radiation. The EM waves travel with the speed of light 3×10⁸ m/s. EM waves have no mass and charge. These waves can carry energy in space.

The behavior of electromagnetic waves depends on its frequency and wavelength. EM waves are classified into 7 types based on its frequency and wavelength. They are classified from radio waves to  Gamma rays.

Frequency is inversely proportional to wavelength, f = c / λ. Higher frequencies have shorter wavelength and lower frequencies have longer wavelength.

Thus, the wavelength determines the radiation that an electromagnetic waves. Hence, the option D is correct.

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Answer:

If you haven't heard, Joe Biden would like to unite America.

It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."

The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."

If only it were that easy.

When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.

It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.

Explanation:

btw i would rather have him as president

Answer:

The initial velocity vector of the ball is;

[tex]\underset{u}{\rightarrow}[/tex] = 25·i + 19.6·j

Explanation:

The given parameters are;

The time of flight of the ball = 4 seconds

The horizontal distance from the plate at which the ball is caught = 100 m

Let 'u', represent the initial velocity, we have;

u × cos(θ) × t = u × cos(θ) × 4 s = 100 m

u × cos(θ) = 25 m/s...(1)

[tex]t = \dfrac{2 \cdot u \cdot sin(\theta)}{g} = \dfrac{2 \cdot u \cdot sin(\theta)}{9.8 \ m/s^2} = 4 \ seconds[/tex]

∴ 2·u·sin(θ) = 9.8 m/s² × 4 s = 39.2 m/s

[tex]\therefore \dfrac{2 \cdot u \cdot sin(\theta)}{u \cdot cos(\theta)} = 2 \cdot tan(\theta) = \dfrac{39.2 \ m/s}{25 \ m/s} = 1.568[/tex]

tan(θ) = 1.568/2 = 0.784

θ = arctan(0.784) ≈ 38.096°

The direction of the velocity  vector of the ball, θ ≈ 38.096°

From equation (1), we have;

u × cos(θ) = 25 m/s

∴ u = 25 m/s/cos(θ) = 25 m/s/cos(arctan(0.784)) = 31.7672787629 m/s

The magnitude of the initial velocity vector, u = 31.7672787629 m/s

The vertical component of the initial velocity, [tex]u_y[/tex] = u × sin(θ)

∴ [tex]u_y[/tex] = 31.7672787629 × sin(arctan(0.784))

Therefore, the initial velocity vector of the ball is approximately, v = 31.767 m/s in a direction 38.096° above the horizontal, from which we have;

u = uₓ·i + [tex]u_y[/tex]·j = 25·i + 19.6·j

[tex]\underset{u}{\rightarrow}[/tex] = 25·i + 19.6·j

Answer:

Hope the above picture might help you :)

Answer:

Sample Response: If temperature and surface area increase, then the time it takes for sodium bicarbonate to completely dissolve will decrease, because increasing both factors increases the rate of a chemical reaction.

Explanation:

Answer:

7.68m/s

Explanation:

At point A, height h= 0m where v=?

At point B, height of h = 3.01 m above the top of the ramp v= 0 m/s

The conservation of energy here will be energy at Point A equals energy at point B

g= acceleration due to gravity= 9.81m/s^2

(mgh + 1/2 mv^2)A = (mgh + 1/2 mv^2)B

✓But height h at point A= 0 m then energy at point A= 1/2 mv^2

✓At point B , the velocity v= 0 m/s, then Energy at point B= mgh

✓ if we equate both energy at point A and B we have

mgh=1/2 mv^2

Let us make v the subject of formula, and cancel out the "m"

v=√2gh

Then substitute the values

V= √2×9.81×3.01

V=7.68m/s

Hence, his initial speed (in m/s) at point A is 7.68m/s

Answer:

[tex]v=0m/s[/tex]

Explanation:

From the question we are told that

Mass of object[tex]M=10kg[/tex]

Amplitude[tex]A=0.10m[/tex]

SHM [tex]w=2.0 times per second.[/tex]

Distance from equilibrium [tex]0.10m[/tex]

Generally the equation for SHM displacement from equilibrium position is mathematically given by

[tex]v=Aw\sqrt{1-\frac{x^2}{A^2}}[/tex]

For [tex]x=0.10[/tex]

Therefore

[tex]v=Aw\sqrt{1-\frac{0.10^2}{A^2}}[/tex]

[tex]v=0.10*2\sqrt{1-\frac{0.10^2}{0.10^2}}[/tex]

[tex]v=0.10*2\sqrt{1-1}[/tex]

[tex]v=0m/s[/tex]

One revolution of the propeller corresponds to a rotation of 2π radians, so that the propeller has an initial angular velocity of

10 rev/s = (10 rev/s) • (2π rad/rev) = 20π rad/s

The propeller thus has an angular velocity ω at time t of

ω = 20π rad/s - (2.0 rad/s²) t

so that at t = 40 s, its angular speed is reduced to

20π rad/s - (2.0 rad/s²) (40 s) = (20π - 80) rad/s

Convert this to a rotation rate by dividing this result by 2π :

(20π - 80) rad/s = ((20π - 80) rad/s) • (1/(2π) rev/rad) ≈ -2.73 rev/s

which would suggest that the propeller has started to turn in the opposite direction at a rate of 2.73 rev/s.

Answer:

Loop of Wire

Explanation: