Your friend is sitting on another train traveling west at 29 m/s. as you walk toward the back of your train at 3.7 m/s, what is your velocity with respect to your friend?

Answer: a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

Explanation: Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms.

They are far apart r=1.52×10−14m

For the force due to electromagnetism we use Coulomb’s inverse square law:

F=[tex]K_{e}[/tex] [tex]\frac{q1 q2}{r^{2} }[/tex]

(where  F  is the electrostatic force,  q1  &  q2  are the two charges,  r  is the distance between them, and Coulomb’s Constant  

ke = 1/4πϵ0 =8.99×109 Nm2[tex]C^{-2}[/tex],

where  ϵ0  is the permittivity of free space

r = [tex]\sqrt[2]{k_{e}\frac{q1 q2}{F} }[/tex]

r= [tex]\sqrt{8.99*10^{9}Nm^{2} C^{-2}\frac{-1.60*10^{-19}*-1.60*10^{-19} }{1.0N} } }[/tex]

r = 1.52×10−14m

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The potential energy of the charge-field system change is decreases

As a proton is a positively charged particle, it experiences the force against the electric field, directed from point 2 to 1 , which is constant, given by,

F = e×E,  right to left. When a proton is moved in such a way from point 1 to point 2, work done is against the force & the potential energy increases U = F×d = e×E×d.

But an electron is negatively charged, with the same value, so that force experienced is along the field. Thus work is done by the field itself & potential energy decreases. It is similar to a body which falls under gravity.

Hence the option decreases/ decreases is correct.

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The data which Marcus most likely collected during his investigation is a quantitative data.

A quantitative data is also referred to as a numerical data and it can be defined as a data set that is primarily expressed in numbers only. This ultimately implies that, a quantitative data (numerical data) simply refers to a data set consisting of numbers rather than words.

In Science, there are different types of graph and these include the following:

A line graph is sometimes referred to as scatter chart, scatter plot, scatter diagram or scattergram and it can be defined as a type of graph which is used for the graphical representation of the values of two (2) variables in a quantitative data, with the resulting points showing any association (correlation) between the data set.

In this context, we can reasonably infer and logically deduce that the data which Marcus most likely collected during his investigation is a quantitative data because a line graph is generally used to represent quantitative data.

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The change in internal energy of a gas as it cools is 94 J.

According to the First Law of Thermodynamics,

ΔU = q + w

Here  ΔU represents the change in internal energy

Q represents the heat added to the system

W represents the work done on the system

In the given case, work is done on the system, and heat is removed from the system.

Hence, W = 200 J AND Q= -106 J.

Putting the above values in the standard equation

ΔU = 200 - 106

ΔU = 94 J.

Hence, the change in internal energy is 94 J.

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The descriptions of the points in the heating curve of water are:

A heating curve for a substance is a curve which show the phase changes that occur in the substance as the substance is heated over a period of time.

The addition of heat to substances result in an increase in volume and a change of state.

Water can exist in the three physical states of matter, which are solid, liquid, and gas.

A graph showing the changes that occur in water as heat is added to it is referred to as the heating curve of water.

Considering the heating curve of water shown, water exists first as a solid, then liquid, and finally a gas as heat is added to it.

The various descriptions of the point in the heating curve of water are as follows:

Leg A: solid warms from -40C to OC

Leg B: melting

Leg C: Liquid warms from O °C to 100 °C

Leg D: Evaporation

Leg E: Water vapor warms from 100C

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By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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The solid pieces of lead with a mass of 29.92 g has a density of 11,164 Kg/ m3.

To find the density the given values are,

v = 2.68 cm3

m = 29.92 g

The density is a mass of a unit volume of a material substance. It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

Density is a scalar quantity.

The unit of density is kg/m³.

The density formula and the procedure we will use is:

ρ = m/v

Where:

v= volume

ρ= density

m= mass

Applying the density formula, we get:

ρ = m/v

ρ = 29.92 g/ 2.68 cm3

ρ(g/cm3) = 11.164 g/cm3

Converting the density from (gram g /cm3) to (kilogram/m3), we get:

11.164 g/cm3 * (1 kg/1000g) * (1000000 cm3/1 m3) = 11,164 Kg/ m

11.164 g/cm3 is equivalent to 11,164 Kg/ m3

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When the mass is increased by 4, the frequency would decrease by a factor of 2 hence we have 0.795 Hz.

We know that a simple harmonic motion is a motion that is directed towards the center of the motion. The acceleration has the center as its direction.

We must first be able to obtain the angular velocity and then use it to obtain the velocity of the body that is undergoing the simple harmonic motion.

Now, we have;

ω = √k/m

ω = angular velocity

k = spring constant

m = mass of the object

ω = √10 N/m/1 kg

ω = 10 rad/s

And

ω = 2πf

f = ω/2π

f = 10 rad/s 2 * 3.14

f = 1.59 Hz

If we increase the mass by 4, the frequency would decrease by a factor of 2 hence we have 0.795 Hz.

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Answer: the velocity is -2

Explanation: good luck don't think its wrong everyone calls me the human calculator

Answer: The least count error is the error associated with the resolution of the instrument. A metre ruler may have graduations at 1 mm division scale spacing or interval. A Vernier scale on a caliper may have a least count of 0.1 mm while a micrometer may have a least count of 0.01 mm or 10 microns.

Explanation:

The least count of an instrument is the smallest measurement that can be taken accurately with it.

For example, if an ammeter has 5 divisions between the marks 0 and 1A, then its least count is 1/5 = 0.2 A or it can measure current up to the value 0.2 accurately.

The force constant of the spring is calculated as 0.57 N/cm.

Hooke’s law states that the force that acts on an elastic substance is directly proportional to the extension as long as the elastic limit is not exceeded. We know that the statement of Hook’s law can only apply to an object when the object is still within the range of elasticity. If the object has reached the point where it has become plastic, that is, the  object has completely lost all of its elasticity, then  we could say that the Hook’s law can not hold in such an instance.

Mathematically, we could write;

F = Kx

F = force that causes the stretching of the object

K = the force constant

X = the extension.

We know that in the plot of the force against the extension, the slope is the force constant. Taking two points on the graph, it is possible to obtain the force constant as follows;

K = 2 – 0/3.5 – 0

K = 0.57 N/cm

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It takes 3.16s to hit the bottom of the well.

g = 9.8 m/[tex]s^{2}[/tex]

y = 9.8t m/[tex]s^{2}[/tex]

y = [tex]\frac{9.8 t^2}{2}[/tex] = 4.9[tex]t^{2}[/tex] m

When y =49, we have to find t

49 = 4.9[tex]t^{2}[/tex]

10 = [tex]t^{2}[/tex]

t = [tex]\sqrt{10}[/tex] = 3.16 s

Gravity causes a body to descend faster, and as it does, the air resistance that slows it down rises.

This keeps happening until the weight of the object and the force of air resistance are equal. The terminal velocity is the pace at which the item now falls instead of accelerating any longer.

When an object moves, it is said to be in motion under gravity since gravity has an impact on the object’s motion.

GRAVITY is the force that pulls things downward. In actuality, gravity pulls objects toward the Earth’s center.

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Yes the normal force from a floor on a suitcase always equal in magnitude to the weight of the suitcase.

What is normal force?

The part of a contact force that is perpendicular to the surface that an object encounters is known as the normal force. In this context, normal refers to perpendicular in a geometric sense rather than "usual" or "expected" as it does in everyday parlance. Gravity acts on a person standing stationary on a platform. If there weren't a countervailing force from the resistance of the platform's molecules, known as the "normal force," gravity would draw the person down toward the Earth's core.

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18 Mg/ L is the amount of work done.

It should be converted to energy in order to move an object. Energy can be transferred by the use of force. Work done refers to the amount of energy used by a force to move an object. A force must be applied in order for work to be completed, and there must also be motion or displacement in the force's direction. The amount of force multiplied by the distance moved in the force's direction is known as the work done by a force acting on an item.

Assume that the element's length at distance x from the table is dx.

Let's assume that W= M/L* dx*g(x) and that the entire work completed will take up 1/3 of the table.

W=M/L g(x)dx W=M/L g(x)dx

W= 18 MgL

​

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The value of intE after the following statements are executed  is calculated as 6

Simplification :

IntE = intC /IntD

IntE = [tex]\frac{20}{3} = 6.66[/tex]

IntE = 6.6

What does one mean about programming?

Programming is that the process of creating a set of instructions that tell a computer how to perform a task. Programming are often done using a variety of computer programming languages, like JavaScript, Python, and C++

What is the main purpose of programming?

The purpose of programming is to find a sequence of instructions that will automate the performance of a task (which can be as complex as an operating system) on a computer, often for solving a given problem.

Why is it important to review programming?

Learning to code not only allows you to offer machines instructions, but it also teaches you abstract thinking and problem-solving. In fact, problem-solving skills and creativity are key to becoming a successful programmer . Of course, you'll also have to know some coding languages to apply your knowledge

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The value to strain  is 0.00105.

When an object or medium is stressed, it deforms. Strain is the number that describes this distortion (deformation is experienced by objects or physical medium as a result of external forces—for). Strain is expressed as a fractional change in length (when under tensile stress), volume (when under bulk stress), or shape (under shear stress). As a result, strain is a dimensionless quantity. Tensile strain is strain produced by tensile stress, bulk strain (or volume strain) is strain generated by shear stress, and shear strain is strain induced by shear stress.

Strain = changes in length/ Original length

Strain = dL/L

= 0.21/200

= 0.00105

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After 0.85s, the ball would be at the same height.

A ball is thrown upward from the ground with an initial speed of 23.4 m/s; at the same instant, another ball is dropped from a building 20 m high....  

We know that from the equation of motion,

h = u t + 1/2 at^2

So h = height, u is initial velocity and t is time, a is acceleration  

Now for the ball thrown upwards  

h = 23.4 t – 1/2 gt^2

23.4 t – h = 1/2 gt^2

Now for the ball dropped downwards

20– h = 1/2 gt^2

Comparing both the equations we get

23.4t – h = 20 – h

23.4 t = 20

So t = 20/23.4

Or t = 0.85 secs

The balls will be at same height when t = 0.85 s

Gravity causes a body to descend faster, and as it does, the air resistance that slows it down rises.

This keeps happening until the weight of the object and the force of air resistance are equal. The terminal velocity is the pace at which the item now falls instead of accelerating any longer.

When any object moves, it is said to be in motion under gravity. This is because gravity has an impact on the object’s vertical motion.

Gravity is the force that pulls things downward. In actuality, gravity pulls objects toward the Earth’s center.

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Answer:

3.58

Explanation:

160 + 80 = 240

240 / 67  = 3.58

The average velocity of the student who walks 160 m east and 80 m west in 67 s is 1.194 m/s.

It is defined as the rate of change of displacement with respect to time.

Mathematically -

v = Δx/Δt

Given is a student who walked 160m east and then 80m west in 67 s.

Assume east direction as + x direction and west direction as - x direction, then →

Displacement 1 = 160 a[x]

Displacement 2 = - 80 a[x]

Displacement = Δx = 160 a[x] + 80 {- a[x]} = 80a[x]      

Time elapsed = Δt = 67 seconds

Where (a[x] is unit vector along x - axis and -a[x] along negative x - axis)

Therefore, the magnitude of average velocity of the student will be -

v = |Δx|/Δt

v = 80/67

v = 1.194 m/s

Therefore, the average velocity of the student who walks 160 m east and 80 m west in 67 s is 1.194 m/s.

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The prediction of the meteorologist, the family is to expect a severe rain as they embark on the vacation. Option A

The term climate refers to the average weather condition of a place over a long period of time. The weather in a place changes from time to time. The weather of a place could be forecasted by a meteorologist. The meteorologist is a scientist that has been trained in the science of how to interpret weather patterns and also make predictions.

The meteorologist can be able to use the tools of the profession to discern what could be the weather condition of a place at any given point in time and announces the same by the process of giving a weather forecast.

Hence, the local meteorologist predicts that a cold front will move in; this implies that there is a cooler mass of air near the surface.

This implies that from the prediction of the meteorologist, the family is to expect a severe rain as they embark on the vacation.

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The 50 kg mass of the student, and the duration of 2 seconds for the motion of the elevator, gives;

1) 2,400J

2) 1,600 J

3) 1,600 J

4) 2,000 J

5) 2,000 J

6) 2,000 J

Work done, W = Force × Distance

Mass of the student = 50 kg

Time of motion of the elevator = 2 seconds

Acceleration due to gravity, g = 10 m/s²

1) Direction of motion = Upwards

Initial velocity = 0

Upward acceleration = 2 m/s²

Height climbed, h = 0.5×2×2² = 4

Force of the student, F = m•g

F = 50 × 10 = 500

Apparent weight of student = 500 + 50×2 = 600

Therefore;

W = F × h

Work done = 600 × 4 = 2499

2) When the elevator is accelerating downwards, we have;

Apparent weight = F - m•a

Which gives;

Apparent weight = 500 - 100 = 400

W = 400 × 4 = 1600

3) Initial speed of elevator = 4 m/s

Deceleration = 2 m/s²

Distance, h = 4×2- 0.5×2×2² = 4

Apparent weight = 500 - 100 = 400

Work done = 400 × 4 = 1600

4) Direction of motion = Downwards

Distance, h = 4

Apparent weight = 500 + 100 = 600

5) The distance covered, h, is therefore;

h = 2 × 2 = 4

W = m•g•h

Which gives;

W = 50 × 10 × 4 = 2000

6) Height traveled, h = 4

Work done = 50 × 10 × 4 = 2000

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The silver ant at a constant speed of 50 cm/s to run from san diego to new york city it would take: 102.789 days

The formula and procedure we will use to solve this exercise is:

t = x/v

Where:

Information about the problem:

By converting the velocity units from (cm/s) to (mi/s) we have:

v =50 cm/s * 1 mile/160,900 cm

v = 3.1075 *10^-4 mi/s

Applying the time formula we have that:

t = x/v

t = 2,760 mi / 3.1075 *10^-4 mi/s

t = 8.881 *10 ^6 s

By converting the time units from (s) to (days) we have:

t = 8.881 *10 ^6 s * 1 h/3600 s * 1 day/24 h

t= 102.789 days

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

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The given statement is true.

The design of the product should be changed in order to increase the capacity of product. Incorporating ideas like modular designs can make the process more efficient.

Modular design enables the customization, repurposing, upgrading, or maintenance of product designs. Furthermore, the modular product’s various components adhere to a common interface to seamlessly assemble into the final product. Numerous consumer goods, including automobiles, smartphones, laptops, and televisions, frequently feature modular design. Large websites, software engineering, and software product design are some further instances of modular design.

Modular designed products are easy to customize according to the needs of the customers, which eventually increase the sales and production.

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Answer:

92 meters

Explanation:

23/0.25

It is going 23 meters per second and can slow down by 0.25 meters per second

The runway should be 253.5m for a light plane that needs to reach a speed of 39 m/s for takeoff.

The rate at which the speed and direction of a moving object vary over time is called as acceleration. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.

In physics, acceleration is the rate at which the velocity of an object changes in relation to time.

According to Newton’s Second Law, the sum of all forces acting on an item results in its acceleration.

Meter per second squared (m s2) is the unit of acceleration used in the SI system.

We know from the equation,

V^2 = u^2 + 2as → 1

Here a = acceleration of the light plane

v = final velocity of the light plane

u = initial velocity of the light plane

s = length of the runway

Then we also know that

s = (v^2 - u^2) / 2a → 2

v = 39m/s

u = 0m/s

a = 3 m/s^2

Then substituting these values in equation 2,

s = (39^2 - 0) / (2x3)

s = 1521/6

s = 253.5 m

The runway needed is 253.5m long.

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The statements that apply to life sciences are;

Life science has to do with the study of living things. This is the area of study that we call biology. It is a discipline that has many facets and we always seek to understand living things and how they relate with their environment as well as other living things.

The following are the statements that apply to the life sciences;

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Missing parts;

Which statements are real-world applications of life science? Check all that apply.

Farmers study plant growth and are able to grow more fruits and vegetables.

Doctors can determine what is wrong with a patient and prescribe the right medicine.

Scientists study weather patterns to provide information about future weather

Scientists can track animal movements and predict where they might be feeding

Dentists recommend you brush and floss daily because bacteria cause tooth decay

Answer: A, B, D, E

Explanation:

A. Farmers study plant growth and are able to grow more fruits and vegetables.

B. Doctors can determine what is wrong with a patient and prescribe the right medicine.

D. Scientists can track animal movements and predict where they might be feeding.

E. Dentists recommend you brush and floss daily because bacteria cause tooth decay.

The focal length (in cm) of the lens is 400

The distance between a lens's center and its focus is known as the focal length of a convex lens. An optical device's focal length, which is just the inverse of the system's optical power, measures how strongly/sharply the system converges or diverges light.

A plane mirror is one having a flat surface, as those found frequently in home mirrors. It has an infinite focal length. Its optical power is 0 since it does not cause light to converge or diverge.

Given:

n=1.5

R2 = 20 cm

R1= ∞ since it is a flat surface

1/f = (n-1) (1/R1-1/R2)

Substituting values,

1/f = (1.5- 1) (1/∞-1/20)

1/f = (0.5) (-1/20)

= 1/400

F=400

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The international system of units is also known as SI units. It was introduced to remove the confusion between many units. According to standard international form, the SI units of various quantities are listed below:

Mass = kg

Length = m

Time = s

Force = N

To obtain the SI units of the following dimensions, they must be converted to universal standard by expressing them by the given relations:

mm-mN = ×10-3 * x10-3 = 1 x10-6 N.m

mg/mm = ×106 kg /10-3m = 1×109 kgm-1

km/ms = ×103 m /x10-3 s = 1×106 ms-1

kN/(mm)2 = ×103 / ×10-3 = 1×106 Nm-2

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The height through which the player will jump is determined as 44.1 m.

The height through which the player will jump at the given time is calculated as follows;

h = vt + ¹/₂gt²

where;

v is the initial velocity of the basketball player

Substitute the given parameters and solve for the height jumped by the player.

h = 0 + ¹/₂(9.8)(3²)

h = 44.1 m

Thus, the height through which the player will jump is determined as 44.1 m.

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The change in charge in respect to the vacuum permittivity constant is referred to as the electric flow.

In other words, this expression might be represented numerically as

Ф=q/∈[tex]_{0}[/tex]

Here,

∈= Electric Flux

q = Charge

∈0 = Vacuum Permittivity

Replacing with our values and solving to find q, we have,

-1850N.[tex]m^{2}[/tex]/C=[tex]\frac{q}{8.854x10^{-2}C.N^{-1}.m^{-2} }[/tex]

q=-1.63799x[tex]10^{-8} C[/tex]

Therefore the charge is enclose within the octahedron with a charge of

q=-1.63799x  [tex]10^{-8} C[/tex]

The charge of protons is positive (+).

The charge on neutrons is zero.

The charge of an electron is negative.

We just search for the protons and neutrons to determine the charge of an atom.

Two protons and two electrons are given to us.

Charges of +2 and -2 result in 0 charges.

It is a neutral atom, this one.

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