You are moving a wagon with a friend's help you push on the left side of the wagon with 25 of force while your friend pulls from the right side of the wagon with a force of 15N,
What is the net force?

v² - u² = 2 a ∆x

where u = initial velocity (27 m/s), v = final velocity (0), a = acceleration (-8 m/s², taken to be negative because we take direction of movement to be positive), and ∆x = stopping distance.

So

0² - (27 m/s)² = 2 (-8 m/s²) ∆x

∆x = (27 m/s)² / (16 m/s²)

∆x ≈ 45.6 m

The stopping distance of car achieved during the braking is of 45.56 m.

Given data:

The initial speed of car is, u = 27 m/s.

The final speed of car is, v = 0 m/s. (Because car comes to stop finally)

The magnitude of deacceleration is, \(a = 8\;\rm m/s^{2}\).

In order to find the stopping distance of the car, we need to use the third kinematic equation of motion. Third kinematic equation of motion is the relation between the initial speed, final speed, acceleration and distance covered.

Therefore,

\(v^{2}=u^{2}+2(-a)s\)

Here, s is the stopping distance.

Solving as,

\(0^{2}=27^{2}+2(-8)s\\\\s = 45.56 \;\rm m\)

Thus, we can conclude that the stopping distance of car achieved during the braking is of 45.56 m.

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Answer:

43200 J

Explanation:

(1/2(mass)) (speed)^2

Answer:

d is the right answer

it's was helpful to you

Answer:

Trabajo = Δ E

Explanation:

Podemos escribir esta declaración como una ecuación que hace que sea muy fácil ver la relación: Trabajo = Δ E, donde E es energía, y la letra griega Delta significa ‘cambio en’. Entonces leemos esto como: trabajo = cambio de energía. Esto nos ayuda a comprender por qué no se realiza ningún trabajo en una pared que no se mueve.

The work- energy theorem states that the work done by the sum of  forces acting on an object is  equal to  the change in the kinetic energy of the object.

According to work -energy theorem, the force resulting in a work done which is equal to the change in kinetic energy of the object. When a force applied on a body results in a displacement of the body, it is said to be work done on the body.

Kinetic energy of an object is the energy generated by virtue of its motion. It related to the mass and velocity as written below:

Ke  = 1/2 mv²

Let, Vi be the initial velocity and Vf be the final velocity, then the change in kinetic energy is written as:

ΔKe =  1/2 mVf² -  1/2 mVi²

According to wok energy theorem, the work done is equal to the this kinetic energy change.

Hence, W = ΔKe.

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The mass and volume of a body are given, then the percentage error of the density of the body will be equal to 5%.

Mass per unit volume of a solid substance, density. Density is defined as d = M/V, where M stands for gravity, and V for volume.

The measure of density that will be most frequently used is grams per cubic centimeter. For instance, the density of Earth is 5.51 grams per cubic centimeter, whereas the density of water is 1 gram per cubic centimeter. Kg per cubic meter is another method for determining density.

Mass, M = 100±2% kg = 100±0.02 kg

Volume, V = 100±3% m³ = 100±0.03 m³

P =M/V

Use the error analysis method,

log P = log M - log V

Differentiate on both sides of the above equation,

dP/P = dM/M+dV/V

Check for maximum possible error:

dP/P = 0.02/100+0.03/100 = 0.05/100

dP/P = 5%.

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Because they used cutting-edge tools and technology to strengthen the signal and increase the range, the Swedish Space Agency was able to transmit a wifi signal over such a long area.

With a 2.4GHz frequency, Wi-Fi transmissions typically have a range of over 45 metres, or roughly 150 feet. You will have a reach of approximately 15 metres or 50 feet when using a 5Ghz frequency.

802.11g - Indoor effective ranges of 100–150 feet at 54 Mbps wireless throughput using a 2.4GHz transmission frequency. 802.11g and 802.11b can communicate at 11 Mbps.

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Answer:

E. Some charges in the region are positive, and some are negative.

Explanation:

Electric potential is given as;

\(V = \frac{W}{Q}\)

where;

W is the work done in moving a charge between two points which have a difference in potential

Q is quantity of charge in the given region

If the electric potential at a given point in the region is zero, then sum of the charges in the given region must be equal to zero. For the charges to sum to zero, some will be positive while some will be negative,.

Therefore, the correct statement in the given options is "E"

E. Some charges in the region are positive, and some are negative.

Answer:

i cant make funny joke

Explanation:

but i can be alive.

wait no, im failing at that currently.

Determine the magnitude of B-A is 53.68

1.4

Magnitude is a term used to describe size or distance. We can relate the magnitude of the movement to the size and movement speed of the object. The magnitude of a thing or an amount is its size. A car moves at a faster pace than a motorcycle, just in terms of speed.

Magnitude is the relative size of an object (mathematics). The mathematical term for a vector's length or size is the norm. By using the symbol |v|, the magnitude of a vector formula can be utilized to determine the length of a given vector (let's say v). This amount is essentially the distance between the vector's beginning point and ending point.

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The vector field that expresses the density of induced or permanent electric dipole moments in a dielectric medium is known as polarization density (also known as electric polarization or just polarization).

Thus, A dielectric is considered to be polarized when its molecules acquire an electric dipole moment when exposed to an external electric field.

Electric polarization of the dielectric is the term used to describe the electric dipole moment induced per unit volume of the dielectric material.

The forces that emerge from these interactions can be calculated using the polarization density, which also defines how a material reacts to an applied electric field and how it modifies the electric field. It is comparable to magnetization, which measures a material's equivalent response.

Thus, The vector field that expresses the density of induced or permanent electric dipole moments in a dielectric medium is known as polarization density (also known as electric polarization or just polarization).

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The stones needed to be dropped from the same height. The light stone is moving quicker than the hefty stone just as it touches the ground. The light stone is taller when it is first placed than the heavy stone is.

Energy is the ability to carry out work. Potential, kinetic, thermal, electrical, chemical, nuclear, and other forms may all exist for it.

There are numerous types of energy. Examples of these include: electromagnetic energy, chemical energy, nuclear or atomic energy, mechanical energy, gravitational energy, electrical energy, sound energy, and so on. Each form can be changed or transformed into the others.

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Answer:

The correct answer is C.

Explanation:

Edwin Hubble classified spiral galaxies according to the tightness of their spiral arms compared to the size of their nuclear bulges. This classification scheme, known as the Hubble sequence, is based on the observation that spiral galaxies can have different degrees of spiral arm tightness and different sizes of nuclear bulges. By comparing these two features, Hubble was able to divide spiral galaxies into three main categories: barred spirals, normal spirals, and flocculent spirals. The classification of a spiral galaxy into one of these categories depends on the relative size of its nuclear bulge and the tightness of its spiral arms.

Answer:

How did Edwin Hubble classify spiral galaxies?

according to the tightness of their spiral arms compared to the size of their nuclear bulges

Explanation:

Took the K12 test.

The velocity is 22 m/s while the acceleration is 12 m/s^2.

We know that the velocity can be obtained from the equation that have been given for the distance that is covered. We know that we have been given the distance that is covered as;  x = 20t + 6t^2

Then we know that;

Velocity = dx/dt = 20 + 12t

Velocity = 20 + 12(1) = 22 m/s

The acceleration can be obtained from;

Acceleration = d^2x/dt^2 = 12 m/s^2

Thus we have used the equation to obtain the velocity and the acceleration.

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Answer:

kinetic energy

Explanation:

Answer:

 F = (mg - kx)  i ^

Explanation:

Force and potential are related

         F = - (\(\frac{dU}{dx}\) i ^ + \frac{dU}{dy} j ^ + \frac{dU}{dz} k ^)

in this exercise we are told that the potential is

         U = - m g x + ½ kx²

let's make the drive

         \frac{dU}{dx} = -mg + kx

         \frac{dU}{dy}= 0

          \frac{dU}{dz} = 0

we substitute

         F = (mg - kx)  i ^

The vehicle has a 2000kg mass.

Take a mass's acceleration into account. Use the formula F = m a to determine the force's value. Kilogram-meter/second-squared will be used as the unit of force. The short name for this unit, which is made up of the three basic SI units, is newton.

F= ma

m= F/a

m= 50000/25

m= 2000 kg

According to Newton's Second Law of Motion, acceleration (gaining speed) occurs whenever a force acts on a mass (object). This law of motion is best demonstrated by riding a bicycle. The mass is your bicycle. The force that propels you forward on your bicycle comes from your leg muscles.

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Option C. The heat absorbed or lost by a substance while it's changing state  correctly describes latent heat

Latent heat is the heat absorbed or lost by a substance while it is changing state.

The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.

For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.

Latent heat is not associated with a temperature change; rather, it's associated with a change of state.

For instance, the temperature of water remains at 100°C while boiling.

When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.

When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.

Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.

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Answer:

Explanation:

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

From the question we have

workdone = 4 × 2

We have the final answer as

Hope this helps you

Answer:

The answer is "\(\bold{-98.079 ^{\circ} F \ \ and \ -2.6686 \frac{Btu}{lbm}}\)"

Explanation:

Calculating the value from the property tables of R-134a,

At 130 psia:

\(T_1= 95.64^{\circ} \ F\)

Internal energy:

\(u_1= 43.258 \ \frac{Btu}{lbm}\)

At 20 psia:

\(T_2= -2.43^{\circ} \ F\)

Internal energy

\(u_2= 40.5894 \ \frac{Btu}{lbm}\)

 Calculating temperature:

\(\to \Delta T= T_2-T_1\)

          \(= -2.43-95.64\\\\= -98.079^{\circ} \ F\)

  Calculating  internal energy:

\(\to \Delta u= u_2-u_1\\\\\)

          \(= 40.5894 -43.258 \\\\=-2.6686 \ \frac{Btu}{lbm}\)

The period of a wave is the time it takes the wave to complete one cycle (at a fixed location).

So if a wave completes one cycle in 2 seconds, then that is its period.

Answer:

Answer below, hope this helps!

Explanation:

1. Chemical - e

2.Light - b

3. Sound - g

4. Mechanical - f

5. Kinetic - a

6. Potential - d

7. Energy - j

8. Thermal - c

9. Nuclear - i

10. Electrical - h

Answer:

Chemical - e

Light - b

Sound - g

Mechanical - f

Kinetic - a

Potential - d

Energy - j

Thermal - c

Nuclear - i

Electrical - h

Explanation:

Explanation:

→ p = 3 kg × 3 m/s

→ p = 9 kg.m/s

Option D is correct.

Answer:

gravity wave

Explanation:

Answer:

The mass in grams of a red blood cell is about 7.85 ×  10⁻¹¹ grams

Explanation:

To find the mass in grams of a red blood cell,

From,

\(Density = \frac{Mass}{Volume}\)

Then,

\(Mass = Density \times Volume\)

From the question,

Density of a red blood cell is similar to that of water

Density of water = 1 g/mL = 1 g/ cm³

Then, Density of a red blood cell = 1 g/cm³

Now, we will find the volume a red blood cell.

From the question,  

Since the shape is like that of a thick disc, we can determine the volume by using the formula for volume of a cylinder.

Hence,

Volume of a red blood cell = \(\pi r^{2}h\)

Where \(\pi\) Is a constant (Take \(\pi\) = 3.14)

\(r\) is the radius

and \(h\) is the thickness

Diameter of a red blood cell = 10 micrometers

Then, radius of a red blood cell = 10/2 micrometers = 5 micrometers

\(r\) = 5 micrometers = 5 × 10⁻⁶ meters

and \(h\) = 1 micrometer = 1 × 10⁻⁶ meters

Hence,

Volume of a red blood cell = 3.14 × (5 × 10⁻⁶)² × 1 × 10⁻⁶

∴ Volume of a red blood cell = 7.85 × 10⁻¹⁷ cubic meter (m³)

Convert this to cubic centimeter

(NOTE: 1 cubic meter = 1000000 cubic centimeter)

Hence,

Volume of a red blood cell = 7.85 ×  10⁻¹¹ cubic centimeter (cm³)

Now, for the mass

\(Mass = Density \times Volume\)

Density of a red blood cell = 1 g/cm³

Volume of a red blood cell = 7.85 ×  10⁻¹¹ cubic centimeter (cm³)

Then,

Mass = 1 g/cm³ ×  7.85 ×  10⁻¹¹ cm³

Mass = 7.85 ×  10⁻¹¹ g

Hence, the mass in grams of a red blood cell is about 7.85 ×  10⁻¹¹ grams

Vehicles need to be serviced for several reasons such as preventing costly repairs and improving fuel economy.

First, regular maintenance can help to prevent costly repairs down the road. Second, maintenance can help to improve fuel economy and emissions. Third, maintenance can help to keep your vehicle safe and reliable.

The servicing requirements for petrol/diesel and electric vehicles differ in a number of ways. Petrol/diesel vehicles require oil changes more frequently than electric vehicles. This is because petrol/diesel engines use oil to lubricate the moving parts, while electric motors do not. Petrol/diesel vehicles also require tune-ups more frequently than electric vehicles.

This is because petrol/diesel engines have more moving parts that need to be synchronized, while electric motors have fewer moving parts.

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Answer:

The options that increase greenhouse gases are:

Coal burning power plant

Exhaust from a car

Wind power and solar power do not increase greenhouse gases, as they are considered renewable energy sources that do not produce direct emissions of greenhouse gases during their operation.

Explanation:

Answer:

Explanation:

Coal burning power plants and exhaust from a car increase greenhouse gases

Wind power and solar power do not produce greenhouse gases

I hope this helps!

Grace Scholars Program is a scholarship program that selects the best and brightest students for the program.

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