What is the coefficient of kinetic friction if a car going at 20 m/s stops in 50 m?

Answer:

R2 = 300 Ohms

Explanation:

Let the two resistors be R1 and R2 respectively.

RT is the total equivalent resistance.

Given the following data;

R1 = 100 Ohms

RT = 75 Ohms

To find R2;

Mathematically, the total equivalent resistance of resistors connected in parallel is given by the formula;

\( RT = \frac {R1*R2}{R1 + R2} \)

Substituting into the formula, we have;

\( 75 = \frac {100*R2}{100 + R2} \)

Cross-multiplying, we have;

75 * (100 + R2) = 100R2

7500 + 75R2 = 100R2

7500 = 100R2 - 75R2

7500 = 25R2

R2 = 7500/25

R2 = 300 Ohms

The resolution of a speedometer is defined as the smallest increment that the instrument can display. It is calculated by dividing the full scale reading (FSC) by the number of divisions on the scale.

The higher the number of divisions, the higher the resolution.

For example, if the speedometer has a full scale reading of 100 mph and the scale has 500 divisions, the resolution would be 100/500 = 0.2 mph.

This means the speedometer can display increments of 0.2 mph.

To improve the resolution, the number of divisions can be increased. It is important to note that the resolution of a speedometer should match the accuracy of the instrument to ensure accurate readings.

To learn more about speedometer visit :

https://brainly.com/question/29098798#

#SPJ11

Answer:

3.85 V

Explanation:

The potential difference between two points can be calculated using the following equation

Where E is the energy and Q is the charge. So, replacing E = 250 J and Q = 65 C, we get:

Therefore, the potential difference is 3.85 V

The relationship between mass and kinetic energy is K.E ∝ m and K.E ∝ v².

The kinetic energy of an object exists as the energy that it maintains due to its motion. It is defined as the work required to accelerate a body of a disseminated mass from rest to its stated velocity. Having acquired this energy during its acceleration, the body preserves this kinetic energy unless its speed changes.

To know more about kinetic energy, refer:

https://brainly.com/question/25959744

#SPJ9

As the number of protons in an atom’s nucleus increases, the number of electrons must increase to maintain the atom’s overall neutral charge; option B.

Atomic number is the number of protons present in the nucleus of an atom.

The atomic number of atoms of elements increase with increase in atomic number.

In conclusion, atomic number increases the size down a group and decreases atomic size across a period.

Learn more about atomic number at: https://brainly.com/question/621740

#SPJ1

Kinetic energy: 1/2 * m * v^2

Where:

h0=337m

hA = 17 m

hB = 157 m

hC = 317 m

Initial energy = final energy

PE0 + KE0 = PE2 + KE2

KE0 = velocity = 0

KE= 1/2 mv^2 = 0

PE0 = initial potential energy = mgh

m=mass

h=height

g= gravity= 10 m/s^2

For point A.

Instead oh h0=337 and hA=17m we can state that

H0=337-17 = 320

HA= 0 (so PEA=0 )

PE0 = KEA

mgh0 =1/2 m va^2

gh0 = 1/2 va^2

10 * 320 = 1/2 va^2

√(10 * 320)*2 = va

va = 80 m/s

Same process for point B

mgh0 = 1/2 m vb

g h0 = 1/2 vb

10 * 180 = 1/2 vb^2

√(10 * 180)*2 = vb

vb= 60 m/s

Point C:

H0=337-317=20

vc= √(10 * 20)*2

vc= 20 m/S

√

Answer:

it can be stored using

I hope it helps

Answer:

HEAT?

Explanation:

A person gets a suntan on a beach is not an example of convection. Therefore, the correct option is option C.

The process of convection involves the movement of such a heated fluid, including such air or water, in order to transfer heat. Natural convection is caused by the fact that most fluids have a propensity to expand when heated, becoming less dense and rising due to the increased buoyancy.

Natural convection is caused by the fact that most fluids have a tendency to expand when heated, becoming less dense and rising due to the increased buoyancy. The air inside a heated room or the water inside a kettle are heated uniformly thanks to circulation brought on by this effect. A person gets a suntan on a beach is not an example of convection.

Therefore, the correct option is option C.

To know more about convection, here:

https://brainly.com/question/16635311

#SPJ3

Your question is incomplete but most probably your full question was,  

Which one of the following is not an example of convection?

a) Smoke rises above a fire.

b) An eagle soars on an updraft of wind.

c) A person gets a suntan on a beach.

d) Spaghetti is cooked in water.

e) An electric heater warms a room.  

Answer:

.

Explanation:

,.....................................

The change in enthalpy is  0 J/kg if the incompressible substance with a density of 1000 kg/m3 is isothermally compressed from 100 to 1000 kpa. Thus, option b is correct.

The given data is as follows:

The density of substance = 1000 kg/m3

In-compression pressure = 100 to 1000 kph

The given substance is incompressible. So its specific volume stays constant during the process. The work done is Zero.

Assuming that the process is Isothermal, the temperature remains steady.

The change in enthalpy is calculated by using the formula:

ΔH = m × C × ΔT

The density of mass is calculated by using the formula,

m = V × ρ = 1 m3 × 1000 kg/m3

m = 1000 kg

Change in enthalpy is calculated as:

ΔH = m × C × ΔT

ΔH = 1000 kg × 0 J/(kg·K) × 0 K

ΔH = 0 J/kg

Therefore we can conclude that the change in enthalpy is  0 J/kg.

To learn more about enthalpy

https://brainly.com/question/24170335

#SPJ4

The complete question is-

an incompressible substance with a density of 1000 kg/m3 is isothermally compressed from 100 to 1000 kph. determine the change in enthalpy. multiple choice questions.

a.900 kj/kg

b. 0 kj/kg

c.10 kj/kg

d.0.9 kj/kg

Answer:

?? what

Explanation:

The quantities that would be measured in your experiment will be:

Quantity to be Measured Symbol Equipment to Measure

Mass of Cart                    m Electronic Balance

Initial Velocity of Cart    v_i Motion Detector

Final Velocity of Cart     v_f Motion Detector

Time of Collision           Δt Photogates/Timer

Impulse Applied by Bumper J Force Sensor/Photogates and Mass

The overall procedure to be followed to collect data that could be used to find the relationship between impulse and change in velocity.

The impulse applied to the cart by the bumper can be determined using the formula:

J = Δp = m(vf - vi)

where m is the mass of the cart, vf is the final velocity of the cart, and vi is the initial velocity of the cart.

The change in velocity of the cart can be determined using the formula:

Δv = vf - vi

where vf is the final velocity of the cart and vi is the initial velocity of the cart.

Learn more about impulse on:

https://brainly.com/question/229647

#SPJ1

Because they last for a very long time, they become unstable and then either slip back into to the sun and erupt into space.

Solar flares are abrupt outbursts that are among the most violent phenomena to occur on the Sun's surface.Flares can unleash energies equal than millions of thermonuclear weapons and normally endure for a few minutes.

The moment the filament size starts to diminish as seen in H pictures is when we designate the filaments eruption start time.This study reports 33 eruptive filament episodes, of which 73% are connected with CMEs and 76% with solar flares.

To know more about solar storm visit:

https://brainly.com/question/24427668

#SPJ4

If a logarithmic scale is used on a graph, it can be assumed that the data extend over a wide range of values. This is because a logarithmic scale is used to compress data that varies greatly in magnitude onto a single graph. The correct option is d.

In other words, a logarithmic scale allows for a better visualization and comparison of data that varies greatly in size.

Logarithmic scales are commonly used in various fields such as economics, physics, and medicine. For example, in economics, a logarithmic scale can be used to display income inequality, where the data may range from very low income to very high income. In physics, a logarithmic scale can be used to show the frequency range of sound or electromagnetic waves, where the data may vary greatly in magnitude. In medicine, a logarithmic scale can be used to display drug dosages, where the data may range from very small to very large doses.

In summary, if a logarithmic scale is used on a graph, it indicates that the data extend over a wide range of values, which may be difficult to display on a linear scale. Thus, the correct option is d.

To know more about logarithmic scale, refer to the link below:

https://brainly.com/question/30188635#

#SPJ11

Answer:

dang

Explanation:

Braking studies have shown that a tractor-trailer traveling at 55 mph needs two times the distance to stop as an automobile.

There are four parts that make up a vehicle's overall stopping distance i.e., Vehicle reaction time and distance, human perception time and distance, human reaction time and distance Vehicle Braking Distance and Time

The maximum distance your car will travel while braking under perfect circumstances. It may require 216 feet at 55 mph on dry pavement with decent brakes. The brakes must use more force to stop a bigger car, which increases heat absorption. On the other hand, large vehicles' brakes, tires, springs, and shock absorbers are made to function optimally when fully loaded. Trucks that are empty need longer stopping distances because they have less traction. It can lock up and bounce, providing substantially worse braking.

To learn more about braking system, click at:

https://brainly.com/question/28498761

#SPJ4

Answer:

Explanation:

The Wavelength of light is D=2.06m.

A slit with a width of 0 point 630 mm diffracts a monochromatic light beam. 1 point 26 meters away from the slit, a wall develops a diffraction pattern. The central maximum measures 2 point 05 millimeters in width.

To find the wavelength of the light consider following points-

d=0.450mm=0.450×10⁻³m.

D=2.06m.

Reasoning -

To know more about single slit diffraction-

https://brainly.com/question/26384235

#SPJ4

Velocity and acceleration are vector quantities whereas speed, temperature and age are not.

Vector is a quantity that has both magnitude and direction and is represented by an arrow whose direction is same as that of the quantity and length is proportional to the quantity's magnitude.

Vector has magnitude and direction but it does not have position. Velocity and acceleration both are vector quantities as they have magnitude and direction.

If the speed of an object remains same but direction changes then the object is accelerating. It is important to remember that acceleration and velocity aren't always in the same direction.

To know more about vector quantity, refer

https://brainly.com/question/626479

#SPJ1

Answer:

Explanation:

Given:

F = 300 N

p = 20 N/m²

__________

A - ?

Valid for the area A:

A = F / p

A = 300 / 20 = 15 m²

Answer: it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.

Explanation:

Skepticism is simply the understanding that there can be uncertainty when it comes to knowledge in certain areas.

From the question, we are informed that John doesn't think that skepticism should play an important role in the scientific process and that he says that skepticism interferes with scientific consensus.

The statement that best describes John's conclusion is that it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.

The soil loss in  \(Mg ha^{-1}\) (Ton/ha) if the bulk density of the soil is 1.01  \(Mg m^{-3}\)  is option a. 0.202 Mg/ha.

For expressing the soil loss in \(Mg ha^{-1}\), need to convert the units appropriately. First, convert the soil loss from millimetres (mm) to meters (m) by dividing it by 1,000 (1 mm = 0.001 m). Thus, the soil loss is 0.0002 m.

Next, calculate the volume of soil lost per unit area (ha). The volume can be obtained by multiplying the soil loss (0.0002 m) by the area (ha). Since the bulk density of the soil is given as 1.01 \(Mg m^{-3}\), can convert the volume to mass by multiplying it by the bulk density.

Using the formula:

Soil loss (Mg ha-1) = Soil loss (m) × Bulk density (\(Mg m^{-3}\)) × Area (ha)

Substituting the values:

Soil loss (\(Mg ha-1\)) = 0.0002 m × 1.01 \(Mg m^{-3}\) × 1 ha

Calculating the result:

Soil loss (\(Mg ha-1\)) = 0.0002 × 1.01 = 0.000202 \(Mg ha-1\)

Therefore, the correct answer is option a. 0.202 Mg/ha.

Learn more about density here:

https://brainly.com/question/952755

#SPJ11

Answer:

Ans : C

Explanation:

C. The force of gravity acting on the chair

Answer:

D. the force from the chair on the student

Explanation:

Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.

This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself. 

Hope this helps :)

Thousands of small rocky objects known as asteroids can be found in the solar system between Mars and Jupiter.

The Solar System is composed of the Sun and the objects that orbit it. It was created by the gravitational collapse of a massive interstellar molecular cloud 4.6 billion years ago. The Sun contains the vast majority of the system's mass, with Jupiter holding the majority of the remaining mass.

Asteroids are rocky bodies that orbit the Sun. Although asteroids orbit the Sun in the same way that planets do, they are much smaller. In our solar system, there are numerous asteroids. The majority of them are found in the main asteroid belt, which lies between the orbits of Mars and Jupiter.

To know more about solar system, visit:

https://brainly.com/question/12075871

#SPJ4

Magnetism and electricity are intimately connected. An electric current is created by moving magnets and a magnetic field is created by moving electrons. These two powerful forces interact to create electromagnetism.

The particle motion known as an electric current begins when such an outside voltage is applied to one of the conductor's ends. The electrons with a negative charge that are drawn to the positive electrode of the externally applied electric as a result create an electric field around them.

When describing how much energy flows through a circuit as well as how it travels in an electrical circuits, the phrase "electric current" is often employed. It is measured in amperes (A).

To know more about electric current visit:

https://brainly.com/question/17178352

#SPJ1

A driver should phone 911 to report an emergency vehicle if they see one coming.

Responders to "code 3" emergencies frequently pass stopped or slow-moving traffic or backed-up cars at stoplights by using opposing lanes. Allow the ambulance to pass: When you see an ambulance with its sirens on, move to the right and yield. Ensure there is sufficient room for the car to pass. In times of panic, you might make a mistaken turn. Reduce your speed, then come to a complete stop, to avoid that. If it's safe and practical, a driver should change lanes if they notice an emergency vehicle on the side of the road with its lights flashing and/or sirens on.

To learn more about speed click here https://brainly.com/question/28224010

#SPJ4

Answer:

Travels through solid materials, and air.... but it can also travel through the vacuum of space

Explanation:

Answer:

Explanation:

roles of nutrient in our body​