Paul swims 7.5 kilometers in 1.5 hours. What was his average speed?

Answer:

materials: solid dissolved in a liquid

independent variable: temperature

Explanation:

I got it right

When a block slides across a rough, horizontal tabletop and comes to rest, there is an increase in the block-tabletop system’s Option 4). internal (thermal) energy.

The process of the block coming to rest on the tabletop causes the surfaces to rub against each other, resulting in friction and heat production.

The heat produced due to the friction causes the internal (thermal) energy of the block-tabletop system to increase.

Internal (thermal) energy is the total kinetic energy of the particles that make up a substance.

It includes the kinetic energy of the particles due to their movement and the potential energy of the particles due to their interactions with one another.

Friction produces heat, which increases the internal energy of the block-tabletop system.

Internal energy is often not conserved, meaning it can increase or decrease due to energy transfers into or out of a system.

In this case, the block-tabletop system is losing kinetic energy as the block comes to rest, but the internal energy is increasing due to the friction and heat production.

Therefore, the correct answer to the given question is option (4) internal (thermal) energy.

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Based on the Latent heat of vaporization of iron, the choice that calculates the amount of energy needed to change the state of iron during intervals D-E is 6272.0 KJ.

The amount of heat needed to transform a unit mass of a substance from a liquid to a gas at that solid's boiling point is known as the latent heat of vaporization.

The following is the formula to determine a substance's latent heat of vaporization:

L = q/m, the latent heat of vaporization where;

Δq is the heat change \sm is the mass of the liquid

The interval D to E is vaporization

Heat required = 349.6 kJ/mol * 112 g / 56g/mol

Heat required = 699.2 kJ

Therefore, Based on the Latent heat of vaporization of iron, the choice that calculates the amount of energy needed to change the state of iron during intervals D-E is 6272.0 KJ.

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Answer: by giving special shapes called streamlined shape to the objects

Explanation:

Answer:

To find the specific gravity of the fluid, we need to compare its density to that of water.

First, we need to find the mass of the water in the bottle:

Mass of water = Mass of filled bottle - Mass of empty bottle

Mass of water = 84.70 g - 10.00 g

Mass of water = 74.70 g

Next, we can calculate the volume of water in the bottle using the density of water, which is 1 g/mL:

Volume of water = Mass of water / Density of water

Volume of water = 74.70 g / 1 g/mL

Volume of water = 74.70 mL

Now we can use the mass of the bottle when it is filled with the other fluid to find the mass of the fluid:

Mass of fluid = Mass of filled bottle - Mass of water - Mass of empty bottle

Mass of fluid = 70.00 g - 74.70 g - 10.00 g

Mass of fluid = -14.70 g

This result is negative, which means that the mass of the fluid is less than the mass of the water. This could be due to a variety of factors, such as air bubbles trapped in the fluid or an error in the measurements.

Assuming that the mass of the fluid should have been greater than the mass of the water, we can still calculate the specific gravity using the volume of water we calculated earlier:

Density of fluid = Mass of fluid / Volume of water

Density of fluid = (70.00 g - 10.00 g - 74.70 g) / 74.70 mL

Density of fluid = -14.70 g / 74.70 mL

Density of fluid = -0.196 g/mL

Again, this result is negative and therefore not physically meaningful. It is possible that there was an error in the measurements or that the assumption about the mass of the fluid being greater than the mass of the water was incorrect. Without additional information, we cannot calculate the specific gravity of the fluid.

Explanation:

Answer:

Mental and physical health is fundamentally linked. There are multiple associations between mental health and chronic physical conditions that significantly impact people’s quality of life, demands on health care and other publicly funded services, and generate consequences to society.  The World Health Organization (WHO) defines: health as a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.   The WHO states that “there is no health without mental health.”

Nowhere is the relationship between mental and physical health more evident than in the area of chronic conditions. The associations between mental and physical health are:

1. Poor mental health is a risk factor for chronic physical conditions.

2. People with serious mental health conditions are at high risk of experiencing chronic physical conditions.

3. People with chronic physical conditions are at risk of developing poor mental health.

The social determinants of health impact both chronic physical conditions and mental health. Key aspects of prevention include increasing physical activity, access to nutritious foods, ensuring adequate income and fostering social inclusion and social support. This creates opportunities to enhance protective factors and reduce risk factors related to aspects of mental and physical health.

Understanding the links between mind and body is the first step in developing strategies to reduce the incidence of co-existing conditions and support those already living with mental illnesses and chronic physical conditions.

Explanation:

Hope this helps

Brainliness please and thank you

The resistance is 14×10⁵ ±5%

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Answer:

The first graph

Explanation:

Graph A shows acceleration.

The mass of the spaceship would change the minimum velocity needed to make it to the moon. The greater the mass of the spaceship, the higher the minimum velocity required to overcome the gravitational force .

The minimum velocity needed to make it to the moon can be affected by the following factor: - The mass of the Earth An increase in Earth's mass would result in a stronger gravitational force, requiring a higher minimum velocity for the spaceship to escape Earth's gravity and reach the moon. The radius of the Earth and the mass of the spaceship do not directly influence the minimum velocity needed for this journey.

This relates to the method by which we determine gravitational pull. The mass of the thing in question is precisely proportional to this value, to put it briefly. The force of gravity will increase with item mass. The semi-truck will therefore have the strongest gravitational attraction because it is the largest.

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Answer:

Only at point a

Explanation:

If the velocity is greater than zero, than the object must be moving.

The units for specific heat can either be joules per gram per degree (J/goC) or calories per gram per degree (cal/goC). Option 3 and 4 are correct.

Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree

Units are the measuring standards for the measurement of a particular quantity. The units for specific heat can either be joules per gram per degree (J/g⁰C) or calories per gram per degree (cal/g⁰C). So two options are correct.

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The Complete Question:

How do I get one solution of 7x + 69 = 1 ?

Value of x in 7x + 69 = 1 is ( - 9.71 ).

Since the degree of variable is 1, the equation will have only one solution.

The degree of variable is defined at the value of power of the variable.

Using Algebra Equation,

= 7x + 69 = 1

= 7x = 1 - 69

= 7x = ( - 68)

= x = ( - 68) / 7

= x = ( - 9.71 )

Thus, the value of x in 7x + 69 = 1 is ( - 9.71 ) and this is the only solution to single degree algebraic equation.

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Hi there!

We can go about this problem using a summation of torques.

In order to ensure the rod is in equilibrium, we must satisfy the condition:

Στ = 0

Since the rod is "very light", we can disregard its mass.

The equation for torque is:

τ = rFsinθ

In this instance, the torques are the weights of the objects and their distance from the pivot.

As the rod is 40 cm, the pivot is at 20 cm. Also, the torques must sum up to 0, so:

0 = rF1 - rF2

r1F1 = r2F2

0.20(50) = r2(200)

Solve:

10 = r2(200)

r2 = 0.05 m = 5 cm

The 200N weight must be put at a distance of 5 cm from the OTHER SIDE of the pivot in order to balance the rod.

The correct choice is B. drill holes near the axis and put the material near the rim to increase the rotational inertia of the solid disk about its axis without changing its mass.

To increase the rotational inertia of a solid disk about its axis without changing its mass, you need to distribute the mass of the disk in a way that increases the mass concentration away from the axis of rotation. This can be achieved by redistributing the mass by drilling holes and moving the material.

Among the given options, the correct choice would be B. drill holes near the axis and put the material near the rim. By removing material from near the axis and placing it near the rim, you effectively increase the mass distribution away from the axis, which increases the rotational inertia.

Option A, drilling holes near the rim and putting the material near the axis, would reduce the mass distribution away from the axis, resulting in a decrease in the rotational inertia.

Option C, drilling holes at points on a circle near the rim and putting the material at points between the holes, would distribute the material evenly along the rim and not significantly affect the rotational inertia.

Option D, drilling holes at points on a circle near the axis and putting the material at points between the holes, would also not significantly affect the rotational inertia since the material would still be concentrated near the axis.

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The electric force between the droplets, and the horizontal acceleration this force produce on the droplets are: 5.84*10^-7 N and 0.32 m/s² respectively

In physics the electric force is the force that attracts or repels two charges (q) separated at a distance called (r), this is expressed in the international system of units in Newton.

To solve this exercise the electric force formulas and the procedures we will use are:

Where:

Given Info:

Applying the electric force formula we have:

F = (k * q1 * q2)/r²

F = [(9 *10^9 N*m²/C² * (2.9*10^-11 C) * (2.9*10^-11 C)]/ (3.6*10^-3 m)²

F = 7.569*10^-12 N*m² /1.296*10^-5 m²

F = 5.84*10^-7 N

Applying the force formula and clearing the acceleration, we get:

a= F/m

a= 5.84*10^-7 N/ 1.8*10^-6 kg

a= 0.32 m/s²

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The angular displacement can be calculated as: Angular Displacement = 30 degrees + (ω * 1.3 seconds).

To calculate the angular displacement experienced by the diver during a double twist, we need to consider the initial angle and the time taken to complete the maneuver.

Given that half of the diver's body was inclined forward at a 30-degree angle, it implies an initial angular displacement of 30 degrees. The time taken for the maneuver is 1.3 seconds.

To determine the angular displacement, we can use the formula:

Angular Displacement = (Initial Angular Displacement) + (Angular Velocity * Time)

Since the diver performs a double twist, the angular velocity can be assumed to be constant throughout the maneuver. Let's denote it as ω.

Therefore, the angular displacement can be calculated as:

Angular Displacement = 30 degrees + (ω * 1.3 seconds)

The specific value of ω would depend on the diver's rotational speed during the double twist. With additional information on the angular velocity, we could provide a more precise calculation of the angular displacement experienced by the diver.

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Answer:

DDDDDDDDDDDDDDDDDDDDDDDDDDD

Answer:

The answer is

Explanation:

Using Boyle's law to find the final pressure

That's

\(P_1V_1 = P_2V_2\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final pressure

\(P_2 = \frac{P_1V_1}{V_2} \)

From the question

P1 = 115 kPa

V1 = 480 mL

V2 = 650 ml

So we have

\(P_2 = \frac{115000 \times 480}{650} = \frac{55200000}{650} \\ = 84923.076923...\)

We have the final answer as

Hope this helps you

The electricity would last for about 3,875 days or 10.6 years if used by a city with a population of 100,000 and a per capita power requirement of 1 kWh.

(a) To calculate the total electrical energy produced, we need to find the volume of water in the reservoir and multiply it by the average head and the efficiency of the hydroelectric facility.

Volume of water = width * length * depth

= 2 km * 10 km * 50 m

= 100,000,000 m^3

Total electrical energy = Volume of water * average head * efficiency

= 100,000,000 m^3 * 100 m * 0.93

= 9,300,000,000 kWh

(b) The value of the electricity generated can be found by multiplying the total electrical energy by the rate of $0.10 per kWh.

Value of electricity = Total electrical energy * rate

= 9,300,000,000 kWh * $0.10/kWh

= $930,000,000

(c) If the electricity is used by a city with a population of 100,000 and each person has a per capita power requirement of 1 kWh, we can calculate the duration the electricity would last.

Total power requirement = population * per capita power requirement

= 100,000 * 1 kWh

= 100,000 kWh

Duration = Total electrical energy / Total power requirement

= 9,300,000,000 kWh / 100,000 kWh

= 93,000 hours or approximately 3,875 days

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Answer:ME= 1\2mv^2 + mgh

Explanation: I hope this helped.

The correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R. Negative sign appears as gravitational force is attractive force.

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases.

If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy. It is capable of performing more work when raised.

Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has more potential energy as they become further apart.

Potential energy of a system of particles can be represented as summation of individual's  potential energy. Hence, the correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R.

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Since both heat and work can be measured and quantified, this is the same as saying that any change in the energy of a system must result in a corresponding change in the energy of the surroundings outside the system. In other words, energy cannot be created or destroyed.

Answer:

Explanation:

Given:  

c₁ = 2100 J / (kg·°C)

c₂ = 4200 J / (kg·°C)

λ₁ = 3.4·10⁵ J / kg -

t₁ = -24.2°C

t₀ = 0°C

t₂ = 78.3°C

t = 40.0°C

m₂ = 0.350 kg

___________

m₁ - ?

Ice is heated to 0°C:

Q₁ = c₁·m₁·(t₀ - t₁) = 2100·m₁·(0 - (-24.2)) = 50 820·m₁  J

The ice is melting:

Q₂ = λ·m₁ = 340 000·m₁  J

Cold water is heated:

Q₃ = c₂·m₁·(t - t₀)  = 4200·(40.0 - 0)·m₁ = 168 000 J

Hot water is cooling down:

Q₄ = c₂·m₂·(t₂ - t) = 4200·0,350·(78.3 - 40.0) = 56 300 J

Thermal badance equation:

Q₁ + Q₂ + Q₃ = Q₄

m₁·(50820 + 340 000 + 168 000) = 56 300

m₁·(3 620 000) = 56 300

Mass of ice:

m₁ = 56 300 / 3 620 000 ≈  0,016 kg  or  16 g

mass=30 force=50

(a) 50÷30

Answer:

Photosynthesis is the process of using water, carbon dioxide and sunlight to produce sugar. The process of photosynthesis requires specialized cellular structures called chloroplasts to capture energy from the Sun and converted into chemical energy.

Explanation:

Answer:

Explanation:

Since the forces are only in the x-direction, you could just add the two forces. The West is to the left, so it would be -25N with the negative sign indicating direction. The East is to the right, so that would be +50N.

50 + (-25) = 25N to the right or the positive i-hat direction

Answer:

The total applied force on the trolley is 5 N toward the North.

Explanation:

yes

To calculate show window branch-circuit loads using one of the two methods, you can multiply each receptacle by 180 volt-amperes.

Branch circuit loads in an electrical distribution system are the electrical equipment and appliances linked to a particular branch circuit. A branch circuit is a conduit through which electricity is sent from the main electrical panel to certain outlets, lights or pieces of equipment inside a building or other structure. The total amount of electrical load that each branch circuit can safely take is determined by its maximum capacity, or the circuit's ampere rating. Lighting fixtures, outlets, kitchen appliances, HVAC systems, and electronic gadgets are just a few examples of the many electrical components that might be branch circuit loads. The safe and effective operation of electrical systems in residential, commercial, and industrial settings depends on the proper sizing and distribution of branch circuits.

1. Identify the number of receptacles in the circuit.
2. Multiply the number of receptacles by 180 volt-amperes.
3. The result will give you the total load in volt-amperes for the show window branch-circuit.

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The amount of force required to stop an object, based on the forces of inertia and momentum, varies according to speed, weight, and the distance between impact and stop.

Inertia is the tendency of an object to remain in motion unless acted upon by an outside force, while momentum is the product of an object's mass and velocity. The amount of force required to stop an object is proportional to its mass, velocity, and the distance it needs to travel before it comes to a stop. The greater the mass, velocity, and distance, the more force is required to stop the object.

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