A 90-kg fullback is traveling 5.0 m/s and is stopped by a tackler in 1 s. Calculate (a) the original momentum of the fullback, (b) the impulse imparted to the tackler, and (c) the average force exerted on the tackler.

Answer:

o The result of a chemical change is a different  composition; in a physical change, the composition  remains the same.

Explanation:

In a chemical change, new kinds of matter are produced although the atoms are the same.

For physical changes, no new kinds of matter formed. Only the state of substances changes.

Answer:

iii) pressure is a vector quantity.

Answer:

Pick something up with your hand and drop it. When you release it from your hand, its speed is zero. On the way down its speed increases. The longer it falls the faster it travels. Sounds like acceleration to me.

But acceleration is more than just increasing speed. Pick up this same object and toss it vertically into the air. On the way up its speed will decrease until it stops and reverses direction. Decreasing speed is also considered acceleration.

But acceleration is more than just changing speed. Pick up your battered object and launch it one last time. This time throw it horizontally and notice how its horizontal velocity gradually becomes more and more vertical. Since acceleration is the rate of change of velocity with time and velocity is a vector quantity, this change in direction is also considered acceleration.

In each of these examples the acceleration was the result of gravity. Your object was accelerating because gravity was pulling it down. Even the object tossed straight up is falling — and it begins falling the minute it leaves your hand. If it wasn't, it would have continued moving away from you in a straight line. This is the acceleration due to gravity.

In this initial experiment the bowling ball drops straight to the ground whereas the feathers float, owing to air resistance.

He alludes to the earlier experiment by Galileo that tested the same hypothesis.

"Galileo’s experiment was simple," he explains. "He took a heavy object, and a light one, and dropped them at the same time to see which fell fastest."

Although Galileo’s experiment proved two similarly shaped objects would fall at the same speed despite being different weights, he didn’t have access to a vacuum chamber in the 17th Century to conduct Professor Cox's more extravagant experiment.

Professor Cox also used the bowling ball and feather to prove a hypothesis put forward by Albert Einstein.

His Special Theory of Relativity argued that items would not be falling but standing still due to lack of force acting on them.

"Isaac Newton would say that the ball and the feather fall because there’s a force pulling them down: gravity,’ Professor Cox said.

"But Einstein imagined the scene very differently.

"The “happiest thought of his life” [as Einstein called it] was this; the reason the bowling ball and the feather fall together is because they’re not falling.

"They’re standing still. There is no force acting on them at all.

"He reasoned that if you couldn’t see the background, there’d be no way of knowing that the ball and the feathers were being accelerated towards the Earth.

"So he concluded they weren’t."

The tweaking of Newton’s earlier theory enabled Einstein to more accurately define his own theory, which regards the relationship between space and time.

hope it helps you

Answer:

10

Explanation:

a.s = D÷T

= (20+10=30)30÷30

=10

1 m/s is my average speed.

Average speed is the total distance travelled by an object to the total time taken.

i.e.

Average speed = Total distance travelled /Total time taken

\(\overline{v}\) = Δx/Δt

According to the question.

Total distance travelled by me = 20m +10m = 30m

Total time taken by me = 30 sec

By using the formula of average speed

\(\overline{v}\) = Δx/Δt

= \(\frac{30m}{30s}\)

=1 m/s

Hence,1 m/s is my average speed.

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Answer:

83.3m

Explanation:

From the question we are given the following:

initial speed u = 50m/s

acceleration a = -15m/s²

final speed = 0m/s

Required

Stopping distance S

Using the equation of motion:

0² = 50²+2(-15)S

0² = 2500 - 30S

-2500 = -30S

S = 2500/30

S = 83.3m

Hence the stopping distance of the dragster if only the drag chute is used  bring it to rest is 83.3m

Answer: Kinetic energy is the energy an object has because of its motion

(if it needs to be a one worded answer than just type motion)

The potential energy of an object depends on its mass and its height.

The law of conservation of energy states that energy can be neither created nor destroyed, but it can change its form.

Answer:Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.

As expressed by the equation, potential energy depends upon the mass and the height of the object. Any increase in these two quantities will lead to an increase in the amount of potential energy possessed by the object.

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.

A cyclist peddles from 5ft/s to 12ft/s over the distance of 50 ft. The acceleration will take place for 1.19ft/s^2. It can be calculated by the formula v^2-u^2 = 2as.

v^2-u^2 = 2as

a=v^2-u^2/2s =144-25/2(50)

a=119/100 =1.19ft/s^2

What is acceleration?

The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. The rate at which velocity changes is called acceleration.

What three forms of acceleration are there?

The three main types of accelerated motions are uniform acceleration, non-uniform acceleration, and average acceleration.

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A cyclist peddles from 5ft/s to 12ft/s over the distance of 50 ft. The acceleration will take place for 1.19ft/s^2. It can be calculated by the formula v^2-u^2 = 2as.

v^2-u^2 = 2as

a=v^2-u^2/2s =144-25/2(50)

a=119/100 =1.19ft/s^2

The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. The rate at which velocity changes is called acceleration.

The three main types of accelerated motions are uniform acceleration, non-uniform acceleration, and average acceleration.

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Answer:

The correct answer is: Energy is conserved, and it cannot be created or destroyed. This is known as the law of conservation of energy, which states that in a closed system, the total amount of energy remains constant and cannot be created or destroyed, only transformed from one form to another. This means that energy can be converted from one form to another, such as from potential energy to kinetic energy, but the total amount of energy in the system remains the same.

Answer:

51 miles/hour

Explanation:

Talia is on a road trip with some friends. in the first 2 hours, they travel 100 miles. then they hit traffic and go only 30 miles in the next hour. the last hour of their trip, they drive 75 miles. calculate the average speed of talia’s car during the trip. give your answer to the nearest whole number.

The average speed would be 51 miles/hour.

The average speed of a moving object is defined as the total distance traveled relative to the total time taken fro the journey. Mathematically, it is given as:

  total distance traveled/total time taken.

In this case;

Total distance traveled = 100 + 30 + 75 = 205 miles

Total time taken = 2 + 1 + 1 = 4 hours

Therefore;

Average speed = 205/4 = 51.25 miles/hour

To the nearest whole number = 51 miles/hour

The distance from the axis of the force applied is 2.05 m.

The distance from the axis of the force applied is calculated as follows;

The formula for torque;

τ = Fr

where;

Another formula for torque is given as;

τ = Iα

where;

τ = (mr²)α

τ = (25 kg x (0.925 m)²) x (1.84 rad/s²)

τ = 39.36 Nm

The distance is calculated as;

r = τ/F

r = ( 39.36 Nm ) / (19.2 N)

r = 2.05 m

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The period of the wave would range between 2 x 10-2 to 2.5 x 10-5 s. Option A

The period of a wave is the time it takes for one complete cycle of the wave to occur. It is the time interval between two successive points on the wave that are in phase, or the time it takes for the wave to repeat its shape. The period is typically denoted by the symbol T and is measured in units of time, such as seconds (s).

The period is the inverse of the frequency;

T = 1/f = 1/50 = 2 * 10^-2 s

T = 1/f = 1/40,000 = 2.5 * 10^-5 s

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The magnitude of the other force is 23.4 N.

Since only two forces act on the object, the net force F is the vector sum of the two forces acting on the object.

The magnitude of the force F is given by

F = √(F₁² + F₂²)

where,F₁ is the force acting in the positive direction of the x-axis

F₂ is the force acting in the positive direction of the y-axis

The magnitude of the force F can be expressed as

F = ma

Therefore, √(F₁² + F₂²) = ma

We have,F₁ = 8.4 Nm = 3.0 kga = 2.7 m/s²

By substituting the values in the above equation, we get;

√(8.4² + F₂²) = 3.0 × 2.7

F₂ = √(3.0 × 2.7)² - 8.4²

F₂ = 23.4 N

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The function f(x) = x, where 0 x 2, has the following Fourier series: Given that f(x) has an odd period of 2, we may express its Fourier series as follows: F(x) = A0 + [n=1 to] Ancos (n/x) plus bnsin (n/x).

Since f(x) is an odd function, a0 = 0. We may apply the following formulae to determine the Fourier coefficients: a = (2/1) f(x)cos(nx/1)[0 to 1] dx Bn = (2/1) f(x)sin(nx/1)[0 to 1] dx We may determine the coefficients using the following formulas: an is equal to (2/1) [0 to 1] x*cos(nx/1) dx. Bn is equal to (2/1), [0 to 1]x*sin(nx/1)dx. By integrating in pieces, we obtain: a = (2/π^2) [(1-(-1)^n)/(n^2)] bn = (2/π) [(1-(-1)^n)/(n)] The Fourier series of f(x) = x, where 0 x  its Fourier series as follows: F(x) = A0 + [n=1 to] Ancos (n/x) plus bnsin (n/x).2, is as follows: f(x) = Σ(n=1 to ∞) [(2/) (1-(-1)n)/(n))*sin(nx/1)].

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Answer: C

Explanation: convection is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

Hot soup warms the bowl where it sits show conduction. So, the correct option is B.

Heat or electricity can pass through a substance by conduction without the material moving noticeably. When two things with different surface temperatures come in touch, heat energy moves from the warmer object to the colder object until they attain thermal equilibrium.

Because the molecules are in direct touch with one another when conduction of heat occurs, the heat energy is often passed from one molecule to the other. However, the molecules' positions remain unchanged. Simply put, they vibrate against one another.

Electrically charged particles in the medium move when electricity is being conducted. As a result, ions or electrons are often responsible for carrying and moving the electric current.

Therefore, the correct option is B.

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Answer: D. Lever

Explanation: The biceps muscle provides the effort (force) and bends the forearm against the weight of the forearm and any weight that the hand might be holding. Many muscle and bone combinations in our bodies are of the Class 3 lever type.

Resistance

A) The resistance of the copper wire is 0.743 Ω.

B) The resistance of the carbon piece is 219 Ω.

A) To find the resistance of the copper wire, we can use the formula

R = ρL/A

Where R is the resistance, ρ is the resistivity of copper (1.68 x \(10^{-8}\) Ωm), L is the length of the wire, and A is the cross-sectional area of the wire.

The diameter of the wire is 0.700 mm, so the radius is 0.350 mm (or 3.50 x \(10^{-4}\) m). The cross-sectional area is then

A = πr^2 = π\((3.50*10^} ^{-4})^{2} }\)  = 3.85 x \(10^{-7}\)\(m^{2}\)

The length of the wire is 1.70 m. Substituting these values into the formula, we get

R = (1.68 x \(10^{-8}\) Ωm)(1.70 m)/( 3.85 x \(10^{-7}\)\(m^{2}\)) = 0.743 Ω

Therefore, the resistance of the copper wire is 0.743 Ω.

B) To find the resistance of the carbon piece, we first need to find its cross-sectional area. We are given that the piece is a square with sides of 1.2 mm, so the cross-sectional area is

A = \((1.2*10^{-3}m) ^{2}\) = 1.44 x \(10^{-6}\) \(m^{2}\)

Next, we need to find the resistivity of carbon. This can vary depending on the type of carbon and its purity, but a typical value is 3.5 x \(10^{-5}\)  Ωm.

Finally, we can use the formula R = ρL/A, where L is the length of the carbon piece (90.0 cm = 0.9 m). Substituting the values, we get

R = (3.5 x \(10^{-5}\) Ωm)(0.9 m)/(1.44 x \(10^{-6}\) \(m^{2}\)) = 219 Ω

Therefore, the resistance of the carbon piece is 219 Ω.

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Answer: 52.

Explanation: Critical Thinking When a ball is thrown vertically up, it keeps going up until it hits a certain position, and then falls down. At the maximum point, the velocity is instantaneously zero.

I may or may not be a nerd lol.

Hope This Helps!!! : )

Answer:

4,500 kilometers

Explanation:

New York is very far from Los Angeles therefore the distance will be in the thousands.

Answer:

4,500 Km

Explanation:

Tension and compression forces act on diagonal and vertical members respectively in a truss structure.

A truss is a construction that comprises of a progression of interconnected triangles, intended to disperse stacks and give security. The powers that follow up on a bracket can be characterized into two kinds: pressure and pressure powers.

Tension powers are powers that draw on a part, like a rope or link. In a support, strain powers follow up on the corner to corner individuals that structure the triangles. These individuals are under pressure since they are being pulled separated.

Compression forces are forces that push on a part, like a segment or shaft. In a support, pressure powers follow up on the upward individuals that associate the top and base harmonies of the bracket. These individuals are under pressure since they are being crushed together.

Notwithstanding pressure and pressure powers, brackets can likewise be exposed to twisting minutes and shear powers, which are brought about by outer burdens following up on the support.

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Explanation:

ANALYZE

all function graphs are straight lines.

that means that the velocity increases at a constant rate over time.

in formal words : the derivative of a line function (an equation in x of the first order = contains only terms of x with exponent 1 or 0) is always a constant - in fact the slope of the line.

therefore, all these accelerations are constant.

EXPLAIN

as it is clearly visible, and what we all have experienced ourselves when playing with blocks and stuff, or going over slides, or skiing, or ... : the steeper the ramp the faster the acceleration of the object.

the reason is in the size/length of the movement vectors.

going down a ramp the object moves down AND to the side. the bigger the side movement in relation to the down movement, the slower the object moves, and the smaller the acceleration. a straight down "fall" has 0 side movement and so experiences the maximum speed and acceleration.

EVALUATE

as the graphs show, and reasoned by the previous points, the acceleration for angles smaller than 90 degrees is less than the full gravitational acceleration at 90 degrees (free fall).

EXPLAIN second page

the path of a projectile is the sum of the horizontal and the vertical movement.

as with the sliding of objects down a ramp, every movement has a side and a down (or up) movement part.

while the horizontal movement is here considered constant (under ideal conditions), the vertical movement accelerates due to gravity over time, and a prediction needs to combine the information about the starting point, initial velocity and acceleration force (like gravity).

at least based on the information on the paper you are showing.

but I have to point out that depending on what exactly needs to be predicted, usually also the initial angle is needed.

and - also the horizontal movement is not really constant (at least not in Earth), as there is at least friction with the atmosphere, so the projectile usually also negatively accelerates (gets slower) in the horizontal movement over time.

The statement that rules of thumb are known as a non-traditional approach to setting standards is false. Rules of thumb are actually a traditional and informal method of making rough estimations or decisions.

Contrary to the statement, rules of thumb are not considered a non-traditional approach to setting standards. In fact, they have been used for centuries as a traditional and informal way to make rough estimations or decisions. Rules of thumb are practical guidelines or principles that are based on experience or common sense rather than precise measurements or formal procedures.

These rules are often used in various fields, such as engineering, construction, finance, and everyday life. They serve as quick and convenient methods to make approximate calculations or judgments when precise data or detailed analysis may not be available or necessary. For example, the "rule of thumb" that suggests spending around 30% of your income on housing expenses is a commonly used guideline in personal finance.

While rules of thumb can be helpful in certain situations, it's important to recognize their limitations. They are not meant to replace rigorous analysis or professional judgment. Depending solely on rules of thumb can lead to inaccuracies or oversimplifications. Therefore, they should be used with caution and in conjunction with more precise methods when necessary.

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Answer:

the north and south pole

Explanation:

this should be the correct answer

Answer:

Mechanical energy = 35 Joules

Explanation:

Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;

a. Potential energy (P.E): it is an energy possessed by an object or body due to its position above the earth.

b. Kinetic energy (K.E): it is an energy possessed by an object or body due to its motion.

Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body.

Mathematically, it is given by the formula;

Mechanical energy = P.E + K.E

Given the following data;

Potential energy = 15 J

Kinetic energy = 20 J

To find the mechanical energy;

Mechanical energy = P.E + K.E

Mechanical energy = 15 + 20

Mechanical energy = 35 Joules

Answer:

Mechanical energy = 35 Joules

Explanation:

Answer:

Earth is nearest the Sun in July and farthest away in July.

Explanation:

Answer:

Correct Answer: B.

Explanation:

Earth is nearest the Sun in January and farthest away in July. Explanation: According to Kepler's Second Law, a planet travels fastest when it is nearest its sun. This means that Earth is actually closest to the Sun in January, when it is winter in the northern hemisphere!

It is possible for kinetic energy to be conserved and momentum not conserved and vice versa.

Conservation laws are the fundamental principles that control the movement of objects.

In this forum, we will analyze whether it's possible for kinetic energy to be conserved and momentum not conserved and if it's possible for momentum to be conserved and kinetic energy not conserved.

Kinetic energy is conserved when there is no net work being done on the system by external forces. Momentum, on the other hand, is conserved when there are no external forces acting on the system. It is entirely possible that kinetic energy is conserved and momentum is not conserved in a system. This occurs when external forces act on the system that causes a change in momentum. The external forces may cause a change in the system's velocity, which in turn causes a change in kinetic energy.

Momentum is conserved when there are no external forces acting on the system. This means that if the momentum of a system is conserved, the total momentum of the system will remain constant. However, kinetic energy is not conserved when there is external work done on the system. Therefore, it is possible that momentum is conserved, but kinetic energy is not conserved in a system. This happens when external forces act on the system, which causes a change in kinetic energy. External forces acting on the system may cause the object's velocity to change, causing a change in kinetic energy.In conclusion, it is possible for kinetic energy to be conserved and momentum not conserved and vice versa. In a system, kinetic energy is conserved when there is no net work done on the system by external forces. Momentum is conserved when there are no external forces acting on the system.

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Gravitational force; a force of attraction between objects that is due to their masses.

the amount of the gravitational force is directly proportional to the masses of the two items and inversely proportional to the square of the distance between the two objects.

Gravitational force is an attractive force that exists between all objects with mass.

F=Gm₂m₂/d²

Where m1 and m2 are the masses of the objects in kilograms, d is the separation between them in meters, and G is the global gravitational constant (i.e., it has the same value across the universe).

G=6.67 x 10-11 N m2/kg2

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Answer:

B

Explanation: