60 points to whoever answers

Encoding is the process of adding information into a wave. For instance, when you talk, you’re encoding information into a sound wave. How could you encode information into a wave? Choose 1 answer:
A: The speed of a wave can be varied along with the information

B: The amplitude of a wave can be kept constant

C: The frequency of a wave can be varied along with the information

Answer:

The maximum compression of the spring after the collision is 0.15 m

Explanation:  

Given data  

Mass of the block (m) = 0.80 kg  

Initial velocity (v) = 1.2 m/s  

Spring constant (k) = 50 N/m  

Find the maximum compression of the spring (x) after compression  

Potential energy of the spring = Kinetic energy of the block  

Kinetic energy of the block = 0.5 × (mv)²  

Kinetic energy of the block = 0.5 × (0.80 × 1.2)²  

Kinetic energy of the block =0.5 × 0.9216  

Kinetic energy of the block = 0.4608 ---------->(1)  

Potential energy of the spring = 0.5 × k × x²  

Potential energy of the spring = 0.5 × 50 × x²  

Potential energy of the spring = 25 x² ---------> (2)  

Equate (1) and (2)  

25 x² = 0.4608  

x² =  0.018432 m²  

x =0.1357 = 0.15 m  

Therefore the maximum compression of the spring after collision is 0.15 m

Find the momentum of a 15 kg object traveling at 7 m/s.

The momentum of an object is found by using the following formula:

\(\displaystyle p=mv\)

In this question, the object is 15 kg and is travelling at 7 m/s. That means the mass is 15 kg and the velocity is 7 m/s.

Since all the needed variables are found, substitute it into the equation:

\(\displaystyle p=mv \rightarrow p=15 \times 7\)

Multiply:

\(\displaystyle p=105\ kg \times m/s\)

__________________________________________________________

What is the momentum? 105 kg · m/s

What is the velocity? 7 m/s

What is the mass? 15 kg

What equation did you use to solve? p = mv

__________________________________________________________

Answer:

F= 1.67 x \(10^{-13}\)N

Explanation:

I used this equation:

F = GMm/R²

Where M is mass 1

where m is mass 2

where R is distance

where F is gravitational force

Each of the five friends needs to pay £12 to cover the cost of their own meals and contribute towards the birthday person's meal. Using mean allows us to distribute the cost equally among the friends, ensuring a fair division of expenses for the meal.

To determine how much each of the five friends needs to pay, we can use the concept of averages (mean) and divide the total cost by the number of people paying.

In this scenario, the total cost of the meal for 6 people is £12 per person. Since the other 5 friends have decided to pay for the birthday person's meal, they will collectively cover the cost of their own meals plus the birthday person's meal.

To calculate the total cost covered by the five friends, we can subtract the cost of one person's meal (since the birthday person's meal is being paid by the group) from the total cost. The cost of one person's meal is £12.

Total cost covered by the five friends = Total cost - Cost of one person's meal

= (£12 x 6) - £12

= £72 - £12

= £60

Now, to find out how much each of the five friends needs to pay, we divide the total cost covered by the five friends (£60) by the number of friends (5).

Amount each friend needs to pay = Total cost covered by the five friends / Number of friends

= £60 / 5

= £12

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The specific latent heat of fusion of ice obtained from this experiment is approximately 583.33 J/g.

To determine the specific latent heat of fusion of ice using the given experiment, we need to consider the energy transferred during the process.First, we need to calculate the energy lost by the water to cool down from 25 °C to 0 °C. The energy lost is given by:

Q1 = m1 * c * ΔT1

Where:

m1 = mass of water = 100 g

c = specific heat capacity of water = 4.2 J/g °C

ΔT1 = change in temperature = (0 °C - 25 °C) = -25 °C

Q1 = 100 g * 4.2 J/g °C * (-25 °C) = -10,500 J

Next, we calculate the energy released by the water to freeze and cool the remaining ice. The energy released is given by:

Q2 = m2 * Lf

Where:

m2 = mass of ice = 18 g

Lf = specific latent heat of fusion of ice (to be determined)

Q2 = 18 g * Lf

Since energy is conserved in the system, the energy lost by the water (Q1) is equal to the energy released by the water (Q2):

-10,500 J = 18 g * Lf

Solving for Lf:

Lf = -10,500 J / 18 g = -583.33 J/g

The negative sign indicates that energy is being released during the process of freezing.

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The torques can be the same if the force causes a turning through a larger distance for the steering wheel.

Torque is a measure of rotational force, or the force that causes an object to rotate about an axis or pivot point. It is typically represented as a vector quantity with units of Newton-meters (Nm) or pound-feet (lb-ft).

We know that the magnitude of the torque would have to do with the force and the distance that the force has turned and either of the values that we increase will increase the torque.

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Answer:

electromagnetic waves, physical contact

Explanation:

The sun transfers heat to earth through electromagnetic radiation. This method of heat transfer is evidence that direct contact is not necessary for heat to move from place to place.

Heat transfer is defined as the flow of heat or thermal energy from one point to another due to the temperature difference between the two points.

Here,

Due to the temperature difference between, heat transfer occurs between two points through various methods such as conduction, convection and radiation.

Conduction is the process of heat transfer through which heat is transferred between two objects that are in direct contact with each other. It can occur in solids, liquids and gases.

Convection is the process of heat transfer through which the heat is transferred by the movement of fluids. Air and water currents are the examples for it.

Radiation is the process of heat transfer in which the heat is transferred in the form of electromagnetic waves.

The heat energy from the sun reaches the earth through the phenomenon called electromagnetic radiation. Mainly infrared radiations carry the heat towards earth.

Unlike conduction and convection, radiation does not require any matter to transfer the heat energy.

Hence,

The sun transfers heat to earth through electromagnetic radiation. This method of heat transfer is evidence that direct contact is not necessary for heat to move from place to place.

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Answer:

25 ohms

Explanation:

Hi there!

Ohm's law states that \(V=IR\) where V is voltage, I is current and R is resistance.

Plug the given information into Ohm's law (V=50, I=2) and solve for R

\(V=IR\\50=2R\)

Divide both sides by 2 to isolate R

\(\frac{50}{2}= \frac{2R}{2} \\25=R\)

Therefore, there are 25 ohms of resistance present in this circuit.

I hope this helps!

Answer:

f = 25 lbs

m = 5 lbs

a =?

f = ma

25 = 5 a( divide both sides by 5)

a = 5(lbs)

Answer:

The answer would be a

Explanation:

Answer:

LOL "use correct spelling" to an engineer type is probably the hardest part of this problem!!!

Net force is 0 N

The forces are balanced and no change occurs to the velocity of the object.

                        4 N ───→ ┌┐ ←──────────── 12 N

          8 N ────────→ └┘

The forces are balanced and the net force on the object is zero.

Net force acting on an object is defined as the vector sum of all the forces acting on it.

Here,

A force of 8 N is acting towards the east, a force of 12 N is acting towards the west and a force of 4 N is acting towards the east on the object.

The free body diagram represents the force vectors acting on the object.

From the diagram,

The forces 8 N and 4 N are acting on the same direction and the 12 N force is acting in the opposite direction.

So, the resultant of the forces 8 N and 4 N are opposite to the 12 N force.

Resultant of 8 N and 4 N = 8 + 4 = 12 N towards east.

The rest force acting is 12 N towards west.

Now, resultant shows that they are equal and opposite.

Therefore, the net force on the object is zero. ( since 12 N east and 12 N west cancels each other).

That means the forces are balanced and so they cancel each other.

Hence,

The forces are balanced and the net force on the object is zero.

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Attaching the image here.

Answer: 0.9

Explanation:

If frequency equals the amount of oscillations in one second then 20/18 = f = 1.11  and to find period (T) then we use the equation T= 1/f or in this case 1/1.11 = 0.9

Answer:

NO

Explanation:

I dont care

Answer:

a: after 1 seconds it will have fallen 0.2452

after 2 seconds it will have fallen 0.981

after 3 seconds it will have fallen 2.2072

after 4 seconds it will have fallen 3.924

Explanation:

the formula for acceleration due to gravity is (ignoring friction I think)

g = G*M/R^2

earths gravitational constant is about 9.807

g = 9.807*M/R^2

The average weight of a brick is 5 pounds and I'm going to say it's 10 feet off the ground.

g = 9.807*5/10^2.         g = 0.4905 so every second the brick will go 0.4905 fps faster. (fps means feet per second.)

after 1 seconds it will have fallen 0.2452

after 2 seconds it will have fallen 0.981

after 3 seconds it will have fallen 2.2072

after 4 seconds it will have fallen 3.924

Answer:

There are 26 protons in nucleus of Fe atom. There are 26 electrons in Fe atom. Fe atom loses 2 electrons and change to Fe2+ ion.

Explanation:

A. The block has a higher force than the friction, so it continues moving and increasing the speed

B. The block has a lower force than the friction, so the acceleration is negative and the speed decrease

Answer:

D. 12.5 min

Explanation:

Speed = distance ÷ time.

time = distance ÷ speed.

18km × 1000m = 18000m (as speed is in m/s).

time = 18000m ÷ 24.0m/s

t = 750s.

750s ÷ 60

= 12.5mins is your answer.

hope this helps. :)

Answer:

Explanation:

Sure, I'd be happy to help you with the question!

Let's denote the input as x. According to the function machine, the input is multiplied by 6 and then 80 is subtracted from the result to obtain the output.

So, the function can be written as:

Output = (6 * x) - 80

Now, the problem states that the input is the same as the output. Therefore, we can set up the equation:

x = (6 * x) - 80

Let's solve this equation to find the value of x:

x = 6x - 80

Subtracting 6x from both sides, we get:

x - 6x = -80

Combining like terms, we have:

-5x = -80

Dividing both sides by -5, we find:

x = (-80) / (-5)

Simplifying the expression, we have:

x = 16

Therefore, the input (x) that results in the input being the same as the output is 16.

To work out these types of questions, it's important to carefully read the instructions and understand the operations being performed in the function machine. Then, you can set up an equation with the input and output, and solve for the unknown value. Always double-check your solution to ensure it satisfies the given conditions of the problem.

Answer:

16

Explanation:

(x*6) - 80 = x

Multiply the parentheses

6x - 80 = x
Add 80 to each side to get
6x = x + 80
Subtract x from both sides to get
5x = 80
Divide both sides by 5
x = 16

Answer:

669.1 ft and 743.1 ft

Explanation:

Given data

Lenght of wire= = 1000ft

Angle =  42˚

Applying SOH CAH TOA

1. How tall is the tower?

SOH

sine ∅= opp/hyp

sin 42= opp/1000

0.6691= Opp/1000

0.6691*1000= Opp

Opp=669.1 ft

Applying SOH CAH TOA

2.How far away from the base of the tower does the wire hit the ground?

CAH

cos ∅= adj/hyp

cos 42= adj/1000

0.7431*1000=adj

adj=743.1 ft

Answer:

Approximately \(31\%\) assuming that \(g = 9.81\; {\rm N \cdot kg^{-1}}\).

Explanation:

Consider an object of mass \(m\) in a uniform gravitational field of strength \(g\). If the height of that object increased by \(\Delta h\), the gravitational potential energy of that object would increase by \(m\, g\, \Delta h\).

In this question, the mass of the rocket is given to be \(m = 0.55\; {\rm kg}\). Assume that \(g = 9.81\; {\rm N \cdot kg^{-1}}\). The rocket has gained a height of \(\Delta h = 23\; {\rm m}\). Thus, the gravitational potential energy of this rocket would have increased by:

\(\begin{aligned} m\, g\, \Delta h &= 0.55\; {\rm kg} \times 9.81\; {\rm N \cdot kg^{-1}} \times 23\; {\rm m} \\ &\approx 124.1\; {\rm J} \end{aligned}\).

In other words, the useful energy output from the combustion of the rocket fuel was approximately \(124.1\; {\rm J}\).

The energy input to this rocket was given to be \(400.0\; {\rm J}\). Thus, the efficiency of the energy conversion would be:

\(\begin{aligned} \text{efficiency} &= \frac{(\text{useful energy out}\text{put})}{(\text{energy in}\text{put})} \times 100\% \\ &\approx \frac{124.1\; {\rm J}}{400.0\; {\rm J}} \times 100\% \\ &\approx 31\%\end{aligned}\).

Answer:

false is the correct answer

Answer:

false

Explanation:

The speed of propagation depends only on the wavelength of the wave.speed of propagation is constant in a given medium; only the wavelength changes as the frequency changes.

A constant acceleration for an object guarantees that its velocity will change continuously throughout time and not remain constant.

Similarities.Acceleration and velocity are both vector quantities, meaning they have both a magnitude and a direction.Both expressions are capable of being zero, positive, or both.

The rate at which in displacement is known as velocity.The rate at which velocity changes is called acceleration.Due to the fact that it includes both magnitude and direction, velocity is an vector quantity.As the rate at which velocity changes, acceleration is likewise a vector quantity.

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Answer:

1.Plants roots hold the soil in place.

On colliding, the truck applies a force on the stationary car, and the stationary car applies an opposite force on the truck. The front of the truck is designed to crumple in order to absorb the impact of the collision, which protects the well-being of the passengers.

Answer:

B, the number of protons.

Explanation:

It is the number of protons found in the nucleus of the atom.

The time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

An echo is a repetition or reflection of a sound or signal. It can be caused by sound waves bouncing off a surface, signal interference, or the repetition of a message in communication.

The speed of sound in air at room temperature is approximately 343 meters per second. When a person claps, the sound waves propagate outward in all directions and reach the school building, where they bounce off and return to the person as an echo. The time it takes for the sound to travel the distance to the building and back to the person is the time interval between the clap and the echo.

To calculate the time interval, we can use the following formula:

time = distance / speed

where distance is the total distance traveled by the sound (twice the distance from the person to the school building), and speed is the speed of sound in air.

distance = 2 x 300m = 600m

speed = 343 m/s

time = 600m / 343 m/s = 1.75 seconds (rounded to two decimal places)

Therefore, the time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

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The mass of the metal ball is approximately equal to 0.1 kg.

Freefall is a type of motion in which an object falls with gravitational acceleration without resistance from air, surface, or medium. In a freefall, the only force acting on an object is the force of gravity. In a freefall, the acceleration of an object is given by the formula:  `g = 9.81 \(m/s^2`\)

The final velocity of a freefalling object can be calculated using the formula: `v = g*t `Where v is the final velocity, g is the gravitational acceleration, and t is the time taken to reach the final velocity. The force acting on an object is equal to the product of the mass of the object and the acceleration acting on the object. This is known as Newton's Second Law of Motion.

The formula for calculating force is:  `F = ma`.Where F is the force acting on the object, m is the mass of the object, and a is the acceleration acting on the object.Given that the velocity of the metal ball at the moment of striking the ground was 30 m/s, and that it stopped after penetrating the sand for 0.01 s, we can calculate the mass of the metal ball using the formula for force.

We can assume that the force acting on the metal ball is equal to the average resistance force of the sand against the motion of the ball.

The formula for calculating force is: `F = ma`.

Rearranging the formula, we get: `m = F/a` .

Substituting the given values, we get:  `

m = -3010/10`

Thus, the mass of the metal ball is approximately equal to 0.1 kg.

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Answer:

a circular path

Explanation:

In a magnetism field if a charged particle having a charge of magnitude '' enters  such that its velocity vector V is 90° to the direction of the magnetic field "B'', then it will experience a force, called Lorentz force F

\(F = V\times B\)

According to the property of cross-product, the Lorentz force (F) acting on the particle will be perpendicular to the instantaneous position of the particle, making the path of the particle to be a circular path.