Katrina pushes off a flat sidewalk on her skateboard. (Friction is present) What statement best decribes the relationship between the work done by Katrina and the kinetic energy ?


A.The relationship between the work and kinetic energy cannot be determined with the provided information .

B. The amount of work Katrina does on herself and the skateboard is equal to the kinetic energy held by her and the skateboard.

C. The amount of work Katrina does on herself and the skateboard will be greater than the kinetic energy held by her and the skateboard.

D. The amount of work Katrina does on herself and the skateboard will be less than the kinetic energy held by her and the skateboard

Answer:

F1 = ma = 5.5 kg * 10 m/s² = 55 N  (force acts downwards)

F2 = - 50 N (force acts upwards)

net force = 5 N (downwards)

F = ma

a = F/m

a = 5 / 5.5

a = 0.91 m/s²

Explanation:

Since the object is falling downwards, the air resistance acts upwards. We also have a force acting downwards since the rock experiences gravitational acceleration (the value of g above is 10 m/s² for the sake of easier calculation but you can also set it to be 9.81 m/s² which is the more accurate value). Since the air resistance and force due to gravity are acting in opposite directions and force is a vector, we have to put a minus in front of F1 or F2 (it doesn't matter which direction you chose to be the positive one) . Then we calculate the net force, aka the difference between F1 and F2. Finally, knowing the force and the mass, we can calculate the acceleration.

A vacuum is an area devoid of matter, also referred to as "free-space." Practically speaking, only partial vacuums are feasible.

North Americans typically refer to this electrical device as a vacuum cleaner or just a vacuum, whereas Britons typically refer to it as a hoover.

Both terms can be inflected to become verbs such as vacuumed, vacuuming, hoovered, and hoovering. A vacuum is an area devoid of matter, also referred to as "free-space."

Practically speaking, only partial vacuums are feasible. A great bagless upright vacuum, a respectable cordless vacuum, and a simple (but effective!) robot vacuum are just a few of the several vacuums we suggest; they typically cost around $150. Since the middle of the 19th century, a British person has been referred to as a "Limey" (from lime or lemon) in slang.

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The reference point at which vehicle appear to intersect the curb is 2.22km.

To ensure that every parallel park is successfully completed, it is crucial to employ a structured technique and to practice it until a level of proficiency is attained. However, contrary to popular belief, it need not be completed in a single seamless maneuver.

During the maneuver, it is acceptable to advance and make adjustments as long as you do so safely and keep an eye on your surroundings at all times.

Utilizing reference points, a structured technique is applied. Whatever method is used to parallel park, using reference points will help new drivers complete this maneuver.

You should slightly pass the car you plan to park behind. The front of this car is aligned with the center of your passenger-side front window in reference point.

[tex]Reference=\frac{\pi }{\sqrt{2} }[/tex]

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To determine the amount of dark matter in elliptical galaxies, we have to: B. Measure the speeds of stars at different radii from the galactic center and determine how much mass is interior to the orbit.

Dark matter is a type of matter in the universe that does not interact with electromagnetic force. So, unlike ordinary matter, it does not absorb, reflect, or emit light. One of three ways to determine the amount of dark matter in elliptical galaxies is by measuring the galaxy's radius and the average of stars' movement (stars' speed) of that galaxy. We also need to calculate the ratio of mass-to-light from there. This method of measurement is called dynamical mass.

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Answer:

That move is called a pivot foot.

Explanation:

Let's calculate T = 275 (-23.0 - 0.200) and T = -6380 N using the formulas T - W = m a, T = W + ma, and T = m (g + a). B) Network is weight work less stress work. W = F d, T-W d, m a d, (275- 0.200) 23, W = 270.4 J

The tension formula is expressed as. T=mg+ma. where T is tension and g is the gravitational acceleration (9.8 m/s2). The load's mass is M = 275 kg, and its acceleration is a = 0.12 g. Let T represent the cable's tension. The load accelerates upwardly as well as being raised vertically. Because of this, according to Newton's laws, T = M ( g + a ) = 275 1.12 9.8 = 3018.4 N

According to sign convention, the task that the cable has done W = F. d, W = F d cos 180, W = -285 22.0, W = 2.79 103 J The work done by the weight is up and the weight points down, therefore the angle is 180o. W = T d cos 0 W = 2838.6 22.0 W = 6.22 104 J d)

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These are the correct statements. 1) Most asteroids show no evidence of geological activity. 2) Most asteroids have been broken by impacts. 3) There are some asteroids found in Jupiter's orbit. 4) Kirkwood's gaps are caused by Jupiter.

Asteroids have no internal heat, so they are not geologically active.

The asteroids were formed in the early solar system from the gradual agglomeration of smaller particles. Their growth was restricted because of mutual collisions that impacted them to fragment.

The Jupiter trojans are found in the planet Jupiter's orbit.

The Kirkwood gaps are created by the orbital resonances between Jupiter and the asteroid belt. Orbital resonances is defined as the simple integer ratios of the distances between bodies in the case the overlapping gravitational forces create a pattern of strong and weak gravitational fields.

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The heat required  to raise the temperature of 225.0 g of water from 25.0°c to 100.0°c is 70,537.5J

Heat = specific heat capacity of the substance × mass of the substance in grams × temperature difference

Let us rewrite the equation as

q=mcΔT

Where q is the heat required, m is the mass of the substance, c is the specific heat capacity of the substance and ΔT is the temperature difference.

m=225g

ΔT=100-25=72

c=4.18J/gC

Let us substitute the values.

q=225×75×4.18

q=70537.5J

What is specific heat capacity?

Specific heat capacity, or simply specific heat, refers to the heat capacity per unit mass of a pure substance. In other words, it is defined as the amount of heat needed to increase the temperature of 1kg of a material by 1K and is expressed in terms of J/kg·K or equivalently J/kg·°C.

How do you calculate the specific heat of water?

The specific heat capacity of water is 4.18 J/g/°C. We wish to determine the value of Q - the quantity of heat. To do so, we would use the equation Q = m•C•ΔT. The m and the C are known; the ΔT can be determined from the initial and final temperature.

Thus, the heat required is 70537.5J

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The maximum horizontal force that can be applied to the lower block without the upper block slipping is 4.7 N.

We know that, F net = m * a

Given that, mass of the first block = 0.5 kg

Mass of the lower block = 1 kg

The coefficient of friction between the bigger block and the table is 0.2.

The two blocks have 0.35 coefficient of friction.

The force between the table and the blocks is

F k = 1.5 * 9.8 * 0.20 = 2.94 N

The force between the two blocks is

F s = 0.5 * 9.8 * 0.35 = 1.1715 N

So, the maximum horizontal force is

1.715 = Fa - 2.94

Fa = 1.715 + 2.94 = 4.655 N = 4.7 N

Thus, the maximum horizontal force that can be applied to the lower block without the upper block slipping is 4.7 N.

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The coefficient of static friction between the carpet and the box is found to be 0.68.

The mass of the box is 6 kg and a force f of 41 newton is applied at the moment it starts to accelerate from rest across the carpet. If the net force is f and the force of friction between the carpet and the box is Fr.

We can write,

f = Fr

We know, force of friction is given by,

Fr = uN

N is the normal that is equal to weight of body,

u is the coefficient of static friction between the carpet and the box.

Putting values,

f = uN

41 = u(6×10)

u = 41/60

u = 0.68

So, the coefficient of static friction is found to be 0.68.

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The entropy change of the environment is an increase in entropy. So, it must be +8 J/k or more.

The second law of thermodynamics says that any spontaneously occurring process always affects escalation in the entropy (S) of the universe. In simple words, according to this law, an isolated system's entropy never decreases over time.

The law itself mentions that the entropy of an isolated system can't decrease. This is because isolated systems spontaneously evolve towards thermodynamic equilibrium. So, the entropy of the environment will increase.

In some cases the system may be in thermodynamic equilibrium or may go through a reversible process, then the total entropy of a system and its surroundings will remains constant.

The correct answer is option (g) it must be +8J/k or more.

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Two metal spheres with the same charge, q, are in contact and experience an electrostatic force of magnitude F. 2.3x10 N 66.

A mass-bearing item will pull toward another mass-bearing object. The strength of the force is directly proportional to the masses of the two objects and inversely proportional to the square of their distances from one another.

Consequently, the ratio of electric to gravitational force between two electrons is 4.17 1042.

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Distance between two waves' crests or troughs , λ = v/k

What is distance?

Distance is the sum of an object's movements, regardless of direction. Regardless of an object's beginning or finishing position, distance may be defined as the amount of ground it has traversed.

The speed at which a wave moves with particles oscillating about their mean location is known as its way velocity.

v = kλ is the formula for calculating wave velocity.

Where f represents the wave frequency or the number of waves passing through a place in a given amount of time.

The distance between two waves' crests or troughs that follow one another = λ

therefore distance, λ = v/ki

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Answer:

Runner B

Explanation:

its just displacement over change in time

Answer:yes

Explanation:

Given is the diagram to show that water conducts electricity.

Water is a good conductor of electricity. The ions in the water conduct electricity because of their positive and negative charges. When the electrolytes tend to dissolve in the water, they get split into cation or positively charged and anions or negatively charged particles.

Now remove water from beaker and then repeat the steps.

You will observe that bulb doesn't glow.

This experiment confirms that water is good conductor of electricity.

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Answer:

The values are provided in question Velocity V = 12.72…

Explanation:

The velocity will equal v=12.72

Answer:

C. Style

Explanation:

Because if your letters are slanted, it's not mechanical, is it? Neither is it emotional, since that's just not right. As for physical, how is your letters being slanted physical? Therefore, the best answer would be C. Style.

The total volume of the liquid in the graduated cylinder in liters is 0.0472 L.

The total volume of the mixture is the sum of the volume of all the liquid in the cylinder.

Mathematically, the formula for the total volume of the liquid in the graduated cylinder is calculated as follows;

V ( total ) = volume of the liquid + volume of the water

The given parameters include the following;

The volume of the liquid in the graduated cylinder = 46 mL

The volume of water in the graduated cylinder = 1.2 mL

The total volume of the liquid in the graduated cylinder is calculated as;

V (total) =  46 mL + 1.2 mL

V (total) = 47.2 mL

The total volume of the liquid in the graduated cylinder in liters is calculated as;

V (total in liters) = 47.2 mL / 1000 = 0.0472 L

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Refer to the photo taken.

The work done by friction in slowing down the ball from 4 m/s to 3 m/s is 7 J.

Work is said to be done whenever a body is moved by a force through a certain distance.

To calculate the work done by friction, in slowing down the ball, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the work done by friction is 7 J.

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Energy is conserved as the block slides down because kinetic energy is converted to heat energy.

We are looking at the principle of the conservation of energy. We know that the principle of the conservation of energy states that energy can neither be created nor destroyed but it can be converted from one form to another.

Now we know that the energy of the block would remain constant. Given the fact that energy is not created or destroyed, we can see that as the block is sliding down, the block would be loosing energy thus it would become slower. This is because of the fact that friction is working against the movement of the block and the energy that is lost is converted to heat.

Thus we can say that the energy is converted to heat as the the block is slowing down thus energy is conserved.

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To solve this problem, we can use the principle of conservation of momentum, which states that the total momentum of a system remains constant unless acted on by an external force. In this case, the initial momentum of the car before the collision is 3,565 kg * 27.2 m/s = 97,068 kgm/s, and the initial momentum of the truck before the collision is 0 kgm/s, since it is stationary. After the collision, the two vehicles become stuck together and move away from the point of impact with a combined mass of 3,565 kg + 3,692 kg = 7,257 kg. Since the total momentum of the system must remain constant, the combined velocity of the two vehicles after the collision must be equal to the total initial momentum of the car and truck before the collision, or 97,068 kg*m/s.

Therefore, the combined velocity of the two vehicles after the collision is 97,068 kg*m/s / 7,257 kg = 13.4 m/s. This is the speed at which the two vehicles move away from the point of impact. Note that this is a bit less than half the initial speed of the car before the collision, which is expected since the combined mass of the car and truck is greater than the mass of the car alone, and the momentum of the system must be conserved.

The force of impact at 20 mph is two times that at 10 mph speeds.

An object can change its size or shape, begin moving, stop moving, accelerate, or decelerate as a result of a force acting on it. When two things contact, they exert pressures on one another that are identical in size but directed in the opposite direction.

The combined effect of all the forces acting on an object is known as the "resultant force," and it is the same as if only one force were to be operating on the object in that direction. To alter an object's velocity, the resulting force is necessary.

The force required for increasing speed 20 mph of an object of mass m at an interval of time t be = m×20/t.

The force required for increasing speed 10mph of an object of mass m at an interval of time t be = m×10/t.

Hence, the force of impact at 20 mph is two times that at 10 mph speeds.

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The statement that best identifies her speed at each second is as follows: the sky driver has the fastest speed at 4 seconds (option B).

Air resistance is the action of friction that slows something moving through air.

Air resistance is dependent on velocity, area, and shape of the object going through the air. Altitude, temperature, and humidity change air density and, consequently, its resistance.

The higher the speed and the bigger the area, the higher the resistance. As speed increases so too does the frequency of the collision of air molecules with the object. This results in an increase in air resistance.

Therefore, as the sky driver with a weight of 500N increases in air resistance, the speed also increases.

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When the length of a simple pendulum, which oscillates with minimal amplitude, is doubled, the frequency of the oscillation stays the same.

In physics, amplitude refers to the greatest displacement or distance that a spot on a vibration or wave can move relative to its equilibrium location. It is equal to the half-length of the vibration path.

The amplitude, which is measured in metric units (m), is the largest displacement that a medium's particles can experience from their average positions during the propagation of a wave. Meters are the SI unit of displacement. So, the amplitude unit in SI is the meter.

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Momentum is force * time. Momentum is also a change of momentum. that's why,

power * time

=

change in dynamics

For constant force, doubling the collision time doubles the momentum, resulting in a doubling of the momentum change.

The change in momentum is equal to the product of the change in mass and velocity. The mass remains the same because it is a constant value. It is the change in velocity that causes the change in momentum. The change in momentum is denoted by the symbol Δp.

What is the formula for momentum change?

1) The change in momentum is equal to the product of the change in mass and velocity. ⇒ΔP=m.

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Answer:

Explanation:

Momentum is force * time. Momentum is also a change of momentum. that's why,

power * time

=

change in dynamics

There are two reasons why a golf ball does not bounce as high as the initial drop point height. First, when the golf ball hits the ground, it experiences a force of impact that causes it to deform slightly. This deformation dissipates some of the energy from the initial drop, reducing the height of the bounce.

Second, when the golf ball bounces, it experiences friction with the ground, which also dissipates some of the energy from the initial drop. This further reduces the height of the bounce. Together, these two factors explain why a golf ball does not bounce as high as its initial drop point height.

Hello,

I hope you and your family are doing well!

To find the velocity of the dart and apple just after the dart is embedded, we can use the principle of conservation of momentum. According to this principle, the total momentum of a closed system (such as the dart and apple) is constant, meaning that the total momentum before and after an interaction (such as the dart being thrown) must be the same.

The momentum of an object is equal to its mass times its velocity, so the total momentum of the dart and apple before the dart is thrown is:

p1 = (0.6 kg)(10.8 m/s) + (1.9 kg)(0 m/s) = 6.48 kg*m/s

After the dart is thrown, the total momentum of the dart and apple is:

p2 = (0.6 kg)(v) + (1.9 kg)(v) = 2.5v kg*m/s

Since the total momentum before and after the interaction must be the same, we can set p1 equal to p2 and solve for v:

6.48 kgm/s = 2.5v kgm/s

v = 6.48 kgm/s / 2.5 kgm/s

v = 2.592 m/s

The answer is 2.592 m/s.

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Happy Holidays!

Answer: To find the velocity of the dart and apple after the dart is embedded, you can use the principle of conservation of momentum. This principle states that the total momentum of an isolated system remains constant, unless acted upon by an external force.

In this case, the dart and apple form an isolated system, so their total momentum must remain constant.

The momentum of the dart before it is embedded is given by the formula p = mv, where p is momentum, m is mass, and v is velocity. The momentum of the dart is therefore 0.6 kg * 10.8 m/s = 6.48 kg*m/s.

After the dart is embedded, the total momentum of the dart and apple is also 6.48 kg*m/s. We can find the velocity of the combined system using the same formula, p = mv. The mass of the combined system is the sum of the masses of the dart and apple, or 1.9 kg + 0.6 kg = 2.5 kg.

Substituting these values into the formula, we get:

p = mv

6.48 kg*m/s = 2.5 kg * v

v = 2.592 m/s

This is the velocity of the dart and apple after the dart is embedded.

Answer:Cutting, bending, dissolving, freezing, boiling, and melting

Explanation: