Hannah puts 25,000 joules of work into the machine. The machine, in turn, puts out 21,000 joules of work. What is the efficiency of the machine?

Answer:

43.3 m/s.

Explanation:

Assuming the potential energy is due to the gravitational potential energy, we can use the conservation of energy to find the kinetic energy:

Total energy = Potential energy + Kinetic energy

Kinetic energy = Total energy - Potential energy

Kinetic energy = 300 J - 40 J = 260 J

However, we need to know the mass of the object to convert the kinetic energy to velocity. We can use the potential energy to find the mass:

Potential energy = mgh

40 J = m(9.81 m/s^2)(300 m)

m = 0.137 kg

Now we can use the kinetic energy to find the velocity:

Kinetic energy = (1/2)mv^2

260 J = (1/2)(0.137 kg)v^2

v^2 = (2*260 J) / 0.137 kg

v = 43.3 m/s (rounded to one decimal place)

Therefore, the kinetic energy is 260 J and the velocity of the object when it reaches the ground is 43.3 m/s.

Answer:

I'm positive the Answer to this would be C :)

false. The general momentum equation may be used to evaluate both elastic and inelastic collisions, but it cannot tell whether a collision is elastic or inelastic on its own.

The quantity of kinetic energy preserved during the impact determines the definition of elastic and inelastic collisions. Kinetic energy is conserved in an elastic collision, which means that the total kinetic energy before and after the impact stays constant. Some kinetic energy is lost in an inelastic collision, and the total kinetic energy after the collision is less than the total kinetic energy before the contact. To evaluate whether a collision is elastic or inelastic, one must examine the amount of kinetic energy preserved during the collision, in addition to applying the general momentum equation.

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Answer:

procrastinating

Explanation:

procrastinating is when someone dose not want to do work

Explanation:

if force is applied but object do not move then

it is situation for no work done

Answer:

40KJ

Explanation:

m=200g

V=20m/s

Ek=?

Ek=(m*V²)/2

Ek=(200*20²)/2

Ek=(200*400)/2

Ek=80 000/2

Ek=40 000 J =40KJ

Answer:

According to Newton's third law of motion, the reaction force is equal to the action force.

Explanation:

Newton's third law of motion states that for every action there is an equal and opposite reaction. This means that if one object exerts a force on a second object, the second object exerts an equal force in the opposite direction. When Plate X pushes on Plate Y with the action force (Fx), Plate Y must push back with an equal force (Fy).

Therefore, the best explanation is that according to Newton's third law of motion, the reaction force is equal to the action force.

For every action, there has equal and opposite reaction - this statement best describes the action and reaction forces on the plates.

As a result of this interaction, there are two forces: one from plate X and one from plate Y. The third law of motion of Newton deals with these two forces, which are referred to as action and reaction forces. Newton's third law is officially expressed as follows: There is an equal and opposite reaction to every action.

The implication of the statement is that there are always two forces acting on the two interacting objects. The force acting on the first object is equal in size to the force acting on the second. The force acting on the first object is acting in the opposite direction to the force acting on the second object. Force pairs—equal and opposing action-reaction force pairs—always exist in pairs.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 1000 × 2

We have the final answer as

Hope this helps you

The number of atoms on either side of the reaction equation must match for there to be a balanced reaction equation.

The correct option is C.

Whether it originate from the same element or another, two or more chemically bonded atoms make up a molecule. For instance, the combination of two atoms of hydrogen and an oxygen atom yields one mole of a material.

Among the first things you discover in chemistry is this: Because atoms and molecules are so little, numbering them by the trillions and trillions is as useless as counting them one by one because even a few milligrams of a substance contain so many atoms or molecules. Therefore, chemists employ a unit known as the mole.

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Brian's acceleration was \(0.2 m/s^{2}\). This means that his velocity increased by 0.2 m/s every second during the 4 seconds.

To find Brian's acceleration, we can use the formula: acceleration = (change in velocity) / (time taken)

The change in velocity is the difference between his final velocity and initial velocity: change in velocity = final velocity - initial velocity

So, we have: change in velocity = 2 m/s - 1.2 m/s = 0.8 m/s

The time taken is: time taken = 7 s - 3 s = 4 s

Now we can plug in these values to find the acceleration: acceleration = (0.8 m/s) / (4 s) = \(0.2 m/s^{2}\)

Therefore, Brian's acceleration was \(0.2 m/s^{2}\). This means that his velocity increased by 0.2 m/s every second during the 4 seconds.

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Answer:

mark me as the brainliest plss

Answer:

A chemical reaction is a process that occurs when two or more molecules interact to form a new product(s).

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Example:

A popular example of an endothermic chemical reaction is photosynthesis. During this process, plants absorb energy from the Sun and convert it into carbon dioxide and water into glucose and oxygen.

An exothermic reaction releases energy into the surrounding of the system.

Example:

the chemical reaction between sodium and chlorine results in the formation of sodium chloride (also known as common salt).

The surface temperature of Betelgeuse is approximately 3,622 K.

The surface temperature of Betelgeuse can be calculated using Wien's Law, which states that the wavelength at which the radiation from a black body (in this case, the star) peaks is inversely proportional to its temperature.

Using the given wavelength of 800 nm, we can solve for the temperature using the equation λmax = b/T, where b is Wien's constant.

Substituting the values, we get T = b/λmax = 2.898 x 10^-3 m K / 800 x 10^-9 m = 3,622 K.

Therefore, the surface temperature of Betelgeuse is approximately 3,622 K.

This is significantly cooler than the sun's surface temperature of about 5,500 K, which is why Betelgeuse appears red in color. Its lower temperature also indicates that it is in the later stages of its life, as it has exhausted most of its hydrogen fuel and is beginning to cool and expand into a red giant.

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The current provided in each branch for 12V circuit are 6 A and 4 A.

The total current provided for the 12 V circuit is 10 A.

The current provided in each branch for 9V circuit are 4.5 A, 3 A and 9 A.

The total current provided for the 12 V circuit is 16.5 A.

The current provided in each branch of the parallel circuit is calculated as follows;

For the 12V circuit;

I = V/R

where;

branch 1 = 12/2 = 6 A

branch 2 = 12/3 = 4 A

Total resistance;

1/Rt = 1/2 + 1/3

1/Rt = 5/6

Rt = 6/5 = 1.2 ohm

Total current is calculated as;

I_t = 12 V/1.2 ohm = 10 A

For the 9 V circuit:

branch 1 = 9/2 = 4.5 A

branch 2 = 9/3 = 3 A

branch 3 = 9/1 = 9 A

Total resistance;

1/Rt = 1/2 + 1/3 + 1/1

1/Rt = 11/6

Rt = 6/11 = 0.545 ohms

Total current is calculated as;

I_t = 9 V/0.545 ohm = 16.5 A

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Mineralogically, barite is a sulfate, bornite is a sulfide, cuprite is an oxide, magnesite is a carbonate.

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Among the mineral groups, barite is a sulfide mineral, bornite is a sulfide mineral, cuprite is an oxide mineral, and magnesite is a carbonate mineral.

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Answer:

he magnetic field is greater because the magnetization of the material is added

Explanation:

The magnetic field in a solenoid is given by the relation

          B₀o = μ₀ n I

where n is the density of turns and I the current

When we put a magnetic material inside solenoid

the magnetic field is

         B = B₀ + μ₀ M

where M is called the magnetization of the material and corresponds to the alignment of the magnetic moments of the atoms with the field, therefore the total field is much greater, it should be noted that the part of Bo increases with the current, but the magnetization has a maximum value.

Consequently the magnetic field is greater because the magnetization of the material is added

Answer:

(a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Explanation:

Given that,

Radius = 5000 m

Time = 400 second

We need to calculate the speed of the airplane

Using formula of speed

\(v=\dfrac{d}{t}\)

\(v= \dfrac{2\pi r}{t}\)

Put the value into the formula

\(v=\dfrac{2\times\pi\times5000}{400}\)

\(v=78.53\ m/s\)

We need to calculate the centripetal acceleration

Using formula formula

\(a=\dfrac{v^2}{r}\)

Put the value into the formula

\(a=\dfrac{78.53^2}{5000}\)

\(a=1.234\ m/s^2\)

Hence, (a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

There are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible. Therefore, people may continue to purchase gasoline despite an increase in price.

One item that is common in our society that I believe is elastic is fast food. Elasticity is the degree to which changes in price affect demand for a good or service.

Fast food is elastic because it has many substitutes such as restaurants, home-cooked meals, and even other fast-food chains. Fast food is also highly responsive to price changes, which means that a small change in price can cause a large change in demand.

For example, a $1 price increase for a burger meal at a fast-food chain might cause many people to switch to a competitor with a cheaper price. Thus, fast food is an elastic product in our society.One item that is common in our society that I believe is inelastic is gasoline.

Gasoline is an inelastic product because it has few substitutes and people need it for transportation. If the price of gasoline increases, people may continue to purchase it even if it means spending more money because there are few alternative options.

Additionally, there are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible.

Therefore, people may continue to purchase gasoline despite an increase in price.

For example, if the price of gasoline increases by $1, a consumer will still purchase gasoline because they require it to get to work or school. Thus, gasoline is an inelastic product in our society.

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One item in our society that I believe is elastic is the price of gasoline  because of  various alternatives to gasoline and the proportion of income spent. An item in our society that I believe is inelastic is medical treatment because of the necessity of medical treatment and lack of substitutes.

Firstly, the availability of substitutes contributes to the elasticity of gasoline. In our society, there are various alternatives to gasoline, such as electric vehicles or public transportation. When the price of gasoline increases, consumers have the option to switch to these substitutes, reducing their demand for gasoline. Conversely, when the price of gasoline decreases, consumers may choose to drive more or purchase larger vehicles, increasing their demand for gasoline. This flexibility in consumer choices demonstrates the elasticity of gasoline.

Secondly, the proportion of income spent on the product also influences the elasticity of gasoline. For many individuals, the cost of gasoline represents a significant portion of their overall budget. When the price of gasoline rises, consumers may have to make adjustments to their spending habits or seek alternative means of transportation to cope with the higher expenses. Conversely, when the price of gasoline decreases, consumers may have more disposable income to spend on other goods and services. This sensitivity to price changes further supports the elasticity of gasoline.

On the other hand, an item in our society that I believe is inelastic is medical treatment. Two determinants of elasticity that contribute to this belief are the necessity of the product and the lack of substitutes.

Firstly, the necessity of medical treatment makes it an inelastic product. When individuals require medical treatment, they often have no choice but to seek the necessary healthcare services regardless of the price. This is especially true for life-saving procedures or medications. The demand for medical treatment is driven by the urgency and importance of preserving one's health, which leads to a less responsive consumer behavior to price changes.

Secondly, the lack of substitutes also contributes to the inelasticity of medical treatment. In many cases, there are limited alternatives or substitutes available for specific medical treatments. For example, if a person requires a specific surgery or medication to treat a condition, they cannot easily switch to a different treatment option to lower their expenses. The lack of viable substitutes reduces consumer choice and makes the demand for medical treatment less responsive to changes in price.

In summary, the price of gasoline is elastic due to the availability of substitutes and the proportion of income spent on the product. On the other hand, medical treatment is inelastic due to its necessity and the lack of substitutes. These determinants of elasticity highlight the different levels of responsiveness to price changes in these two common items in our society.

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Answer:This is the Difference Between a Hypothesis and a Theory. ... In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.

Explanation:

Answer:

my answer is A:sertion

Explanation:

why is because silent substitution will cause people to die

Answer:

47.43 m/s

Explanation:

Given that,

Final speed of a plane, v = 0

Distance, d = 180 m

Acceleration of the plane, a = -6.25 m/s² (deceleration )

We need to find the plane's velocity. Let it was u. So, using the third equation of kinematics as :

\(v^2-u^2=2ad\\\\u^2=0^2-2\times (-6.25)\times 180\\\\u=\sqrt{2250} \\\\u=15\sqrt{10}\ m/s\\ \\\text{or}\\\\u=47.43\ m/s\)

So, the plane's velocity when it first touched the landing strip is 47.43 m/s.

The speed of the ring's center is  (e) 5.5 m/s.

The speed of the ring's center can be found using conservation of energy. At the highest point, the ring has gravitational potential energy, which is converted to kinetic energy at the lowest point. Assuming no friction, all of the energy is converted to rotational and translational kinetic energy.

The gravitational potential energy at the highest point is given by mgh, where m is the mass of the ring, g is the acceleration due to gravity, and h is the height of the highest point. Since the ring is released from rest, the initial kinetic energy is zero.

At the lowest point, the ring has both rotational and translational kinetic energy. The translational kinetic energy is given by 1/2 mv^2, where v is the speed of the ring's center. The rotational kinetic energy is given by 1/2 Iω^2, where I is the moment of inertia of the ring and ω is the angular speed of the ring.

Since the ring is rolling without slipping, the speed of the ring's center is equal to the product of the angular speed and the radius of the half-pipe. Therefore, we can relate v and ω as v = ωr, where r is the radius of the half-pipe.

Setting the initial potential energy equal to the final kinetic energy, we have:

mgh = 1/2 mv^2 + 1/2 Iω^2

Substituting v = ωr and I = mr^2/2 (for a solid ring), we get:

mgh = 1/2 mv^2 + 1/4 mv^2
mgh = 3/4 mv^2
v^2 = 4gh/3

Substituting the given values for h and r, we get:

v^2 = 4(9.8 m/s^2)(2.5 m)/3
v^2 = 32.67 m^2/s^2
v ≈ 5.71 m/s

Therefore, the speed of the ring's center as it passes through the lowest point is approximately 5.71 m/s, which is closest to answer choice (e) 5.5 m/s.

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The position of the ball as a function of time is given by x=(5.5m/s)t+(−9m/s2)t2. This is a quadratic equation in t, where x is the position of the ball at time t, 5.5 m/s is the initial velocity of the ball, and -9 m/s^2 is the acceleration due to gravity

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The uniform movement allows finding the results for the helicopter displacement during the 10 s is: 700 m

Kinematics studies the motion of bodies, finding relationships between the position, velocity and acceleration of the body, in the special case that the acceleration is zero, it is called uniform motion and is described by the equation

          \(v = \frac{\Delta s}{t}\)

Where v is the average velocity, Ds is the displacement and t is the time

          Δs = v t

They indicate that the average speed is 70 m / s and the travel time is t=10.0s

Let's calculate

          Δs = 70 10.0

          Δs = 700 m / s

In conclusion using the uniform movement we can find the results for the helicopter displacement is: 700 m

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The magnitude of the helicopter's displacement is 700 meters.

Given the following data:

To find the magnitude of the helicopter's displacement:

Velocity can be defined as the rate of change in displacement (distance) with time.

Also, velocity is a vector quantity and as a result of this, it has both magnitude and direction.

Mathematically, velocity is given by the formula;

\(Velocity = \frac{displacement}{time}\)

Making displacement the subject of formula, we have:

\(Displacement = velocity\) × \(time\)

\(Displacement = 70\) × \(10\)

Displacement = 700 meters.

Therefore, the magnitude of the helicopter's displacement is 700 meters.

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Answer:

The Reactants                                                       Products                          

Copper sulfate + zinc             →                        Zinc sulfate + copper

aluminum + copper chloride     →                    Aluminum chloride + Copper

Copper + Oxygen                     →                      Copper oxide

Explanation:

The Reactants                                                       Products                          

Copper sulfate + zinc                                        Zinc sulfate + copper

aluminum + copper chloride                            Aluminum chloride + Copper

Copper + Oxygen                                             Copper oxide

First reaction can be described as a single replacement reaction

Second reaction is also a single replacement reaction just like the first reaction

The third is a synthesis reaction ( i.e. reaction in which elements combine to form single compound )

Answer:

the answer is D

Explanation:

To test the flow of electric current through a circuit we can use a lightbulb. If a current is generated the bulb will light with brightness. Thus, option D is correct.

An ammeter is an electric device used to measure the current through a circuit. The current in ampere, milliampere or microampere is recorded by the ammeter through the deflection of its needle.

A magnetic field is always associated with an electric field where, the fields will be right angled to each other. A moving magnet in turn causes an electric current like a moving charge make an electric current.

To light a bulb electrical energy is needed. Thus, we can  test the deflection in electric field using a a light bulb connected to the circuit. If there is a fine passage of electricity, the bulb will lighten. Thus, option D is correct.

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In series combination less rate of joule hating should be observed as compared to when connected in parallel combination .

Joule heating, also known as resistive, resistance, or Ohmic heating, is the process by which the passage of an electric current through a conductor produces heat.

Joule's first law states that the power of heating generated by an electrical conductor equals the product of its resistance and the square of the current:

When two or more resistors are connected end to end consecutively, they are said to be connected in series combination. The combined resistance of any number of resistances connected in series is equal to the sum of the individual resistances.

When two or more resistances are connected between the same two points, they are said to be connected in parallel combination. The reciprocal of the combined resistance of a number of resistances connected in parallel is equal to the sum of the reciprocals of all the individual resistances.

Rate of joule heating can be calculated by the formula

Power = \(V^{2}\) / R

V = voltage

R = resistance

When both are connected in series than their equivalent resistance will be more as compared to when they are connected in parallel.

Power is inversely related to resistance , if voltage is constant

In series combination less rate of joule hating should be observed as compared to when connected in parallel

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Answer:

B

Explanation:

hair can be a safety hazard

Answer:

I think 100V but I'm not sure.