Which of the following describes a referee's job?
A. Cheering the players on.
O B. Keeping score for the team on offense.
C. Supervising the game to make sure teams are playing fairly.
O D. Settling arguments between players.​

Answer:

Lost energy = 2J

Explanation: Given that the

Mass of the pendulum M = 1.0kg

Initial energy E = 10J

Height h = 0.1 m

Speed V = 4 m/s

Let us use conservation of energy to analyze the senero

The maximum P.E at the initial position will be equal to maximum P.E for travelling down the hill

I.e

Total P.E = total K.E

K.E = 1/2MV^2

K.E = 1/2 × 1 × 4^2

K.E = 8J

Since P.E = K.E

P.E = 8J

But initially energy E = 10J

Lost energy = P.E - E

Lost energy = 10 - 8 = 2J

Answer: B chemical

Explanation: it will make a chemical reaction

Final answer:

Signs warning against use near an open flame are referencing a substance's flammability, which is a b) chemical property indicating how substances react chemically, such as burning.

Explanation:

Signs that say "do not use near an open flame" usually refer to the flammability of a substance; this is a chemical property. A chemical property describes how a substance changes its chemical structure in reaction to other matter. Flammability indicates the ability of a substance to burn or ignite, causing it to change chemically from the original substance to new chemical products as a result of the reaction with an open flame.

For example, when a match burns, the chemical properties of the match are displayed because new substances such as carbon dioxide and water vapor are produced from the combustion process.

Answer:

If said tires were not properly inflated more of the tire would be touching the ground due to the "sag" greatly increasing the friction of the road and the tires also maybe slightly less relevant the axle has to "lift" the tire around each rotation of the wheel which together would make it much harder for the bus to move forward.

Explanation:

To calculate the frequency of a sound wave with a speed of 345 m/s and a wavelength of 1.31 m, use the formula f = v / λ, which yields a frequency of approximately 263.36 Hz.

To find the frequency of a sound wave, you can use the formula for the speed of sound, where speed (v) is equal to the product of the frequency (f) and the wavelength (λ). This relationship is expressed as v = f × λ. Given the speed of sound is 345 m/s and the wavelength is 1.31 m, you can rearrange the formula to solve for frequency: f = v / λ.

By substituting the given values, the calculation for frequency is: f = 345 m/s / 1.31 m. This gives us a frequency of approximately 263.35877862595 Hz, which we can round to 263.36 Hz.

During a baseball game, the ball accelerates more than the bat when hit because the bat has more mass, resulting in a smaller acceleration. A more massive bat can make the ball fly off faster due to greater energy transfer, explained by the center of mass concept. The physics behind this phenomenon involves Newton's third law and the relationship between force and acceleration.

Understanding the Physics of a Bat Hitting a Ball

When a batter hits a baseball, both the bat and ball exert forces on each other due to Newton's third law, which states every action has an equal and opposite reaction. However, the ball accelerates away from the bat more than the bat accelerates away from the ball because of their different masses. According to the formula acceleration (a) = force (F) / mass (m), since the bat has a larger mass, it will have a smaller acceleration compared to the ball, which has a smaller mass. This relationship is also reflected in the concept that more massive bats and rackets impart more speed on the ball. The center of mass frame explains this by considering that a heavier racket or bat has more inertia, allowing a greater transfer of energy to the ball during impact, especially when the racket or bat is initially at rest.

The follow-through in sports like tennis or baseball increases the time of impact, which increases the velocity change of the ball. Also, the force exerted by a bat on a ball in a collision can be measured by the change in the ball's velocity and the duration of the impact. For example, if a 150-g baseball reverses direction after colliding with a bat, the average force exerted can be calculated using the change in velocity and the collision time.

In conclusion, the reason the ball accelerates more than the bat upon impact, and why a heavier bat makes the ball leave faster, is due to the principles of physics involving mass, force, and acceleration, as well as energy transfer during the collision.

Answer:

Here down below is 3 things true about composite materials

Explanation:

-They’re made up of more than one substance.

-They have the same or similar properties as the materials used to make them.

-They’re always made of metal.

-They’re readily available in nature.

Answer: form electrostatic attraction between oppositely charged icons

Explanation:

Answer:

Explanation:

Ionic bonds usually form when the tendency of an atom attracts electrons, if the attraction is powerful between the two atoms, a ionic bond can form

Answer:

2,200 Watts

Explanation:

The power of the truck is "2200 W".

Given:

Force,

Distance,

Time,

As we know,

→ [tex]Power (P) = \frac{FD}{t}[/tex]

By substituting the values, we get

→                   [tex]= \frac{11000\times 5}{25}[/tex]

→                   [tex]= \frac{55000}{25}[/tex]

→                   [tex]=2200 \ W[/tex]  

Thus the above approach is appropriate.

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Answer:

C

Explanation:

Answer:

kg·m2·s−3·A−1

I hope this helps you

In the equation for kinetic energy, velocity (v) should be in meters per second (m/s), particularly when working with other factors like gravitational potential energy, where units also involve meters and seconds.

The question is addressing the format of kinetic energy. In the kinetic energy equation Ek = 1/2m * v², v represents the velocity of the object. It can be measured in various units; however, in this context, the unit of velocity (v) should be meter per second (m/s) to ensure the correct calculation of kinetic energy.

In problem-solving contexts where you are dealing with gravitational potential energy (e.g., mgh), height (h) would need to be in meters, and acceleration due to gravity (g) is typically in m/s². Therefore, in both of these situations, your velocity (v) should be in meters per second.

As you deal more with problems relating to kinetic energy, it's useful to know that these units should be the same across your calculations to ensure your final answer is consistent and correct. This practice is a key aspect of understanding kinetic energy calculations.

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Answer:

Estimated requirements: US & Canadian Dietary Reference Intake guidelines: Women aged 19 to 70 years old: 46 gms of protein per day (based on 57.5 kg individual). Men aged 19 to 70 years of age: 56 grams of protein per day (based on 70kg individual).

Explanation:

Protein intake varies based on age, gender, and activity level. Generally, teenage boys need about 52 grams, teenage girls need about 46 grams, adult men need about 56 grams, and adult women need about 46 grams. These values could increase for active individuals.

The amount of protein you need each day depends on your age, gender, and activity level. For example, a sedentary teenage boy generally needs about 52 grams of protein a day, while a sedentary teenage girl generally needs about 46 grams. However, if the teenager is active, they may need more protein to support muscle growth and repair. Adults generally need about 56 grams of protein per day for men and 46 grams for women. But again, if active, they may need more. Always consult with a healthcare provider or nutritionist to better understand your daily protein needs.

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Answer:

C) Current X has a lower potential difference than Current Y.

Explanation:

Answer:

impact force

Explanation:

An impact force is a type of contact force. An impact force is a force that exerts a large amount of force over a short time.

Hitting a nail with a hammer is one example of an impact force.

Final answer:

An impact force is applied when a nail is hit with a hammer. This type of force arises from the hammer making contact and exerting a large force over the small area of the nail tip, resulting in high pressure.

Explanation:

The type of contact force applied when a nail is hit with a hammer is an impact force. This force results from the interaction of the hammer coming into contact with the nail and is a consequence of the interatomic electric forces that arise when objects touch each other. Tension, friction, and spring forces are examples of contact forces, but in the case of a nail being hammered, the instantaneous and high magnitude force is indeed an impact force.

To calculate the force required to create a pressure of 3.00 × 10⁹ N/m² on a nail with a circular tip of 1.00 mm diameter, we can use the formula Pressure (P) = Force (F) / Area (A). Firstly, find the area of the nail's tip using the formula for the area of a circle, A = πr², where r is the radius. Since the diameter is 1.00 mm, the radius is 0.5 mm or 0.0005 meters. After calculating the area, rearrange the formula to solve for the force, F = P * A.

The velocity of a satellite orbiting at an orbital radius r can be determined using a formula. By substituting 3r into the formula, the velocity at the new orbital radius can be found.

The velocity of a satellite orbiting Earth at an orbital radius r can be determined using the formula v=√(GM/r), where M is the mass of Earth, G is the gravitational constant, and v is the velocity. If the satellite is moved to an orbital radius of 3r, the new velocity can be found by substituting 3r into the formula. The new velocity would be v=√(GM/(3r)).

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Explanation:

Create mounds.

Plant the seeds.

Watch for sprouts to appear.

Mulch each hill with a suitable material after the plants have reached a height of about 4 inches or so

Water less when the flowers bloom.

good day and be safe

∵∴∵∴∵∴∵∴∵      

⊕ΘΞΠΤ⊕      

∵∴∵∴∵∴∵∴∵

Answer:

False

Explanation:

Paleobotany is the study of fossil plants.

Answer:

false

Explanation:

The Principle of Superposition in geology tells us that deeper strata are older than strata above them. Starting from top to bottom, the sequence in this case would be: forest-cover layer, topographic layer, standing water layer, flowing water layer, boundary layer, and road layer. This concept is also applied in physics' ABC packing where the sequence of A-B-C identifies A as newest and C as oldest.

In geology, the principle of superposition can be used to determine the age of different layers or strata. It states that strata that are deeper are older than strata above them. For example, if we are looking at the layers mentioned, we start from the top layer which is the most recent, and go down to the bottom layer which is the oldest.

Starting with a forest cover layer (light green) as the youngest strata. Overlaying it is the topographic layer (contour lines), followed by a standing water layer (pond, lake). Next is a flowing water layer (stream, river), then the boundary layer, and the oldest identified layer is the road layer on top. We could refer to figure 2.3 that shows objects on deeper strata (like the pottery fragments in Stratum E) are older than those above (like the shell buttons in Stratum C).

In similar manner, layer representation is used in ABC packing. Here, the sequence of layers is A-B-C-A-B-C-A-B-C... with A being the newest and C being the oldest.

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Answer:

Explanation:

100 % increase makes an amount 2 times .

44 % increase = 42 MJ

100 % increase = 95.45 MJ

final kinetic energy = 2 x 95.45 MJ

= 190.9 x 10⁶ J

1/2 m v² = 190.9 x 10⁶

.5 x m x 9² = 190.9 x 10⁶

m = 4.71 x 10⁶ kg

= 4710 metric ton .

Answer:

The maximum speed of the mass is 1.67 m/s.  

Explanation:

We have,

Mass of object is 34 g or 0.034 kg

Spring constant of the spring is 78.1 N/m

Amplitude attained by the object is 3.5 cm or 0.035 m

It is required to find the maximum speed of the object in this spring mass system. The maximum speed is given by :

[tex]v=A\omega[/tex]

[tex]\omega=\sqrt{\dfrac{k}{m}}[/tex]

[tex]v=A\sqrt{\dfrac{k}{m}}[/tex]

Plugging all the values in above formula,

[tex]v=0.035\times \sqrt{\dfrac{78.1}{0.034}}\\\\v=1.67\ m/s[/tex]

So, the maximum speed of the mass is 1.67 m/s.  

Final answer:

The maximum speed of a 34-g object bouncing on a spring with an amplitude of 3.5-cm is 0.335 m/s.

Explanation:

To find the maximum speed of the object, we need to first calculate the maximum potential energy stored in the spring, and then convert it to kinetic energy. The formula for the potential energy stored in a spring is given by:

PE = (1/2)kx²

Where PE is the potential energy, k is the force constant of the spring, and x is the amplitude. In this case, the amplitude is 3.00 cm, or 0.03 m, and the force constant of the spring is 1.25 N/m. Substituting these values, we get:

The maximum kinetic energy is equal to the maximum potential energy:

The maximum speed of the object can be calculated using the formula:

v = √(2KE/m)

Where v is the maximum speed, KE is the maximum kinetic energy, and m is the mass of the object. In this case, the mass of the object is 0.0100 kg. Substituting these values, we get:

Therefore, the maximum speed of the object bouncing on the spring is 0.335 m/s.

To create a retroreflector with two mirrors that reflects a laser beam by 180 degrees, the mirrors should be arranged at a 90-degree angle to form a corner reflector. The light reflects off each mirror at the same angle it arrived, resulting in the beam retracing its path back.

To design a retroreflector with two mirrors that reflects a laser beam by 180 degrees independent of the incident direction, the angle between the two mirrors should be precisely 90 degrees. This configuration creates a corner reflector. When a beam of light strikes one mirror, it reflects off at the same angle it arrived but on the opposite side of the normal (per the Law of Reflection). The beam then strikes the second mirror, which is perpendicular to the first, and it once again reflects off at an angle equal to its incident angle relative to the normal of the second mirror. Because the mirrors are at a 90-degree angle to each other, the two reflections combined result in the light retracing its path back, creating a 180-degree reflection.

Retroreflectors are commonly used for this purpose because they ensure the reflected light beam is always parallel to the incoming light, regardless of where it strikes the reflector. This characteristic is critical in applications like road signs and bicycle reflectors, where visibility from various angles is essential.

Answer:

B they carry out functions that sustain life such as respiration

The observations that provides evidence that the smaller parts of living things, and not the non-living things, are cells is D. cannot be seen with the unaided eye but require a microscope.

Cells are the smallest units of life and they are too small to be seen with the eye. They can only be seen with a microscope. So, the observation that the smaller parts of living things cannot be seen with the unaided eye but require a microscope is evidence that they are cells.

The other options are not correct. Option A, tightly packed together with almost no space between them, is not specific to cells. Many non-living things, such as sand, are also tightly packed together. Option B, carry out functions that sustain life such as respiration, is also not specific to cells. Option C, are uniform in size and structure, is not always true for cells. Cells can vary in size and structure depending on their function.

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The force which produces the type of energy shown by the X in the diagram is electromagnetic. The second option is correct.

The electromagnetic wave is the white light or Sunlight coming directly from the Sun. This light ray is the form of wave. This light when falls on any object segregates into the range of all types of EM radiation.

Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.

The image shows a working flashlight.

The force which produces the type of energy shown by the X in the diagram is electromagnetic

Thus, the second option is correct.

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Answer:

Spring constant, k = 49 N/m    

Explanation:

It is given that,

Mass that is attached to the spring is 0.5 kg

Due to this mass, the spring stretches a  distance of 0.1 meter.

We need to find the spring constant of this spring. When the spring is attached to the spring, the force on spring is balanced by its weight such that,

[tex]mg=kx[/tex]

k is spring constant

[tex]k=\dfrac{mg}{x}\\\\k=\dfrac{0.5\times 9.8}{0.1}\\\\k=49\ N/m[/tex]

So, the spring constant of the spring is 49 N/m.

Answer:

Force, F = 1496.31 N

Explanation:

We have,

Charge, Q = 0.86 C

Electric field, E = 1739.90 N/C

It is required to find the force applied to a charge. When an object is placed in the electric field, it will posses electric force. The electric force acting on the charge is given by :

[tex]F=qE[/tex]

[tex]F=0.86\ C\times 1739.90\ N/C\\\\F=1496.31\ N[/tex]

So, the force applied to the charge is 1496.31 N.

When using a scale of 1 inch equals 100,000 miles, the distance from the Sun to Pluto is about 36,700 inches, or over half a mile, making it much longer than any of the given comparison objects.

The distance from the Sun to Pluto averages about 3.67 billion miles (5.9 billion kilometers). When creating a scale model of the solar system, if we use the scale where 1 inch equals 100,000 miles, we can calculate the distance from the Sun to Pluto in inches to find out how long it would be in our scaled representation.

First, we convert the distance of 3.67 billion miles to inches on our scale. To do this, divide the distance by the scale factor:

3.67 billion miles / 100,000 = 36,700 inches

To give a more tangible visualization, 36,700 inches is approximately 3,058.33 feet, or roughly 0.58 miles. So, in our scale model, the distance from the Sun to Pluto would be over half a mile long! Clearly, none of the provided options (a peanut, a pinhead, an 8 inch wide ball, a 2 inch marble) are remotely large enough to represent this distance accurately.

Answer:

B. The emission of high-energy particles or waves from atoms

Explanation:

Answer:

its B

Explanation: i searched it up...

The Law of Triads, proposed by Johann Dobereiner, grouped elements into triads based on similar properties, with an example being the triad of lithium, sodium, and potassium. The correct answer is B: Elements were arranged in groups of three.

The Law of Triads was an early attempt to categorize elements based on their properties by grouping them in sets of three with similar characteristics. Answer to the student's question is B: Elements were arranged in groups of three. This concept was proposed by the German chemist Johann Dobereiner in 1829. Dobereiner noticed patterns among certain groups of three elements (triads) such as lithium, sodium, and potassium as well as chlorine, bromine, and iodine. He found that the atomic masses of the lightest and heaviest elements in a triad, when averaged, were close to the atomic mass of the middle element, and these triads also had similar chemical reactions. However, this system had limitations as it could not categorize all known elements. Today, we recognize that portions of the periodic table, particularly the d-block, have triads of elements with substantial similarities. The periodic table has since evolved to arrange elements in increasing order of atomic numbers, forming periods and groups that reflect periodic functions of their atomic numbers.

Answer:

the true statement would be your second box, the one that says "in the year 1500, there are more than 2 billion people on Earth."

The line that represents the population on the graph stays constant, therefore, there is not a rise or decrease. That is why all the other three boxes are false.

Explanation: