20 POINTS.
URGENT HELP AND PLEASE EXPLAIN.

Student A states that when she sits down on a chair, she is exerting a force on the chair and that is all that happens. Student B states that when she sits on a chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair Which student is correct and why?

Answer:

-10N to the left.

Explanation:

   The net force on a body is the single force that represent all the forces acting on a body.

 Let the right direction be positive

  Let the left direction be negative

Force acting to the right  = 5N

Force acting to the left  = -15N

Net force  = 5N + (-15N) = -10N

The net force will be directed -10N to the left.

Answer:

agear lever or agear stick is the lever that you use to change gear in acar or other vehicle

Answer:

80cm per second

Explanation:

Answer:

Explanation:

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

workdone = force × distance

From the question we have

workdone = 75 × 1.2

We have the final answer as

Hope this helps you

Answer:

[tex]\boxed {\boxed {\sf 90 \ Joules}}[/tex]

Explanation:

Work can be found by multiplying the force by the distance.

[tex]W=f*d[/tex]

The force of the package is 75 newtons.

The distance the package is lifted off the ground is 1.2 meters.

[tex]f= 75 \ N \\d=1.2 \ m[/tex]

Substitute the values in and multiply.

[tex]W= 75 \ N *1.2 \ m[/tex]

[tex]W=90 \ N*m[/tex]

1 Newton meter (N*m) is equal to 1 Joule (J).

Therefore, our answer of 90 Newton meters is equal to 90 Joules.

[tex]W= 90 \ J[/tex]

The work done is 90 Joules.

Answer: 1 = Heat

2=gas

3=it gets hot enough to boil because the metal conducts the heat into the water to heat it up and eventually boil.

Explanation: its common sense

Answer:

changing the polarity or direction of the battery changes the sign of the voltage and the current

Explanation:

The sign of current and voltage are due to established conventions.

The way that a DC circuit with negative current values ​​is by changing the polarity of the power source or by inverting the battery, this creates that the electrons move in the opposite direction

Changing the battery also changes the direction of the power difference, since the potential from positive to negative, in most cases negative is assigned a potential of zero volts

In summary, changing the polarity or direction of the battery changes the sign of the voltage and the current

Answer:

Change in its velocity divided by the change in time

Explanation:

the equation for average acceleration (a) = (vf-vi)/t

a = (velocity final - velocity initial) / change in time

Answer:

Explanation:

Wave Period and Frequency In this video Paul Andersen explains how the period is the time between wave and the frequency is the number of ... Your browser does not currently recognize any of the video formats available. ... Show less Show more ... Waves: Light, Sound, and the nature of Reality.

Answer:

4D

Explanation:

We will use 2nd equation of motion in this question:

s = Vi t + (0.5)gt²

where,

s = distance covered

t = time taken

g = acceleration due to gravity

For t = 1 s:

s = D

Therefore,

D = (0 m/s)(1 s) + (0.5)g(1 s)²

D = 0.5g   -------------- equation (1)

For t = 2 s:

s = D

Therefore,

s = (0 m/s)(1 s) + (0.5)g(2 s)²

s = 0.5g(4)

using equation (1):

s = 4D

therefore, correct answer is:

4D

Answer:

It does not hit the students face because the speed of the balloon slows down as energy is lost through thermal.

Explanation:

Answer: Light energy

Explanation: Light energy is a form of radiant energy that is visible to the human eye.

Answer:

9.Refraction

13.refractive index is the ratio of velocity of light in a vacuum to it's velocity I. a specified medium.

12.dispersion

14.Orange with a wavelength of about 585-620

I have no idea of number 10

Answer:

b? to a?

Explanation:

It converts mechanical energy to electrical.

Therefore, Option A is the correct answer

Answer:

you need to divide 7500/286.2

Answer:

Explanation:

neautrons and protons

The time required for a 20 coulombs charge to flow through a point if the current is 2 amperes will be 10 seconds.

Electric current is defined as the ratio of the charge flow in a given time interval. It is denoted by I. It has the unit is ampere.

The given data in the problem is;

t is the time is required

q is the charge = 20 Coulombs

I is the current is= 2 amperes

The formulas for the elctric current are given as;

[tex]\rm I = \frac{q}{t} \\\\\ \rm t = \frac{q}{I} \\\\ \rm t = \frac{20}{2} \\\\ t=10 \ sec[/tex]

Hence the time required for a 20 coulombs charge to flow through a point if the current is 2 amperes will be 10 seconds.

To learn more about the electric current refer to the link;

https://brainly.com/question/2264542

The time required for a 20 coulombs charge to flow through a point if the current is 2 amperes will be 10 seconds.

Electric current is defined as the ratio of the charge flow in a given time interval. It is denoted by I. It has the unit is ampere.

The given data in the problem is;

t is the time is required

q is the charge = 20 Coulombs

I is the current is= 2 amperes

The formulas for the electric current are given as;

[tex]I=\dfrac{q}{t}[/tex]

[tex]t=\dfrac{q}{I}[/tex]

[tex]t=\dfrac{20}{2}[/tex]

[tex]t=10 sec[/tex]

Hence the time required for a 20 coulombs charge to flow through a point if the current is 2 amperes will be 10 seconds.

To learn more about the electric current refer to the link;

brainly.com/question/2264542

Explanation:

If there are more reactants than products, it is a synthesis reaction. If oxygen is a part of the reactant, it is a combustion reaction. If one ion replaces another, it is a single replacement reaction. If there are two compounds in a reactant where cations switch, it is a double replacement reaction.

Answer:

F = 39.2 N

Explanation:

Since, the object is in uniform motion. Therefore, the frictional force on object will be:

Frictional Force = μk N = μk mg

where,

μk = coefficient of kinetic friction = 0.2

m = mass of crate = 10 kg

g = 9.8 m/s²

Therefore,

Frictional Force = (0.2)(10 kg)(9.8 m/s²)

Frictional Force = 19.6 N

The horizontal component of force must be equal to this frictional force to continue the uniform motion:

F Sin 30° = 19.6 N

F = 19.6 N/Sin 30°

F = 39.2 N

Answer:

I think the answer is B. Can I have brainlest if I am right, please?

Explanation:

Answer:

it is B because period =1/ frequency and B has lower period

Answer:

B; a path through a town with uprooted trees

Explanation:

took the quiz and got it right on edge2020!

The effect of tornadoes on the environment is a path through a town with uprooted trees. This, option B is correct.

It is the typical weather event that contains strong winds and leaves a path of destruction up to 50 miles long. It is also defined as the violently rotating column of air that touches the ground and is usually attached to a thunderstorm.

It is developed from a severe thunderstorm in warm, moist, and unstable air and extended up to 300 miles. The thunderstorms also generate heavy damage and devastate the environment in seconds and cause more fatalities.

A swirling, funnel-shaped, whirling wind is called a tornado and it is accompanied by hurricanes and storms. Strong tornadoes last for twenty minutes and the winds are between 200 mph to 300mph. The United States and Canada are mostly tornado-affecting countries.

The effect of tornadoes is a path through a town with uprooted trees and hence, the ideal solution is option B.

To learn more about Tornadoes:

https://brainly.com/question/5191031

#SPJ5

when two or more waves meet, they interact with other. The intersection of waves with other waves is called wave interference. wave interference may occur when two waves that are traveling I opposite directions meet. the two waves pass through each other, and this affects their amplitude

Answer:

gb  tbbyeyb

Explanation:

Answer:

Fnet = 13.86N

Explanation:

Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.

Mathematically, net force is given by the formula;

[tex] Fnet = Fapp + Fg[/tex]

Where;

Given the following data;

Mass = 1.1kg

Acceleration = 2.8m/s²

To find the applied force;

[tex] Fapp = ma[/tex]

Substituting into the equation, we have;

[tex] Fapp = 1.1 * 2.8[/tex]

Fapp = 3.08N

To find the gravitational force;

We know that acceleration due to gravity, g = 9.8m/s²

[tex] Fg = mg[/tex]

Substituting into the equation;

[tex] Fg = 1.1 * 9.8[/tex]

Fg = 10.78N

To find the net force;

[tex] Fnet = Fapp + Fg[/tex]

Substituting into the equation, we have;

[tex] Fnet = 3.08 + 10.78[/tex]

Fnet = 13.86N

Therefore, the net force required is 13.86N

Answer:

a) The car travelled a distance of 15 centimeters.

b) The displacement of the car is -15 centimeters.

c) The new position of the car on the track is 65 centimeters.

Explanation:

a) From Mechanical Physics we know that the distance travelled is magnitude of the route covered by the vehicle. If this car travels in a straight line and at constant velocity, then we can calculate the distance traveled by the following expression:

[tex]\Delta s = v\cdot \Delta t[/tex] (Eq. 1)

Where:

[tex]v[/tex] - Speed of the car, measured in centimeters per second.

[tex]\Delta t[/tex] - Time, measured in seconds.

[tex]\Delta s[/tex] - Distance travelled by the car, measured in meters.

If we get that [tex]v = 5\,\frac{cm}{s}[/tex] and [tex]\Delta t = 3\,s[/tex], then the distance travelled by the car is:

[tex]\Delta s = \left(5\,\frac{cm}{s} \right)\cdot (3\,s)[/tex]

[tex]\Delta s = 15\,cm[/tex]

The car travelled a distance of 15 centimeters.

b) The displacement is the vectorial distance between final and initial position. Then, we find that initial and final positions of the car are, respectively:

Initial position:

[tex]s_{o} = 80\,cm[/tex]

Final position: ([tex]s_{o} = 80\,cm[/tex], [tex]\Delta s = 15\,cm[/tex])

[tex]s_{f} = s_{o} -\Delta s[/tex] (Eq. 1)

[tex]s_{f} = 80\,cm-15\,cm[/tex]

[tex]s_{f} = 65\,cm[/tex]

And the displacement of the car is: ([tex]s_{o} = 80\,cm[/tex], [tex]s_{f} = 65\,cm[/tex])

[tex]d = s_{f}-s_{o}[/tex] (Eq. 2)

[tex]d = 65\,cm-80\,cm[/tex]

[tex]d = -15\,cm[/tex]

The displacement of the car is -15 centimeters.

c) The position of the car is its location regarding a point of reference. From point b) we find that the new position of the car on the track is:

[tex]s_{f} = 65\,cm[/tex]

The new position of the car on the track is 65 centimeters.

Answer:

same i just love helping people out

god bless you have a blessed day

Explanation:

Answer:

I do too

Explanation:

I like to help others especially if it has been filled in by struggling in a certain concept of a subject.

Do u agree?

Given :

A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off.

To Find :

What force does the wall exert on the ball.

Solution :

We know, by third law of motion "every motion has equal and opposite reaction".

Ball exert a force of 10 N to the left against the wall.

So, by newton's third law of motion :

Wall will exert same force of 10 N in opposite direction i.e in right direction.

Therefore, force does the wall exert on the ball is 10 N to the right.

Hence, this is the required solution.

Answer:

10 N to the right

Explanation:

edge 2021

Answer:

V₀y = 0 m/s

t = 2.47 s

V₀ₓ = 61.86 m/s

Vₓ = 61.86 m/s

Explanation:

Since, the ball is hit horizontally, there is no vertical component of velocity at initial point. So, the initial vertical velocity (V₀y) will beL

V₀y = 0 m/s

For the initial vertical velocity of golf ball we consider the vertical motion and apply 2nd equation of motion:

Y = V₀y*t + (0.5)gt²

where,

Y = Height = 30 m

g = 9.8 m/s²

t = time to hit the ground = ?

Therefore,

30 m = (0 m/s)(t) + (0.5)(9.8 m/s²)t²

t² = 30 m/4.9 m/s²

t = √6.122 s²

t = 2.47 s

For initial vertical velocity we analyze the horizontal motion of the ball. We neglect the frictional effects in horizontal motion thus the speed remains uniform. Hence,

V₀ₓ = Xt

where,

V₀ₓ = Initial vertical Velocity = ?

X = Horizontal Distance = 25 m

Therefore,

V₀ₓ = (25 m)(2.47 s)

V₀ₓ = 61.86 m/s

Due, to uniform motion in horizontal direction:

Final Vertical Velocity = Vₓ = V₀ₓ

Vₓ = 61.86 m/s

Answer:

The time taken for the paint ball to hit the ground is [tex]t = 2.143 \ s[/tex]

The distance of the landing point from the tower is [tex]d = 192.86 \ m[/tex]

Explanation:

From the question we are told that

   The height of the tower is [tex]h = 45 \ m[/tex]

    The speed of the paintball in the horizontal direction is  [tex]v_x = 90 \ m/s[/tex]

Generally from kinematic equation we have that

      [tex]h = ut + \frac{1}{2} at^2[/tex]

Here u is the initial  velocity of the paintball in the vertical direction and the value is 0 m/s , this because the ball was fired horizontally

         a is equivalent to [tex]g = 9.8\ m/s^2[/tex]

        t is the time taken for the paintball to hit the ground

   So    

       [tex]45 = 0* t + \frac{1}{2} 9.8 * t^2[/tex]

=>    [tex]t = 2.143 \ s[/tex]

Generally the distance of its landing position from the tower is

         [tex]d = v * t[/tex]

=>      [tex]d = 90 * 2.143[/tex]

=>    [tex]d = 192.86 \ m[/tex]