Serena drops a 5-kg book down the stairwell. What is the book's final velocity vf after it falls
freely for 4 seconds

Answer:

The circuit works the same no matter where you put the switch

Explanation:

Part of the electrical code (for house wiring) says that the switch should always go between the hot conductor and the load. This is for safety

In a melting profile for DNA, the absorbance at 260 nm increases as a result of the disruption of the DNA structure. Denaturation is the fundamental physical basis for the absorbance increase

As a result of denaturation, many of the weak connections or bonds (such as hydrogen bonds) that give proteins their highly organized structure in their native (natural) state are broken. Most denatured proteins are insoluble and have a looser, more erratic structure.

Denaturation is the term used to describe how a protein unfolds or fragments, changing its typical three-dimensional structure. A protein's polypeptide chains may become disordered or unfurl due to chemical reaction, heat, or agitation, rendering the molecule normally non-functional. Egg whites are a perfect example of a denaturation that has been denaturized.

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Answer:

W = 1418.9 J = 1.418 KJ

Explanation:

In order to find the work done by the pull force applied by Karla, we need to can use the formula of work done. This formula tells us that work done on a body is the product of the distance covered by the object with the component of force applied in the direction of that displacement:

W = F.d

W = Fd Cosθ

where,

W = Work Done = ?

F = Force = 151 N

d = distance covered = 10 m

θ = Angle with horizontal = 20°

Therefore,

W = (151 N)(10 m) Cos 20°

W = 1418.9 J = 1.418 KJ

Kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases.

Graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.

The magnetic field is the field in the space and around the magnet in which the magnetic field can be filled.

Magnetic force is the force of attraction or repulsion between two poles of the two magnets. The magnetic force is also appearing between two electrically charged bodies.

Two magnets held apart. Once released, the south pole of one magnet moves toward the north pole of another magnet until the magnets collide.

The graph reflection of kinetic energy of magnet -

Therefore, graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.

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Answer: Heat

Explanation: All matter is made of tiny particles called atoms, molecules and ions. These tiny particles are always in motion – either bumping into each other or vibrating back and forth. It is the motion of particles that creates a form of energy called heat (or thermal) energy that is present in all matter

The rest mass of a spacecraft is 620,000 tons. Its mass would be 715,088.8 tons if you could measure it when it was moving at half the speed of light.

The mass of a moving object is given by the relativistic mass formula:

\(m = m_0 / \sqrt{(1 - v^2/c^2)}\)

here,

m₀ is rest mass of the object,

v is velocity, and

c is speed of light.

In this case, the rest mass of the spaceship is m₀ = 620,000 tons. If it is traveling at half the speed of light, its velocity is v = 0.5c, where c is approximately 299,792,458 m/s.

Reserving the values:-

\(m = m_0 / \sqrt{(1 - v^2/c^2)}\)

= \(620,000 tons / \sqrt{(1 - (0.5c)^2/c^2)}\)

=\(620,000 tons / \sqrt{(1 - 0.25)}\)

= \(620,000 tons / \sqrt{(0.75)}\)

= 620,000 tons / 0.866

= 715,088.8 tons

Therefore, the mass of the spaceship when it is traveling at half the speed of light is approximately 715,088.8 tons. Note that the relativistic mass of an object increases as its velocity approaches the speed of light. At speeds much smaller than the speed of light, the relativistic mass is approximately equal to the rest mass.

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Answer:

In the given graph,

Velocity is constant between 4 to 8 which is 2m/s

So, at t=5s

Instantaneous velocity=2m/s

Explanation:

hope this help u thank u

The function of sleep theory supported by the illustration is sleep conserves and protects.

From the first sentence, bats sleep a lot because they face little danger from predators and as such, they have a high-calorie diet of insects.

From the second sentence, cows sleep less, because they face more danger from predators and as such, they have a low-calorie diet of insects.

We can conclude that sleep helps to keep animal safe. Therefore, the correct option will be, "Sleep conserves and protects".

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The design that has the metal bar would increase the chances of an elastic collision and lead to an increase of the velocity of the car after collision.

We know that an elastic collision is one in which there is a conservation of the kinetic energy of the momentum. Recall that the colliding particles would have to constitute a closed system such that there is no loss in the momentum of the objects that are colliding.

We have two designs of the bumpers of the cars. We know that the balloon  design would have more tendency to have this car stick to the other car and create an inelastic Collison.

However, with the metal bar design, there is less tendency that the cars would stick together after collision and we would have an elastic collision. The effect of this is that velocity of the car 2 may increase after the collision.

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The measured temperature change would be smaller if the calorimeter had been made out of a heat-conducting material like metal instead of styrofoam.

A calorimeter is a device used to measure the heat absorbed or released during a chemical or physical reaction. It is designed to minimize the amount of heat lost to the surroundings. Styrofoam is an insulating material that does not conduct heat well, which makes it an excellent choice for a calorimeter. However, if a calorimeter had been made out of a heat-conducting material like metal, it would transfer heat more easily to the surroundings, resulting in a larger temperature change being observed.

This is because heat will be transferred from the reaction to the metal calorimeter and then to the surroundings. This transfer of heat will occur more efficiently in a metal calorimeter than in a styrofoam calorimeter. As a result, the amount of heat measured by the calorimeter would be lower than the actual amount of heat released or absorbed by the reaction. Therefore, a metal calorimeter would result in a smaller measured temperature change than a styrofoam calorimeter.

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Answer:

Velocity = 6.89 m/s

Explanation:

The equation for momentum: \(Momentum=(Mass)(Velocity)\)

Substitute the given information into the equation and solve for velocity.

\(239.5=34.75(Velocity)\\\frac{239.5}{34.75}=\frac{34.75(Velocity)}{34.75\\}\\6.89=Velocity\)

MAIN ANSWER in 30 WORDS:
A) α = 8.8 rad/s^2; B) at = 118.8 m/s^2; C) ac = 413.52 m/s^2.

EXPLANATION PART IN 120 WORDS:
A) Angular acceleration α can be calculated using the formula α = (ω - ω0)/Δθ. Substituting values, we get α = (8.8 - 4.4)/5.5 = 0.8 rad/s^2.

B) Tangential acceleration at can be calculated using the formula at = Rα, where R is the radius of the platform. Substituting values, we get at = 34 × 0.8 = 27.2 m/s^2.

C) Final centripetal acceleration ac can be calculated using the formula ac = Rω^2, where ω is the final angular velocity. Substituting values, we get ac = 34 × 8.8^2 = 413.52 m/s^2.

Therefore, the angular acceleration is 0.8 rad/s^2, the tangential acceleration at the outer edge of the platform is 27.2 m/s^2, and the final centripetal acceleration at the outer edge of the platform is 413.52 m/s^2.

The angular acceleration of the platform is 0.8 rad/s^2, the tangential acceleration at the outer edge of the platform is 27.2 m/s^2, and the final centripetal acceleration at the outer edge of the platform is 2617.6 m/s^2.

A) The angular acceleration α of the platform can be calculated using the formula: α = (ω^2 - ω0^2) / (2Δθ). Plugging in the values, we get α = (8.8^2 - 4.4^2) / (2 * 5.5) = 44/11 rad/s².

B) The tangential acceleration at of a point on the outer edge can be calculated using the formula: at = α * R. Converting R to meters, we get R = 0.34 m. Thus, at = (44/11) * 0.34 = 1.36 m/s².

C) The final centripetal acceleration ac can be calculated using the formula: ac = ω^2 * R. Plugging in the values, we get ac = 8.8^2 * 0.34 = 26.424 m/s².

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Explanation:

Glass is the best sound absorber material.

Answer:

Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving. An example of momentum is how quickly a car is moving down a hill.

Answer:

75%(TT,Tt,tt) Hope that helps

Imagine that you took a road trip. Based on the information in the table, what was the average speed of your car? 195 Time Mile marker 3:00 pm 28 8:00 pm Express your answer to three significant figures and include the appropriate units.

Based on the information in the table, we can calculate the total distance traveled by subtracting the initial mile marker from the final mile marker. 155 32 123 miles We can calculate the total time traveled by subtracting the starting time from the ending time. 8:00 pm 3:00 pm 5 hours to find the average speed, we can divide the total distance traveled by the total time traveled. 123 miles 5 hours 24.6 miles per hour Therefore, the average speed of the car during the road trip was 24.6 miles per hour.

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Design a spring-launched roller coaster with a max compression of 2.5m, 450kg car, and safety with 13% larger spring constant.

To design a spring-launched roller coaster, I will start by calculating the minimum spring constant needed for the car to reach the top of the 12-m hill. From there, I will increase the spring constant by 13% to ensure safety.

The spring will be compressed a maximum of 2.5 m, and the loaded car will have a maximum mass of 450 kg.

The car will ascend the hill and then descend 18 m to the track's lowest point, providing an exhilarating ride for two passengers per car.

With these specifications in mind, I will use my knowledge of physics to create a thrilling and safe roller coaster experience.

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if i add bulb b then brightness of each bulb may be slightly less than when it was the only bulb in the circuit .

When you add bulb B in parallel with the original bulb, the overall resistance of the circuit decreases, allowing more current to flow through the circuit. As a result, both bulbs will receive more current, and they will shine brighter than before. Essentially, the bulbs will share the current flowing through the circuit, and the total current will be divided between the two bulbs. However, the brightness of each bulb may be slightly less than when it was the only bulb in the circuit because they are now sharing the current.

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Answer:

calculate the mass of mass A i the diagram .the frame joining the mass is massless

Explanation:

The mass of mass A the diagram .the frame joining the mass is massless.

The unique location in an object or system that can be used to describe how the system reacts to outside forces and torques is referred to as the "center of mass" or "center of gravity" in a uniform gravity field.

The idea of the center of mass is that it is the average of all the masses divided by the distances between them. With regard to the torques produced, that is comparable to balancing a seesaw around a pivot point in one plane.

Therefore, The mass of mass A the diagram .the frame joining the mass is massless.

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Answer:

The time it takes the ball to fall 3.8 meters to friend below is approximately 0.88 seconds

Explanation:

The height from which the student tosses the ball to a friend, h = 3.8 meters above the friend

The direction in which the student tosses the ball = The horizontal direction

Given that the ball is tossed in the horizontal direction, and not the vertical direction, the initial vertical component of the velocity of the ball = 0

The equation of the vertical motion of the ball can therefore, be represented by the free fall equation as follows;

h = 1/2 × g × t²

Where;

g = The acceleration due gravity of the ball = 9.81 m/s²

t = The time of motion to cover height, h

Then height is already given as h = 3.8 m

Substituting gives;

3.8 = 1/2 × 9.81 × t²

t² = 3.8/(1/2 × 9.81) ≈ 0.775 s²

∴ t = √0.775 ≈ 0.88 seconds

The time it takes the ball to fall 3.8 meters to friend below is t ≈ 0.88 seconds.

Location of the ball is top of the circle and acceleration is 3g.

Since tension force is more, surely ball is having net force upward and hence, the location of the ball in this case is top of the circle.

Any object that moves in a circle has an acceleration vector towards the center of that circle. This is known as Centripetal acceleration.

total force/ net force when ball is top of the circle is sum of tension force and gravity force.

\(F_{net\) = T + mg

Because of this net force, there is centripetal acceleration towards the center.

so, T + mg = ma

2mg + mg = ma

3mg = ma

a = 3 × force of gravity

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Answer:

80 Percent

Explanation:

E=energy output/energy input×100

E=8000/10000×100

E=0.8×100

E=80 percent.

Mark brianliest if my answer suit your question

If the machine put, in 8000 J, and the user puts 10,000 J of work then the efficiency of the machine will be equal to 80%.

Work is a physics term used to describe the transfer of energy that takes place when an object changes above a distance because of an external force, at least some of which is given in the vector of the dislocation. The element of the force acting all along the path multiplied by the length of the path can be used to calculate work if the force is constant.

Mathematically, this idea is expressed as W = fd, where W is the effort and f is the force multiplied by d, the distance. Work is completed whenever the force is applied at an angle with about the displacement.

As per the data provided in the question,

Total input energy = 10,000 J

Total output energy = 8,000 J

Then, the efficiency (η) of the machine will be,

η = (output energy/input energy) × 100

η = 8000/10000 × 100

η = 80%.

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Answer:

change  in velocity over change in time

Explanation:

The acceleration on the 5kg block is 1.088m/s^2

Data;

To solve this question, we just need to use Newton's second law of motion which states that "the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it."

\(F_n_e_t = M_t_o_t_a_l * a\\F = ma\\F_n_e_t = mg\\\)

But then the force on both sides will be

\(mg = ma\\5g - 4g= (4+5) a\\(5-4)g = 9a\\g = 9a\\a = \frac{g}{9} \\a = \frac{9.80}{9} \\a = 1.088 m/s^2\)

The acceleration on the 5kg block is 1.088m/s^2

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1. The equation for impulse used in the image is: J = Ft

2. Where: J =  impulse of force; F = force and t = time interval.

3. Airbag increases the time of impact, that's why, for same impulse, the amount force lessen.

In physics, the term "impulse" is used to characterize or measure the impact of force operating gradually to alter an object's motion. It is often stated in Newton-seconds or kilograms per second and is denoted by the symbol J.

Impulse of force is = force applied × time interval = change in momentum.

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Answer:

lhf

Explanation:

.

Answer:

Josie's ball faster than T