Any one please give me the correct answer of this question???
I hope you can help me...

Answer:

i think its 20m for b

Explanation:

Answer:

μk = 0.106

Explanation:

When the box is moving across the flat surface with a constant velocity, the force applied on it must be equal to the kinetic frictional force applied on the object:

F = μk*W = μk*mg

Where,

F = Force applied on box = 52 N

m = mass of box = 50 kg

g = 9.8 m/s²

μk = coefficient of kinetic friction between box and floor = ?

Therefore,

52 N  = μk(50 kg)(9.8 m/s²)

μk = (52 N)/(490 N)

μk = 0.106

The coefficient of kinetic friction between the box and the floor will be 0.106.

A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion

The size of the force will be determined by the kinetic friction coefficient between the two materials.

The given data in the problem is;

μ is the coefficient of kinetic friction=?

m is the mass = 50 kg

g is the acceleration due to gravity= 9.81 m/s²

v is the speed =3.5 m/sec

Force(F)= 52 Newton

The formula for kinetic friction force is;

[tex]\rm F= \mu_k R \\\\ R=mg \\\\ F= \mu_k mg \\\\\ 52 = \mu_k \times 50 \times 9.81 \\\\ \mu_k = 0.106[/tex]

Hence,the coefficient of kinetic friction between the box and the floor will be 0.106.

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Answer:

direction

size

Explanation:

Vectors are physical quantities with both magnitude or size and direction.

Scalars are physical quantities with only size but not direction.

When describing a vector, on must specify its magnitude and direction.

Only the size of scalar quantities are needed to describe them.

Answer:

Explanation:

14

Answer:

D

Explanation:

I took the test

The procedure that would best demonstrate that moving magnet causes an electric current to flow in a wire coil is connect a wire coil to an ammeter. Move a bar magnet into and out of the wire coil as you observe the ammeter. The correct option is D.

The flow of electricity in an electronic circuit, as well as the amount of electricity flowing through a circuit, are referred to as electric current. It is expressed in amperes (A).

The greater the value in amperes, the more electricity flows through the circuit.

When an electron is introduced into a wire, a free electron is attracted to a proton in order to be neutral.

Forcing electrons out of their orbits can result in an electron shortage. Electric current is the continuous movement of electrons in a wire.

Connecting a wire coil to an ammeter is the best way to demonstrate that a moving magnet causes an electric current to flow in a wire coil. As you watch the ammeter, move a bar magnet in and out of the wire coil.

Thus, the correct option is D.

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Answer:

(D) 2, 3, and 4

Explanation:

Given that the connection is parallel,

The parallel circuit consisting of a battery, a switch, wires, and 5 bulbs has been shown in the figure.

But none of the bulbs light up upon completing the connection.

The given possible reasons are:

As the connection is parallel, so the current from the battery is divided to all 5 bulbs, is one bulb is burnt out, it will not stop the current flowing through the other bulbs, so this is not the possible reason.

If one or more wire is not connected to the battery, then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.

If the switch isn't properly closed, then the circuit is not closed. Then there will be no current in the circuit, so, no bulb will glow. Hence this may be the possible reason.

If the resistance of the bulb is very large and the current flowing in it is too less, then there will not be sufficient to glow the bulb. so, no bulb will glow. Hence this may be the possible reason.

So, the possible may be options (2), (3), and (4).

Hence, option (D) is correct.

Answer:

Conduction, Convection and Radiation

Explanation:

Hope this helps!

Answer:

A. Both A and R are true and R is the correct explanation of A

Answer:

B. silicate rocks and metals

Terrestrial planets, such as Earth, are primarily composed of silicate rocks and metals. The correct answer is b. silicate rocks and metals.

Silicate rocks, which are made up of silicon and oxygen, are the dominant building blocks of these planets. They include minerals like quartz, feldspar, and mica. Terrestrial planets contain significant amounts of metals such as iron, nickel, and other heavy elements. These metals are found in the planet's core, providing structural strength and contributing to the planet's magnetic field.

This composition differentiates terrestrial planets from gas giants like Jupiter and Saturn, which are predominantly composed of hydrogen and helium. The combination of silicate rocks and metals forms the solid, rocky surfaces that characterize terrestrial planets.

Therefore, The correct answer is b. silicate rocks and metals.

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Answer:

1) the correct answer is B ,  2)  θ= 45º,

3) the projectile A must have a greater angle ,

4A)   vₓ (B)> vₓ (A) ,  

5B)  The maximum height is reached by the projectile with the highest speed, from the front this is projectile B

7) if the vertical velocity of both projectiles is the same time is the same

therefore the two projectiles have equal flight times

Explanation:

In this long exercise you are asked to answer a series of questions about the launching of projectiles

1) Path type

since they indicate that the air resistance is negligible the horizontal displacement is

       x = v₀ₓ t

On the vertical axis, a relationship acts, which is gravity, therefore its displacement is

      y = [tex]v_{oy}[/tex] t - ½ g t²

let's substitute to eliminate time

     y = v_{oy} (x / v₀ₓ) - ½ g (x / v₀ₓ)²

    y = (tan θ) x - (g / v₀ₓ²) x²

we can see that this is the equation of a parabola

therefore the correct answer is B

2) From the missile launch expressions the range is

           R = x = v₀² sin² 2θ / g

for the range to be maximum sin 2θ = 1, this occurs for

          2θ = 90

         θ= 45º

the correct answer is "The projectile fired at an angle close to 45º lands farther"

In response D implies that the projectile has been divided into two parts, in this case it is true that the lighter part must go further.

3) From the expression of scope we can see that as the angle increases the square sine becomes smaller, for example without 180 = 0

therefore to reach the nearest ship A must launch with a greater angle, therefore the projectile A must have a greater angle

Respect the questions are a bit strange.

* If the projectiles are fired at the same angle and in the statement they indicate that the velocities are equal, the two must reach the same height 4

4A. If the vertical speed is equal, the projectile that must reach the furthest ship (B) must have more horizontal speed

          vₓ (B)> vₓ (A)

5B. Both are launched with the same horizontal speed.

which is higher

            [tex]v_{y}[/tex]² =   v_{oy}² - 2 g y

at maximum height vertical velocity is zero (v_{y} = 0)

            0 = v_{oy}² - 2 g y

            y = v_{oy}² / 2g

the maximum height is reached by the projectile with the highest speed, from the front this is projectile B

7) they both reach the same height

As the value of the acceleration due to gravity is constant, the time to go up is the same time to go down, therefore if the two projectiles reach the maximum height, the time used is

             [tex]v_{y}[/tex] = v_{oy} - g t

              0 = v_{oy} - gt

              t = v_{oy} / g

if the vertical velocity of both projectiles is the same time is the same

therefore the two projectiles have equal flight times

Answer:

4

Explanation:

Divide 30 meters by 7.5 and you´re answer is 4. This is how I would think you solve the problem

Question

Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 8000 m/s Transverse waves, called S waves, travel at a slower 4500 m/s. A seismograph records the two waves from a distant earthquake. The S wave arrives 2.0 min after the PP wave.How far away is the Earthquake.  Assume that the waves travel in straight lines, although actual seismic waves follow more complex routes.

Answer:

The distance is  [tex]d = 1.23 *10^{6} \ m[/tex]

Explanation:

From the question we are told that

   The speed of longitudinal seismic  wave is  [tex]v_p = 8000 \ m/s[/tex]

    The speed of Transverse seismic  wave is  [tex]v_s = 4500 \ m/s[/tex]

     The time difference between the arrival of longitudinal seismic with respect to Transverse waves is  [tex]\Delta t = 2.0\ min = 120\ seconds[/tex]

Generally the  time difference between the arrival of longitudinal seismic with respect to Transverse waves is mathematically represented as

     [tex]\Delta t = t_p - t_s[/tex]

=>  [tex]\Delta t =\frac{d}{v_p} -\frac{d}{v_s}[/tex]

=>   [tex]d = \frac{\Delta t}{ \frac{1}{v_p} - \frac{1}{v_s} }[/tex]

=>   [tex]d = \frac{120 }{ \frac{1}{8000} - \frac{1}{4500} }[/tex]

=>   [tex]d = 1.23 *10^{6} \ m[/tex]

Answer:

is it 20kg. Two opposing forces pushing onto each other

Answer:

a) 0.1

b) density = mass/volume

                 = 0.5 /0.1

                 = 5 kg/[tex]m^{3}[/tex]

Answer:

h = 250 m

Explanation:

Given that,

The helicopter exerts 6480  N of force on the water while rising high enough to fly over a mountain.

The helicopter does [tex]1.62\times 10^6\ J[/tex] of work on the water lifting it.

We need to find how high does it lift the water. Work done is given by :

[tex]W=Fh\\\\h=\dfrac{W}{F}\\\\h=\dfrac{1.62\times 10^6}{6480}\\\\h=250\ m[/tex]

So, it can lift the water to a height of 250 m.

Answer:

Explanation:

Let the tension in horizontal rope be T₁ and in the other rope be T₂ which is making angle of 51.3⁰

The vertical component of tension T₂ will balance the weight .

= T₂ cos 51.3 = 2.9 x 9.8

T₂ = 2.9 x 9.8  / cos 51.3

= 28.42 / .625

= 45.47 N

The horizontal component of T₂ will balance T₁

T₂ sin 51.3 = T₁

45.47 sin 51.3 = T₁

T₁ = 35.48 N .

Answer:24

Explanation:

First you need to calculate the acceleration, for this use can use the following formula Force (F) = Mass (M) x Acceleration (A). If we extract A out of this, you can get the following equation A = F/M = 4/0.5 = 8 m/s^2. So, the object accelerates each second by 8 m/s, if the object does this for 3 second, the velocity would be 8 x 3 = 24

Answer:

Because you have no force, the acceleration is zero and the body moves at a constant speed

Answer:

social cognitive theory

Explanation:

Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.

Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.

Cognitive processes refer to the mental processes involved in perception, attention, memory, reasoning, problem-solving, and decision-making. They involve the use of knowledge, experience, and understanding to process information and make sense of the world around us.

Here, examples of cognitive processes include perception, attention, memory, language processing, and executive functions such as planning and decision-making. Cognitive processes are essential for learning, problem-solving, and adaptive behavior, and they are an important focus of study in psychology and cognitive science.

Albert Bandura's theory, originally called social learning theory, is now referred to as social cognitive theory, and it suggests cognitive processes play a role in influencing one's personality.

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Answer:

The horizontal component of the 70 N force = 35·√3 N

The vertical component of the 70 N force = 35 N

Explanation:

The magnitude of the given force, F = 70 N

The angle of inclination of the given force to the horizontal, θ = 30°

By the resolution of forces, we can resolve the given force, F, into its horizontal component, Fₓ, and vertical components, [tex]F_y[/tex], as follows;

The horizontal component of the given force = Fₓ = F × cos(θ)

Substituting the values, we have;

The horizontal component of the 70 N force, Fₓ = 70 × cos(30°) = 35·√3 N

The vertical component of the given force = [tex]F_y[/tex] = F × sin(θ)

Substituting the values, we have;

The vertical component of the 70 N force, [tex]F_y[/tex] = 70 × sin(30°) = 35 N.

the first one is c

second is b

third is c

forth is b

Answer:

1. i think its therml...it could be sound too

2. 16m

3.45

4.5.0

Answer:

c > √(2ab)

Explanation:

In this exercise we are asked to find the condition for c in such a way that the results have been real

The given equation is

              ½ a t² - c t + b = 0

we can see that this is a quadratic equation whose solution is

             t = [c ±√(c² - 4 (½ a) b)]  / 2

for the results to be real, the square root must be real, so the radicand must be greater than zero

              c² -2a b > 0

              c > √(2ab)

Answer:

Explanation: Correct on Edg 2020/2021 for my school.

Small gaps which function as expansion joints are deliberately left between the rail ends to allow for expansion of the rails in hot weather. ... Because of these small gaps, when trains pass over jointed tracks they make a "clickety-clack" sound.

Answer:

Ro = 133 [kg/m³]

Explanation:

In order to solve this problem, we must apply the definition of density, which is defined as the relationship between mass and volume.

[tex]Ro = m/V[/tex]

where:

m = mass [kg]

V = volume [m³]

We will convert the units of length to meters and the mass to kilograms.

L = 15 [cm] = 0.15 [m]

t = 2 [mm] = 0.002 [m]

w = 10 [cm] = 0.1 [m]

Now we can find the volume.

[tex]V = 0.15*0.002*0.1\\V = 0.00003 [m^{3} ][/tex]

And the mass m = 4 [gramm] = 0.004 [kg]

[tex]Ro = 0.004/0.00003\\Ro = 133 [kg/m^{3}][/tex]

Answer: 2 blocks east if i'm not mistaken.