a wave is created by causing vibrations in particles of matter.

Answer:

The angle at which a projectile is launched is important because it determines the initial velocity of the projectile and the direction in which it will travel. The angle also affects the projectile's trajectory, or the path that it follows through the air. The steeper the launch angle, the higher the projectile will go and the farther it will travel horizontally. A shallower launch angle will result in a flatter trajectory that does not go as high or travel as far. Therefore, the angle at which a projectile is launched is a key factor in determining how far and how high it will go.

Explanation:

The angle is important when launching projectile motion because it in the calculation of the maximum height, range and time of flight, angle of launching  is as important as the magnitude of initial velocity.

When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's center (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.

Two distinct rectilinear motions occur simultaneously in a projectile motion:

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Answer:

Blankets

Explanation:

Answer:

the correct answers is blankets

Explanation:

Please give brainle

Wehn we take a photograph of rolling ball which is slowing down we can understand the point of application of the different forces which take place.

During the ball's ruling, the force of friction acts in a backward direction. This produces a torque that causes the ball to rotate. The force of gravity is one of the additional forces.

We can determine the ball's axis of rotation by watching how it moves. The diagram below shows the various forces that are at work on the ball. The ball can roll without slipping at the final stage.

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Answer:

To calculate the pressure exerted by water at the bottom of the tank, we need to use the formula:

Pressure = Density x Gravity x Height

where:

Density = 1000 kg/m³ (density of water)

Gravity = 9.81 m/s² (acceleration due to gravity)

Height = 12 m (height of the tank)

Substituting the values in the formula, we get:

Pressure = 1000 kg/m³ x 9.81 m/s² x 12 m

Pressure = 117,720 Pa (Pascals)

Answer:

Subsistence farming is growing food for your own and your family's direct consumption. Like a backyard vegetable garden, but with fruit, starch crops, and animals as well. Intensive agriculture is anything that really works the land hard. The inputs cost money, so it is generally only done for profit

hope it becomes helpful to you ☺️☺️

good luck

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 10 × 0.75

We have the final answer as

Hope this helps you

Answer:

The frequency heard is 576.78 Hz

Explanation:

The Doppler effect is defined as the apparent frequency change of a wave produced by the relative movement of the source with respect to its observer. In other words, this effect is the change in the perceived frequency of any wave motion when the sender and receiver, or observer, move relative to each other.

This is what happens in the first part of this problem, where the sender is train A and the receiver is train B. They are both moving in opposite directions. In this case, where both are in motion, the frequency perceived by the receiver will increase when receiver and transmitter increase their separation distance and will decrease whenever the separation distance between them is reduced. The following expression is considered the general case of the Doppler effect:

\(f'=f*\frac{v+-vR}{v+-vE}\)

Where:

f ', f: Frequency perceived by the receiver and frequency emitted by the issuer respectively. Its unit of measurement in the International System (S.I.) is the hertz (Hz), which is the inverse unit of the second (1 Hz = 1 s-1)

v: Velocity of propagation of the wave in the medium. It is constant and depends on the characteristics of the medium. In this case, the speed of sound in air is considered to be 343 m / s

vR, vE: Speed ​​of the receiver and the emitter respectively. Its unit of measure in the S.I. is the m / s

±, ∓:

We will use the + sign:

We will use the sign -:

In this case you are in a car traveling at 20 m/s and an ambulance is behind you traveling 35 m/s in the same direction.

In this case the receiver, you in the car, moves away from the emitter, while the emitter, the ambulance, approaches the receiver behind you in the same direction. So the frequency is calculated by the expression:

\(f'=f*\frac{v-vR}{v-vE}\)

Being:

and replacing:

\(f'=550 Hz*\frac{343 m/s-20 m/s}{343 m/s-35 m/s}\)

you get:

f'= 576.78 Hz

The frequency heard is 576.78 Hz

Answer:

D

Explanation:

Change in speed or direction is acceleration

An object accelerates when it is moving faster. Option A is corect.

The rate of velocity change concerning time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.

The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.

\(\rm a = \frac{v-u}{t}\)

Where,

u is the initial speed in m/sec

v is the final speed in m/sec

t is the time interval in sec

a is the acceleration in m/sec²

When an object is accelerating it speeds up.

Hence option A is correct.

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Inside a freely-falling elevator, there would be no apparent weight for you.So option B is correct.

Inside a freely-falling elevator, there is still a gravitational force acting on you. However, since both you and the elevator are falling at the same rate, you would experience a sensation of weightlessness. Your apparent weight, which is the force exerted on a body due to gravity, would be zero. This is because there is no contact force between you and the elevator floor that would provide a normal force to counteract gravity. Therefore, the correct option is that there would be no apparent weight for you.

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The type of galaxy which has arms that contain sites of active star formation and start close to a bulge in the center is: D. normal spiral.

A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.

Generally, a star comprises two (2) main interstellar hot gases and these include:  

I. Hydrogen (H).

II. Helium (He).

A galaxy refers to a collection of billions of stars, which are existing independently.

This ultimately implies that, the greatest number of stars are found in a galaxy.

According to astronomers, the galaxy is classified into four (4) main categories and these are:

Furthermore, spiral galaxies are divided into two (2) major groups such as:

I. Barred spiral.

II. Normal spiral.

A normal spiral is typically made up of arms containing sites of active star formation and it start close to a bulge in the center.

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Answer:

D) normal spiral

Explanation:

Whoever answered it practically wrote a life story. There's no need for an explanation; just get to the point and tell us the answer. But anways, the answer is D.

The effort required to lift the 20 kg mass in this wheel and axle system is 6.25 kg.

To determine the effort required to lift a mass of 20 kg in a wheel and axle system, we can use the concept of mechanical advantage and the given information.

The mechanical advantage (MA) of a wheel and axle system is the ratio of the radius of the wheel (Rw) to the radius of the axle (Ra). In this case, the ratio is given as 4:1, which means Rw/Ra = 4/1.

The efficiency (η) of the system is given as 80%, which can be expressed as a decimal value of 0.8.

Efficiency = (MA actual / MA ideal) * 100%

Since efficiency is the ratio of the actual mechanical advantage (MA actual) to the ideal mechanical advantage (MA ideal), we can rearrange the formula to find the MA actual:

MA actual = Efficiency * MA ideal

MA actual = 0.8 * (Rw/Ra)

Now, we can calculate the MA actual:

MA actual = 0.8 * (4/1)

MA actual = 3.2

The mechanical advantage is the ratio of the load (L) to the effort (E):

MA actual = L / E

Given that the load is 20 kg, we can rearrange the formula to solve for the effort:

E = L / MA actual

E = 20 kg / 3.2

E = 6.25 kg

Therefore, the effort required to lift the 20 kg mass in this wheel and axle system is 6.25 kg.

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The distance must you compress a spring with twice the spring constant to store the same amount of energy is 0.7071 cm.

Compression springs are coil springs that have the ability to store mechanical energy. These helical springs with an open coil offer resistance to compressive force. These springs compress, shorten, and absorb a significant amount of potential force when they are exposed to a compression stress.

After the load is decreased or eliminated by the stored energy, the springs are compelled to return to their original lengths and shapes. Compression springs shrink in size when weighted. Compression springs' spiral wires do not come into contact while they are relaxed, unlike extension springs, but do so when they are strained.

The energy stored is E = 1/2 kx².

E1 = E2

1/2 k(1)² = 1/2 (2k)x²

x² = 1/2 (1)²

x = 1/√2 cm

x = 0.7071 cm.

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The wavelength of radio waves broadcast by a radio station with a frequency of 1300khz would be 230.76 m

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

The wavelength is inversely proportional to the frequency of the wave as from the following relation.

C = νλ

As given in the question  the wavelength of radio waves broadcast by a radio station with a frequency of 1300khz,

By using the formula

C = νλ

3×10⁸ = 1300 ×10³×λ

λ = 3×10⁸/ 1300 ×10³

  = 230.76 m

Thus,the wavelength of the radio waves comes out to be 230.76 m.

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Answer:

The positive ball would go first to the negatively charged plate.

Explanation:

After which, it would hold a more negative charge. Due to the negative charge, it would travel towards the positive plate. Thereby, it would transfer negative electrons to the positive plate once more. In doing so, it would transfer positive protons to the negative plate. After which, it would hold more  negative electrons and be drawn towards the positive plate once more. The Process would continue until the once-positive and once-negative became neutral ( and were discharged.) Additionally, the ball hanging on the insulator thread would also be neutral and discharged.

The statement is wrong and the correct average speed of the student will be 3/2 or 1.5 miles per hour.

Given in the question,

The student climbs the mountain at a speed of 1 mile per hour, then the distance traveled by the student uphill is given by

Distance = Speed × Time,

Put in the values, we get

Distance = 2 × 1 = 2 miles

So the student travels 2 miles uphill and turns around and climbs back at 3 miles per hour.

So the time taken by the student to climb back is given by

Time = Distance/Speed

Time = 2/3 hr

So Now

Total distance traveled by the student = Uphill climb  +  Downhill Climb

Total distance traveled by the student = 2 + 2

Total distance traveled by the student = 4 miles

Total time taken = Time to climb uphill +  time to climb downhill

Total time taken = 2 +  2/3 hr

Total time taken = 8/3 hr

Now average speed is given by the formula,

Average Speed  =  Total Distance traveled/Total Time taken

Average Speed  = 4 / (8/3)

Average Speed  = (4 × 3) / 8

Average Speed  = 12 / 8

Average Speed  = 3/2 miles per hour

Therefore, the statement that the average speed will be 3 miles per hour is wrong and the correct average speed of the student will be 3/2 or 1.5 miles per hour.

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Answer:

well i'm not sure if which unit of measure you need but i think its 86.49 meters  tall.

Answer:

Average acceleration = 0.45 m/s²

Explanation:

Given the following data;

Initial velocity, u = 0m/s

Final velocity, v = 8.6 m/s

Time, t= 19 seconds

To find the average acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.

Mathematically, acceleration is given by the formula;

\(Acceleration = \frac{initial speed - final speed}{time}\)

Substituting into the formula, we have;

Acceleration = (8.6 - 0)/19

Acceleration = 8.6/19

Average acceleration = 0.45 m/s²

Answer:

I know 1, that is in the case of a burning of a candle.

Explanation:

Answer:

density=mass/volume

density=19.3

mass=x

volume=100

we are looking for mass so we have to change the subject formula to m=dv

which means mass is equals to density multiplied by volume

m= 19.3 x 100

which is 1930.

When an object is released with an initial velocity upward, the direction of its acceleration is typically downward.

This is because the force of gravity, which acts on the object, pulls it in the opposite direction to its motion. According to Newton's second law of motion, the net force on an object is equal to its mass multiplied by its acceleration. In this case, the force of gravity acts as the net force, causing the object to accelerate downward.

The acceleration due to gravity is approximately 9.8 meters per second squared on Earth, and it acts downward towards the center of the planet. Therefore, when the object is released with an initial velocity upward, the gravitational force causes it to decelerate and eventually change direction, resulting in a downward acceleration. This downward acceleration opposes the initial upward velocity of the object until it eventually reaches its peak and starts to fall back down under the influence of gravity.

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Answer:

spring force = -K × x , where X is elongation or compression in the spring. ( -) sigh shows that the spring force is opposite to the applied force to cause extension.

Potential energy = work done by spring force = integration of Force.

integrate the force (-K × x) over distance 0 to x .

U = 1/2 K × X^2 ( for elongation)

U = -1/2 × K × X^2 ( for compression)

The correct choice is the third option.

This comes from the fact that the packing material cushions the impacts of the content in case of a fall.

Therefore, the velocity of the ball just before it hits the ground is approximately 22.1 m/s. Therefore, the closest value to this option is 21.0 m/s.

When a ball of mass 0.25 kg falls from a height of 50 m, we can calculate its velocity using the principle of conservation of energy. According to this principle, the sum of the potential and kinetic energy of an object remains constant.

Therefore, we can equate the potential energy at the initial height to the kinetic energy at the final velocity.Let's calculate the potential energy of the ball at the initial height

:Eg = mghEg = 0.25 kg × 9.81 m/s² × 50 m

Eg = 122.625 J

This is the energy that the ball has due to its position. As it falls, this energy is transformed into kinetic energy. At the moment the ball reaches the ground, all the potential energy has been transformed into kinetic energy

.Ek = 1/2mv²Ek = Egv² = 2Ek/mv = √(2Ek/m)

Let's plug in the values we obtained:Eg = 122.625 Jm = 0.25 kgv = √(2Ek/m)

We obtain:v = √(2 × 122.625 J / 0.25 kg)v = √(245.25 J/kg)v = 22.116 m/s

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The sun is Yellow, red, orange, and blue. Therefore option B is correct.

The star is moving toward an observer. Therefore option B is correct.

39. The type of radioactive decay represented by the equation provided Gamma. Therefore option A is correct.

40. The statement is completed correctly by the information which states that the coal in Alberta has a lower carbon content than coal in other parts of Canada, resulting in reduced greenhouse gas emissions.

29. graph B depicts the relationship between gravitational field strength and the mass of the International Space Station orbiting Earth.

30. The correct sequence of colors representing the changing temperature from the surface to the atmosphere of the sun is Yellow, red, orange, and blue. Therefore option B is correct.

1. When a star undergoes a blue shift, it indicates that the star is moving toward an observer. Therefore option B is correct.

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Answer:

White

Explanation:

Red comes from the lowest energy range of and blue from the highest.

The horizontal force that is required to make the shoe slide is 2.1658N.

Horizontal force = static friction

Static friction = uMg

u is coefficient of friction

g = acceleration due to gravity

M is the mass of the body that is .0425 kg.

Force required = (0.52 x 0.425 x 9.8) N

= 2.1658N

A horizontal force is a force that operates in a direction parallel to the horizon. The cycle's speed tends to slow down due to an opposing force called air resistance force, which acts in the opposite direction. Both the applied force and the air resistance force are considered horizontal forces when the direction is taken into account. Jumps and horizontal medicine ball throws can help increase the horizontal force produced. The Standing Long Jump, Standing Triple Jump, and horizontal jumps over hurdles or boxes are some of these jumps.

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The items you own, including furniture, a house, or a car, are called "Material goods".

The correct answer is B - "Material goods"

What are material goods?

"Material goods are those which are tangible. They can be seen, touched and transferred from one place to another. For example, cars, shoes, cloth, furniture, buildings, etc., are all material goods. A material good is an item that consumers can purchase, sell, or trade for other items."

Hence, option B is correct.

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