if a diver who is underwater shines a flashlight upward, toward the surface, at an angle of 28 degrees from the normal, at what angle does the light emerge from the water?

5.1.1. The force that the wall will exerts on the car during this time will be 360000N.

5.1.2. The force the wall will now exert will be 120000N.

What is force?
Force is a physical influence that is capable of changing the motion of an object or altering its shape and structure. It is a vector quantity that is measured in newtons and is often described as a push or pull. Force can be caused by many different sources such as gravity, friction, and electromagnetism. Force can also be created through the application of energy, such as when a person pushes an object or when an object is acted upon by a magnetic field.

5.1.1. The force that the wall will exert on the car during the 0.25 seconds is calculated using the equation F=m*a, where F is force, m is mass and a is acceleration.

F = 900 kg * (100 km/h / 0.25 s)

F = 360000 N

5.1.2. The force that the wall will exert on the car during the 0.75 seconds is calculated using the same equation.

F = 900 kg * (100 km/h / 0.75 s)

F = 120000 N

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Answer:

Speed of the body​ = 5.1652 m/s

Explanation:

Given:

Mass M = 17 kg

Length of string = 3.4 m

Tension in the string = 300N

Find:

Speed of the body​

Computation:

T - mg = mv² / R...              [R = L]

So,

T - mg = mv² / L

300 - 17[9.8] = [17][v]² / [3.4]

133.4 = [17][v]² / [3.4]

v² = 26.68

Speed of the body​ = 5.1652 m/s

Answer: d. availability of places to play

Explanation: I think that it’s d because availability of space to do your physical activity is important. Availabilty of places to play is an environmental factor due to where you decide to play.

Explanation:

the forces among the four particles in the helium nucleus atom are strong, weak, electromagnetic and gravity

The provision of top-notch healthcare is a duty of the government to safeguard and develop societal interests.

Because the market cannot by itself guarantee that all Americans have access to high-quality healthcare, the government must protect the interests of its citizens by filling in any holes in the market and regulating it where it is ineffective or unjust.

Achieving high quality care will ultimately need effective collaboration across the federal, state, local, and private sectors. The public and private sectors must work together to translate broad ideas about the proper function of government into particular actions within a fast evolving, decentralized delivery system.

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The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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Answer:

the heating method in here is conventional heating due to the warn air goes to the top bunk whereas the cold air sinks down

Answer:

44

Explanation:

Work = Force X Distance

When a force acts on a disk, it produces torque, which causes the disk to accelerate angularly.The angular acceleration of the disk is 1.5 rad/s².

The magnitude of the torque is given by the equation τ = r × F, where τ is the torque, r is the radius, and F is the force applied. In this case, the force acting on the disk is 60N.

To find the angular acceleration, we need to know the moment of inertia of the disk. The moment of inertia (I) depends on the shape and mass distribution of the object. Assuming we have the moment of inertia (I) for the disk, we can use the equation τ = I × α, where α is the angular acceleration.

Rearranging the equation, we have α = τ / I. Plugging in the given force of 60N and assuming the moment of inertia of the disk is known, we can calculate the angular acceleration.

The equation α = τ / I relates the angular acceleration (α) to the torque (τ) and the moment of inertia (I). In this case, the force acting on the disk is 60N. To find the angular acceleration, we need to know the moment of inertia of the disk. Unfortunately, the moment of inertia is not provided in the question, so we cannot calculate the exact value of the angular acceleration.

However, we can still choose the closest option among the given choices. Among the options provided, the closest value to 60N / I is 1.5 rad/s², which is option e. Therefore, the main answer is that the angular acceleration of the disk is approximately 1.5 rad/s².

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It will take an additional 7.33 minutes for the cake to cool from 200 degrees F to 90 degrees F after the initial 10 minutes of cooling.

To calculate how much longer it will take for the cake to cool to 90 degrees F, we need to first determine the rate at which the cake is cooling. We can do this by calculating the temperature difference between the cake and the room and dividing it by the time it takes for that temperature difference to occur.
In this case, the temperature difference between the cake and the room is 280 degrees F (350-70=280) when the cake is removed from the oven. After 10 minutes, the temperature difference is 130 degrees F (200-70=130). Therefore, the cake is cooling at a rate of 15 degrees F per minute (280-130=150 degrees F in 10 minutes; 150/10=15).
To determine how much longer it will take for the cake to cool to 90 degrees F, we need to calculate the time it takes for the temperature to drop from 200 degrees F to 90 degrees F. This is a temperature difference of 110 degrees F (200-90=110), so it will take approximately 7.33 minutes (110/15=7.33) for the cake to cool from 200 degrees F to 90 degrees F.

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Seismic velocities are influenced by the medium's physical characteristics, including composition, mineral phase and packing structure, temperature, and pressure.

Denser materials allow seismic waves to propagate more quickly, hence depth generally increases the speed of seismic waves. Seismic waves are slowed in abnormally hot regions. A liquid conducts seismic waves more slowly than a solid does. Due to the fact that P waves and S waves cannot propagate through liquid, molten regions of the Earth slow P waves and block S waves.

There are two different types of waves produced by earthquakes: primary (P) and secondary (S). Based on when they come and how they feel on the surface, they are classified.

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The physical properties of the medium, such as composition, mineral phase and packing structure, temperature, and pressure, have an impact on seismic velocities.

What are seismic wave?

The speed of seismic waves is typically increased by depth because denser materials allow for faster seismic wave propagation. In areas that are abnormally hot, seismic waves slow down. Seismic waves are conducted more slowly by liquids than by solids. Molten parts of the Earth impede P waves and block S waves because P waves and S waves cannot travel through liquid.

Primary (P) and secondary (S) waves are the two main types of seismic waves that are generated. They are categorized based on when they arrive and how they feel on the surface.

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The equation for the traveling wave is y(x,t) = (4.20 cm)cos(2.10t - 1.69x), assuming y(0,0) = 0.The transverse velocity of the particle is the time derivative of this expression: v = dy/dt = - (4.20 cm)(2.10)sin(2.10t - 1.693.10 cm).

Here, the argument of the cosine function (2.10t - 1.69x) represents the phase of the wave, where the factor 2.10 represents the angular frequency and 1.69 represents the wavenumber of the wave.The transverse position of the particle at x = 3.10 cm can be found by substituting x = 3.10 cm into the equation for the wave: y(3.10,t) = (4.20 cm)cos(2.10t - 1.693.10 cm). The transverse velocity of the particle is the time derivative of this expression: v = dy/dt = - (4.20 cm)(2.10)sin(2.10t - 1.693.10 cm).Similarly, for a particle located at x = 5.10 cm, the transverse position is y(5.10,t) = (4.20 cm)cos(2.10t - 1.695.10 cm), and the transverse velocity is v = - (4.20 cm)(2.10)sin(2.10t - 1.695.10 cm).The two expressions for transverse velocity are different because they correspond to particles located at different positions along the wave. As the wave travels to the left, particles located at different positions experience different phases of the wave, resulting in different transverse velocities. Physically, this means that the wave is transporting energy and momentum through the medium, causing particles to oscillate and move in a periodic manner. The velocity of a particular particle depends on its position along the wave, and can be different from the velocity of particles at other positions.

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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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A circuit that is drawn on paper and depicts a systematic way that current will flow is referred to as a schematic diagram.What is a schematic diagram

A schematic diagram is a graphic representation of an electrical circuit. It consists of symbols that depict the various components in the circuit. The schematic diagram is drawn in such a way that the components are linked in a systematic manner, indicating how the current will flow throughout the circuit.In summary, a schematic diagram is a drawing of an electrical circuit that shows the arrangement of the components and how the current will flow.

Electromagnetic waves produced by electrons oscillating with a frequency of 2.0 x 10¹⁰ hertz would be classified as radio waves.

Electromagnetic waves are a form of energy that propagate through space in the form of oscillating electric and magnetic fields. These waves are generated by the acceleration or oscillation of charged particles, such as electrons.

The frequency of an electromagnetic wave refers to the number of oscillations or cycles it completes per unit of time. It is usually measured in hertz (Hz), which represents cycles per second. In the given scenario, the electrons are oscillating with a frequency of 2.0 x 10¹⁰ Hz.

Now, let's discuss the classification of electromagnetic waves based on their frequency and wavelength. The electromagnetic spectrum encompasses a wide range of waves, including radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays.

Radio waves have the longest wavelengths and lowest frequencies among the electromagnetic waves. They typically range from a few centimeters to several kilometers in wavelength. These waves are commonly used for various forms of communication, such as radio and television broadcasting, as well as wireless communication technologies like Wi-Fi and cellular networks.

As the frequency of electromagnetic waves increases, we move through the spectrum, encountering microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays in that order. Each segment of the spectrum has distinct properties and applications.

In summary, the electromagnetic waves produced by electrons oscillating with a frequency of 2.0 x 10¹⁰ Hz would be classified as radio waves. These waves have longer wavelengths and lower frequencies compared to other regions of the electromagnetic spectrum and are widely used for communication purposes.

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a) To sketch the graph of the object's velocity vs. time, we need to integrate the acceleration vs. time graph. The velocity is the area under the acceleration vs. time graph.

We can plot the velocity on the y-axis and time on the x-axis. The graph will show the velocity changing over time. Important points on the graph may include the initial velocity at time t = 0, any peaks or valleys, and any moments where the velocity is zero.

b) To determine the object's change in velocity over the first 8 seconds of its motion, we need to calculate the area under the acceleration vs. time graph from t = 0 to t = 8 seconds. This area represents the change in velocity during that time interval.

c) To identify when the object is moving with a constant speed, we need to look for sections on the velocity vs. time graph where the velocity remains constant, resulting in a flat line. The times at which the object switches its direction of motion can be identified by observing the points on the graph where the velocity changes sign, indicating a change in direction.

d) To find the object's total displacement over the first 6 seconds of its motion, we need to calculate the area under the velocity vs. time graph from t = 0 to t = 6 seconds. This area represents the displacement of the object during that time interval.

It is important to note that without the specific shape and values of the acceleration vs. time graph, it is difficult to provide a detailed explanation or numerical answers for parts b, c, and d. The specific characteristics of the graph would be needed to provide accurate calculations and descriptions of the object's motion.

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An archer pulls with a force of 420 N on a 0.20 kg arrow; the force constant k for the bowstring is 700 N/m; the work done in drawing the bowstring back is 126 J; the arrow will be released from the bowstring with a speed of 20 m/s.

The force constant k for the bowstring can be calculated by Hooke's Law,

a) F = kx ( F is the force, k is the force constant, and x is the displacement from equilibrium)

k = F/x

k = 420 N / 0.60 m = 700 N/m

the force constant k for the bowstring is 700 N/m.

b) The work done in drawing the bowstring back is equal to the area under the force-displacement curve, which is a triangle in this case

A = (1/2)bh

(A is the area, b is the base,  h is the height )

A = (1/2)(0.60 m)(420 N) = 126 J

the work done in drawing the bowstring back is 126 J.

c) the conservation of energy is used,

PE = KE

PE is the potential energy stored in the bowstring and KE is the kinetic energy of the arrow.

PE = (1/2)k\(x^2\)

PE = (1/2)(700 N/m)\((0.60 m)^2\) = 126 J

the kinetic energy of the arrow when it is released is also 126 J. Since kinetic energy is given by,

KE = (1/2)m\(v^2\)

v = √((2KE)/m) = √((2 ×126 J) / 0.20 kg) = 20 m/s

Hence, the force constant k for the bowstring is 700 N/m; the work done in drawing the bowstring back is 126 J; the arrow will be released from the bowstring with a speed of 20 m/s.

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The speed of the electric fan graham cracker.

Changes in the dependent variable are influenced by an independent variable. You could therefore say that it is a random variable. Because it is unaffected by the dependent variable, it is called INDEPENDENT.

In this instance, the graham cracker has no impact on the electric fan's speed, whereas the electric fan's speed DOES have an impact on the graham cracker.

Fans can assist in moving the cool air from your air conditioner. Although it is preferable to use and run fans in an active room, there are some advantages to doing so in stuffy stairwells and hallways. Fans placed at the top or bottom of the stairs, down the hallway, or in a room will increase airflow and temperature.

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Nuclear energy is the energy in the nucleus, or core, of an atom. Nuclear energy can be used to create kinetic energy or electricity, but it must first be released from the atom.

Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.

Some primary uses of nuclear energy are- Space Exploration, Nuclear energy provides nearly 20% of electricity in many countries like United States, Medical Diagnosis and Treatment, Criminal Investigation and Agriculture.

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Answer:

The answer is

Explanation:

The velocity or speed of an object can be found by using the formula

\(velocity \: = \frac{distance}{time} \)

From the question

time taken to travel = 10 hours

distance covered = 550 miles

Substitute the values into the above formula and solve for the velocity

That's

\(velocity = \frac{550}{10} \)

We have the final answer as

Hope this helps you

True. The free energy of a system refers to the energy that is available to do work and is represented by the symbol "G." The Gibbs free energy change (∆G) of a chemical reaction is a measure of the difference in free energy between the products and the reactants.

If the free energy of the products is greater than that of the substrates, the Gibbs free energy change will be negative (∆G<0). This means that the reaction is exergonic, and it proceeds spontaneously in the forward direction.

At equilibrium, the concentrations of reactants and products are balanced, and the Gibbs free energy change is zero (∆G=0). If the free energy of the products is greater than that of the substrates, it means that the products have a higher free energy potential and are more energetically favored than the substrates. As a result, there will be a greater concentration of products than substrates at equilibrium.

In summary, the statement is true because a negative Gibbs free energy change indicates that the products are favored over the substrates, resulting in a higher concentration of products at equilibrium.

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Answer:

S = V0 t + 1/2 g t^2

3000 m = 1/2 * 9.8 * t^2       initial speed is zero

t = (6000 / 9.8) ^1/2 = 24.7 sec

The statement "Spectral lines are a phenomenon that can only be seen in the visible wavelength band" is False.The statement "When an atom or molecule moves from a specific high energy state to a specific low energy state, the color of the photon that it emits is random" is False.The statement "Radio and X-ray telescopes produce coarse, less detailed images than gamma-ray telescopes" is False.The statement "Every atom and molecule has its own unique color fingerprint as revealed by spectral lines" is True.

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The magnitude of the load on the crane before the collapse was 7871.48 N, which is well below the maximum load rating of 500 kg.To determine the load on the crane, we need to use the principles of static equilibrium.

The crane is in equilibrium when the sum of the forces acting on it is zero and the sum of the torques is also zero.The forces acting on the crane are tension in the cable and the weight of the horizontal beam. the torque is due to the weight of the horizontal beam.First, calculate the weight of the horizontal beam:

W = mgL = 85.105.0009.810 = 4168.52 N, where m is the mass per meter of length, g is the acceleration due to gravity, and L is the length of the beam.Now calculating the torque due to the weight of the beam :

τ = W*(h/2) = 4168.52*(2.250/2) = 4686.03 Nm, where h is the height of the horizontal beam. since the  crane is equilibrium, the tension in the cable must balance the weight of the beam which is  T = W. now  substituting the values we get :

=>12040 N = 4168.52 N + L=> 12040 N - 4168.52 N = 7871.48 N

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One of the most crucial devices for electronics and communication is the signal generator. For several reasons, including testing, debugging, and designing, it is utilized to produce various types of signals and frequencies.

Engineers create electronic signals using signal generators, which can be analogue or digital, to test circuit designs. Signal generators come in a wide variety of forms with various characteristics and uses. The most typical signal generator kinds and their distinctive qualities are listed below.

Therefore, radar level instruments operate on the principle of generating a signal and then measuring the time required for the signal to reflect off the process fluid back to the transmitter.

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Given :

Capacity of capacitor is, \(C = 10\ \mu F\).

To Find :

At what voltage can a 10 μF capacitor be energized to 0.45 J.

Solution :

We know, energy in capacitor is given by :

\(E = \dfrac{CV^2}{2}\)

So,

\(V = \sqrt{\dfrac{2E}{C}}\\\\V = \sqrt{\dfrac{2\times 0.45}{10}}\ \mu V\\\\V = 0.3 \ \mu V\)

Therefore, voltage required is \(0.3 \ \mu V\) .