how does the current in a resistor change if the voltage across the resistor is decreased by 4

The correct option is d) it decreases. A sound wave transfers energy through a medium by particle vibrations, creating compressions and rarefactions that propagate as longitudinal waves.

A sound wave transfers energy through the medium primarily by the vibrations of the particles in that medium. This propagation occurs as a longitudinal wave, which means the particle displacements are parallel to the direction of the wave's travel. The speed at which sound travels depends on the medium's rigidity (or compressibility in gases) and its density. Sound waves travel faster in more rigid or less dense materials and slower in less rigid or denser materials.

Key Points About Sound Waves:

Energy Transfer: Sound waves transfer energy through particle vibrations in the medium.

Question:

Which best describes the energy of a sound wave as it travels through a medium?

a. it remains the same

b. It increases.

c. It depends on the medium

d. it decreases.

Answer:

[tex]F_{o}=12800 N[/tex]  

Explanation:

Let's use the Pascal principle:

[tex]P_{i}=P_{o}[/tex]

[tex]\frac{F_{i}}{A_{i}}=\frac{F_{o}}{A_{o}}[/tex]

Where:

F(i) is the input force, 200 N

F(o) is force exerted on the piston  

A(i) is the area of the plunger (A =πr(i)²)

A(o) is the area of the piston (A =πr(o)²)

[tex]F_{o}=\frac{A_{o}F_{i}}{A_{i}}[/tex]

[tex]F_{o}=\frac{r_{o}^{2}F_{i}}{r_{i}^{2}}[/tex]

[tex]F_{o}=\frac{0.8^{2}*200}{0.1^{2}}[/tex]                

[tex]F_{o}=12800 N[/tex]              

I hope it helps you!                    

Answer:

(C)- About 5 billion years ago

Explanation:

4.6 Billion Years rounds up to 5 Billion Years

Answer:

unknown

Explanation:

Psi communication: The term "Psi communication" was initially originated in an article named 'Mass Communication and Para-Social Interaction' during 1956 by Donald Horton, and is also denoted as "parasocial interaction". It is described as a phenomenon that involves "one-sided interaction" between people, encompassing the viewer knowing a specific celebrity well whereas the viewer himself or herself is being completely unknown for the celebrity in return.

In the question above, the given statement represents that the Psi communication is responsible for transforming via an unknown process as one of its members are considered as unknown of the transfer, so the correct answer would be "unknown process".

Answer:

2, 8 and shell

Explanation:

Neon as atomic number 10. Since for each shell, electrons equal 2n².

When n = 1, 2n² = 2(1)² = 2

When n = 2, 2n² = 2(2)² = 8

So it fills both the first and second shell with 2 and 8 electrons respectively to achieve its stable atomic state. The rest of the 8 electrons go into the second shell because the first shell has achieved its stable dual configuration of two electrons. The next shell requires a maximum of 8 electrons to achieve stability so, the remaining electrons fill it up to achieve the stable octet configuration.

Answer:

a. 0.882 N b. 9.8 m/s² c. 6.42 m/s

Explanation:

a. The net force acting on the ball is its weight W = mg were m = mass of ball = 90 g = 0.090 kg and g = acceleration due to gravity = 9.8 m/s²

W = mg = 0.090 kg × 9.8 m/s² = 0.882 N

b. The acceleration = g = acceleration due to gravity = 9.8 m/s² since it is falling freely

c. Using v² = u² + 2as where v = final velocity of ball, u = initial velocity of ball = 0 m/s, a = acceleration of ball = 9.8 m/s² and s = height = 2.1 m. Substituting the values of the variables, we ave

v² = u² + 2as = 0² + 2(9.8 m/s²) × 2.1 m = 41.16

v = √41.16 = 6.42 m/s

Final answer:

The force that knocks an object moving forward sideways is an external force, as described by Newton's first law of motion. This could be due to a collision, friction, or other forces changing the object's direction, like the effect felt during a sharp turn in a car.

Explanation:

The force you are asking about, when an object moving forward gets knocked sideways, is typically called an external force. In accordance with Newton's first law of motion, which states that an object will maintain its state of motion unless acted upon by a net external force, this sideways force changes the object's state of motion. In real-world situations, several forces can act as this external force, such as friction, tension, normal force, or even another object colliding with the one in motion.

For example, if an object like a rolling ball is knocked sideways by another ball, the sideways force is the result of the collision between the two balls. This changes the direction of the ball's momentum, creating a new motion path. Similarly, when a car makes a sharp turn, the force exerted by the friction between the tires and the road surface is what changes the direction of the car's velocity. This is why you might feel a force pushing you sideways in the seat, often referred to as a centrifugal effect, which is in fact the inertia of your body wanting to continue in a straight line.

Answer:

Explanation:

Given that,

Kinetic energy of an automobile is 2300J

K.E = 2300J

The formula for kinetic energy is

K.E = ½mv²

So, if the speed of the automobile is increased by 6, what is the kinetic energy

Now v' = 6v.

The mass of the automobile is constant.

Therefore, the kinetic energy is

K.E' = ½mv'²

Where v' = 6v

K.E' = ½m(6v)²

K.E' = ½m × 36v²

K.E' = 36 × ½mv²

Where, from above ½mv² = 2300J

Then,

K.E' = 36 × 2300 = 82,800J

The kinetic energy of the automobile when it increase it's speed is 82,800J

When the automobile moves with six times the initial speed, its kinetic energy will be 82800 J.

The kinetic energy (KE) of an automobile is given by the formula:

[tex]\[ KE = \frac{1}{2}mv^2 \][/tex]

where[tex]\( m \)[/tex]is the mass of the automobile and [tex]\( v \)[/tex] is its velocity.

If the automobile's kinetic energy is 2300 J at a certain speed, then we can denote this initial kinetic energy as [tex]\( KE_{initial} \)[/tex]and the initial speed as[tex]\( v_{initial} \)[/tex]. We have:

[tex]\[ KE_{initial} = \frac{1}{2}mv_{initial}^2 = 2300 \, \text{J} \][/tex]

When the automobile moves with six times the initial speed, its new speed is [tex]\( v_{new} = 6v_{initial} \).[/tex] The new kinetic energy[tex]\( KE_{new} \)[/tex]can be calculated using the same formula:

[tex]\[ KE_{new} = \frac{1}{2}m(6v_{initial})^2 \] \[ KE_{new} = \frac{1}{2}m \cdot 36v_{initial}^2 \] \[ KE_{new} = 36 \cdot \frac{1}{2}mv_{initial}^2 \] \[ KE_{new} = 36 \cdot KE_{initial} \][/tex]

Since [tex]\( KE_{initial} = 2300 \, \text{J} \)[/tex], we substitute this value into the equation:

[tex]\[ KE_{new} = 36 \cdot 2300 \, \text{J} \] \[ KE_{new} = 82800 \, \text{J} \][/tex]

The answer is: 82800.

Answer:

[tex]\Delta V = 1.440\times 10^{-6}\,m^{3}[/tex]

Explanation:

El coeficiente de expansión volumétrica se calcula a partir de la siguiente ecuación diferencial parcial (The volumetric expansion coefficient is computed by means of the following partial differential equation):

[tex]\alpha = \frac{1}{V} \cdot \left(\frac{\partial V}{\partial T} \right)[/tex]

Se integra la fórmula a continuación (The formula is integrated herein):

[tex]\alpha\, dT = \frac{dV}{V}[/tex]

Supóngase que el coeficiente es constante (Let suppose that coefficient is constant):

[tex]\alpha \int\limits^{T_{f}}_{T_{o}}\,dT = \int\limits^{V_{f}}_{V_{o}}\, \frac{dV}{V}[/tex]

[tex]\alpha \cdot (T_{f}-T_{o}) = \ln \frac{V_{f}}{V_{o}}[/tex]

El volumen final es (The final volume is):

[tex]V_{f} = V_{o}\cdot e^{\alpha \cdot (T_{f}-T_{o})}[/tex]

El coeficiente de expansión volumétrica del acero es [tex]12\times 10^{-6}\,^{\circ}C^{-1}[/tex] (The volumetric expansion coefficient of steel is [tex]12\times 10^{-6}\,^{\circ}C^{-1}[/tex]):

[tex]V_{f} = (0.004\,m^{3})\cdot e^{(12\times 10^{-6}\,^{\circ}C^{-1})\cdot (50^{\circ}C-20^{\circ}C)}[/tex]

[tex]V_{f} \approx 4.001\times 10^{-3}\,m^{3}[/tex]

Finalmente, la dilatación experimentada por el balín es (Lastly, the dillatation experimented by the pellet is):

[tex]\Delta V = 4.001\times 10^{-3}\,m^{3} - 4.000\times 10^{-3}\,m^{3}[/tex]

[tex]\Delta V = 1.440\times 10^{-6}\,m^{3}[/tex]

La dilatación que sufre un balín de acero al pasar de 20 C a 50 C es de 0.00000432 m^3. Esta respuesta se obtiene aplicando la formula de dilatación volumétrica y asumiendo el coeficiente de dilatación volumétrica para el acero es de aproximadamente 0.000036 1/C.

El problema nos pide encontrar la dilatación del acero cuando su temperatura sube de 20 C a 50 C. La dilatación es un fenómeno físico donde los objetos cambian de tamaño debido a los cambios de temperatura. Para entender esto mejor, supongamos que es necesario calcular la dilatación volumétrica de un objeto hecho de acero cuando su temperatura cambia.

La fórmula general para el cálculo de la dilatación volumétrica es: ΔV = β·V0·ΔT, donde ΔV es la dilatación, β es el coeficiente de dilatación volumétrica (acero tiene un valor de aproximadamente 0.000036 1/C), V0 es el volumen inicial ( en este caso 0.004 m3) y ΔT es el cambio de temperatura en grados Celsius (50 C - 20 C = 30 C).

Entonces, sustituimos los valores en la fórmula: ΔV = 0.000036 1/C * 0.004 m3 * 30 C = 0.00000432 m3

Por lo tanto, cuando la temperatura del balín de acero aumenta de 20 C a 50 C, sufre una dilatación de 0.00000432 m3.

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Answer:

W = 285.62 N

Explanation:

It is given that,

Mass of Jessica is 55 kg

Slope of the hill is 32 degrees

We need to find the component of her weight that is along her direction of motion.

The component along her direction of motion is shown in attached figure. It means

[tex]W_y=mg\sin\theta\\\\W_y=55\times 9.8\times \sin(32)\\\\W_y=285.62\ N[/tex]

So, the component of her weight that is along her direction of motion is 285.62 N.

Answer:

286 rounded, - A P E X

Explanation:

Answer:

Explanation:

a) Mechanical Advantage is defined as the ratio of the load to the effort applied to an object. Mechanical advantage occurs when we can use a minimal effort to overcome a much larger load.

Mathematically; Mechanical advantage = Load/ Effort

Load =  400 lb car engine

Effort applied = Tension generated by the hand crank in the rope = 100lb

Mechanical Advantage = 400lb/100lb

MA = 4

b) Assuming the efficiency is 100%

Efficiency = Workdone by the machine/Work put in the machine * 100%

Workdone by the machine = work output = Force * distance moved by load

= 400*3

= 1200lbft

Work put in the machine = Work input = Force * distance moved by effort

Work input = 100*d

substituting into the equation;

100% = 1200/100d * 100%

1 = 1200/100d

100d = 1200

d = 1200/100

d = 12ft

The length of the rope required to complete the work is 12ft

Answer:

Its A

Explanation:

I took the test

The claim of the student that supported should be an object along with the positive charge along with will the movement towards the negative plate.

In terms of physics, the charged particle refer to the particle along with an electric charge. It should be ion like molecule or atom along with a surplus or deficit of electrons with respect to the b. In the case when the object should be considered as the positive charge should be movement towards the negative plate so the same should be considered as the student claim.

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Answer: Bases are slippery.

Explanation:

Bases and acids can be determined by the amount of hydrogen or hydroxide ions in each solution. If a solution has more hydrogen ions than hydroxide ions, it is acidic, whereas if it has more hydroxide ions than hydrogen ions, it is basic.

Using a litmus paper test for a acidic/basic solution, the paper will turn different colors. In an acidic solution, paper will turn red, but in a basic solution, paper will turn blue.

Bases, compared to acids, feel slippery on the skin because they interact with fatty acids on the skin. Comparatively, acids feel sticky.

Acids taste sour. Think of an acid like lemon juice, compared to bases, which taste bitter (blood, for example)

Answer:

What is a characteristic of a base? Is slippery

Explanation:

Have a great day.

Explanation:

1.

Initial speed of satellite is 30,000 m/s

Final speed of satellite is 15000 m/s

Time taken by the satellite to reach final speed is 60 s

The satellite’s acceleration is equal to the change in velocity divided by time taken. So,

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{15000 -30000}{60}\\\\a=-250\ m/s^2[/tex]

2.

Initial speed of a boat is 42 m/s

Final speed of a boat is 88 m/s

Time taken is 4 s

The acceleration of boat during this period is :

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{88-42}{4}\\\\a=11.5\ m/s^2[/tex]

Answer:

Explanation:

Displacement is the shortest distance possible between initial and final position.

As the athlete is in circular motion , displacement is zero. [ THis is because , the initial and final position is the same ]

Distance covered in 1 round = Circumference of the circle

Circumference of the circle = 2πr

Diameter = 200 m

Radius = 100 m

Distance covered in 1 round[ 40 sec ] = 2 × 22/7 × 100 = 628.57 m

Distance covered in 1 sec = 628.57 ÷ 40 = 15.71 m

2min 20 sec = 140 sec

Distance covered in 140 sec = 15.71 × 140 = 2199.4 m

For each complete round the displacement is zero. Therefore for 3 complete rounds, the displacement will be zero.

At the end of his motion, the athlete will be in the diametrically opposite position. That is, displacement = diameter = 200 m.

Hence, the distance covered is 2200 m and the displacement is 200 m.

Answer:

d. Newton's first law

I hope this helps you

The steel barrier in a truck acts as a protective measure due to Newton's first law of motion, or the law of inertia, which states that objects in motion tend to stay in motion unless acted upon by an unbalanced force.

The concept or principle that best explains why the cab of a truck is often separated from the load by a steel barrier is Newton's first law of motion. This law, also known as the law of inertia, states that an object at rest stays at rest, and an object in motion remains in motion with the same speed and in the same direction unless acted upon by an unbalanced force. In the case of a truck, if it were to suddenly stop or be involved in a collision, the load would tend to continue moving due to inertia. The steel barrier is there to prevent the load from entering the cab and possibly harming the occupants.

Inertia is a fundamental aspect of Newton's first law, indicating the resistance of any physical object to a change in its state of motion. The barrier serves as a safety feature to protect against the dangers posed by inertia; without it, any objects in the load could cause injury to those in the cab during a sudden stop or crash due to their tendency to keep moving forward.

Answer:

More than 150 meters

Explanation:

Answer:

more than 150 meters

Explanation:

Answer: Both Technician A and B

Explanation:

There is a similar process in using a pressure transducer and lab scope to using a vacuum gauge.

And also, the pressure transducer can be used to tie any issues to individual cylinders if paired with a second trace consisting of the ignition pattern. Therefore, both Technician A and B are correct.

Answer:

Explanation:

i really dont know im a 4th grader

Answer:

3.76

Explanation:

KE = 1/2 * m *v^2

v=[tex]\sqrt{2.4*2/340 *1000}[/tex]

Answer: D) a stone lies on the ground

Explanation:

Potential energy this is defined as the mechanical energy, energy stored, or energy created by the position of an object. Example; energy possessed by a ball while hanging at the top of a steep hill when about to roll down is called a potential energy. This is same as a stone which lies in a floor.

Answer:

The image distance is 17.56 cm

Explanation:

We have,

Height of light bulb is 3 cm.

The light bulb is placed at a distance of 50 cm. It means object distance is, u =-50 cm

Focal length of the lens, f = +13 cm

Let v is distance between image and the lens. Using lens formula :

[tex]\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{13}+\dfrac{1}{(-50)}\\\\v=17.56\ cm[/tex]

So, the image distance is 17.56 cm.

Final answer:

Explanation on how to calculate the image distance for a light bulb placed 50 cm away from a thin convex lens with a 13 cm focal length.

Explanation:

The image distance for the light bulb placed 50 cm away from a thin convex lens with a focal length of 13 cm can be calculated using the lens formula:

1/f = 1/do + 1/di

Where:

f = focal length of the lens (13 cm)

do = object distance from the lens (50 cm)

Solving for di, the image distance would be around 15.62 cm.

Answer:

to mack boats float

Explanation:

without it the boats will sink to the bottom

-- Buoyancy is used to bring crude oil from Saudi Arabi to refineries in the US. The oil is loaded into tanks that are part of supertanker ships. Buoyancy is created by their ship-shape, so they float on water, and they can be dragged across the ocean on top of the water.

-- Buoyancy is used for a cheap thrill on the weekend.  People drive out in the country and find a place where they can buy a ride under a hot-air balloon.  The balloon is filled with hot air from a propane burner under its opening, and then it rises up off the ground because of its buoyancy in cool air.

-- Buoyancy is used cleverly by factories, to get rid of their gaseous and particulate wastes.  The wastes are heated, and then blown into tall "smokestacks" connected to the factory.  Then they rise because of the buoyancy created by hot stuff in cool air.  When they leave the top of the smokestack, they keep rising for a while.  Then, weather systems blow them away from the factory, over into other people's neighborhoods, where they finally sink to the ground in places where nobody knows where they came from.

-- Buoyancy is used in teapots, coffee makers, and lava lamps.  A heat source is placed under the bottom of the container. Heat is conducted through the bottom of the container, and it heats the fluid that's in contact with the inside of the container on the bottom. The hot fluid rises to the top of the container, because of the buoyancy created by hot stuff surrounded by cool stuff.  At the same time, cool stuff flows in to take its place at the bottom.  

In pots and pans and tanks where buoyancy is used this way, the motion of the fluids up and down and around is called "convection".

Answer:

a. potential energy is converted into kinetic energy

Explanation:

potential energy is the energy something has when it isn't in motion, as the roller coaster goes down hill (moves) the potential energy is turned into kinetic energy

Answer:

Explanation:

change in momentum = m ( v - u )   ;   m is mass , V is final velocity and u is initial velocity .

= 250 ( 28 - 6 )

= 5500. N.s

for calculating magnitude of force we shall apply the concept of impulse

Impulse = F X t = m( v-u )    ;   F is force applied for time t .

F x 60 = 5500

F = 91.67 N .

force exerted = 91.67 N .

Change in momentum is 5500 N/S

The magnitude of the force exerted on the Scooter is 91.67 N

The calculation can be done as follows

The formula for change in momentum is;

m(v-u)

250(28-6)

250(22)

5500 N/S

The formula for magnitude of the force is

F ˣ 60= 5500

F= 5500/60

F= 91.67 N

Hence the magnitude of force is 91.67 N and the change in momentum is 5500 N/S

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Answer:

The speed of sound, in m/s, through air at this temperature is 343.5 m/s

Explanation:

Given;

distance traveled by sound, d = 1,687.5 meters

time taken for the sound to travel, t = 5 seconds

air temperature, θ = 10°C

Speed of sound = distance traveled by sound / time taken for the sound to travel

Speed of sound = d / t

                           = 1687.5 m / 5 s

                           = 337.5 m/s

Speed of sound at the given temperature is calculated as;

c = 337.5 + 0.6θ

c = 337.5 + 0.6 x 10

c = 337.5 + 6

c = 343.5 m/s

Therefore, the speed of sound, in m/s, through air at this temperature is 343.5 m/s

Answer: Cumulus

Explanation: Most large cloud fronts are made up of cumulus clouds, large storm clouds are cumulonimbus clouds.

Divide the change in velocity by the time interval

For the acceleration of an object, divide the change in velocity by the time interval.

To calculate an object's acceleration, divide the change in velocity by the time period. The right answer is: Divide the velocity change by the time period.

The rate at which an object's velocity varies over time is measured as acceleration. It is computed by dividing the velocity change by the time it takes for that change to occur. The acceleration formula is:

Acceleration = (Change in Velocity) / (Time Interval)

Thus, by determining the change in velocity (the difference between the final velocity and the initial velocity) and dividing it by the time interval, you can find the object's acceleration.

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Answer:

I do not have  enough information to tell

Explanation:

This is deduced due to the fact that if the net force due to B and C on A is zero, the charges on B and C could either be positive or negative depending on the charge on A.