Question 8 of 10
A bar of gold has a temperature of 27°C, and a bar of aluminum has a
temperature of 22°C. Which statement explains why the bar of gold has a
higher temperature?
A. The aluminum bar has fewer particles than the gold bar.
B. The particles that make up the gold bar are larger.
OC. The particles that make up the aluminum bar have more potentia
energy.
OD. The particles that make up the gold bar are moving more quickly.
SUBMIT

Answer: Wrong

Explanation:

The statement that accurately describes  the relationship between bond strength and the melting and boiling points of a substance is; "substances held together by ionic bonding have higher melting  and boiling points than those held together by hydrogen bonding."

Intermolecular forces refers to forces of attraction that holds molecules together in a particular state of matter. The nature and magnitude of intermolecular forces impacts on the magnitude of the melting and boiling points of substances.

Substances held together by ionic bonding have higher melting  and boiling points than those held together by hydrogen bonding. The bonds between ionic substances can only be broken at very high temperature.

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Answer:

the advantage gained by the use of a mechanism in transmitting force specifically : the ratio of the force that performs the useful work of a machine to the force that is applied to the machine.

Explanation:

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device trades off input forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.

Answer:

No. A vacuum does not exist at an altitude of 75,000 ft

Explanation:

There is naturally a decrease in air pressure as one goes higher into the atmosphere. However, vacuum conditions are not actually present within the atmosphere as there are still significant amounts of gases even at really high altitudes.

To prove this we know that planes cannot fly in a vacuum, because they need to burn air in order to gain propulsion from their engines.

One military plane - the SR-71 flew at about 90,000 feet.

This is a lot higher than 75,000 feet. For it to be able to at that altitude, it means that there was a significant quantity of air left even at 90,000 feet.

Managerial objectives are essential for guiding and directing the efforts of an organization towards specific goals. These objectives serve as a roadmap to achieve desired outcomes and provide a framework for decision-making and resource allocation. They help in setting clear expectations, aligning efforts, and evaluating performance.

The SMART concept is a helpful framework for setting effective managerial objectives. SMART stands for Specific, Measurable, Achievable, Relevant, and Time-bound. By applying these criteria to objectives, they become more focused, well-defined, and actionable.

1. Specific: Objectives should be clear and specific, leaving no room for ambiguity or misinterpretation. They should answer the questions of what, why, who, and how.

2. Measurable: Objectives should be quantifiable or have some criteria for measuring progress and success. This enables tracking and evaluation of performance.

3. Achievable: Objectives should be realistic and attainable within the given resources, capabilities, and constraints of the organization.

4. Relevant: Objectives should align with the overall strategic direction and priorities of the organization. They should contribute directly to the desired outcomes and address key challenges or opportunities.

5. Time-bound: Objectives should have a defined timeframe or deadline for completion. This creates a sense of urgency and helps in prioritizing activities.

By applying the SMART concept, managerial objectives become more effective in providing clarity, focus, and measurability. They enhance accountability, enable better planning and resource allocation, and improve decision-making by providing a clear framework for evaluation and adjustment.

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Radio/TV waves has the lower energy than microwaves.

Answer:

Yes

Explanation:

Its a good game.

Answer:

oof

Explanation:

No.of primary turns/no.of secondary equal to current in primary /current in secondary therefore 200/120=3.50/C.in secondary =2.1A

Answer:

Generally, when thermal energy is transferred to a material, the motion of its particles speeds up and its temperature increases. There are three methods of thermal energy transfer: conduction, convection, and radiation. ... Convection transfers thermal energy through the movement of fluids or gases in circulation cells.Convection. When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection. The fluid above a hot surface expands, becomes less dense, and rises.

Astronomers have measured the separations between other galaxies using studies of Cepheid variables. They contrast the apparent and intrinsic brightness of the Cepheid variable. The distance is determined by the discrepancy between the observed and real brightness.

Pulsating stars known as cephoid variables periodically carry I brightness. They are crucial because the period-brightness law, which is a crucial tool for calculating distance, shows that the cepheid period's luminosity increases with length.

Cepheid variables pulse between dim and brilliant phases over a predictable period of time, often between one and 70 days, making them useful for mapping objects in space. The star's brightness may be calculated using the interval between its successive brightest spots.

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Answer:

D.

Explanation:

cycle.

I think it’s a cycle because a wave pattern is kind of like a type of cycle because it happens over and over again.

The calculated answer is 1.96kg * m \s2\s /2. The energy that is stored when a force is used to deform an elastic object is known as elastic potential energy.

Until the force is released and the object springs back to its original shape, doing labor in the process, the energy is retained. The object may be compressed, stretched, or twisted during the deformation. Since you are aware of the spring constant k, which is 144 N/m, and the spring stretch from equilibrium position x, which is 16.5 cm, or 0.165, you can use the equation

PE = 2 1 kx 2

= 2 1144(.165) 2

to determine the potential energy of the spring.

This, if you prefer SI terms, is kg * m 2 /s2, or 1.96 Joules.

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Answer:

(A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

Explanation:

Given that,

Mass of rocket = 5 kg

Force = 80 N

Time = 4 sec

(A). We need to draw the figure

The force acting on the rocket at each of the intervals is shown in figure.

The force acting on the rocket is mg.

(B). We need to calculate the initial upward acceleration of the rocket

Using balance equation

\(ma=F-mg\)

\(a=\dfrac{F-mg}{m}\)

Put the value in the equation

\(a=\dfrac{80-5\times9.8}{5}\)

\(a=6.2\ m/s^2\)

Hence, (A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

When the horizontal and vertical components of the resultant force are equal to each other, the force that is independent is the resultant force. The two forces that are dependent on each other are the horizontal force and the vertical force.

The relationship between the two forces that are dependent on each other is that they must have equal magnitudes and opposite directions. This means that the magnitude of the vertical force must be equal to the magnitude of the horizontal force, and the vertical force must be in the opposite direction of the horizontal force. This allows the two forces to cancel each other out, resulting in a resultant force of zero.

To further explain, let us consider an example of a block being pulled horizontally and upward at the same time. The horizontal force and the vertical force both act on the block in opposite directions and with equal magnitudes, thus creating a resultant force of zero. If the magnitudes of the two forces are unequal, then the block will move in the direction of the larger force.

In conclusion, when the horizontal and vertical components of the resultant force are equal to each other, the independent force is the resultant force, and the two dependent forces are the horizontal and vertical forces. The relationship between the two forces that are dependent on each other is that they must have equal magnitudes and opposite directions.

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The mass of the measuring stick if it is balanced by a support force at the 0.25 m mark is 0.75 kg.The mass of the measuring stick can be found using the principles of torque.

Given that a 1.0 kg rock is suspended by a massless string from one end of a 1 m measuring stick, and is balanced by a support force at the 0.25 m mark. Thus, taking clockwise as the negative direction of torque and counterclockwise as the positive direction, the torques at the 0.25 m mark are:T clockwise = weight of the rock x distance from support forceT clockwise = (1.0 kg)(9.8 m/s²)(0.75 m) = 7.35 NmT counterclockwise = weight of the measuring stick x distance from support forceT counterclockwise = (mass of measuring stick)(9.8 m/s²)(0.25 m) = 2.45 NmFor balance, T clockwise = T counterclockwise. Substituting values,7.35 Nm = 2.45 Nm(mass of measuring stick) = (7.35 Nm)/(2.45 Nm) = 3 kg.

Therefore, the mass of the measuring stick is 3 kg.Subtracting the weight of the rock, the mass of the measuring stick is:mass of measuring stick = 3 kg - 1 kg = 2 kgSo, the mass of the measuring stick if it is balanced by a support force at the 0.25 m mark is 0.75 kg.

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Answer:

Explanation:

For entropy change the formula is

ΔS = ΔQ / T

ΔQ = Δ H

ΔS = Δ H / T

Given

Δ H = + 162.8 kJ

We can take equilibrium temperature as average temperature of the whole process

So, T = 273 + 87 = 360 K

ΔS = Δ H / T

=  162.8 kJ  / 360

= +  0.508 kJ / K .

When the magnitude of the heat transfer for the process is 162.8 kJ, Then the entropy change for the mixing process, in kJ/K is = + 0.508 kJ / K

For The entropy change, the formula is

Then ΔS = ΔQ / T

After that ΔQ = Δ H

Then ΔS = Δ H / T

Given as per question are:

Then Δ H = + 162.8 kJ

Now We can take equilibrium temperature as average temperature of the whole process are:

So, T is = 273 + 87 = 360 K

Then ΔS = Δ H / T

After that = 162.8 kJ / 360

Therefore, = + 0.508 kJ / K.

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The answer is d. all of these. Tree rings provide valuable information about past climates as they grow in response to the environmental conditions of their surroundings.

The thickness of growth rings is affected by factors such as temperature, precipitation, and soil moisture, and can indicate the overall climate conditions during the growing season. The density of growth rings is also influenced by these factors, and can provide information on the severity of drought or other environmental stresses.

Additionally, the presence of frost rings, which are formed when a tree is damaged by frost, can provide evidence of past cold weather events. By analyzing all of these factors together, scientists can gain a comprehensive understanding of past climate conditions, which can inform our understanding of climate change and its potential impacts on the environment.

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The capacitor that has the largest potential difference between its plates is D.

Equation V = Q/C, where V is the potential difference, Q is the charge held on the capacitor, and C is the capacitance, gives the potential difference between the plates of a capacitor.

The four capacitors in the diagram all have the same charge because they are all linked in series. The capacitor with the highest capacitance will therefore have the smallest potential difference, and vice versa.

The capacitor with the smallest capacitance, and consequently the one with the greatest potential difference between its plates, according to the values shown in the diagram, is capacitor D. Therefore, (D) is the correct response.

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According to the question The horizontal velocity of the body is greatest in value at mid-stance for running. the correct option is C

Walking and running are two different ways of travelling by foot, but there are some key differences between them. Running entails a period of time when both feet are in the air and a period of time when both feet are in contact with the ground. When one foot is in contact with the ground, walking always has at least one foot in contact with the ground, whereas running requires both feet to be off the ground for a portion of the stride cycle. These differences affect the way that force is applied to the body, particularly the legs and feet.

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Answer:

Explanation:

d

The method or formula that will be used to determine the specific heat capacity of the metal is c = Q / mΔθ.

The specific heat capacity of a material is the amount of heat required to raise a unit mass of the substance by 1 Kelvin.

Mathematically, the formula for specific heat capacity of a material is given as;

Q = mcΔθ

where;

c = Q / mΔθ

Thus, the method or formula that will be used to determine the specific heat capacity of a material is by dividing the heat capacity with the product of mass of the material and change in temperature.

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Answer:

fable

Explanation:

1. there are roughly 3 × 10^12 more electrons than protons in object A before the two objects come in contact.

2.  there are roughly 4 × 10^12 more protons than electrons in object B before the two objects come in contact.

3.  the net charge on object A after touching is -4.81 × 10^-7 C, and the net charge on object B is +4.81 × 10^-7 C.

The electron is described as a subatomic particle with a negative one elementary electric charge.

We divide the charge by the charge of one electron to get the number of  electrons are there than protons in object A before the two objects come in contact:

excess electrons = charge on object A / charge of one electron

= -4.81 × 10^-7 C / -1.602 × 10^-19 C

≈ 3 × 10^12 electrons

2.

we divide the charge by the charge of one proton to get protons that are there than electrons in object B before the two objects come in contact:

excess protons = charge on object B / charge of one proton

= 6.41 × 10^-7 C / 1.602 × 10^-19 C

≈ 4 × 10^12 protons

3.

charge on object A + charge on object B = 0

-4.81 × 10^-7 C + charge on object B = 0

charge on object B = 4.81 × 10^-7 C

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The tension is in each rope will be 230.535 N .

Tension also known as tensile force is the force developed in a rope, string, or cable when it is stretched by an applied force.

Mass of the gymnast = m = 47 kg

Acceleration due to gravity = g = 9.81 \(m/s^{2}\)

T = m*g

T = 47 * 9.81

T = 461.07 N

Since there are two parallel ropes attached to the ceiling, therefore tension will be equally divided into each rope respectively.

Tension in each rope = t

t = \(\frac{T}{2}\)

t = \(\frac{461.07}{2}\)

t = 230.535 N

The tension in each rope will be 230.535 N, when both the ropes are attached to the ceiling directly above the gymnast.

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Answer:

False

Explanation:

Density is an intensive property of a substance. Intensive properties are those properties that are characteristic of a substance. They do not depend on the amount of substance present.

Since density is an intensive property, each piece of sulphur still has a density of 2g/cm3.

Answer:

6,001′ 0″

Explanation:

Incised by the Colorado River, the canyon is immense, averaging 4,000 feet deep for its entire 277 miles. It is 6,000 feet deep at its deepest point and 18 miles at its widest. However, the significance of Grand Canyon is not limited to its geology.

According to Newton's second law of motion, a net force causes the acceleration of mass according to Fnet = ma.

What is centripetal acceleration ?

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Answer:

Im pretty rusty with this stuff, personally I'd say B, but wait for someone else to answer this or reply to my answer. I don't remember a lot of this type of stuff so... Hope this helps :)

Explanation:

Answer:

D

Explanation:

Interference is the interaction between waves that meet.

The image given, is explained in terms of Newton's 1st law of motion.

Based on Newton's First Law of Motion (Inertia).  An object at rest remains at rest, and an object in motion continues in motion at a steady speed and in a straight path until operated on by an unbalanced force.

Newton's first rule of motion states that if a pan of water were being moved along a track, the water would tend to keep moving ahead. However, the water will appear to splash to the right while it goes to the left. Space is nearly a perfect vacuum, devoid of both gravity and matter. Think about a satellite travelling 17,500 mph around the Earth. If a rock were to be launched from the satellite, it would orbit the earth adjacent to the satellite at a speed of 17,500 mph.

Here, in the given image, it is shown that the sofa is remain in the place unless a person forcefully move it from one place to another.

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