If there is air friction, which falls faster?
Why?

Answer:

1.2 W

Explanation:

Let the value of resistance be R , emf of battery be E

current i = E / R

power = i² R

= E² x R / R²

= E² / R

Given

E² / R = .30

when two batteries are connected

Total emf = 2E

current = 2E / R

Power = ( 2E / R )² x R

= 4 E² / R

= 4 x .30

= 1.2 W .

Explanation:

Average velocity indicates direction and can be represented as a negative number when the displacement is in the negative direction. Average speed does not indicate direction and can only be positive or zero.

Answer: Light energy

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

Answer:

We have to think safe when performing ballroom dances or any other form of dance due to dance moves being a physical activity which is usually prone to some form of accidents.

This is because it involves the movement of various parts of the body which has joints and such joints could easily be sprained when the wrong steps are taken which is usually why caution should be taken.

Owing the swift movements involved in a ballroom dance, we must think safe when performing a ballroom dance.

Dance involves the movement of parts of the body. Usually, these body movements are swift and vigorous. As a result of the vigor involved in moving the body during a dance, it is necessary to exercise caution.

Therefore, it is important to think safe during a ballroom dance to avoid a sprain or fracture or any other kind of injury.

Learn more: https://brainly.com/question/20906233

Answer:

15N

Explanation:

Answer:

15N

Explanation:

F=(45-30) N=15N

.........

Answer:

A) v₁ = 5.66 [m/s]

Explanation:

To solve this problem we must use the definition of linear momentum conservation, which tells us that momentum is conservation before and after a collision.

The linear momentum is equal to the mass by the product of the Velocity.

P = m*v

where:

P = lineal momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Now, to the right side of the equal sign will take the linear momentum before the collision and to the left side of the equal sign as after the collision.

Pbefore = Pafter

(m₁*v₁) - (m₂*v₂) = (m₁*v₃) + (m₂*v₄)

where:

m₁ = mass of the car = 1450 [kg]

v₁ = velocity of the car before the collision [m/s]

m₂ = mass of the shopping cart = 60 [kg]

v₂ = velocity of the shopping cart before the collision = -1.2 [m/s]

v₃ = velocity of the car after the collision = 5.13 [m/s]

v₄ = velocity of the shopping cart after the collision = 11.75 [m/s]

Now replacing:

(1450*v₁) - (60*1.2) = (1450*5.13) + (60*11.75)

1450*v₁ - 72 = 7438.5 + 705

1450*v₁  = 7438.5 + 705 + 72

1450*v₁ = 8215.5

v₁ = 5.66 [m/s]

Answer:

5.67 m/s

Just did it.

Explanation:

The calcified bones of our skeleton work with circulatory system. Marrow inside our bones helps to produce cell inside blood. Both red blood cell and white blood cell are produced in bones. Circulatory system delivers oxygenated blood into bones.

A.) Steel.

steel travels 5,060 meters per second,

lead travels 1,402 meters per second,

water travels 1,439 meters per second,

and air depends on temperature.

Answer:

the amount of force that keeps two surfaces touching, but does not let them come apart or press further together

Explanation:

Hope this helps - Good luck ^w

Normal force is the support force exerted upon an object that is in contact with another stable object.

Answer:

Force of kinetic friction, Fk = 6N

Explanation:

Given the following data;

Coefficient of kinetic friction, μ = 0.2

Normal force, Fn=30N

To find the Force of kinetic friction;

Mathematically, the force of kinetic friction is given by the formula;

Fk = μFn

Where;

Substituting into the equation, we have;

Fk = 0.2*30

Fk = 6N

Therefore, the force of kinetic friction is 6N.

A force that is present between two moving objects or surfaces is called kinetic friction. It is estimated in newtons (N) and is calculated by:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

Where, [tex]\rm F_{k}[/tex] = frictional force,  [tex]\mu _{\rm k}[/tex]  = coefficient, [tex]\rm F_{n}[/tex] = normal force.

The kinetic friction of the object is 6N.

The kinetic friction can be estimated as:

Given,

Substituting values in the formula:

[tex]\rm F_{k} =\rm \mu _{\rm k} F_{n}[/tex]

[tex]\begin{aligned}\rm F_{k} &= 0.2 \times 30\\\\\rm F_{k} &= 6 \rm N\end{aligned}[/tex]

Therefore, 6N is the frictional force.

To learn more about frictional force follow the link:

https://brainly.com/question/1714663

Answer:

A. A 41 kg object that is moving east at 5 m/s

Explanation:

I'm taking this test and got it right.

Answer:

B

Explanation:

You need a specific force to change the momentum of something.

Hope this helps!

Answer:

C.) the mass of mars is less than the mass of earth.

Explanation:

The more mass of the planet, the stronger the gravitational pull is. The rover will seem lighter on mars because there is less gravity pulling it onto the planet.

The mass of mars is less than the mass of earth.

The more mass of the planet, the stronger the gravitational pull is. The rover will seem lighter on mars because there is less gravity pulling it onto the planet.

Earth, the third planet from the Sun, is the planet where all known life is found. Although the Solar System contains enormous amounts of water, only Earth is home to liquid surface water.

The ocean covers roughly 70.8% of Earth's surface, dwarfing the polar ice, lakes, and rivers. Earth's surface is made up of continents and islands for the remaining 29.2% of its total area.

Therefore, The mass of mars is less than the mass of earth.

To learn more about Earth, refer to the link:

https://brainly.com/question/12041467

#SPJ2

Answer:

Weight of the pile of boxes as I think

Answer:

It doesn't change. It stays the same.

I hopes this helped you and if it did I'm glad I helped someone!!!

Explanation:

Answer: 2 m/s is the answer

Explanation:

Answer:

almost 100% positive its B but dont take me up on it

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 730 × 20

We have the final answer as

Hope this helps you

Answer:

this was 2 weeks ago, but im pretty sure the correct answers are:

B=c

C=d

D=b

hope this helps and is correct :)

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) body composition, (2) flexibility, (3) muscular strength, (4) muscular endurance, and (5) cardiorespiratory endurance. 

Question is not complete, so i have attached it.

Answer:

A) W = 1.962 N

B) F_f = 0.706 N

C) F_net = 3.294 N

Explanation:

A) The block is 0.2 kg.

Formula for weight is;

W = mg

W = 0.2 × 9.81

W = 1.962 N

B) Magnitude of the force acting on the moving block is given by;

F_f = μmg

Where μ is coefficient of kinetic friction

Coefficient of kinetic friction for copper(mild steel) from online sources is 0.36

Thus;

F_f = 0.36 × 1.962

F_f = 0.706 N

C) Magnitude of net force is;

F_net = F_applied - F_f

F_net = 4 - 0.706

F_net = 3.294 N

1. The weight of the copper block is equal to 1.96 Newton.

2. The magnitude of the force acting on the moving copper block is 0.7056 Newton.

3. The magnitude of the net force acting on the moving copper block is 3.2944 Newton.

Given the following data:

We know that the acceleration due to gravity (g) of an object on planet Earth is equal to 9.8 [tex]m/s^2[/tex].

We know that the coefficient of kinetic friction for copper is equal to 0.36.

1. To determine the weight of the copper block:

[tex]Weight = mg\\\\Weight = 0.200 \times 9.8[/tex]

Weight = 1.96 Newton

2. To determine the magnitude of the force acting on the moving copper block:

Mathematically, the force of kinetic friction is given by the formula;

[tex]F_k = umg[/tex]

Where;

Substituting the parameters into the formula, we have;

[tex]F_k = 0.36 \times 0.200 \times 9.8\\\\F_k = 0.7056 \;Newton[/tex]

3. To determine the magnitude of the net force acting on the moving copper block:

[tex]F_{net} = F - F_k\\\\F_{net} = 4-0.7056\\\\F_{net} = 3.2944\;Newton[/tex]

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Explanation:

by finding the distance between two successful crest

Answer:

the wavelength can be measured as the distance from crest to crest  or from trough to trough , the wavelength of a wave can be measured as the distance from a point on a wave to the corresponding point on the next cycle of the wave.

Explanation:

Throughout your life, your skin will change constantly, for better or worse. In fact, your skin will regenerate itself approximately every 27 days. Proper skin care is essential to maintaining the health and vitality of this protective organ.

Answer:

Explanation:

Different Parts of an Electric Motor and Their Function

A simple motor has the following parts:

A power supply – mostly DC for a simple motor

Field Magnet – could be a permanent magnet or an electromagnet

An Armature or rotor

Commutator

Brushes

Axle

Power Source: A simple motor usually has a DC power source.  It supplies power to the motor armature or field coils.

Commutator: It is the rotating interface of the armature coil with a stationary circuit.

Field Magnet: The magnetic field helps to produce a torque on the rotating armature coil by virtue of Fleming’s left-hand rule.

Armature Core: Holds the armature coil in place and provides mechanical support.

Armature Coil: It helps the motor to run.

Brushes: It is a device that conducts current between stationary wires and moving parts, most commonly the rotating shaft.

What Is The Working Principle of An Electric Motor?

The working of an electric motor is based on the fact that a current carrying conductor produces a magnetic field around it. To better understand, imagine the following situation.

Take two bar magnets and keep the poles facing each other with a small space in between. Now, take a small length of a conducting wire and make a loop. Keep this loop in between the space between the magnets such that it is still within the sphere of influence of the magnets. Now for the last bit. Connect the ends of the loop to battery terminals.

Once electricity flows through your simple circuit, you will notice that your loop “moves”. So why does this happen? The magnetic field of the magnets interferes with that produced due to electric current flowing in the conductor. Since the loop has become a magnet, one side of it will be attracted to the north pole of the magnet and the other to the south pole. This causes the loop to continuously rotate. This is the principle of working of electric motor.

Answer:

280 N

Explanation:

acceleration = v2-v1 / time taken = (2-4 )/ 0.05 = -40 m/s^2  ( neg sign indicates slowing down )

force exerted = ma = 7 kg x -40 m/s^2 = - 280 N ( neg sign means opposite direction of initial velocity )

since the 7 kg ball is slowing down, the  direction of force will be opposite of the initial velocity , and it will be 280 N

Answer:

Is always negative answer for you