Please hurry, being timed. And no links !!!


A ball weighing 10 kg rolls down a frictionless incline with a 50 degree angle to the horizontal. If the balls initial velocity was 0 m/s, how much does the mechanical energy of the system change by the time the ball reaches its destination.


A. Increases by 12%


B. Increases by 58%


C. Decreases by 12%


D. Does not change

Answer:

Explanation:

The mass of the car doesn't matter because On a flat curve the mass of the car does not affect the speed at which it can stay on the curve. You would need the mass if you were solving the the centripetal force acting on the car, but not the acceleration.

\(a=\frac{v^2}{r}\) and filling in

\(a=\frac{(8.5)^2}{48.0}\) and we need 2 significant digits in our answer. That means that

a = 1.5 m/sec²

The bird has the most potential energy when it is at the highest point of its dive into the ocean.

1. Potential energy is the energy possessed by an object due to its position or state.

2. In this case, we are considering the potential energy of a bird diving into the ocean.

3. The potential energy of an object depends on its height and mass.

4. When the bird is at the highest point of its dive, it has the maximum potential energy.

5. As the bird dives deeper into the ocean, its height decreases, resulting in a decrease in potential energy.

6. At the moment the bird reaches the surface of the water, its potential energy is at its minimum, as it is at its lowest height.

7. The potential energy is converted into kinetic energy as the bird accelerates towards the water.

8. Kinetic energy is the energy possessed by an object due to its motion.

9. When the bird enters the water, its potential energy is completely converted into kinetic energy.

10. The bird continues to possess kinetic energy as it moves through the water.

11. Once the bird comes to a stop in the water, its kinetic energy is reduced to zero.

12. At this point, the bird's potential energy is also zero, as it is at its lowest height and not in motion.

13. Therefore, the bird has the most potential energy when it is at the highest point of its dive into the ocean.

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Answer:

B. Tomatos reflect red light

Explanation:

The only reason colors exist is because the objects with color reflect all other light except for what they are portrayed as. White reflects all colors, and black absorbs all colors.

If you have any questions feel free to ask :)

Answer:

Explanation: the pigment atoms in the skin absorb photons of all energies except those that correspond to red wavelengths of light, which they reflect back to your eye.

B is more likely the answer

Small amounts of organic acids are generated during the catabolism of amino acids and compounds that contain phosphate groups.

Supporting Answer: During the process of catabolism, which involves the breakdown of molecules for energy production, the metabolism of amino acids and compounds containing phosphate groups leads to the formation of organic acids. These organic acids are produced in small quantities as byproducts of various metabolic pathways. The catabolism of amino acids results in the release of organic acids such as acetic acid, pyruvic acid, and citric acid, among others. Similarly, when compounds with phosphate groups, such as nucleotides or phospholipids, are metabolized, organic acids like phosphoric acid and phosphoglyceric acid can be generated.

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The average angular velocity of the oxygen molecule is 1.28 x 10^12 radians/sec.

The total kinetic energy of the oxygen molecule can be expressed as the sum of its translational and rotational kinetic energies:

KE_total = KE_translational + KE_rotational

Given that the rotational kinetic energy is two-thirds of the translational kinetic energy, we can write:

KE_rotational = (2/3)KE_translational

We also know that the total kinetic energy is related to the mean speed by the formula:

KE_total = (1/2)mv²

where m is the mass of the molecule and v is its mean speed.

Substituting the expressions for KE_rotational and KE_total into this equation, we get:

(5/6)KE_translational = (1/2)mv²

Solving for the translational kinetic energy, we obtain:

KE_translational = (3/5)mv²

The moment of inertia of the oxygen molecule can be related to its angular velocity by the formula:

KE_rotational = (1/2)Iω²

where I is the moment of inertia and ω is the angular velocity.

Substituting the expressions for KE_rotational and I, and solving for ω, we get:

ω = √((2/3)KE_translational / I)

Substituting the expressions for KE_translational, I, m, and v, we obtain:

ω = √((2/9)mv² / I)

Finally, substituting the given values, we get:

ω = 1.28 x 10¹² radians/sec.

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An electrical arc blast can approach temperatures of 35,000°F (19,426°C), which vaporizes metal parts and produces an explosive and deadly pressure wave.

An electrical fault with a high fault current or an electric arc fault can result in an explosive release of energy known as an electric arc blast. It's a dangerous situation that could seriously harm nearby equipment and endanger people's safety. The quick release of high-pressure gases, great heat, and intense light that occur during an electric arc blast cause an explosive explosion-like phenomena. The blast may cause the air around it to rapidly expand, creating a shockwave and launching debris into the air.

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Height

Option B is correct

The roller coaster is a railway with a large height and steep inclines that is basically found in the amusement park for carrying a train of people for a fun ride.

The speed of the roller coaster is determined by a number of factors such as the energy input, drag force, temperature, mass, etc.

The height at which the roller coaster is released when launched determines greatly the speed of the motion of the roller coaster

The mass of solute dissolved in 5.00 kg of 40.0% antifreeze solution is 2.00 kg.

The mass of solute dissolved in 5.00 kg of a 40.0% antifreeze solution can be calculated using the equation:
Mass of solute = (Percent concentration / 100) * Mass of solution
In this case, the percent concentration is 40.0% and the mass of the solution is 5.00 kg.

First, convert the percent concentration to a decimal by dividing it by 100:

40.0% / 100 = 0.4

Then, multiply the decimal concentration by the mass of the solution:

0.4 * 5.00 kg = 2.00 kg

Therefore, the mass of solute dissolved in 5.00 kg of a 40.0% antifreeze solution is 2.00 kg.

So, the correct answer is 2.00 kg.

In conclusion, the mass of solute dissolved in 5.00 kg of 40.0% antifreeze solution is 2.00 kg.

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1. Proper Training and Knowledge: The first and most important step in avoiding injury from electrical devices is to receive proper training and knowledge about how to safely operate and handle electrical equipment. It's essential to understand the risks and hazards associated with electrical devices, including the dangers of electric shock and the potential for fire or explosion.

2. Use of Protective Gear and Equipment: Another crucial means of avoiding injury from electrical devices is to use appropriate protective gear and equipment.

This includes wearing rubber gloves and safety glasses when working with electrical equipment, using insulated tools to prevent electric shock, and wearing appropriate clothing to reduce the risk of fire or electrical burns. Additionally, always make sure to use equipment that is properly grounded and to avoid using damaged or frayed electrical cords.

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Answer:

faces

Explanation:

Answer:

Explanation:

The similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.

A lever is a rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied.

A lever has three classes based on the position of the fulcrum as follows:

Therefore, the similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.

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Answer: .0286 web0ers/m^2

Explanation:

The temperature and color of stars are related in the following ways: 1. Temperature and Color in starsIn astronomy, the color of a star is related to its surface temperature. The photosphere, which is the outermost layer of a star, emits most of the radiation that is detected by telescopes.

The color of a star is determined by the wavelength of light emitted by the star, which is linked to the surface temperature of the star.

The Wien's displacement law explains this relationship by stating that the peak wavelength of radiation emitted by a star is inversely proportional to the star's surface temperature.

2. Hotter stars are more blue in color and have higher surface temperatures.

When the surface temperature of a star rises, the wavelength of light emitted by the star shifts to shorter wavelengths.

This implies that a hotter star emits more blue and ultraviolet light, resulting in blue coloration.

3. Cooler stars are more red in color and have lower surface temperatures.

When the surface temperature of a star is lower, the wavelength of light it emits shifts to longer wavelengths. As a result, cooler stars emit more red and infrared light, which results in a reddish hue.

4. Color Classification of StarsStars are categorized based on their color and surface temperature, with the following classifications being commonly used:

O, B, A, F, G, K, and M. O-type stars are the hottest, followed by B, A, F, G, K, and M-type stars, with M-type stars being the coolest.

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The time of flight of bullet is 0.0685 seconds and the speed when it emerges out of the gun is 775.

As the bullet is fired horizontally from the gun at a distance of 53m away. But the bullet hits the target 2.3cm below the target.

So, the vertical displacement of the bullet is 2.3cm. The accelerations in the vertical direction will be g (acceleration due to gravity).

(a) As we know, in case of gravity, we can use equations of motion,

So, using equation,

S = ut + 1/2gt²

Where, u is the initial velocity of the bullet which is 0m/s in this case,

S is the vertical displacement of the bullet,

g is acceleration due to gravity and,

t is time of flight of the bullet.

Putting all the values,

S = 1/2gt²

2.3/100 = 1/2(9.8)(t²)

0.023 = 4.9t²

t² = 0.00469387

t = √0.0046987

t = 0.0685 seconds.

(b) The velocity as it emerges from the gun is equal to the muzzle velocity of the gun,

So, we can write,

Muzzle velocity V = Horizontal distance covered/time taken.

V = 53/0.0685

V = 773.72 m/s.

One thing that should be noted here is that the initial velocity that we took as zero in part (a) is taken with respect to the vertical motion and nit the Horizontal motion. So, one should not confuse the muzzle velocity in part (b) with the initial velocity mentioned in the part(a)

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Complete question - A rifle is aimed horizontally at a target 53 m away. The bullet hits the target 2.3 cm below the aim point. Find

(a) the bullets time of flight and (b) its speed as it emerges from the rifle?

Answer:

speed is equal to distance/time

so 2m/40s

=0.05

ANSWER:

1. C. Wave X and Wave Y share the same speed.

2. D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.

STEP-BY-STEP EXPLANATION:

The amplitude of a wave does not affect the speed at which the wave travels. Both wave A and wave B travel at the same speed. The speed of a wave is only altered by alterations in the properties of the medium through which it travels.

Therefore, in the first art the correct answer is C. Wave X and Wave Y share the same speed.

If the medium is uniform (does not change), the speed of the wave will be constant.

Therefore, the correct answer is: D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.

The resultant force on the ball is 50 N.

Reusltant force can be defined as the sum of the force acting on a object.

Note: From the question, the forces from both kicks are at right angle to each other.

And to calculate the resultant force on the ball, we use the formula below.

Formula:

From the question,

Given:

Substitute these values into equation 1

Hence, the resultant force on the ball is 50 N.

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Answer:

\(Amount\ of\ wire\ used=\frac{M}{44.5\ g/km}\)

mount of wire used=12.808989 Km

Amount of wire used=12808.989 m

Explanation:

Given Data:

Diameter of wire=d=0.080 mm=0.00008 m

Weight of wire per unit length=44.5 g/km

Spool weighs=M=570 g

Required:

Amount of wire used=L=?

Solution:

Formula is:

\(Amount\ of\ wire\ used=\frac{Spool\ weighs}{Weight\ per\ unit\ length}\)

\(Amount\ of\ wire\ used=\frac{M}{44.5\ g/km}\)

The above expression is mathematical model of finding how much wire is used. just put the Value of M we will get the answer.

\(Amount\ of\ wire\ used=\frac{570\ g}{44.5\ g/km}\)

Amount of wire used=12.808989 Km

Amount of wire used=12808.989 m

Answer:

t = 0 1.697 seconds

Explanation:

Comment

This is a standard question where the time is the same for both the vertical distance the ball has to drop and the time it takes to go horizontally.

Formulas

dv = vi*t + 1/2 a t^2

dv is the vertical distance that the ball has to travel in a downward direction

dh = vh * t

Givens

a = 9.81

dv = 1.44

vi = 0

t = ?

dh = 2 m

t = same as above (but not given)

Solution

dv = 1/2 a * t^2

1.44 = 1/2 * 9.81 *t^2                 Multiply by 2

2*1.44 = 1/2 * 2 * t^2

2.88 = t^2

t = 1.697 seconds

Note that you do not have to use the horizontal information to get the time. You only have to realize that the ball has no vertical velocity to begin with.

Answer: (b) the night would be half as long

Explanation: As the earth, if rotated twice as fast than it does now and the sun stayed the same then the night would be as half as long as the rotation of the planet on its axis would be double to that of its and 12 hours of night would be as long as the speed of the axial rotation.

The recoil speed of the flatcar is0.5 m/s.

The cannon's momentum equals the flatcar's momentum according to Newton's third law of motion.

mv = MV........................ Equation 1:

where m is the cannon's mass, v is its velocity, and m is the flatcar's mass, v is its velocity.

Assign V as the subject of the equation V = mv/M... Equation 2

Given: M = 1000 kg

m = 10 kg,

and v = 50 m/s

Replace with V = 1050/1000 V = 500/1000

V = 0.5 m/s in equation 2.

Consequently, the flatcar's speed is equal to 0.5 meters per second.

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Answer:

200N

Explanation:

mass = 20 kg

acceleration = 10 m/s^2

Force = mass * acceleration

         = 20 *10

         = 200 N

The photoelectric effect is observed when light interacts with matter, specifically when photons (particles of light) transfer their energy to electrons in an atom or a material. The correct answer is A. When an electric current results from light shining on a surface.

In the early 20th century, Albert Einstein provided a groundbreaking explanation of the photoelectric effect, which earned him the Nobel Prize in Physics in 1921. His work established the dual nature of light, both as a wave and as a particle (photon). Here's a detailed explanation of the photoelectric effect:

When light shines on a surface, it is composed of photons that carry energy. These photons interact with electrons in the material. The photoelectric effect occurs when photons transfer their energy to electrons, causing them to be emitted from the material.

The process can be described in several steps:

1. Absorption: When a photon with sufficient energy interacts with an electron in an atom or material, it can be absorbed. The energy of the photon is transferred to the electron, promoting it to a higher energy level or even releasing it from the atom.

2. Ejection: If the energy of the absorbed photon is greater than or equal to the binding energy of the electron (also known as the work function), the electron can be ejected from the material. The work function represents the minimum energy required to remove an electron from the material's surface.

3. Electron emission: The ejected electron can now contribute to the formation of an electric current. If there is a conducting material connected to the surface, the released electron can move through the material, resulting in the flow of electric charge.

The photoelectric effect is not observed when light acts solely as a wave (option B). While light does exhibit wave-like properties, such as interference and diffraction, these phenomena do not directly involve the transfer of energy from photons to electrons.

Option C, "When an electric current causes light to be produced," does not accurately describe the photoelectric effect. The photoelectric effect involves the emission of electrons due to the interaction of light with matter, but it does not directly produce light as a result of an electric current.

Option D, "Any time an electric current is produced," is a broad statement that encompasses various phenomena beyond the photoelectric effect. Electric currents can be produced in various ways, such as through the flow of charged particles or the movement of electrons in a conductor. The photoelectric effect is a specific phenomenon that occurs when light interacts with matter and results in the emission of electrons.

To summarize, the photoelectric effect is observed when light shines on a surface, and the energy of photons is transferred to electrons, leading to their emission from the material. This emission of electrons can result in the formation of an electric current.

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I think it is the question:

When is the photoelectric effect observed?

A. When an electric current results from light shining on a surface

B. When light acts as a wave

C. When an electric current causes light to be produced

D. Any time an electric current is produced .

The final linear velocity of the thin cylindrical shell is 4.95 m/s

Given that:

The height H, of the inclined plane=2.5m

Gravitational acceleration, g=9.8m/s^2

Let consider the rotational inertia I₁ of the cylinder shell;

I₁ = mR²

We are also told that there both the cylinders are rolled down without slipping:

v₁=ω₁R

ω₁=v₁/R

Where v₁ is the linear velocity, ω₁ is the angular velocity and R is the radius of the cylindrical shell

Taking the conservation of energy, we have final linear velocity v₁ as:

\(v_{1} =\sqrt{g*H}\), where H=2.5m and g=9.8m/s^2

\(v_{1} =\sqrt{9.8*2.5}\)

\(v_{1} =\sqrt{24.5}\)

\(v_{1} =4.95m/s\)

Hence, the final linear velocity is 4.95 m/s

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Proton will undergoes the lesser acceleration

Due to the opposite polarity of an electron and a proton, when they are in an electric field, they are attracted to one another by an electrical force of equal strength. However, because of their opposing charges, the force's direction will be the opposite.

An electron will accelerate more quickly than a proton because of the difference in mass between the two particles.

Thus, the electric forces acting on them will be equal in strength but directed in the opposite direction. Since the mass of the proton is 1836 times greater than the mass of the electron, its acceleration will be [1/1836] times greater.

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Answer:

The sound waves from a radio speakers

Explanation:

Answer:

the answer is 90 m/s

Explanation:

.....

The nebular hypothesis describes that when a cloud collapses into a star system a new star is forming inside this glowing cloud of gas.

The nebular theory proposes that a rotating cloud of material called a nebula, composed primarily of light components, flattened into a protoplanetary disc and developed into a solar system made up of a star and circling planets.

The Sun originated independently from a collapsing cloud of gas and dust, and as the planets passed by it later, they were gravitationally pulled in.

Individual stars and their planets develop from the revolving clouds' flattening into protostellar discs.

Most of the angular momentum is transmitted into the residual accretion disc through an unidentified mechanism that is thought to be related to the powerful magnetic fields associated with a newborn star.

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When salt is added, it makes it harder for the water molecules to escape from the pot and enter the gas phase, which happens when water boils, Giddings said. This gives salt water a higher boiling point, she said.

Answer:

Explanation:

Adding salt (independent variable) causes the boiling temperature of the water (dependent variable) to increase.