Approximately 80% of the energy used for active transport is devoted to the reabsorption of __________.

Answer:

5m

Explanation:

The acceleration of the swimmer is 3.57 meters per second squared, calculated by dividing the force (250 N) by the swimmer's mass (70 kg) using Newton's second law.

To calculate the acceleration of the 70-kg swimmer who pushes off the pool wall with a force of 250 N, we use Newton's second law of motion, which is stated as F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. To find the acceleration, we rearrange the formula to a = F / m.

Therefore, the acceleration a of the swimmer can be calculated by dividing the force by the mass of the swimmer:

a = F / m = 250 N / 70 kg = 3.57 m/s2

This means the swimmer's acceleration is 3.57 meters per second squared.

Answer:

c. the acceleration depends directly on the mass of the objects

Explanation:

When a ball is thrown straight up, its velocity changes from positive to negative, while its acceleration changes from negative to zero to positive.

When a ball is thrown straight up into the air, the velocity of the ball changes. Initially, the ball has a positive velocity, representing upward motion. As it moves against the force of gravity, the velocity decreases until it reaches zero at the highest point of its trajectory. Then, as the ball falls back down, the velocity becomes negative, increasing in magnitude as it approaches the ground.

The acceleration of the ball also changes during its motion. In the upward direction, the acceleration is negative, as it opposes the ball's initial velocity. At the highest point, the acceleration is zero, as the ball momentarily stops moving vertically. On the downward path, the acceleration is positive, as it adds to the ball's velocity, increasing its speed as it falls back down.

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Positively charged ions are surrounded by freely moving electrons in metallic bonding.

Minerals containing transition metals exhibit metallic bonding frequently. Minerals with metallic bonding include gold, silver, and copper.

Metallically bound compounds are efficient heat and electricity conductors because valence electrons can travel freely throughout the structure.

When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created.

Positively charged ions are encircled by an electron cloud during metallic bonding. The nucleus of an atom is not strongly bound to outer-level electrons. Instead, the electrons freely move among many positively charged ions.

Thus, The positively charged ions are surrounded by freely moving electrons in metallic bonding.

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Answer: fly ash

Oil well, biomass and landfill are the sources of the natural gas. But fly ash is not the source of natural gas because it is formed by the combustion of the coal during the electricity generation process.

Oil well is a boring inside the earth crust which is digg open to obtain crude oil such as petroleum but the natural gas which sometimes lies above the liquid petroleum also collected.

Biomass is the reservoir of organic matter it is main composition of all living organisms. The decaying matter is a form of biomass. This biomass releases natural gason decomposition.

Landfill is the area where the biodegradable waste is disposed off. The action of biological agents such as bacteria feed upon these wastes and release natural gas.

The weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons, as we know that the value of the acceleration due to the gravity of the earth would be 1.47 Newtons .

It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another .

As given in the problem we have to find out how much a 0.15 kg baseball weighs on earth .

The value of the acceleration due to gravity on the earth = 9.8 m / s²

The weight of the baseball on the earth = 0.15 × 9.8

                                                                   = 1.47 Newtons

Thus, the weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons .

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The x-component of the total momentum of Bryce's mice is approximately -0.01299 kg⋅m/s, and the y-component is approximately -0.12702 kg⋅m/s.

Calculate the momentum of each mouse:

The momentum (p) of an object is given by the product of its mass (m) and velocity (v):

For the first mouse:

p1 = (0.0227 kg) × (0.517 m/s) = 0.0117439 kg⋅m/s in the x-direction, and

p1 = (0.0227 kg) × (-0.493 m/s) = -0.0112261 kg⋅m/s in the y-direction.

Sum up the momenta for each direction:

For the x-component:

px = p1x + p2x + p3x + p4x

px = (0.0117439 kg⋅m/s) + (-0.0121411 kg⋅m/s) + (0.0077545 kg⋅m/s) + (-0.0203475 kg⋅m/s)

px ≈ -0.01299 kg⋅m/s

Calculate the final values:

For the y-component:

py = p1y + p2y + p3y + p4y

py = (-0.0112261 kg⋅m/s) + (-0.0182619 kg⋅m/s) + (0.0102783 kg⋅m/s) + (0.022034 kg⋅m/s)

py ≈ -0.12702 kg⋅m/s

Answer:

A) avoid lifting above shoulder.

Explanation:

 the correct option will be option A) avoid lifting above shoulder.

So,

For safe lifting one should not lift above shoulder level.

Safe lifting is one of the most important practice which should be encountered. Because of this many workers have suffer from injuries, permanent deformation of  the  body of the worker.

So, for practicing safe lifting is very important.

The tension in each of the two wires supporting the street lamp can be calculated using trigonometry. The tension in each wire will be the same and can be found using the weight of the street lamp and the angle between the wires. The tension in each wire is approximately 164.63 N.

The tension in each of the two wires supporting the street lamp can be calculated using trigonometry. Since the street lamp is supported equally by the two wires, the tension in each wire will be the same. To find the tension, we can use the relationship between the weight of the street lamp and the vertical component of the tension. The vertical component of the tension can be found by using the angle between the wires and the weight of the street lamp.

Given: Weight of the street lamp (W) = 158 N, Angle between the wires (θ) = 104°

Using trigonometry, we can find the vertical component of the tension (T) using the equation:

T = W / sin(θ)

Substituting the given values, we get:

T = 158 N / sin(104°)

T ≈ 164.63 N

Therefore, the tension in each of the two wires supporting the street lamp is approximately 164.63 N.

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An atom that gains or loses electrons becomes an ion.

When an atom gains or loses a valence electron, it becomes a charged particle called an ion. If an atom loses one or more electrons, it becomes a cation, which has a positive charge because it has fewer electrons than protons. Conversely, when an atom gains electrons, it becomes an anion with a negative charge, having more electrons than protons. For example, a neutral chlorine atom becomes a chloride ion with a -1 charge upon gaining an electron.

Ions are highly reactive and their formation is a process known as ionization. They play a crucial role in various chemical reactions, including the formation of ionic bonds where one atom becomes a cation and another becomes an anion.

The Law of Conservation of Energy states:

B: Energy can be created

D: Energy can be destroyed

F: The total amount of energy will stay the same

I: Energy can be transmitted from one form to another

The law of conservation of energy states that energy cannot be created nor destroyed but can be transformed from one form to another.

This means that the total energy of an isolated system is the same no matter the internal changes taking place within the system.

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The vertical height attained by the basketball player during a hang time of 1.11 seconds is approximately 1.51 meters.

To determine the vertical height attained by a basketball player with a hang time of 1.11 seconds, we can use the following physics equations related to free fall motion.

Step-by-Step Calculation

First, we divide the total hang time by 2 to find the time taken to reach the maximum height:

Time to reach maximum height: 1.11 s / 2 = 0.555 s

Use the kinematic equation for vertical motion:

h = v_i x t + 0.5 x a x [tex]t^2[/tex]

Since the initial vertical velocity (v_i) at the peak is 0, the equation simplifies to:

h = 0.5 x g x [tex]t^2[/tex]

Substitute the known values:

h = 0.5 x[tex]9.8 m/s^2 \times (0.555 s)^2[/tex]

Calculate the height:

h ≈ 1.51 meters

Thus, the basketball player will attain a vertical height of approximately 1.51 meters during their hang time of 1.11 seconds.

Answer:

-2065

Explanation:

155 g of ammonia (NH3) to moles:

155 g / 17 g/mol = 9.118

Given: The ratio includes 4 moles of ammonia and -906 kJ of energy.

Therefore, to find the heat, multiply the moles of ammonia by ratio of energy to moles in the formula.

[tex]9.118*\frac{-906}{4} =-2065.2[/tex]

OR

[tex]-2.06*10x^{3}[/tex]

To calculate the heat associated with the complete reaction of 155 g of NH3, convert the mass of NH3 to moles, use stoichiometric coefficients to calculate the number of moles of heat produced, and calculate the heat associated with the reaction.

To calculate the heat associated with the complete reaction of 155 g of NH3, we need to first convert the mass of NH3 to moles:

Molar mass of NH3 (1 mol of N + 3 mol of H) = 14.01 g/mol + 1.01 g/mol * 3 = 17.03 g/mol

Number of moles of NH3 = 155 g / 17.03 g/mol = 9.11 mol

Next, we use the stoichiometric coefficients in the balanced equation to calculate the number of moles of heat produced:

From the balanced equation, we see that 4 moles of NH3 produce 6 moles of H2O and release -906 kJ of heat.

So, 9.11 moles of NH3 produce (9.11 mol * 6 mol H2O / 4 mol NH3) = 13.665 mol H2O.

Finally, we calculate the heat associated with the complete reaction of 155 g of NH3:

Heat = (13.665 mol H2O * -906 kJ / 6 mol H2O) = -2048.05 kJ.

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Answer : The power usage of the headlamp is 45 watts.

Explanation :

It is given that,

Katie wants to buy the right headlamp bulb as a spare for her motorcycle.

The voltage of the motorcycle, V = 12 V

The current flowing through the headlight is measured at 3.75 A

The power of headlamp is given by the product of the voltage and the current flowing in the headlamp.

Mathematically, it is written as :

[tex]P=VI[/tex]

[tex]P=12\ V\times 3.75\ A[/tex]

[tex]P=45\ Watts[/tex]

The power usage of the headlamp is 45 Watts.

The final speed of a car that accelerated from an initial speed of 6.5 m/s at a rate of 0.92 m/s² for 3.6 seconds would be 9.812 m/s.

This question deals with the concept of linear motion and specifically, the calculation of final speed given initial speed, acceleration, and time. The equation we would use in this case is Final Speed = Initial Speed + (Acceleration * Time), which is a standard formula in physics for predicting the final speed of an object given its initial conditions and the forces acting upon it.

Let's apply this equation to your specific problem. The initial speed of the car is 6.5 m/s. It accelerates at a rate of 0.92 m/s² for exactly 3.6 seconds. Therefore, substituting values into our equation, the final speed of the car would be calculated as follows: Final Speed = 6.5 m/s + (0.92 m/s² * 3.6 s) = 9.812 m/s.

This means that the final speed of the car, after accelerating for 3.6 seconds, should be 9.812 m/s assuming a constant acceleration during this time period.

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Position, velocity, displacement, acceleration, and average velocity are vector quantities and Speed and distance are scalar quantities.

A vector is a quantity with both magnitude and direction in physics. It is often represented by an arrow with the same direction as the amount and a length proportional to the magnitude of the quantity. A vector lacks position but does have magnitude and direction. A vector is therefore unaffected by displacement parallel to itself as long as its length is unaltered.

Scalar, a physical quantity whose magnitude is a perfect description of it. Scalars include concepts such as volume, density, speed, energy, mass, and time. Other quantities are referred to as vectors because they have both magnitude and direction, like force and velocity.

Real numbers, typically positive but not always, are used to describe scalars. When a particle moves in the opposite direction from how a force is acting, as happens when frictional force slows down a moving body, for instance, the work done on the particle by the force is a negative number.

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Answer:

the answer is heat. pleas give me a thanks if the answer is right

you can press now lol

If you divide velocity meters/second by time (seconds )then we would get the acceleration in meters/second², because the rate of change in the velocity is known as the acceleration of the object.

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem If you divide velocity meters/second by time (seconds )then we have to find the result,

acceleration= meters/second/ seconds

                    =meters/second²

Thus, the object's acceleration is the rate at which its velocity changes. We may determine acceleration in meters/second2 by dividing the object's meters/second velocity by the passage of time.

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