Explain in terms of internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising.

Answer:

c

Explanation:

A Digital Voltmeter is used to measure AC or DC voltage consumed with the aid of an equipment and for displaying the cost directly in numeric shape as an alternative of the usage of a pointer deflection. It is thus, a voltage-sensitive device.

Image end result for digital voltmeter,

A digital voltmeter (DVM) measures an unknown enter voltage through converting the voltage to a digital value and then shows the voltage in numeric form. DVMs are usually designed around a distinct kind of analogue-to-digital converter known as an integrating converter.

Advantages of electronic voltmeter:

Digital display of the output eliminates human reading errors. Readings are accurate and fast in contrast to analog meters. Digital Voltmeter is more steady and reliable. Smaller in dimension and cost-effective.

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v=p/m

v=2.1 kg x m/s

0.14 kg

v=15 m/s

False. The rule does not necessarily involve holding a compass in your right-hand.

The right-hand rule is a general principle used in physics and engineering to determine the direction of various vectors.

There are different variations of the right-hand rule, but the basic idea is to use your right hand to orient your fingers or thumb in a particular direction to determine the direction of a magnetic field, force, or other vector quantity.

Thus, the rule does not necessarily involve holding a compass in your right hand.

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Determine if the following statement is true or false. The right-hand rule states that you should always hold a compass in your right hand.

A circular wheel has a radius of 24 cm, a diameter of 48 cm, and a circumference of 3.14159 cm, or 150.8 cm, rounded to the nearest centimeter.

Definition. The circumference of a circle is the length measured around its edge. The diameter of a circle is the distance from the center to the outside. The radius of a circle is the distance between any two points on its edge.

A ring's diameter is equal to half of its diameter, or vice versa, meaning that the diameter of a circle is twice as long as the radius.

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Answer:

1 = The answers are 6, 60, 600, or 6

Explanation:

A 2 kg cue ball is moving at a velocity of 2 m/s when it collides with another 3 kg billiard ball at rest. The total momentum is 4 kg m/ s.

Elaborating the problem:

Before the collision, the momentum of the 2 kg cue ball is:

p₁ = m₁ × v₁

p₁ = 4 kg m/s

The 3 kg billiard ball is at rest, so its momentum is: p₂ = 0 kg m/s

The total momentum of the system before the collision is:

p_total = p₁ + p₂

p_total = 4 kg m/s

The total momentum of the system after the collision is:

p_total = M × [tex]V_{f}[/tex]

p_total = p₁ + p₂

M × [tex]V_{f}[/tex] = p₁ + p₂

5 kg × [tex]V_{f}[/tex] = 4 kg m/s + 0 kg m/s

5 kg * [tex]V_{f}[/tex] = 4 kg m/s

Therefore, [tex]V_{f}[/tex] = 0.8 m/s

So, the total momentum of the system is:

p_total = M × [tex]V_{f}[/tex]

p_total = 5 kg  × 0.8 m/s

p_total = 4 kg m/s

A system's total momentum is the sum of the momentum of all its components. To put it another way, it is the total amount of motion experienced by the system's objects. The total momentum of an isolated system remains constant when there are no external forces acting on it, as stated by the law of conservation of momentum.

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Answer:

Explanation:

Given :-

Solution :-

Frequency of a wave is given by :

where,

On substituting the values we get :

[tex]\dashrightarrow \sf F = \dfrac{240}{0.20} \\ \\ \dashrightarrow \rm F = 1200 \: Hz \\[/tex]

Answer:

The cost of natural gas and hydropower can vary depending on factors such as location, technology used, and market conditions. However, in general:

~ Creating natural gas infrastructure can be more expensive than hydropower infrastructure. This is because natural gas requires drilling wells, building pipelines, and constructing processing facilities. Hydropower, on the other hand, requires building dams and installing turbines, which can also be expensive but typically have a longer lifespan than natural gas infrastructure.

~ Using natural gas can be more expensive than hydropower in terms of fuel costs. Natural gas is a fossil fuel and its price can be volatile, depending on factors such as supply and demand, geopolitical events, and weather. In contrast, hydropower relies on the flow of water, which is a renewable resource and typically has a lower cost.

However, it's worth noting that the cost of natural gas and hydropower also depends on how they are used. For example, natural gas is often used to generate electricity, heat buildings, and power vehicles, while hydropower is mainly used to generate electricity. The cost-effectiveness of each option will depend on the specific context in which they are used.

According to question, If Ann runs 800 metes with sandbags it will take 2 more minutes then Ann's speed for running with sandbags is 160 meters per minute.

A scalar quantity, speed is defined as the size of the change in an object's location over time or the size of the change in the position of an object per unit of time.

Use formula

speed = distance / time

speed without sandbags = 800 meters / 3 min.

speed without sandbags = 266.67 meters per min.

Now, let's find Ann's time to run 800 meters with sandbags:

time with sandbags = 3 minutes + 2 minutes = 5 minutes

speed with sandbags = 800 meters / 5 minutes

speed with sandbags = 160 meters per minute

Therefore, Ann's speed for running with sandbags is 160 meters per minute.

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Buoyancy is the upward force wielded on an object that's wholly or incompletely immersed in a liquid. Also, the buoyancy forces of the two balloons don't have to be the same

Buoyancy doesn't depend on the substance present in the body. thus, both balloons will witness the same lift forces.

balloons float because the air pushes them. But the air does not know what is in the ball.

presses on everything unevenly, so the buoyant force is the same for all balloons of the same size. where ρ is the thickness of the air, g is the acceleration due to graveness, and V is the volume of the balloon.

Buoyancy or buoyancy is the upward force wielded by a liquid opposing the weight of a incompletely or completely submerged object. In a column of liquid, the pressure increases with depth due to the weight of the liquid over.

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The experiment would have the graph of the Boyle's law. The slope is work (N/m). Option C

Boyle's law is a gas law that describes the relationship between the pressure and volume of a gas at a constant temperature. The law states that the pressure of a gas is inversely proportional to its volume, or P ∝ 1/V, where P is the pressure and V is the volume.

The graph of Boyle's law can be used to predict the behavior of gases under different conditions, such as changes in temperature or the addition of other gases.

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Missing parts;

In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is

A.

force

B.

force/m

C.

work

D.

force/m

3

E.

energy/m

Therefore, if MA is less than 1, output velocity would increase while input torque would decrease.

The best performance that can be achieved is the mechanical advantage, which is calculated under the presumption that a machine does not lose power through deflection, friction, and wear. Because of this, it is frequently referred to as the ideal mechanical advantage (IMA).

A machine may not always have a greater mechanical advantage than one. This means that a person must exert more force than the machine can support. Machines like class three levers are an example of this. A class three lever can only move so much when a person presses on it.

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The impedance is 17587 ohm

The current is 0.00085 A

Impedance is a measure of the opposition that an electrical circuit or component offers to the flow of an alternating current (AC) at a specific frequency. It is similar to resistance, which is the opposition offered to the flow of a direct current (DC). However, impedance takes into account not only the resistance but also the capacitance and inductance of the circuit or component.

The Capacitive reactance is;

1/2πfC

= 1/2 * 3.142 * 500 * 0.022 * 10^-6

= 14467 ohms

Then the impedance is;

Z = √(10000)^2 + (14467 )^2

Z = 17587 ohm

The current = Vrms/Z

= 15 V/ 17587 ohm

= 0.00085 A

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Answer:

This level of needs is known as safety needs. Safety needs are the need for security, stability, and protection from physical and emotional harm. These needs include physical safety, financial security, health and well-being, and protection from discrimination and harassment.

Explanation:

The force line which shows the force of gravity that the Earth exerts on the Moon is line A.

The reason Line A is thicker than arrow B is because the Earth exerts a greater force of gravity on the Moon.

According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. Therefore, the gravitational force exerted by the Earth on the moon is equal in magnitude and opposite in direction to the gravitational force exerted by the moon on the Earth.

The force of gravity between two objects depends on their masses and the distance between them, so the force of gravity between the Earth and moon is proportional to their masses and the distance between them. While the moon's gravity does have an impact on the Earth, such as causing ocean tides, it is not a greater force than the Earth's gravity.

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Data set A corresponds to the uniform line of charge and data set B corresponds to the uniformly charged sphere ar e correct . So, option A is the correct answer.

Data set A corresponds to the uniform line of charge because it shows a linear relationship between the electric field strength and the distance from the center of the object. This is characteristic of a uniform line of charge, where the electric field strength is directly proportional to the distance from the center of the line.

Data set B corresponds to the uniformly charged sphere because it shows a non-linear relationship between the electric field strength and the distance from the center of the object. This is characteristic of a uniformly charged sphere, where the electric field strength decreases as the distance from the center of the sphere increases.

Therefore, as per the above explanaions, option A is correct.

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The question is :

Which of the following options correctly identifies which data set corresponds to the uniform line of charge and which one corresponds to the uniformly charged sphere, and provides an explanation for the answer?

A) Data set A corresponds to the uniform line of charge because it shows a linear relationship between the electric field strength and the distance from the center of the object, while data set B corresponds to the uniformly charged sphere because it shows a non-linear relationship between the electric field strength and the distance from the center of the object.

B) Data set A corresponds to the uniformly charged sphere because it shows a non-linear relationship between the electric field strength and the distance from the center of the object, while data set B corresponds to the uniform line of charge because it shows a linear relationship between the electric field strength and the distance from the center of the object.

C) Both data sets correspond to the uniformly charged sphere because they both show a non-linear relationship between the electric field strength and the distance from the center of the object.

D) Both data sets correspond to the uniform line of charge because they both show a linear relationship between the electric field strength and the distance from the center of the object.

If the rate constant, k, for the reaction A + B is 0.25 M-1 s-1 at 75 °C, Which of the following claims is true in light of the rate law, rate = k[A]2[B] The rate law for a reaction is Rate = (1.25 M2s1)[A][B]2.

rate=k[A]m[B]n[C]p…

In which k is the rate constant, which is unique to a certain reaction at a specific temperature, and [A], [B], and [C] indicate the molar concentrations of reactants. M, N, and P are typically positive integer exponents (although it is possible for them to be fractions or negative numbers).  

The rate of a reaction must be tracked experimentally when the reactant concentrations are varied in order to calculate the rate constant k and the exponents m, n, and p. The rate constant k varies with temperature and surface area but is independent of the concentration of A, B, or C.

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For a reaction, a → b, the rate law for the reaction is (0.25) [A] with the rate constant,k is 0.25 m⁻¹ s⁻¹.

The rate of the reaction defines the reactant concentration. It gives the relation between reactant and product. It gives the concentration of the reactant involved in the reaction.

The rate law is directly proportional to the rate constant of the reaction. The rate constant (k) gives the relation between the molar concentration of the reactant and the rate of the reaction.

The rate law is defined as, R= k [A]ᵃ[B]ᵇ, where R represents the rate law, k represents the rate constant, and [A], [B] represents the concentration of the reactant. a,b represents the order of reaction with respect to A  and B.

From the given,

The rate law,

R= k [A]

 = 0.25 [A]

Thus, the rate law of the reaction is 0.25[A].

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The energy is directly proportional to the capacitance of the capacitor, accurately describes the energy stored on a parallel plate capacitor.

What is capacitor?

C) The energy is directly proportional to the capacitance of the capacitor.

The energy stored on a parallel plate capacitor is given by the formula:

E = 1/2 * C * V^2

where E is the energy stored, C is the capacitance of the capacitor, and V is the potential difference across the capacitor.

This formula shows that the energy stored on a parallel plate capacitor is directly proportional to the capacitance of the capacitor. Therefore, option C accurately describes the energy stored on a parallel plate capacitor.

Option A is incorrect because the energy stored is directly proportional to the potential difference across the capacitor, not inversely proportional to the charge stored.

Option B is incorrect because although the energy stored is related to the potential difference across the capacitor, it is not directly proportional to it.

Option F is also incorrect because the energy stored is proportional to the square of the potential difference across the capacitor, not the square of the charge stored.

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The velocity of the car is v = 28.6 m/s.

Solution:

v = p/m

v = 40,000 kg x m/s

1,400 kg

v = 28.6 m/s

Average velocity is a measure of total displacement divided by total time. The total displacement is the distance between the start and endpoints. Since the car moves from point A at both the start and end points the total displacement is zero and the average velocity is also zero.

Velocity is the distance traveled per unit of time, the speed of movement. The speed of a car traveling on a smooth, flat section of a highway without traffic congestion is constant and not zero. Acceleration is the rate of change of velocity. The reason is simple. Velocity is the percentage of time an object moves along a path and Velocity is the speed and direction of an object's movement.

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Well to be honest i probably could answer this if I had the thing to look at to solve it but if not i saw try lucky C. although that doesn't seem like the answer to be honest, either A. or B. seem like reasonable answers to Since D. Does not make sense for this specific question stated, inches for Celsius? Seems a bit off. I say maybe 1. or b. But if your daring choose D. It is really up to you to decide, After all I really do not have anything to base this off of.

Answer:

D . All of the above

i hope you understand

When two materials that are in contact have the same temperature, the materials are said to be in thermal equilibrium.

Thermal equilibrium is a state in which there is no net flow of heat between two objects in contact. In this state, the temperature of the objects does not change over time, as there is no temperature gradient between them. This is a fundamental principle of thermodynamics, and it is the basis for the design and operation of many thermal systems.

The concept of thermal equilibrium is also important in fields such as materials science, engineering, and physics, where it is used to describe the behavior of materials and their interactions with the environment.

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--The complete question is, When two materials that are in contact have the same temperature, the materials are said to be in ______.--

The apparent weight of the object in the lift is 900 N.

When a man is travelling in an elevator, his weight appears to change. His changed weight is known as apparent weight.

Here,

The elevator is ascending. So the apparent weight,

      R = mg + ma

      R = m(g + a)

      R = 80(10 + 1.25) = 80x 11.25

      R = 900 N

Hence,

The apparent weight in the lift is 900 N.

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Answer:

The period of a wave is the time it takes for one complete cycle of the wave to occur. It is given by the formula:

Period = 1 / Frequency

where frequency is the number of cycles per second.

Using this formula, we can calculate the period of the microwaves with a frequency of 30,000,000,000 Hz as:

Period = 1 / 30,000,000,000 Hz

Period = 3.33 x 10^-11 seconds

Therefore, the period of the microwaves with a frequency of 30,000,000,000 Hz is a really small number, which is approximately 3.33 x 10^-11 seconds. The answer is (d) a really small number.

Explanation:

Answer:

x J = (1500 kg)(29 m/s)(y m/s)

Explanation:

x J = (1500 kg)(29 m/s)(y m/s)

To know that a 1500 kg car is moving at 29 m/s is not enough.

The value of x depends on y. You’re missing a number of meters and a quantity of ‘per seconds’ somewhere in your problem statement and you need to find them in order to solve the problem

Answer:

PE = 9.8 J

Explanation:

PE = mgh

PE = (0.5 kg) x (9.8 m/s^2) x (2 m)

PE = 9.8 J

Sergio put a force of 1.2 newtons on the object to perform 30 joules of work by pushing it 25

What is force?

Force is a physical quantity that describes the interaction between two objects, causing a change in their motion. It is measured in units of newtons (N) and is defined as the product of an object's mass and acceleration, as described by Newton's second law of motion.

The force exerted by Sergio on the object can be calculated using the formula:

Work = Force × Distance × cos(theta)

where Work is the work done (in joules), Force is the force applied (in newtons), Distance is the distance moved (in meters), and cos(theta) is the cosine of the angle between the force and the direction of motion (assuming the force is applied parallel to the direction of motion, cos(theta) = 1).

Rearranging the formula, we get:

Force = Work / (Distance × cos(theta))

Substituting the given values, we get:

Force = 30 J / (25 m × cos(0°))

Since cos(0°) = 1, we can simplify the expression to:

Force = 30 J / 25 m

Force = 1.2 N

Therefore, Sergio put a force of 1.2 newtons on the object to perform 30 joules of work by pushing it 25

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Answer:

[tex]\huge\boxed{\sf d = 3590.76\ m}[/tex]

Explanation:

Velocity = v = 11.5 m/s

Time = t = 312.24 s

Displacement = d = ?

d = v × t

d = 11.5 × 312.24

[tex]\rule[225]{225}{2}[/tex]

Answer:

9.1 kg

Explanation:

Potential energy of an object at a height of h meters and mass m is given by
PE = mgh Joules

where

m = mass of the object in kg
h = height in meters

g= gravitational acceleration constant = 9.81 m/s²

Given PE = 1783.6 J

h = 20 m

1783.6 = m x 9.81 x 20

1783.6 = 196.2 m

m = 1783.6 /196.2

= 9.09 kg