a refrigerator is operating in a kitchen the heat is rejected tro the kitchen is 10kw and the heat removed from the refrigerator space is 7kw

Answer:

Actual Mechanical Advantage

Explanation:

AMA=mg/F(applied)

A) The time duration of the chop 5.8 millisecond.

B) The applied average force Fav would be 830 N.

Velocity is a vector quantity that describes the rate of change of an object's position. It is equal to the displacement of an object divided by the time interval over which the displacement occurred. Velocity has both magnitude and direction, and its units are typically meters per second (m/s). The velocity of an object can change over time due to acceleration, and if an object is moving in a circular path, it also has a component of velocity perpendicular to its direction of motion, known as centripetal   velocity.

a) The average speed Vav during the time the hand is in contact with the board is half of the initial speed.

Thus, Vav = (9.5 m/s) /2

= 4.8 m/s

To obtain the time duration t of the chop, substitute 2.8 cm for y and 4.8 m/s for vav

in the equation t=y/ Vav,

t=y/ Vav

=(2.8 cm)/(4.8 m/s)

= (2.8 cm×10⁻² m/1 cm)/(4.8 m/s)

= 5.8×10⁻³ s

= (5.8×10⁻³s) (1 ms/10⁻³s)

= 5.8 ms

Therefore the time duration t of the chop will be 5.8 ms.

b.

To obtain the applied average force Fav, substitute 5.1 N.s for J and 5.8 ms for t in the equation Fav = Jlt,

Fav=Jlt

=(5.1 N.s)/(5.8 ms)

=(5.1 N.s)/(5.8 ms×10⁻³s/1 ms)

= 880 N

From the above observation we conclude that, the applied average force Fav would be 830 N.

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In a downward direction, the magnitude of the acceleration is negative and velocity is zero.

Here,

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High-quality energy in natural processes has a tendency to transform into lower-quality energy, also known as entropy. This transformation follows the Second Law of Thermodynamics, which states that energy tends to disperse and become less concentrated and organized over time.

low-quality energy, as it is used and dispersed throughout the system. This is due to the second law of thermodynamics, which states that energy will naturally flow from a state of higher concentration to a state of lower concentration. Therefore, high-quality energy, such as the energy found in sunlight or fossil fuels, will tend to be transformed into lower-quality energy, such as heat or mechanical work, as it is utilized and moves through natural processes.
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Well spring magma and  groundwater must be interacting beneath the surface which is why they geyser is erupting.

A scientist observes a geyser erupting. The two objects that must be interacting beneath the surface are well spring magma and groundwater.

When a geyser is erupting, it involves the interaction of groundwater and well spring magma. The groundwater seeps into the earth's crust, where it gets heated by the well spring magma. Once the water reaches a certain temperature, it turns into steam and expands, causing pressure to build up. Eventually, this pressure forces the heated water and steam to the surface, resulting in the eruption of the geyser.

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Answer:

Active stretching.

Explanation:

Think about it.

When the runner crosses the finish line, his final speed is 1m/s2.

The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting. The definition of acceleration is the speed at which velocity varies with respect to time. Since acceleration has both a magnitude and a direction,

it is a vector quantity.

We can use the Kinematic relationship:

vf = vi+at

where:

vf = final velocity;

vi = initial velocity;

a = acceleration;

t = time.

With your data:

1.5=6.8+3.5a

rearranging:

3.5a=1.5-6.8

3.5a=-5.3

a=3.5(m/s)/3.5(s)

=1m/s^2

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Answer:

OA. ocean water is a solution

Explanation:

We will have that the picture that shows the highest average kinetic energy is image B.

Answer:

D

Explanation:

The friction force is the weight force times the coefficient of friction. So diving by the coefficient gives you the weight force which is equivalent to the normal force.

The equation that we can used to determine the frictional force using the coefficient of kinetic friction and the normal force is given by the expression : F = u N.

Where N is the normal force by the weight of the body.

Frictional force is a type of force acting on a body to prevents its motion. Hence, the frictional force is always negative. Frictional force acting on an object is making a resistance to the motion of the object.

There are both kinetic frictional force and static frictional force. The coefficient of frictional force is the ratio of the frictional force to the normal force on the object. The normal force on the object is equal to m g that is the force by its own weight.

If u is the coefficient of kinetic friction and N be the normal force acting on the object, then the force of kinetic frictional force F is given by,

F = u N.

Where N = mg.

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Answer: It’s true

Explanation:

This scavenger hunt will take you 3.89 km far from the starting point.

Distance is a scalar quantity that describes the amount of space between two points. It is usually measured in units of length, such as meters, kilometers, or miles. Distance can be calculated as the magnitude of the displacement vector, which is the difference between the initial and final positions of an object.

In physics, distance can be used to describe the length of a physical object, the distance between two points in space, or the length of a path taken by an object. In mathematics, the concept of distance is often used in geometry and can refer to the length of a line segment, the shortest distance between two points, or the distance between two shapes.

Distance = OA = \(\sqrt{AB^2 + OB^2}\)

= \(\sqrt{1.9^2 + 3.4^2}\)

= 3.89 km

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Answer:

HOPE THIS HELPS!!

Explanation:

Velocity is speed as well as distance mentioned.

The car is traveling at a constant speed of 20m/s but it may not be traveling in any particular direction. It would be taking many turns (left and right) or it would be moving in a circular manner.

So,it is at constant speed but not constant velocity.

When the car is stopped by the bumpers, the maximum deflection in each spring can be determined by analyzing the forces acting on the car. Since the car is freely coasting, its kinetic energy is converted into potential energy stored in the springs.

First, we calculate the initial kinetic energy of the car:

Kinetic Energy = (1/2) * mass * velocity^2

= 112,500 lb-ft

Potential Energy = (1/2) * kA * deflectionA^2 + (1/2) * kB * deflectionB^2

To determine the maximum deflection in each spring, we need to find the point where the potential energy is maximized while satisfying the condition that the car is completely stopped. By taking the derivative of the potential energy equation with respect to each deflection and setting them equal to zero, we can solve for the maximum deflections. However, since the equations involve second-order terms, a detailed calculation is required to find the precise values.

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its either true or false not sure which one i just know it one of those 2

Answer:

A ball moving through the air.

Explanation:

The ball has momentum which is a form of kinetic energy.

I don't know if that is correct, but I hope it helps!!!!

Answer:

Distance = 10 kilometers.

Explanation:

Given the following data;

Speed = 5km/h

Time = 2 hours

To find the distance traveled;

Distance = speed * time

Distance = 5 * 2

Distance = 10 kilometers

Therefore, the distance travelled by the car is 10 kilometers.

Assuming that the small shell is a conductor and in electrostatic equilibrium, the total charge on the inner surface of the small shell will be zero.

In electrostatic equilibrium, charges distribute themselves on the outer surface of a conductor, and the electric field inside a conductor is zero.

As a result, any charges present on the inner surface of the small shell would experience a repulsive force and redistribute themselves until the electric field becomes zero inside the conductor.

Therefore, with the assumption that the small shell is a conductor in electrostatic equilibrium, the total charge on its inner surface would be zero.

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Given,

The force applied by each person who is pushing the object, F=50 N

The frictional force, f=20 N

The frictional force is the force that opposes the motion of the object. As the people are pushing the object to the right, the frictional force will be directed to the left. And as the force with which people are pushing is greater than the frictional force, the net force will also be directed towards the right.

The net force is given by,

On substituting the known values,

Therefore the net force on the object is 80 N to the right.

Thus the correct answer is option 4.

freezing

During freezing, the temperature of a substance remains constant while the particles in the liquid form a crystalline solid. Because particles in a liquid have more energy than particles in a solid, energy is released during freezing. This energy is released into the surroundings.

Answer:

NASA's Artemis program aims to land another man and the first woman on the moon by 2024 and eventually establish sustainable space travel by 2028. The Artemis program is NASA's stepping stone to their ultimate goal of landing on Mars.

Explanation:

1. The period of the waves is 2.2924s.

2. The frequency of the wave is 0.4362 Hz.

Given :

t=0.5731 s.

The time taken to travel this would be

t = T/4

T = \(0.5731*4\)

T = 2.2924

Frequency is given by,

f = 1/T

f = \(1/2.2924\)

f = 0.4362 Hz.

What is the time period in physics?

The time taken for one complete oscillation to occur is called the Time Period. It is denoted by T. Its unit is seconds.

What is the frequency?

Frequency is the number of vibrations or the number of occurrences of a repeating event per unit of time. The frequency is measured in terms of Hertz.

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Explanation:

a) i) Calculation of the friction force:

The friction force can be determined using the equation:

friction force = coefficient of friction * normal force

The normal force is equal to the weight of the object, which can be calculated as:

normal force = mass * gravitational acceleration

where the gravitational acceleration is approximately 9.8 m/s².

normal force = 75 kg * 9.8 m/s² = 735 N

friction force = 0.4 * 735 N = 294 N

ii) Calculation of the acceleration of the body:

Now, we can calculate the acceleration using Newton's second law:

net force = mass * acceleration

Since the applied force and the friction force act in opposite directions, the net force can be calculated as:

net force = applied force - friction force

net force = 300 N - 294 N = 6 N

mass = 75 kg

6 N = 75 kg * acceleration

acceleration = 6 N / 75 kg = 0.08 m/s²

b) Explanation:

In part (a), we calculated the friction force to be 294 N and the acceleration of the body to be 0.08 m/s². The positive acceleration indicates that the body is moving in the direction of the applied force.

The friction force opposes the motion of the body and acts in the opposite direction to the applied force. In this case, the applied force of 300 N is greater than the friction force of 294 N. As a result, the net force acting on the body is 6 N in the direction of the applied force.

The small net force of 6 N, compared to the body's mass of 75 kg, results in a relatively low acceleration of 0.08 m/s². This indicates that the body will accelerate slowly in the direction of the applied force due to the presence of friction.

Overall, the friction force and the resulting acceleration of the body are determined by the coefficient of friction (μ) and the mass of the object. In this case, the body experiences a relatively high friction force, leading to a small acceleration.

The man exerts a force on the paddle to move the paddle, and he is not pushing the water directly.

The boat moves forward when the paddle exerts a force on the water, and the water exerts the same amount of reaction force on the paddle.

Due to the reaction force on the paddle by the water, the boat moves forward.

The boatman applies a force pushing the water backward (the action).

The water exerts an equal force along the pole in the opposite direction (this is the reaction).The horizontal component of this reaction is a force that makes the boat move forward into the water.

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--Incomplete Question, The complete Question is- what causes the boat in (figure 1) to move forward? what causes the boat in to move forward? the motion of the water itself. the force the man exerts on the paddle. the force the water exerts on the paddle. the force the paddle exerts on the water.--

Answer:

6.32s

Explanation:

Given parameters:

Length of track and distance covered  = 200m

Acceleration  = 10m/s²

Unknown:

Time taken to cover the track  = ?

Solution:

To solve this problem, we apply one of the motion equations as shown below:

       S  = ut + \(\frac{1}{2}\) at²  

S is the distance covered

t is the time taken

a the acceleration

u is the initial velocity

The initial velocity of Superman is 0;

 So;

     S  =  \(\frac{1}{2}\) at²  

        200  =  \(\frac{1}{2}\) x 10 x t²  

          200  = 5t²  

            t²  = 40

            t  = 6.32s

Explanation:

list in order with the smallest molecules at the top and largest molecules at the bottom:

1.Oxygen

2.Water

3.Carbon dioxide

4.amino acid

5.Glucose

6. Starch

7. Protein

The molecules can be arranged as follows with the smallest at the top is oxygen, water, carbon dioxide, amino acid, glucose, starch, protein.

The given molecules;

starch, water, glucose, carbon dioxide, protein, amino acid, oxygen

The molecular weight of the given compounds is listed as follows;

water -------- 18 g/mol

glucose -------  180.2 g/mol

starch (2 or more glucose) ------ 360 g/mol

carbon dioxide ------ 44 g/mol

protein -------- 20,000 g/mol

amino acid (glycine) ----- 75 g/mol

oxygen -------- 16 g/mol

Thus, the molecules can be arranged as follows with the smallest at the top;

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Answer:

The mass of the block of material is 3 x 10³⁷ g/mol

The charge of the material is  4.8 x 10⁸ C

Explanation:

Given;

number of protons of the material, P = 3 x 10²⁷

number of neutrons in the material, N = 3 x 10³⁷

number of electrons in the material, E =  3 x 10²⁷

The mass of the block of material is calculated as follows;

M = P + N

M =  3 x 10²⁷ +  3 x 10³⁷

M =  3 x 10³⁷ g/mol

The charge of the material is calculated as follows;

charge of 1 electron = 1.6 x 10⁻¹⁹ C

charge of  3 x 10²⁷ electrons =  3 x 10²⁷ electrons   x   1.6 x 10⁻¹⁹ C

                                                = 4.8 x 10⁸ C

The power wasted in heating the cables of total resistance 9.0 Ω  is 74365290000 W.

Electric power is the rate at which work is done or energy is transformed into an electrical circuit.

To calculate the electric power wasted in heating the wire, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the power wasted is 74365290000 W.

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When a rope of length L and mass m is suspended from the ceiling, the tension in the rope at position y can be found using the following expression:

T(y) = mg + λy where g is the acceleration due to gravity, λ is the linear mass density of the rope, and y is the distance measured upward from the free end of the rope.

Here's how to derive the expression: Let's consider an element of length dy of the rope at a distance y from the free end of the rope. The weight of the element is dm = λdy and acts downward. The tension in the rope on the element can be resolved into two components - one acting downward and another acting upward. Let T be the tension in the rope at point y and T + dT be the tension in the rope at point (y + dy).The upward component of tension on the element is given by Tsinθ, where θ is the angle between the element and the vertical. As the rope is assumed to be in equilibrium, the horizontal components of tension balance each other and the net vertical force on the element is zero. Therefore, we have,

Tsinθ - dm g = 0 ⇒ Tsinθ = dm g ⇒ Tsinθ = λdyg

The angle θ can be found using the equation tanθ = dy/dx ≈ dy/dy = 1. Therefore, sinθ = dy/√(dy²+dx²) ≈ dy and we have,T dy = λdyg ⇒ T = λgThis expression gives the tension in the rope at the free end of the rope. The tension in the rope at position y, measured upward from the free end of the rope is given by,T(y) = mg + λy

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Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.