How much work is done in lifting a 6.8 N object from the ground to a height of a 4 m

A girl on a swing may increase the amplitude of the swing's oscillations if she moves her legs at the natural frequency of the swing. This is an example of: This phenomenon is an example of resonance.

Resonance occurs when an external force is applied to a system at its natural frequency, resulting in a significant increase in the system's amplitude. In the case of the girl on a swing, the natural frequency of the swing is determined by its length and the force of gravity. When the girl moves her legs at the natural frequency of the swing, she applies periodic impulses to the swing, synchronizing her motion with the natural oscillations of the swing. As a result, the amplitude of the swing's oscillations increases. This happens because the energy transferred to the swing with each leg movement is added constructively to the existing oscillations, leading to a cumulative effect. Resonance can be observed in various systems, from musical instruments to bridges, and it is often desirable in specific applications. Understanding the concept of resonance allows us to manipulate and control systems by applying forces at their natural frequencies to achieve desired outcomes.

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Answer:

The resistance is 2 ohms

Explanation:

Hopes this helps.

Answer:

Q = k M T    where k is the absorption constant, Q the heat absorbed, M the mass involved and T the temperature change (for change in temperature)

Q1 = 4.18 kJ/kg * 1 kg * 273 deg K     heat contained

Q2 = 4.18 kJ/kg * .5 kg * 373 deg K     heat contained

Q1 = 1141 kJ deg K

Q2 = 780 kJ deg K

Q = Q1 + Q2 = 1921 kJ deg K

T = 1921 / (4.18 * 1.5) deg K = 306 deg K = (306 - 273) = 33 deg Celsius

(The total mass  is now 1.5 kg)

Answer:

2.467×10^7 litres

Explanation:

Using the formula V1/T1 = V2/T2

V1 and V2 are the initial and final volume respectively

T1 and T2 are their respective temperatures

Given

V1 = 7.4×10^7litres

T1 = 120°C

T2 = 40°C

Required

V2

From the formula

V2 = V1T2/T1

V2 = 7.4×10^7(40)/120

V2 = (7.4×10^7)/3

V2 = 2.467×10^7 litres

Hence the new volume of the gas will be 2.467×10^7 litres

The drift velocity (v) of charge carriers in a conductor is given by the following equation: v = I / (n \(\times\) A \(\times\) q).

v = I / (n \(\times\) A \(\times\) q)

where:

v is the drift velocity, measured in meters per second (m/s)

I is the current flowing through the conductor, measured in amperes (A)

n is the number of charge carriers per unit volume of the conductor, measured in per cubic meter (\(m^(-3)\))

A is the cross-sectional area of the conductor, measured in square meters (m^2)

q is the charge of a single carrier, such as an electron, measured in coulombs (C)

This equation relates the drift velocity of the charge carriers to the current flowing through the conductor, the number of charge carriers per unit volume, the cross-sectional area of the conductor, and the charge of a single carrier. The drift velocity represents the average velocity of the charge carriers as they move through the conductor in response to an applied electric field.

The number of charge carriers per unit volume (n) depends on the material of the conductor and the temperature. In metals, the charge carriers are typically electrons, and the number density is on the order of 10^28 to 10^29 electrons per cubic meter.

The cross-sectional area (A) of the conductor is the area of the cross-section of the conductor perpendicular to the direction of the current flow, and is a measure of the amount of material available for the charge carriers to move through.

The charge of a single carrier (q) is typically the charge of an electron, which is approximately 1.6 x \(10^{-19\) coulombs.

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Taking into account the definition of density, the volume of the sample of gold is 0.0646998 L.

Density is defined as the property that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

19.32 g/cm³= 1250 g÷ volume

Solving:

19.32 g/cm³× volume= 1250 g

volume= 1250 g÷ 19.32 g/cm³

volume= 64.6998 cm³= 0.0646998 L (1 cm³= 0.001 L)

In summary, the volume of the sample of gold is 0.0646998 L.

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3415.2 grams

Explanation

to solve this we can use a rule of three

Step 1

Let

water= 100-84%= 16%

so,

for the water , 1 mL = 1 gram , so

now, let represents the mass of the aluminiu, so

a) the ratio is the same, so we have a proportion

Step 2

finally, solve for x

so, the mass of the aluminum is

3415.2 grams

The ideal body position while driving is with the knee slightly bent from the seat while pressing the pedals. The best choice is therefore B.

What significance does proper body posture have?

The right blood flow, which supports and maintains the health of the muscles, tendons, and ligaments, depends on the body's posture.

The picture that is attached contains the entire question.The right body alignment to choose while driving aids in the development of the right control over the vehicle. When pressing the pedals, the knee should be slightly bent and the seat should be adjusted such that the bottom touches the back of the seat. So, choice B is the right one.

The ideal body position for your legs after you adjusted Seat is with your knee

A. is fully tucked in when pressing the pedals

B. is slightly crooked when pressing the pedals

C. is fully extended when pressing the pedals

D. is pressing directly on the pedals

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Answer:

\(E=\dfrac{1}{2}mv^2\)

Explanation:

If m is the mass of the object and v is the velocity of the object. The kinetic energy is due to the motion of an object. It is given by the relation as follows :

\(E=\dfrac{1}{2}mv^2\)

The above formula is used to find the kinetic energy of an object.

Answer:

C)

Explanation:

Earth's Rotation

Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth's rotation. At the same time that the Earth spins on its axis, it also orbits, or revolves around the Sun. This movement is called revolution.

The mass defect in amu/atom is 0.8657.

The mass defect can be calculated by subtracting the mass of the atom from the sum of the masses of its protons, neutrons, and electrons.

Mass defect = (Sum of masses of protons, neutrons, and electrons) - Mass of the atom

The atomic number of iodine (I) is 53, which means it has 53 protons. The mass number of the atom is 110, indicating that it has 110 nucleons (protons and neutrons) in total.

To find the number of neutrons, we subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number = 110 - 53 = 57.

Next, we need to calculate the mass of protons, neutrons, and electrons. The mass of a proton and a neutron is approximately 1.00728 amu, and the mass of an electron is negligible compared to that of a proton or neutron.

Mass of protons and neutrons = (Mass of a proton) * (Number of protons + Number of neutrons) = 1.00728 * (53 + 57) = 1.00728 * 110 = 110.8008 amu.

Now we can calculate the mass defect:

Mass defect = (Sum of masses of protons, neutrons, and electrons) - Mass of the atom

Mass defect = 110.8008 amu - 109.935060 amu = 0.8657 amu.

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Newton’s universal law of gravitation: F = Gm1m2/r2,Explanation: To understand why the value of g is so location dependent, we will use the two equations above to derive an equation for the value of g.

First, both expressions for the force of gravity are set equal to each other.Now observe that the mass of the object - m - is present on both sides of the equal sign.

Thus, m can be cancelled from the equation. This leaves us with an equation for the acceleration of gravity. F = Gm1m2/r2,

The above equation demonstrates that the acceleration of gravity is dependent upon the mass of the earth (approx. 5.98x1024 kg) and the distance (d) that an object is from the centre of the earth.

If the value 6.38x106 m (a typical earth radius value) is used for the distance from Earth's centre, then g will be calculated to be 9.8 m/s2. And of course, the value of g will change as an object is moved further from Earth's centre.

For instance, if an object were moved to a location that is two earth-radii from the center of the earth - that is, two times 6.38x106 m - then a significantly different value of g will be found.

Therefore,  at twice the distance from the centre of the earth, the value of g becomes 2.45 m/s2.

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Answer:

The correct answer is "-1.5 cm".

Explanation:

The given values are:

Object is placed,

u = 2.5 cm

Focal length,

f = 1.5 cm

On applying the lens formula, we get

⇒ \(\frac{1}{u} +\frac{1}{v} =\frac{1}{f}\)

or,

⇒ \(\frac{1}{v} =\frac{1}{u} -\frac{1}{f}\)

On substituting the given values, we get

⇒    \(=\frac{1}{2.5} -\frac{1}{1.5}\)

⇒    \(=\frac{1.5-2.5}{3.75}\)

⇒    \(=\frac{-1}{3.75}\)

⇒ \(v=-3.75 \ cm\)

As we know,

Magnification, \(m=\frac{v}{u}\)

On substituting the values, we get

⇒                           \(=\frac{-3.75}{2.5}\)

⇒                           \(=-1.5 \ cm\)

The bargaining power of suppliers for Suncor Energy is influenced by factors such as supplier concentration, specialized inputs, high switching costs, and the potential for suppliers to integrate forwards. Rivalry in the industry is affected by competitor concentration, industry growth rate, high fixed costs, high exit barriers, and low  differentiation.

1. Bargaining Power of Suppliers:

The bargaining power of suppliers for Suncor Energy can be analyzed based on several factors. If the suppliers in the industry are concentrated and there are only a few of them, it may give them more power to dictate terms and conditions. Additionally, if the suppliers provide specialized inputs that are rare or unique, it can increase their bargaining power. High switching costs, where it is disruptive or expensive for Suncor Energy to change suppliers, can also strengthen the suppliers' position. Furthermore, if suppliers have the ability to integrate forwards, such as low-cost airlines cutting out the use of travel agents, it can further impact the bargaining power.

2. Rivalry in the Industry:

The level of rivalry in the industry can be assessed by considering various factors. Competitor concentration and balance play a role in determining the intensity of competition. If there are a few dominant players or a balanced market share distribution, it can impact the competitive dynamics. The industry growth rate is also important as a high growth rate can lead to more intense rivalry. High fixed costs, such as those associated with infrastructure or equipment, can create barriers to entry and affect the competitive landscape. Similarly, high exit barriers, which make it difficult for companies to leave the industry, can contribute to intense rivalry. Finally, low differentiation among competitors can lead to price-based competition and increased rivalry.

By analyzing these factors, Suncor Energy can gain insights into the overall industry structure and attractiveness. Additionally, assessing recent and expected future changes for each force can help anticipate shifts in the competitive landscape and make informed strategic decisions.

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Answer:

Both fission and fusion release large amounts of energy.

Explanation:

One or more atoms of a different weight to the reactant atom is formed in both fission and fusion reactions. There is a change in weight between the reactant (s) and product (s) in both fission and fusion reactions.

Answer:

t = 9.36 s

Explanation:

Given that,

Initial velocity, u = 0 (at rest)

Final velocity, v = 77 m/s

Acceleration of the airplane, a = 8.2 m/s²

We need to find the time required for an airplane to take off its speed 77 m/s. Let t be the time. using first equation of motion to find it as follows :

v=u+at

\(t=\dfrac{v-u}{a}\\\\t=\dfrac{77}{8.22}\\\\t=9.36\ s\)

so, the airplane will take 9.36 seconds.

Answer:

Line dividing each court half into two sides; the center line separates the left and right service zones.

(a) The given system = y, and = -wé sin can be written in matrix form as[y']=[0 1][-wé sin(y)] [y]It is a homogeneous linear system. Hence, the Jacobian is given byJ=[∂f1∂y ∂f1∂t∂f2∂y ∂f2∂t]=[0 1][-wé cos(y) 0]On evaluating the Jacobian at y = 0, we getJ=[0 1][-wé 0] = [0 -wé][1 0].

Now, to find all the critical points, we need to find y for which y' = 0 and y = 0 and y = kπ, where k is an integer.Using y' = 0, we get0 = -wé sin(y) => y = kπThus, the critical points are given by (kπ,0), where k is an integer.

Evaluating the Jacobian at these points, we getJ[kπ,0] = [0 -wé][1 0] = [0 -wé;-1 0]We see that the system is locally linear at each critical point.

(b) The linearized equilibrium at the origin is a center.To see this, we need to compute the eigenvalues of J(0,0).The eigenvalues of J(0,0) are ±i√wé. Since the eigenvalues have nonzero imaginary parts, the linearized equilibrium is a center.

We can justify it by using the Bendixson’s criterion. Since there are no closed orbits in the system, we can conclude that the nonlinear equilibrium is also a center at the origin.

Also, the nonlinear equilibrium at all other critical points (kπ, 0) is also a center.

(c) The linearized equilibrium at the point x = 1 and y = 0 is a saddle.To see this, we need to compute the eigenvalues of J(1,0).The eigenvalues of J(1,0) are ±√wé. Since the eigenvalues have opposite signs, the linearized equilibrium is a saddle.

We can justify it by using the Bendixson’s criterion. Since there are closed orbits in the system, we can conclude that the corresponding nonlinear equilibrium is also a saddle. Also, the nonlinear equilibrium at all other critical points (kπ, 0) is a center.

In particular, saddles are unstable.

The critical point (kπ, 0) corresponds to the pendulum at rest.

Hence, the physical interpretation of a saddle is that the pendulum is initially disturbed from its equilibrium position and it oscillates in the opposite direction to the direction of the initial disturbance. As t goes to infinity, the amplitude of oscillations decreases.

(d) For w = 1 The solutions near the origin indicate that the nonlinear equilibrium at the origin is a center.

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Answer:

the amount of current that will flow in a lamp is

 Q = C. U = 40.15 = 600 (c)

with Q is  the amount of current that will flow in a lamp

Explanation:

Answer:

I don't knowxudnwmKzomw

Explanation:

hairyehducbaoenxinw

Answer:

99kg m/s

Explanation:

\(p=m\Delta v \\\\\Delta v=20-0.20=19.8m/s \\\\p=5(19.8)=99\)

Hope this helps!

Answer:

Solution,

Initial speed(u)=20 m/s

final speed(v)=0.20 m/s

change in momentum∆P=m(v-u)

∆P=5(0.20-20)

∆P=5*19.8

∆P=99 kg m/s

Momentum of the body is decreased by 99 kg m/s

hope this helps...

Good luck on your assignment...

The total voltage of the circuit is the product of the total current and resistance through the circuit. Hence, the voltage here is 2.17 ×10⁻⁹ V.

Ohm's law states that, the total voltage across a circuit is the product of the current over the circuit and the overall resistance. Let V be the voltage , I and R be the current and resistance respectively.

then,

V = IR.

Given,

R = 3.4 milli Ω = 3.4 × 10⁻³ Ω

I = 0.16 micro amperes = 0.16 × 10⁻⁶ A.

Then voltage V = IR =  0.16 × 10⁻⁶ A ×  3.4 × 10⁻³ Ω

V = 5.4 ×10⁻¹⁰ V.

This is the voltage required for one system. For all the 4 systems,

v  = 4 × 5.4 ×10⁻¹⁰ V = 2.17 ×10⁻⁹ V.

Therefore, the total voltage needed to supply the systems is 2.17 ×10⁻⁹ V.

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The correct answer is not provided in the given options A, B, C, or D. The distance from the axis at which the magnetic field caused by the current is equal in magnitude to Earth's magnetic field is 125 meters.

To find the distance from the conductor at which the magnetic field caused by the current is equal to the Earth's magnetic field, we'll use the formula for the magnetic field around a long straight conductor:

\(B = (de * I) / (2 * \pi  * r)\)

Where B is the magnetic field, μ₀ is the permeability of free space (\(4\pi  * 10^-7 Tm/A\)), I is the current, and r is the distance from the conductor. We want to find the value of r when B equals Earth's magnetic field (0.5 x 10⁻⁴ T).

\(0.5 * 10^-4 T = (4\pi  * 10^-7 Tm/A * 100 A) / (2 * \pi  * r)\)
To solve for r, we can first simplify the equation by cancelling the π terms:

\(0.5 * 10^-4 T = (4 * 10^-7 Tm/A * 100 A) / (2 * r)\)

Now, cancel out the A (Amperes) terms:

\(0.5 * 10^-4 T = (4 * 10^-7 Tm) / (2 * r)\)

Divide both sides by 4 x 10⁻⁷ T:

\(r = (0.5 * 10^-4 T) / (4 * 10^-7 T)\)

Simplify the equation:

r = \(0.5 * 10^3 m / 4\)
r = 500 / 4
r = 125

So, the correct answer is not provided in the given options A, B, C, or D. The distance from the axis at which the magnetic field caused by the current is equal in magnitude to Earth's magnetic field is 125 meters.

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Answer:

momentum

Explanation:

The net impulse delivered to an object always causes a change in the object's momentum. Hence, option (B) is correct.

The given problem is based on the concept of net impulse. The magnitude of force acting on any object for very short interval of time is known as impulse. In the given problem, the transfer of impulse can be explained by the impulse - momentum theorem.

\(F \times t = \Delta P\\\\I= \Delta P\)

Here, I is the impulse.

Thus, we can conclude that the net impulse delivered to an object always causes a change in the object's momentum. Hence, option (B) is correct.

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Answer:

100°C

Explanation:

The heat gained by the ice equals the heat lost by the steam, so the total heat transfer equals 0.

Heat lost by the steam as it cools to 100°C:

q = mCΔT

q = (3 kg) (2.00 kJ/kg/K) (100°C − 120°C)

q = -120 kJ

Total heat so far is negative.

Heat lost by the steam as it condenses:

q = -mL

q = -(3 kg) (2256 kJ/kg)

q = -6768 kJ

Heat absorbed by the ice as it warms to 0°C:

q = mCΔT

q = (6 kg) (2.11 kJ/kg/K) (0°C − (-40°C))

q = 506.4 kJ

Heat absorbed by the ice as it melts:

q = mL

q = (6 kg) (335 kJ/kg)

q = 2010 kJ

Heat absorbed by the water as it warms to 100°C:

q = mCΔT

q = (6 kg) (4.18 kJ/kg/K) (100°C − 0°C)

q = 2508 kJ

The total heat absorbed by the ice by heating it to 100°C is 5024.4 kJ.

If the steam is fully condensed, it loses a total of -6888 kJ.

Therefore, the steam does not fully condense.  The equilibrium temperature is therefore 100°C

Answer:

B

Explanation:

Nonmetal is better insulator than metals

Answer:

B

Explanation:

Just took the quiz.

The net force required to horizontally accelerate a 90 kg person from rest to 66 m/s is  4596.3 N.

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Given;

mass = 90 kg

initial velocity = 0

final velocity = 66 m/s

time = 1.3 sec

V = u + at

66 = 0 + a × 1.3

a = 66/1.3

a = 50.77 m/s²

F = ma

   = 90 × 50.77 N

   = 4596.3 N

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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