Which of the following diagrams best represents the gravitational force W. the frictional force f, and the normal force N that act on the block?

Answer:

The velocity of the freight cars after collision is 0.7 m/s

Explanation:

Given;

mass of the first freight car, m₁ = 18000 kg

initial speed of the first freight car, u₁ = 1.75 m/s

mass of the second freight car, m₂ = 27000 kg

initial speed of the second freight car, u₂ = 0

Let the velocity of the freight cars after collision = v

Apply the principle of conservation of linear momentum;

m₁u₁ + m₂u₂ = v(m₁ + m₂)

18000(1.75) + 27000(0) = v(18000 + 27000)

31500 = 45000v

v = 31500 / 45000

v = 0.7 m/s

Therefore, the velocity of the freight cars after collision is 0.7 m/s

Answer: A; Precipitate

Explanation:

Răspuns:

1000 kg

Explicaţie:

Date date

t1 = 10 ° C

t2 = 293,15K = până la grad = 293,15-273 = 20,15 ° C

= 20 ° C    aproximativ

Q = 418kJ = 418000J

c = 4180J / kg ° C

m =? Kg

Necesar:

Masa m în kg

Pasul doi:

Formulă:

Q = c * m * Δt

Q = c * m * (t2 -t1)

m = Q / c * (t2-t1)

Calculati:

m = 418000/4180 * (20-10)

m = 100 * 10 kg

m = 1000 kg

In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C

Thermal energy sometimes referred to as heat energy, may be described as the type of energy in which heat is transmitted from one body to another body as a result of their molecular motions.

As given in the problem Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.

As stated, all three boxes were put on the window for the same amount of time—an hour—so since the time duration for the experiment was the same, it may be considered an independent variable.

Thus, In this experiment, the time of an hour is an independent variable, therefore the correct answer is option C.

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Answer:

The kinetic energy of the molecules would increase.

Explanation:

Answer:

C. The kinetic energy of the molecules would increase.

Explanation:

On Edge 2021

Explanation:

hope this will help u

Answer:

I'll take this one also

Answer:

La aceleración del automovil antes de deternerse es -5.5 m/s².

Explanation:

Podemos encontar la aceleración del auto usando la siguiente ecuación:

[tex] v_{f} = v_{0} + at [/tex]

En donde:

[tex]v_{f}[/tex]: es la velocidad final = 0 (se detiene)

[tex]v_{f}[/tex]: es la velocidad inicial

a: es la aceleración=?

t: es el tiempo = 4.0 s

Primero debemos encontrar la velocidad inicial, para ellos usaremos la siguiente ecuación de moviemiento rectilíneo uniforme:

[tex] v_{0} = \frac{x}{t} = \frac{110 m}{5.0 s} = 22 m/s [/tex]

Ahora, la aceleración es:

[tex] a = \frac{v_{f} - v_{0}}{t} = \frac{0 - 22 m/s}{4.0 s} = -5.5 m/s^{2} [/tex]

El signo negativo se debe a que el auto está desacelerando.

Entonces, la aceleración del automovil antes de deternerse es -5.5 m/s².

Espero que te sea de utilidad!                          

Answer:

0.1m

Explanation:

Given parameters:

Frequency  = 12hz

Speed  = 1.2m/s

Unknown:

Wavelength of the wave  = ?

Solution:

The wavelength of the wave can be derived using the expression below;

      V  = f∧

V is the speed of the wave

f is the frequency of the wave

∧ is the wavelength

 So;

         ∧  = [tex]\frac{Velocity}{frequency}[/tex]

Now, insert the parameters and solve;

       ∧   = [tex]\frac{1.2}{12}[/tex]   = 0.1m

Answer:

195 is it current pls tell

Answer:

F' = (4/9)F

Explanation:

The electrostatic force between two charged objects is given by Coulomb's Law:

F = kq₁q₂/r²   -------------------- equation (1)

where,

F = Electrostatic Force

k = Coulomb's Constant

q₁ = magnitude of first charge

q₂ = magnitude of second charge

r = distance between charges

Now, when the charges and distance altered as follows:

q₁' = 2q₁

q₂' = 2q₂

r' = 3r

Then,

F' = kq₁'q₂'/r'²

F' = k(2q₁)(2q₂)/(3r)²

F' = (4/9)kq₁q₂/r²

using equation (1):

F' = (4/9)F

Answer:

the canon would be blasted .4/6 miles bc it s half of 9.8 which shows its signifigant expretion on the decimal point weather its a posative or negative

Explanation:

Hopefully this helped, if not HMU and I will try my best to get u a better answer!

Have a great day! :)

And if ur failing and u need help I can help u, no points needed :)

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value  is [tex]F_f = 3 * -4[/tex]

Explanation:

From the question we are told that  

  The mass of the block is  [tex]m = 3 \ kg[/tex]

  The initial speed of the block before entering the rough section is [tex]u = 5 \ m/s[/tex]

  The time taken is  t = 0.5 s

   The  speed with which the block leaves the rough section is  [tex]v = 3 \ m/s[/tex]

Generally from kinematic equation

      [tex]v = u + at[/tex]

=>   [tex]a = \frac{v - u }{t}[/tex]

=>   [tex]a = \frac{3 - 5 }{0.5}[/tex]

=>   [tex]a = - 4[/tex]

Generally the magnitude of the average frictional  force is mathematically represented as

      [tex]F_f = m * a[/tex]

=>  [tex]F_f = 3 * -4[/tex]

=>    [tex]F_f = -12 \ N[/tex]

The negative sign show that the force is acting in the opposite direction to the direction of motion of the block

The frictional force between the block and the horizontal surface is 12.1 N.

The given parameters;

The acceleration of the block is calculated as follows;

[tex]a = \frac{\Delta v}{t} \\\\a = \frac{5- 3}{0.5} \\\\a = 4 \ m/s^2[/tex]

The coefficient of friction between the block and the horizontal surface is calculated as;

[tex]\mu_k = \frac{a}{g} \\\\\mu_k = \frac{4}{9.8} \\\\\mu_k = 0.41[/tex]

The frictional force between the block and the horizontal surface is calculated as follows;

[tex]F_f = \mu_k F_n\\\\F_f = \mu_k mg\\\\F_f = 0.41 \times 3 \times 9.8\\\\F_f = 12 .1 \ N[/tex]

Thus, the frictional force between the block and the horizontal surface is 12.1 N.

"Your question is not complete, it seems to be missing the following information;"

A block of mass 3 kg slides along a horizontal surface that has negligible friction except for one section, as shown above. The block arrives at the rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed of 3 m/s. What is the magnitude of the average frictional force exerted on the block by the rough section of the surface?

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Answer:

There are 2 types of forces, contact forces and act at a distance force. Forces. Every day you are using forces. Force is basically push and pull. When you push and pull you are applying a force to an object.The Four Fundamental Forces of Nature

Gravity.

The weak force.

Electromagnetism.

The strong force.

5m I think,maybe, not a 100% sure die

Answer:

5m i think

Explanation:

WHATS THE ANSWER HELP!!

hope it helps!

Answer:

The magnitude of the hiker’s resultant displacement is 5.6 km

The direction of the hiker’s resultant displacement is 77 degrees south west! Hope this helps!!!

Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. The Bernoulli's Principle explains the behavior of an ideal fluid passing through a pipe or enclosed passageway such a pump.

Answer:

The escalator does more work and the elevator has a greater power output.

Explanation:

The escalator does more work on the person because it is carrying them up. It also gives the person a chance to walk up the escalator making it a little more challenging than using just an elevator. The elevator has a greater power output because it can transport a person from one floor to another in just 10 seconds where as the escalator can do it in 15.

Hope this helps!

Answer:

a large matters of body with no shape is mass

Answer:

Heat energy

Explanation:

The seemingly lost energy due to the work done by friction is lost to heat energy.

When we account for heat energy of the system, it is clearly seen that it is not lost as we perceive it.

Answer:

I believe it is either Metals or Nonmetals

Explanation:

Hope this helped, Have a Wonderful Day/Night!!

Answer:

C. Potential energy is related to an object's position, and kinetic

Explanation:

The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.

Answer:

c. potential energy is related to an object's position, and kinetic energy is related to its motion

Explanation:

Answer:

A) refused to vote and left the convention.

Explanation:

At the first Democratic Party convention of 1860, fifty Southern delegates refused to vote and left the convention

Answer:

The answer is A

Explanation:

got it right edge 2021

Answer:

Explanation:

(a) Electromagnetic waves travels at the speed of light = 3.0 x [tex]10^{8}[/tex] m/s.

v = fλ

where v is the velocity of the wave, f is the frequency, and λ wavelength.

So that;

λ = [tex]\frac{v}{f}[/tex]

  = [tex]\frac{3.0*10^{8} }{87.9*10^{6} }[/tex]

  = 3.413 m

ii. Enegy of the wave can be determined by;

E = hf

where h is the Planck's constant and f the frequency of the wave.

E = 6.626 x [tex]10^{-34}[/tex] x 87.9 x [tex]10^{6}[/tex]

  = 5.82 x [tex]10^{-26}[/tex] J

(b) Refractive index of water = [tex]\frac{velocity of light in air}{velocity of light in water}[/tex]

velocity of light in water = 1.33 x 3.0 x [tex]10^{8}[/tex]

       = 3.99 x [tex]10^{8}[/tex] m/s

Explanation:

Here is the answer,

Lets be BF

The density of solid is 3.842 g/cm³.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume.

Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Displaced Weight = 277.5 - 212.5

                              = 65 gm

Density = 0.9 g/cm³

Mass = 65 gm

Volume = Mass / Density

             = 65 / 0.9

             = 72.22 cm³

Now,

Density of Solid = 277.5 / 72.22

                          = 3.842 g/cm³.

Hence , The density of solid is 3.842 g/cm³.

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Answer:

8

Explanation:

im gonna say 8 because the peak of the line would be at 8 not to sure 0-0

Answer:

C is the correct answer

Answer:

Conduction.

Convection.

Radiation.