a box of mass 4kg slides on the horizontal surface with kinetic frictional force of 8N. what coefficient of friction between the box and horizontal surface​

Answer:

Maximum pressure = 4450 N/m²

Explanation:

We'll begin by calculating the volume of the block. This can be obtained as follow:

Volume (V) = 5 cm × 3 cm × 2 cm

V = 30 cm³

Next, we shall determine the mass of the block. This can be obtained as follow:

Density = 8.9 g/cm³

Volume = 30 cm³

Mass =?

Density = mass /volume

8.9 = mass / 30

Cross multiply

Mass = 8.9 × 30

Mass = 267 g

Next, we shall covert 267 g to Kg.

1000 g = 1 Kg

Therefore,

267 g = 267 g × 1 Kg / 1000

267 g = 0.267 Kg

Thus, the mass of the block is 0.267 Kg

Next, we shall determine the force.

Force of gravity (g) = 10 N/Kg

Mass (m) = 0.267 Kg

Force (F) =?

F = mg

F = 0.267 × 20

F = 2.67 N

Next, we shall determine the minimum area since we are trying to obtain the maximum pressure. This can be obtained as follow:

Minimum area = 3 cm × 2 cm

Covert each measurement to metre (m) by dividing each measurement by 100

Minimum area = 0.03 m × 0.02 m

Minimum area = 0.0006 m²

Finally, we shall determine the maximum pressure. This can be obtained as follow:

Force (F) = 2.67 N

Minimum area = 0.0006 m²

Maximum pressure =?

Maximum pressure = Force /minimum area

Maximum pressure = 2.67 / 0.0006

Maximum pressure = 4450 N/m²

Answer:

b, i think

Explanation:

Answer:

1240j I think this is the answer

Answer:

your pretty no matter what others say

Explanation:

Answer:

two bros chillin in a hot tub five feet apart cuz there not gay

Explanation:

do you remember this vine

Answer:

It will apply the greatest pressure of an area of 1.

Explanation:

To find pressure use the formula P = F/A

P = 100/1

P = 100

Answer:

10 N / cm^2

Explanation:

The Formiula is P = F / A

P = presure

F = Force in Newtons

A = area.

The answer is the smaller the area the larger the pressure.

The smallest area you have given us is 10 cm^2

The Pressure = 100N / 10 cm^2

Pressure = 10 N/cm^2  

Note: the units are not exactly standard units, but I've given the answer the way the question offers the units.

Answer:

Search it up in the internet UwU

Explanation:

Answer:

mass = 27750 kg

Explanation:

acceleration: (change in velocity)÷(time)

acceleration = (final velocity - initial velocity) ÷ time taken

Given that:

Final velocity is 250 km/h and initial is 0 km/h and time is 2.05s

acceleration = [(250 - 0) ÷ 0.0005694444]

acceleration = 439024.4 km/h²

conversion to m/s² :

acceleration = 439024.4 m/s²

--------------------------------------------------------------------

Force = mass(kg) * acceleration(m/s²)

we know that force is  9.40×10^5 N

9.40×10^5 = mass(kg) *   33.875 (m/s²)

mass =  9.40×10^5 ÷  33.875

mass = 27750 kg

The force on an electron passing through a 0.75 T magnetic field if the velocity of the electron is 4.0 x 10⁶m/s is -3.6 x 10⁻¹² N.

From the information above, magnetic field B = 0.75 T

Velocity of the electron v = 4.0 x 10⁶ m/s

Now, we know that the force on an electron due to the magnetic field is given by

F = qvB

where, q is the charge on the electron

The charge on an electron is -1.6 x 10⁻¹⁹Coulombs

Putting these values, we get

F = (-1.6 x 10⁻¹⁹C) x (4.0 x 10⁶ m/s) x (0.75 T)

F = -3.6 x 10⁻¹² N

The negative sign in the answer indicates that the force is acting in the opposite direction to the direction of motion of the electron.

Learn more about electron at:

https://brainly.com/question/31386902

#SPJ11

Answer:

f=ma......10N=0.2a....=50m/s

Answer:

here,

force = mass× acceleration

10 = 0.2 kg × a

or, 10/0.2=a

or, a = 50km/h^2

is the required ans .

a) The characteristic polynomial is \(D^2 + 5D + 6,\)the characteristic equation is\(D^2 + 5D + 6 = 0\), and the characteristic roots are -2 and -3.

b) The zero-input response ya(t) for t > 0 is given by ya(t) = \(c1e^(-2t) + c2e^(-3t),\) where c1 and c2 are constants determined by the initial conditions ya(0-) = 2 and the characteristic modes corresponding to each characteristic root.

The given LTIC system is:

\((D^2 + 5D + 6)y(t) - (D + 1)x(t)\)

a) To find the characteristic polynomial, we set y(t) = 0 and substitute \(e^(st)\) for x(t), where s is a complex number:

\(s^2 + 5s + 6 - (s + 1) = 0\)

\(s^2 + 4s + 5 = 0\)

This gives us the characteristic polynomial:

\(p(s) = s^2 + 4s + 5\)

The characteristic equation is obtained by setting p(s) = 0:

\(s^2 + 4s + 5 = 0\)

The characteristic roots are the solutions to this equation, which can be found using the quadratic formula:

\(s = (-4 ± sqrt(4^2 - 415)) / 2\)

\(s = (-4 ± j)\)

where j = sqrt(5). Therefore, the characteristic roots are -2 + j and -2 - j.

b) To find the zero-input response ya(t) for t > 0 with initial condition ya(0-) = 2, we need to express the input x(t) in terms of the characteristic modes corresponding to each characteristic root. The characteristic modes are given by\(e^(st),\) where s is a characteristic root.

For the first characteristic root, s = -2 + j, the characteristic mode is \(e^((-2+j)t)\). Similarly, for the second characteristic root, s = -2 - j, the characteristic mode is \(e^((-2-j)t).\)

We can express the initial condition ya(0-) in terms of the characteristic modes as follows:

ya(0-) = \(c1 e^((-2+j)*0) + c2 e^((-2-j)*0) = c1 + c2 = 2\)

To solve for c1 and c2, we differentiate the characteristic modes and substitute them into the LTIC equation:

\((D^2 + 5D + 6)y(t) = 0\)

Taking the Laplace transform of both sides, we get:

\((s^2 + 5s + 6) Y(s) = 0\)

Solving for Y(s), we get:

\(Y(s) = c1/s + c2/(s+3)\)

Using partial fraction decomposition and inverse Laplace transform, we can express Y(s) as a sum of terms, each corresponding to a characteristic mode:

\(Y(s) = (2-j)/(s+3) - (2+j)/s\)

Taking the inverse Laplace transform of Y(s), we get:

\(y(t) = (2-j)e^(-3t) - (2+j)\)

Therefore, the zero-input response ya(t) is:

\(ya(t) = c1 e^((-2+j)t) + c2 e^((-2-j)t)\)

Substituting the initial condition, we get:

c1 + c2 = 2

To solve for c1 and c2, we differentiate ya(t) and substitute it into the LTIC equation:

\((D^2 + 5D + 6)y(t) = 0\)

Taking the Laplace transform of both sides, we get:

\((s^2 + 5s + 6) Y(s) - s ya(0-) - D ya(0-) = 0\)

Substituting the characteristic modes and initial condition, we get:

\((c1(s^2 + 5s + 6) + (j-2)s + j-2)e^((-2+j)t) + (c2(s^2 + 5s + 6) + (-j-2)s - j-2)e^\)

Learn more about polynomial

https://brainly.com/question/11566541

#SPJ4

Inside the bar magnet, the magnetic field points from north to south. Statement A is correct.

Magnetic Field:

It is defined as a vector field or the influence of the magnet on the electric current, charges and ferromagnetic substance.

The strength of magnetic field is depends up on the numbers of magnetic field lines per unit area.

Therefore, inside the bar magnet, the magnetic field points from north to south.

To know more about Magnetic Field:

https://brainly.com/question/19542022

Answer:b

Explanation:

Answer:

-1.24 m/s

Explanation:

Total momentum before collision = total momentum after collision

Total momentum before collision = (mass of full back * velocity of fullback) + (mass of lineman * velocity of line man).

Mass of full back = 112 kg, mass of line bag = 120 kg, velocity of full back  6 m/s (east), velocity of line back = -8 m/s (west). Hence:

Total momentum before collision = (112 * 6) + (120 * -8) = 672 - 960 = -288 kgm/s

The total momentum after collision = (mass of full back + mass of line back) * velocity after collision.

Let velocity after collision be v, hence:

The total momentum after collision = (112 + 120)v = 232v

Total momentum before collision = total momentum after collision

-288 = 232v

v = -288 / 232

v = -1.24 m/s

Therefore after collision, the two players would move at a velocity 1.24 m/s west (the same direction as the lineman).

True. Neutron stars are some of the densest objects that we can directly observe in the universe. These stars are formed when a massive star undergoes a supernova explosion, and the core of the star collapses under its own gravity, creating a super-dense object that is composed almost entirely of neutrons.

The Neutron stars have a mass similar to that of the sun but are only about 10 miles in diameter, making them incredibly compact. Because of their extreme density, neutron stars have very strong gravitational fields and can cause the space around them to warp and bend. They also emit intense radiation, including X-rays and gamma rays, which can be detected by telescopes. Studying neutron stars can provide insights into the fundamental properties of matter, as well as the processes that occur in the most extreme environments in the universe.

learn more about Neutron here.

https://brainly.com/question/14870325

#SPJ11

Answer:

Reflected

Explanation:

During the process of reflection whatever that is sent forth e.g light comes back (reflects)

Answer:

transmitted

Explanation:

took quiz

Answer:

W = 1418.9 J = 1.418 KJ

Explanation:

In order to find the work done by the pull force applied by Karla, we need to can use the formula of work done. This formula tells us that work done on a body is the product of the distance covered by the object with the component of force applied in the direction of that displacement:

W = F.d

W = Fd Cosθ

where,

W = Work Done = ?

F = Force = 151 N

d = distance covered = 10 m

θ = Angle with horizontal = 20°

Therefore,

W = (151 N)(10 m) Cos 20°

W = 1418.9 J = 1.418 KJ

This soccer technology fair challenge serves to acquaint college students with simple records of how the quantity of air in a football ball can have an effect on the distance it travels while kicked with the regular force.

Velocity / (vɪˈlɒsɪtɪ) / noun plural ties the pace of movement, motion, or operation rapidity; swiftness. physics is a degree of the charge of the movement of a frame expressed as the price of alternate of its role in a specific route with time.

Now that the variety of projectile is given by R = u 2 sin ⁡ 2 θ g, while could be most for a given preliminary speed velocity is the directional velocity of an item in movement as a demonstration of its fee of change in position as observed from a particular body of reference and as measured by using a specific trendy of time.

Learn more about velocity here

https://brainly.com/question/25749514

#SPJ4

Answer:

they do not function appropriately in the tissue or organ they are a part of.

The statement that is true about cancer cells is They do not function appropriately in the tissue or organ they are a part of. Option C is the correct answer.

Cancer cells differ from normal cells in several ways. One of the key characteristics of cancer cells is that they lose their normal function and behavior within the tissue or organ they originate from. Option C is the correct answer.

Normal cells have specific roles and functions within the body, contributing to the overall health and proper functioning of the tissue or organ they are a part of. In contrast, cancer cells undergo a series of genetic mutations that disrupt their normal function. These mutations can lead to uncontrolled cell growth and division, which is a hallmark of cancer. As a result, cancer cells no longer perform the specialized functions of the tissue or organ they are derived from, and they can interfere with the normal functioning of nearby healthy cells.

Learn more about Cancer here:

https://brainly.com/question/26059802

#SPJ2

The complete question is, "What is TRUE about cancer cells?

a. They are just like normal cells except for the way they function.

b. They form an encapsulated tumor that keeps them in one area of the body

c. They do not function appropriately in the tissue or organ they are a part of.

d. The mutations in cancer cells are caused by environmental factors."

To find the natural frequencies and mode shapes of the system shown in the figure for m1=m2=1kg, we need to use the equations of motion and solve for the eigenvalues and eigenvectors.

First, let's label the displacements of the two masses as x1 and x2. Using Newton's second law, we can write down the equations of motion: m1x1'' = -kx1 + k(x2-x1) + F1, m2x2'' = -k(x2-x1) + F2, where k is the spring constant, F1 and F2 are the external forces acting on the masses, and the double primes denote second derivatives with respect to time.

The natural frequencies are the frequencies at which the system will oscillate without any external forces acting on it. The mode shapes are the patterns of motion of the system at the natural frequencies. For example, one mode shape could be where both masses oscillate in phase with each other, while another mode shape could be where the masses oscillate out of phase with each other. The mode shapes depend on the initial conditions and the specific values of the parameters of the system.
To know more about motion visit:

https://brainly.com/question/12640444

#SPJ11

We would need 200 turns of wire to produce the same magnetic field strength of 0.10 T.

The magnetic field strength at the north pole of a 2.0-cm-diameter, 8-cm-long Alnico magnet is 0.10 T. To produce the same field with a solenoid of the same size, carrying a current of 1.5 A, you would need 200 turns of wire.

What is the expression for the magnetic field strength of a solenoid?

The expression for the magnetic field strength of a solenoid is given by:

\(�=�0���B= Lμ 0​ NI\)

​

where B is the magnetic field strength, μ0 is the permeability of free space, N is the number of turns of wire, I is the current passing through the wire, and L is the length of the solenoid.

Hence, we can find N as follows:

\(�=���0�N= μ 0​ IBL​\)

Given that B = 0.10 T, L = 8 cm = 0.08 m, and I = 1.5 A.

Substituting these values in the above expression, we get:

\(�=0.10×0.084�×10−7×1.5=199.39≈200N= 4π×10 −7 ×1.50.10×0.08​ =199.39≈200\)

Therefore, you would need 200 turns of wire to produce the same magnetic field strength of 0.10 T with a solenoid of the same size, carrying a current of 1.5 A.

To learn more about wire, refer below:

https://brainly.com/question/16452786

#SPJ11

Time elapsed is = 680/ 343 = 1.98. Calculating the time it takes for the sound to travel from the source to the cliff and back again can help us establish how long it was before we heard an echo.

The answer is 0.1 seconds, exactly. When a sound is reflected, it causes an echo that delays the direct sound's arrival reaching the listener. The time difference between the original sound and the reflected sound must be at least 0.1 seconds for there to be a clear echo.

As a result, seconds must pass between hearing the original sound and the echo for the sound to be audible. The distance formula [d = V] might be used.

To know more about echo  visit:-

brainly.com/question/3114582

#SPJ1

Answer:

0.4m/s² to the left

Explanation:

To solve this problem, we must know that;

     Net force  = mass x acceleration

Net force is the resultant force on a body that will act like a single force;

    Force to left  - force to right  = mass x acceleration

                7  - 5  = 5 x acceleration

                  2  = 5 x acceleration

        Acceleration  = \(\frac{2}{5}\)   = 0.4m/s² to the left

The equivalent resistance of the circuit is 0.67 ohms. The current through the circuit is 7.46 amps.

1/Req = 1/R1 + 1/R2 + 1/R3 + ...

In this case, we have three resistors connected in parallel, so:

1/Req = 1/R1 + 1/R2 + 1/R3

1/Req = 1/2.00 + 1/2.00 + 1/2.00

1/Req = 1.5

Req = 0.67 ohms

the equivalent resistance of the circuit is 0.67 ohms.

I = V/R

In this case, the voltage is 5V and the resistance is 0.67 ohms, so:

I = 5/0.67

I = 7.46 amps

Resistance is the measure of an object's ability to impede the flow of electric current through it. It is measured in ohms (Ω). Resistance is determined by the physical properties of an object, such as its dimensions, material, and temperature. When electric current flows through a conductor, it encounters resistance that slows down its flow. This resistance is caused by the collisions between electrons and the atoms in the conductor. The greater the number of collisions, the higher the resistance.

Resistance can be affected by changes in the physical properties of the conductor, such as length, cross-sectional area, or temperature. A longer or narrower conductor will have higher resistance, while a wider conductor will have lower resistance. The resistance of most materials increases with temperature. Understanding resistance is important for designing and operating electrical circuits. By controlling the resistance of a circuit, engineers can ensure that the correct amount of current flows to power the devices connected to it.

To know more about Resistance visit here:

brainly.com/question/30799966

#SPJ4

The charge would be in equilibrium so there would be no charge in the body of the conductor.

Answer:

(b) there cannot be any charge in the body of the conductor

Answer:

B

Explanation:

Note the line that there is no charges anywhere else outside means the charge is placed in equilibrium position.

Hence there cannot be any charge in the body of conductor

Answer:

It would crash into the thing it's orbiting.

Explanation:

Since it's not going fast enough to counter the pull of gravity.