can someone Please help

Answer:

64.5

Explanation:

(m1 + m2) v initial = (m1 * v1 final) + (m2 * v2 final)

(92 + 8)(-7) = (92 x 2) + (8 x v2 final)

(100)(-7) = (184) + (8 x v2 final)

-700 = (184) +  (8 x v2 final)

-516 =  (8 x v2 final)

-516/8 = v2 final

-64.5 = v2 final

Answer:

The correct answer is D. Electrons in an atom that can bond with other atoms.

Explanation:

For those of you that need it still

B) The gravitational force exerted from the planet on Moon A is eight times larger than the gravitational force exerted from the planet on Moon B

Answer:

Explanation:  

When objects collide, energy can be transferred from one object to another, thereby changing their motion. In such collisions, some energy is typically also transferred to the surrounding air; as a result, the air gets heated and sound is produced.

Answer:

Explanation:

Convex lens refers to the lens which merges the light rays at a particular point, that travels through it.

Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses.

Answer:

constant volicty of the pumper when they hit ground 7.03-/s

Answer: -38000 J

Explanation:

Khan approved

The truck skids to a distance of 25 meters with a force of 1500 N then the change in kinetic energy for the truck will be equal to 37,500 J.

The force which a moving object has is referred to as kinetic energy in physics. It is defined as the number of effort required to propel a person of a specific mass from still to a specific velocity. Aside from slight fluctuations in speed, your body holds onto the kinetic energy it obtains during acceleration.

When the body slows down from its present level to a condition of rest, the exact same quantity of energy is used.

Formally, kinetic energy is any quantity that has a gradient with respect to time in the Lagrangian of a system.

As per the given data in the question,

Force, F = 1500 N

Distance, d = 25 m

Use the equation for change in kinetic energy:

Δ K.E = F × d

= 1500 × 25

Δ K.E = 37,500 J.

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Answer:

Transformers use “electrical steel” alloys. ... From 1% to 6.5% silicon is added, as well as a small amount (up to 0.5%) of manganese and aluminum to reduce brittleness in alloys with higher percentages of silicon. Electrical steels are formulated and processed to have low hysteresis and eddy-current losses.

Explanation:

The eddy currents consume energy and heat the iron core. The designers of the electrical machines and transformers laminate the core with thin sheets of iron coated with a thin oxide layer.

To reduce Eddy current loss in the transformer, the iron core is constructed of laminated silicon steel and has a unique insulated coating.

Instead of employing a solid iron block, this can be accomplished by laminating the core, which is constructed from a collection of metal plates that are adhered together.

With less current flow, efficiency loss, and heat waste, this has the desired effect of raising electrical resistance inside the core. Low hysteresis and eddy-current losses are achieved by the formulation and processing of electrical steels.

The iron core is heated by the eddy currents, which use energy. The core of electrical devices and transformers is laminated with thin sheets of iron covered in a thin oxide layer by the designers.

Therefore, Transformers use alloys known as “electrical steel.” To lessen brittleness in alloys with larger percentages of silicon, between 1% and 6.5% silicon is added, along with a tiny amount (up to 0.5%) of manganese and aluminum.

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Answer:

I think kilogram.

Explanation:

If you refer to science book you can find.

Given that,

Combined weight of a student and the waxed skis, W = 850 N

It should be given that the coefficient of friction is 0.05.

To find,

The magnitude of the normal force exerted and the magnitude of the force of friction.

Solution,

Normal force = weight of the object,

Here, weight = 850 N

Normal force = 850 N

Let f is the force of friction. It can be calculated as follows :

[tex]f=\mu N\\\\=0.05\times 850\\\\=42.5\ N[/tex]

Hence, the normal force is 850 N and the magnitude of the force of friction is 850 N.

Answer: 43

Explanation:

Answer:

The final speed of the arrow when it hits the target is 45.63 m/s.

Explanation:

Given;

spring constant of the bow, k = 458 N/m

extension of the bow, x = 0.72 m

mass of the arrow, m = 0.0925 kg

let the initial speed of the arrow after being fired = u

Apply the law of conservation of energy, the elastic potential energy of the bow will be converted to kinetic energy of the arrow.

[tex]\frac{1}{2} kx^2 = \frac{1}{2} mu^2\\\\kx^2 = mu^2\\\\u^2 = \frac{kx^2}{m} \\\\u= \sqrt{\frac{kx^2}{m} } \\\\u = 50.66 \ m/s[/tex]

The speed of the arrow when it hits a target 24.7 m above the ground is calculated as;

v² = u² + 2gs

where;

v is the final speed when the arrow hits the target

g is acceleration due to gravity = (-9.8 m/s², upward motion)

v² = 50.66² + 2(-9.8)24.7

v² = 2566.44 - 484.12

v² = 2082.32

v = √2082.32

v = 45.63 m/s

Therefore, the final speed of the arrow when it hits the target is 45.63 m/s.

Answer:

270Joues

Explanation:

Step one:

given data

Force F= 45N

distance moved d= 6m

Required

The work done in moving the block 6m

Step two:

We know that the expression for the work done is

WD= force* distance

WD= 45*6

WD=270Joues

Answer:

A increases

Explanation:

#CarryOnLearning

Answer:

a = 0.8 [m/s²]

Explanation:

To solve this problem we must use Newton's second law which tells us that the resulting force on a body is equal to the product of mass by acceleration, in this way we come to the following equation:

∑F = m*a

where:

F = forces applied [N]

m = mass = 1000 [kg]

a = acceleration [m/s²]

Now using Newton's second law.

[tex]1200 - 400 = 1000*a\\800 = 1000 *a\\a=0.8[m/s^{2} ][/tex]

a

a

a

a

it all depends on you moving the object

Answer:

fluids

Explanation:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

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Answer:

neutrons have a negative charge is incorrect

Explanation:

neutrons are neutral

Answer:

Explanation:

Neutrons and protons are found in the nucleus of an atom. Unlike protons, which have a positive charge, or electrons, which have a negative charge, neutrons have zero charge which means they are neutral particles.

current passing through wire

number os turns on core

the nature of the core material

the shape and size of the core or the material

Answer:”a” or “d”

Explanation:

I say it will not move because they are moving the objects in the same equal of force so it will most likely stay motionless or might rotate toward the two of the students according to the amount of force they are using

Answer:

Explanation:

let's find the acceleration

[tex]v = u + at \\ 8 = 0 \times a \times 2.5 \\ \alpha = 3.2m {s}^{ - 2} [/tex]

then distance

[tex] {v}^{2} = {u}^{2} + 2as \\ {8}^{2} = 2 \times 3.2 \times s \\ \\ s = 10m [/tex]

Answer:

Hey mate I shall not tell you the answer I shall explain it to you after this if still you can't understand then say

Explanation:

Derive v = u + at by Graphical Method. Consider the velocity – time graph of a body shown in the below Figure

Derive s = ut + (1/2) at2 by Graphical Method. Velocity so time graph to derive the equations of motion.

Derive v2 = u2 + 2as by Graphical Method. Velocity–Time graph to derive the equations of motion.

I hope you understand now

enjoy your day

#Captainpower :)❤❤

Answer:

27J  

3528J

Explanation:

First problem:

Given parameters:

Mass of tennis ball  = 0.06kg

Velocity of tennis ball  = 30m/s

Unknown:

Kinetic energy  = ?

Solution:

Kinetic energy is the energy due to the motion of a body.

It is expressed as:

       K.E  = [tex]\frac{1}{2}[/tex] m v²  

       K.E =  [tex]\frac{1}{2}[/tex]  x 0.06 x 30²   = 27J  

Second problem:

Given parameters:

Mass = 30kg

Height  = 12m

Unknown:

Potential energy  = ?

Solution:

Potential energy is the energy due to the position of a body.

  Mathematically;

       Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now;

          Potential energy  = 30 x 9.8 x 12  = 3528J

Answer:

The momentum and the kinetic energy remains constant.

Explanation:

A uniform circular motion is defined as the motion of a body which moves in a constant speed or at the same speed during the motion.

In the context, it is given that a satellite is moving around the earth in a circular orbit at a constant speed. The satellite has certain momentum as well as energy.

We can conclude that the kinetic energy and the momentum of the satellite remains constant as the momentum and kinetic energy depends on the speed of an object And here the speed of the satellite is constant, so the moment as well as the kinetic energy of the satellite remains constant while moving in a circular path.

Answer:

The positive end of battery 1 touching the negative end of battery 2 and wires connecting the negative of battery 1 to the light light bulb and the positive of battery 2 to the light bulb.

Explanation:

They undergo internal fertilization. They lose their tails as adults. They have wet, moist skin. They have long, strong legs. They begin life with gills.

Answer:

Its vertical speed increases, and its horizontal speed remains the same.

Explanation:

Given that,

A baseball player throws a ball horizontally,

We know that,

A baseball player throws a ball horizontally, then vertical component of gravity will be increases but there is no acceleration in horizontal direction

So, horizontal velocity remains same.

Hence, Its vertical speed increases, and its horizontal speed remains the same.

If a baseball player throws a ball horizontally, the statement which best  describes the ball's motion after it is thrown is: B. Its vertical speed increases, and its horizontal speed remains the same.

Speed can be defined as the distance covered by an object per unit time.

Generally, speed has magnitude but no direction and as such it is a scalar quantity.

Mathematically, speed is given by the formula;

[tex]Speed = \frac{distance}{time}[/tex]

For the vertical component of speed:

The vertical speed of an object increases with respect to the distance covered by the object as a result of the effect of acceleration due to gravity.

For the horizontal component of speed:

The horizontal speed of an object remains the same with respect to the distance covered by the object because there isn't any gravitational force acting on it.

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Answer:

so it would be 60N divide by 30kg which gives you 20m/s²

Explanation:

Acceleration will increase bc acceleration is the change in speed and direction so if you increase the force it is most to to faster

Answer:

B. Solid rock breaks apart.

Explanation:

Answer:

B

Explanation:

I did it on a test lol