to sharpen a knife, you push with a force of 5n so that the edge of the knife is against a stone. the stone will sharpen the knife if it is spinning. the 30cm diameter stone is spinning at 200rpm and has a mass of 30kg. the coefficient of kinetic friction between the knife and the stone is 0.30. after 10 seconds of grinding what is the angular speed of the stone?

Newton's Third Law states that " when a body A exerts a force on body B(action), then body B exerts a force of equal magnitude but opposite in direction on body A(reaction)". Because these 2 forces act on different bodies, they are not canceled out and movement of a body can take place.

Movement is possible despite the existence of Newton's third law of motion because the equal in magnitude opposite in direction forces mentioned in the question, do not act on the same body. The two forces (action and reaction) of equal magnitude and opposite direction act on different systems. Hence these forces do not cancel each other out and movement takes place.

For example, consider a swimmer who reaches the edge of a pool. He pushes the pool wall with his feet to move forward into the water, in a direction opposite to the direction in which his feet exert the push on the pool wall. The push exerted by the swimmer on the wall is the action. The pool wall in turn exerts a reaction force of equal magnitude on the swimmer( i.e. in a direction opposite to the direction of the action force).

We see how the action and reaction forces do not act on the same bodies and hence do not get canceled out. Thus movement takes place ( in this swimmer moves in a direction opposite to his push).

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Answer:

Approx 50 atm

Explanation:

See graph below:

Net ebony x-axis. ∅ ≈ 2° west of north.

= Rx = 5+ 7 cos 20° - 12

= -0.42 mi

Now, -axis  y axis

Ry = 7 Sin 20° +15 - 5

= 12.39 mi

= [tex]\sqrt{Rx^{2} + R}y^{2}[/tex] = [tex]\sqrt{(0.42)^{2} + (12.39)^{2} }[/tex]

IRI = 12.40 mi

Its direction:

tan ∅ = Rx/Ry west of North Ry  

∅ = [tex]tan^{-1}[/tex](0.42/12.39)

∅ = 1.94° west of north

∅ ≈ 2° west of north.

In the graphical method of adding vectors A and B, the vectors are drawn on the graph and added from head to tail. The resulting vector R is defined as A + B = R. The magnitude and direction of R are determined using a ruler and protractor, respectively. Draw the vectors so that their starting points coincide. Then draw a line to make a perfect parallelogram.

The diagonal from the starting point of the parallelogram to the opposite vertex is the result. GRI allows users to graphically display the detailed results of technical and economic analysis of a project. Hybrid2 uses two types of simulation models. One is for long-term performance prediction called the logistic model.

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A series RC circuit that receives its power from a DC source will experience transient phenomena when the circuit closes.

Therefore, it follows that the current flow is not constant over time. Beginning high and falling off exponentially, it eventually reaches zero. The current will be (V/R) x (1/e) at the moment when t=RC. The greatest current value is V/R.

1/e is roughly equal to 0.37.

Therefore, RC is the period of time in a series RC circuit during which the current will decrease to about 37% of its maximum value.

To obtain the necessary current vs. time characteristic, etc., the appropriate value of R and C is chosen based on the needs of the electronic circuit.

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Answer:

100 Ncm or 1 Nm

How to do:

Given:

Displacement (d): 20cm

Force (F): 5N

Want:

Work: ???

Equation:

W = Fd

Solve:

W = Fd

W = 5N x 20 cm

W = 100 Ncm

If you want it in meters (standard unit), just do unit conversions:

1 cm = 1 m/100 cm

20cm x 1 m/100 cm = 20/100 = 0.2m

W = 5N x 0.2m = 1 Nm

Answer:

112.5 cm

Explanation:

if mddddddbsmsjsixjxx

Answer:

112 cm^3

Explanation:

877.5 g   /    7.8 g/cm^3 =   112 cm^3

The current flow in the circuit is 0.77 A.

The current flow in the circuit is the rate at which electron flows in the circuit at a given period of time.

Apply the flowing Ohm's law to determine the current flow in the circuit.

I = V/(R + r)

where;

I = (1.54) / (1.9 + 0.1)

I = 0.77 A

Thus, the current flow in the circuit is determined by applying Ohm's law equation.

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Answer:

In physics, interference is a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude.

Explanation:

effects

chemistry

atom

effects -Constructive interference leads to an increase in the amplitude of the sum wave, while destructive interference can lead to the total cancellation of the contributing waves.

chemistry -An interference is a substance, other than the assayed material, that can be measured by the chosen analytical method or that can prevent the assayed material from being measured. Interferences cause erroneous analytical results

atom-When those two electrons come together and they are in phase with each other, constructive interference occurs. They won't overlap completely; these are atoms and they take up space. However, they will be able to sit pretty close to each other, sort of smushing their electrons together.

Answer:

When we turn on the television, electrical energy changes into light and sound.

Answer:B is the answer

Explanation: So the paint change color in liquid it means it dissolved in the water

Answer:

Choice d  
0 acceleration and velocity of 6 m/s

Explanation:

The smart way to tackle questions like these is by POE or Process of Elimination.

We can easily eliminate choices a, b and c since velocity is definitely not 0

So choice (d)

If we look at the graph we see that between 6s and 8s the graph is flat at a velocity value of 6 m/s. So the answer should be velocity of 6 m/s and since there is no increase in velocity, the acceleration is also 0

However, this can also be proved mathematically
Acceleration = change in velocity/change in time
                     =  Δv/Δt

Δv = 6 - 6 = 0
The velocity is 6 m/s at 8 seconds and also 6 m/s at 6 seconds
Δt = 8 - 6 =2

Acceleration = 0/2 = 0 m/s²

Hence choice d

The frictional force acting on the 17 kg mass is 111.62 N.

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.

This type of force resist the motion of two surfaces that are in contact.

Mathematically, the formula for frictional force is given as;

Ff = µsN

where;

The frictional force acting on the mass is calculated as follows;

Ff =  µsN

Ff =  µsmg

Ff = (0.67) x (17 kg) x (9.8 m/s²)

Ff = 111.62 N

Thus, the frictional force acting on the mass depends on the mass and acceleration due to gravity on the mass.

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The change in temperature of the resistance wire is 500 K.

We need to know about the resistance of conductive material to solve this problem. Resistance can be defined as the ratio of the voltage applied to the current flow It can be written as

R = V / I

where R is resistance, V is voltage and I is current.

From the question above, the given parameters are

I2 = 20% I1

ɑ = 0.0004

Find the final resistance in the same voltage

R2 / R1 = (V2 / I2 )/ (V1 / I1)

R2 / R1 = 0.2 I1 / I1

R2 = 0.2 R1

As we know that the temperature dependence of resistance is

R2 = R1 . ɑ . ΔT

0.2 R1 = R1 . 0.0004 . ΔT

ΔT = 500 K

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Because the planets formed from a disk of material that enveloped the Sun during the Solar System's formation, their orbits are coplanar.

Because the planets formed during the formation of the Solar System from a disk of dust that enveloped the Sun, their orbits are coplanar. The planets all formed in a plane because that disk of dust was a disk that was all in a plane.

Astronomy frequently deals with rings and disks. Any initial, minute rotation of the cloud is amplified by the conservation of angular momentum during cloud collapse.

It is the maximum balance between gravitational collapse and the centrifugal force produced by rapid spin as a cloud spins faster and faster before collapsing into a disk. Coplanar planets, the thin disks of spiral galaxies, and the accretion disks of black holes are the end results.

All of the planets are almost in the same plane with some degree of shift because of the spinning of the disc during the early stages of the solar system's formation, when a large disc of matter was revolving around the sun. Due to gravitational forces, the matter gravitated together and planets were formed.

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Answer:

400 Newtons or 40 kg

Explanation:

The gravitational force in Newtons of a body of mass mkg on the surface of the earth is given by the equation

[tex]F_e = G\dfrac{mM_e} {r_e^2}[/tex]

where [tex]F_e[/tex] is the magnitude of the gravitational force on earth

m the mass of the object and [tex]M_e[/tex] the mass of the earth and [tex]r_e[/tex] the radius of the earth

G is the universal gravitational constant which is the same throughout the universe

On Mars, the gravitational force for the same object would be:

[tex]F_m = G\dfrac{mM_m} {r_m^2}[/tex]

Since it is given that
[tex]M_m = \dfrac{1}{9}M_e[/tex]

and

[tex]r_m = \dfrac{1}{2}r_e[/tex]

we can rewrite [tex]F_m[/tex] in terms of [tex]F_e[/tex]

[tex]F_m = G\dfrac{m\dfrac{M_{e}}{9}}{\left(\dfrac{r_{e}}{2}\right)^{2}}[/tex]

[tex]\dfrac{4}{9} \;G\dfrac{mM_{e}}{\left(r_{e}\right)^{2}} =\dfrac{4}{9} F_e\\\\= \dfrac{4}{9} \cdot 900 = 400\;N[/tex]

Since F = mg where g = 10 m/s^2

m = F/g = 400N/10m/s² = 40 kg

 (+8, 0), (0, 3) are  the magnitude of the other force.

The first force is represented by the following equation: F(1) = (Fx(1), Fy(1)) = (+8, 0)

Similarly, the second foce has the following x- and y-values:

F(2) = (Fx(2), Fy(2)), where x and y are unknowable.

The object is subject to a net force of:

F(net) = (0, 3), Fx(net), and Fy(net)

A scalar is used to indicate a force's magnitude, which is the amount to which the body it is acting on will be accelerated by the force (a single number). The force's strength can also be considered in terms of its magnitude. When forces are shown as vectors, the force's magnitude is typically explicitly labelled. Additionally, the vector's length frequently reflects its relative magnitude, with longer vectors denoting larger magnitudes.

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The coefficient of the kinetic friction between the box and the concrete is 0.25. Kinetic friction is the term for the resistance that exists between two systems while they are in contact and moving in relation to one another.

We are constantly surrounded by a force called friction that prevents relative motion between systems in contact while still allowing us to move (which you have discovered if you have ever tried to walk on ice).

Even though friction is a common force, its behavior is actually quite complex and still not fully understood. For any understandings we can obtain, we must heavily rely on observations. We are nevertheless able to deal with its simpler general qualities and comprehend the situations in which it functions.

One of the more basic aspects of friction is that it always occurs in opposition to the motion or attempted motion of the systems with respect to each other and is parallel to the contact surface between the systems. Kinetic friction is the term for the resistance that exists between two systems while they are in contact and moving in relation to one another.

Friction, for instance, makes a hockey puck sliding on ice slower. However, static friction can exist between things while they are immobile; this friction is typically stronger than kinetic friction.

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If the car b travels a distance d before stopping, the car a travelled a distance of 4D.

The third equation of motion can be used to calculate the distance how far the cars drove before coming to a stop:

Vf2 - Vi2 = 2as

(Vf2 - Vi2)/2a = s

where,

s is the distance covered.

Final Speed = 0 m/s for Vf

Initial Speed = Vi

an is the deceleration rate.

We start by thinking about Car B and giving it a subscript 2:

Vf₂ = 0 m/s (As, automobile finally stops) (As, car finally stops)

s₂ = D

a₂ = - a (due to slowdown) (due to deceleration)

D = (0² - Vi₂²) /(-2a) (-2a)

the equation D = Vi22/2a (1)

We now take Car A into consideration and give it a subscript 1:

Vf₁ = 0 m/s (As, automobile finally stops) (As, car finally stops)

s₁ = ?

a₁ = - a (due to slowdown) (due to deceleration)

Vi₁ = 2 Vi₂ (Since, car A was previously moving at twice speed of car B) (Since, car A was initially traveling at twice speed of car B)

s₁ = (0² - Vi₁²) /(-2a) (-2a)

s₁ = (2Vi₂)²/2a

s₁ = 4 (Vi₂²/2a)

Using formula (1), we arrive at:

s₁ = 4D.

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The Mid-Atlantic Ridge spreads about 2-5 centimeters per year whereas the East Pacific Rise spreads about 6-16 centimeters every year.

According to the research, the East Pacific Rise is spreading faster than the Mid-Atlantic Ridge. The wide of red and orange parallel to the East Pacific Rise indicates that a large area of oceanic rocks is new and young. The Mid-Atlantic Ridge is a slow-spreading center. It spreads 2-5 centimeters every year and forms an ocean trench while on the other hand, the East Pacific Rise spreads faster because the East Pacific Rise spreads about 6-16 centimeters every year which is higher than the Mid-Atlantic Ridge.

So we can conclude that the East Pacific Rise is spreading faster as compared to the Mid-Atlantic Ridge.

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The hydrogen atom can use the Rydberg equation to determine the energy of light emitted or absorbed. When electrons are raised from a lower energy level to a higher energy level, light is absorbed. When electrons relax from a higher energy level back down to a lower energy level, light is released.

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The eventual fate of our sun is to become a steadily cooling white dwarf.

A star cannot continue its main sequence forever, because it is consuming an ever-dwindling amount of hydrogen. The main characteristic that determines the fate of a star is its mass. A star at least 10 times more massive than our sun can become a supernova. However, our sun is relatively small and is classified as a yellow dwarf.

Once its hydrogen reserve is expended it will expand, becoming a red giant, and then shrink again, becoming a white dwarf that will continue cooling for trillions of years.

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Gravitational Potential Energy

m: mass

g: gravity

h: height

m: kilogram

g: m/s^2

h: meters

The lorentz Transformation eq enables us to transform velocity from one frame of reference to another, in relative motion with respect to it.

Let S and S' be two inertial frames in relative motion so that S; moves with uniform velocity v to the right. alog the X axis Relative to S

Let u and u' be the velocities of a particle measurd in inertial frames S and S'

so u'=u-v/(1-uv/c^2)

as u=v=c so

u'=u-v

u'=0.500-0.400

u'=0.100c

The direction of the net velocity of the car is 15 m/s due west.

The change in velocity of an object is the rate at which the velocity of the object changes with time.

The change in the velocity of the car is calculated as follows;

Δv = vf - vi

where;

The given parameters;

Δv = 5 m/s - 20 m/s

Δv =  - 15 m/s

Thus, the direction of the net velocity of the car will be due west.

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The speed of the object base on its revolution is 40π km/min and the acceleration is zero.

The revolution number of the tire can be calculated by using the circular motion. The revolution number is represented by n. The number of revolutions in a circular motion should follow

n = s / (2πR)

where n is total revolution, s is total distance and R is the radius of circular object.

From the question above, the given parameters are

n = 1

t = 1 min

R = 20 km

By using the given equation, we can calculate the number of total distance

n = s / (2π . R)

1 = s / (2π . 20km)

s = 40π km

Hence, in one minute, the speed of object is

v = s / t

v = 40π / 1

v = 40π km/min

The acceleration is zero because the object moves at a constant speed.

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If a  book of mass 0.4 kg is pushed to the left across a table with a force of 2.4 N. Kinetic friction provides a force of magnitude 0.8 N, then the normal force acting on the book would be 3.92 Newtons.

Friction is a type of force that resists or prevents the relative motion of two physical objects when their surfaces come in contact.

As given in the problem If a  book of mass 0.4 kg is pushed to the left across a table with a force of 2.4 N. Kinetic friction provides a force of magnitude 0.8 N,

The normal force = m × g

                             =  0.4 × 9.8

                             = 3.92 Newtons

Thus, the normal force acting on the book would be 3.92 Newtons.

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According to the given statement Therefore, as the wavelength of a wave decreased, its frequency increased.

The colour of light is defined by its wavelength, and the frequency of sound is controlled by its wavelength. The visual spectrum of light has wavelengths between about 700 nm (red) to 400 nm (violet). The span of acoustic signal frequencies is roughly 17 mm to 17 m.

By measuring the distance between any two identical locations on adjacent waves, the wavelength can always be found. When determining the wavelength of a longitudinal wave, the distance from one compression to the next or from one rarefaction to the next is measured.

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When a hillside is subjected to gravity, the slope material will tend to move downhill. The force that resists this movement is called "friction."

For example, imagine two objects: A ball and an apple. If you were to slide the apple across the floor towards the ball, they would eventually meet up—but it would take longer than if you pushed them apart and then slid them together again. That extra distance between them is because of their resistance to sliding across each other's surfaces; their friction with each other keeps them from moving too far at once.

If you push hard enough against a surface (like pushing on your couch or chair), then you'll see that pushing harder makes it easier for you to push even harder against the same object (because there's less resistance);

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The ball with a initial velocity of 22 m/s and an angle of 20 degrees above the horizontal covers a distance of 31.6 m, before returning to the ground.

R = u² sin 2θ / g

R = Horizontal range

u = Initial velocity

θ = Angle of projectile made with horizontal

g = Acceleration due to gravity

θ = 20°

u = 22 m / s

g = 9.8 m / s²

R = 22² sin 2 ( 20 ) / 9.8

R = 484 * 0.64 / 9.8

R = 31.6 m

Horizontal range of a projectile is the horizontal distance covered by an object in projectile motion.

R = Horizontal component * Total time

R = u cos θ * 2 u sin θ / g

R = u² ( 2 sin θ cos θ ) / g

R = u² sin 2θ / g

Therefore, the ball will go 31.6 m before returning to the ground

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Planetary motion can be explained using epicycles and deferent. When a planet is nearest to Earth, it shines brighter than when it is farther away. The velocity of planets is uniform and they orbit in a circle.

It wasn't always understood that Earth and other planets revolved around the Sun. The Earth is the solar system's center according to the geocentric theory. The ancient Roman and Egyptian astronomer and mathematician Claudius Ptolemy described one of the geocentric conceptions of the solar system. The planets and Sun have circular orbits around the Earth in Ptolemy's geocentric model of the solar system.

Ptolemy was mistaken regarding the shape or course of planetary orbits as well as the fact that Earth is at the center of the solar system. Astronomers and Ptolemy's observations from that era had a flaw and were inconsistent. The courses of the planets in the sky seemed to be broken by epicycles.

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