An athlete gains 300J of KE when running at 3m/s. Find the mass of the athlete.

Answer:

consistently working out and eating healthy i guess

Explanation:

Answer:

To have a strong body (not only visible muscles). Physically fit is to eat well also. Eat healthy more! Your body might not be packin, but it sure is strong!

Explanation:

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Crest is the part of the wave which does this.

A sound wave is the sample of disturbance resulting from the movement of strength visiting through a medium, including air, water or every other liquid or stable remember as it propagates far from the supply of the sound.

The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. because the supply continues to vibrate the medium, the vibrations propagate far from the supply at the rate of sound, hence forming the sound wave.

A sound wave is not a transverse wave with crests and troughs, however alternatively a longitudinal wave with compressions and rarefactions.

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Answer:

B

Explanation:

Nonmetal is better insulator than metals

Answer:

B

Explanation:

Just took the quiz.

A ball is kicked horizontally and reaches a maximum height of 6.0 m. The ball is suspended from a ceiling by a string of length 7.5 m. initial speed of the ball as it is kicked is approximately 5.186 m/s.

Since the ball is kicked horizontally, its initial vertical velocity is zero. The maximum height reached by the ball occurs when its vertical velocity becomes zero again. Using the equation for vertical displacement in free fall motion:

Δy = v₀y * t + (1/2) * g * t², where Δy is the vertical displacement, v₀y is the initial vertical velocity, t is the time, and g is the acceleration due to gravity. For the ball at maximum height, Δy = 6.0 m, v₀y = 0, and g = 9.8 m/s². Plugging in these values, the equation becomes: 6.0 = 0 + (1/2) * 9.8 * t².

Simplifying the equation, we find: 3.0 = 4.9 * t². Solving for t, we get: t² = 3.0 / 4.9. t = 0.7828 s.

Since the ball was kicked horizontally, its initial speed is equal to the horizontal distance traveled divided by the time taken. Using the Pythagorean theorem, the horizontal distance traveled is given by: d = √(L² - Δy²),

where L is the length of the string and Δy is the maximum height. d = √(7.5² - 6.0²). d ≈ 4.057 m. Therefore, the initial speed of the ball is approximately: v₀ = d / t. v₀ = 4.057 / 0.7828. v₀ ≈ 5.186 m/s.

Thus, the initial speed of the ball as it is kicked is approximately 5.186 m/s.

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While accelerating at a constant rate from 12.0 m/s to 18.0 m/s, a car moves over a distance of 60.0 m. The time taken by the car will be 4 seconds. the correct answer is option(c).

When acceleration is constant, the rate of change in velocity is also constant. In the absence of any acceleration, velocity remains constant. When acceleration is positive, velocity becomes more significant.

Let a denote acceleration, u denote initial velocity, v denote final velocity, and t denote time.

The equation of motion is stated as,

v = u + at

v² = u² + 2as

A car travels across a distance of 60.0 m while accelerating constantly from 12.0 m/s to 18.0 m/s.

Then the time taken by the car will be,

u = 12 m/s

v = 18 m/s

s = 60 m

Put these in the equation v² = u² + 2as.

18² = 12² + 2 x a x 60

a = 1.5

Then the time will be

18 = 12 + 1.5t

1.5t = 6

t = 4 seconds

Hence, the time taken is 4 s.

The complete question is:

While accelerating at a constant rate from 12.0 m/s to 18.0 m/s, a car moves over a distance of 60.0 m. How much time does it take?

1.00 s

2.50 s

4.00 s

4.50 s

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Answer:

B

Explanation:

Answer:

B

Explanation:

The areas of physics involved in each of the following tests of lightweight metal alloy proposed for use in sailboat hulls are as follows:
a. Testing the effects of a collision on the alloy - The area of physics involved in this test is mechanics, specifically the study of forces and motion.
b. Testing the effects of extreme heat and cold on the alloy - The area of physics involved in this test is thermodynamics, specifically the study of heat and temperature and their relation to energy and work.
c. Testing whether the alloy can affect a magnetic compass needle - The area of physics involved in this test is electromagnetism, specifically the study of the relationship between electricity and magnetism.

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(A) The amount of charge that passes through the battery during the start is 23 C.

(B) If the emf is doubled to 24 V, the amount of charge passing through the battery will decrease.

Part A:
The equation for work done by a battery is W = QV, where W is the work done, Q is the charge, and V is the emf of the battery. We can rearrange this equation to solve for the charge:
Q = W/V
Plugging in the given values:
Q = 270 J / 12 V
Q = 22.5 C
However, we need to express our answer using two significant figures, so we round to 23 C. Hence, the amount of charge is 23 C.

Part B:
The amount of charge passing through the battery will decrease when the emf is doubled to 24 V. This is because the equation Q = W/V shows that the charge is inversely proportional to the emf. If the emf increases, the charge will decrease, and vice versa.

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The position when velocity is 4.5cm/s is ±3.05cm and the velocity when the position is 1.6cm/s is 12.99cm.

The maximum velocity of the particle is 15cm/s and the amplitude is 3.2cm.

The velocity of a particle in simple harmonic motion is given by

V = W√(A²-X²)

Where,

V is the velocity,

A is the amplitude,

X is the position,

W is the angular frequency.

So, for maximum velocity,

V = WA

Putting values,

15 = W(3.2)

W = 4.6875 rad/s

(a) For position when speed is 4.5cm/s.

Putting values,

(4.5) = 4.6875√((3.2)²-(X²))

X = ±3.05cm

So, at ±3.05cm, the velocity will be 4.5cm/s.

(b) For velocity at position of 1.6cm,

Putting values,

V = 4.6875√((3.2)+(1.6))

V = 12.99cm/s

So, the velocity is 12.99cm/s at 1.6cm

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Answer:

Waves are most commonly caused by wind.

Explanation:

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest.

The work required to pump all the water over the side of the circular swimming pool having a diameter of 16 m and height of 4 m is 23,644852 joules.

To calculate the amount of work required to pump all the water over the side, we need to find the volume of water in the pool first.

The pool is circular, so we can use the formula for the volume of a cylinder:

The volume of water \(= \pi r^2h\)

where r is the radius of the pool and h is the depth of the water.

The diameter of the pool is 16 m, so the radius is half of that or 8 m. The depth of the water is 3 m.

Therefore, the volume of water in the pool is:

Volume of water \(= \pi (8 \ m)^2(3\  m) = 603.18 \ m^3\)

To pump all of the water over the side, we need to raise it to a height of 4 m (the height of the sides of the pool).

The potential energy required to raise an object of mass m to a height h is given by the formula:

Potential energy = mgh

where g is the acceleration due to gravity, which is approximately \(9.8\ m/s^2\).

The mass of the water is given by its density (which is approximately \(1000 \ kg/m^3\)) times its volume:

Mass of water = density x volume = \(1000 \ kg/m^3 \times 603.18 \ m^3 = 603185 \ kg\)

So the amount of work required to pump all of the water over the side is:

Potential energy = mgh \(= 603185 \ kg \times 9.8 \ m/s^2 \times 4 \ m = 23,644852 \ J\).

Therefore, it would take approximately 23,644852 J million joules of work to pump all of the water over the side of the pool.

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Answer:

Earth

Explanation:

The sun and the moon come together and they seem like one bonded.

The wavelength of the blue light emitted by a mercury lamp with a frequency of\(6.88 × 10^14 s^-1\) is 436.6 nm.

The wavelength of the blue light emitted by the mercury lamp can be calculated using the equation λ = c/ν, where λ is the wavelength, c is the speed of light (\(3.00 × 10^8 m/s\)), and ν is the frequency of the light. First, the frequency of the light is converted to hertz by multiplying 6.88 × 10^14 s^-1 by 1 Hz/1 s, giving a frequency of \(6.88 × 10^14 Hz\). Then, the frequency is plugged into the equation,\(λ = 3.00 × 10^8 m/s ÷ 6.88 × 10^14 Hz\), and the answer is converted from meters to nanometers by multiplying by \(10^9\), resulting in a wavelength of 436.6 nm for the blue light emitted by the mercury lamp.

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Answer: 10^5

Explanation:

D

This is because if everything else is equal, increasing the resistance will decrease the current in a circut.

If everything else is equal, increasing the resistance will decrease the current in a circuit. Therefore option D is correct.

In a circuit, the resistance refers to the opposition encountered by the flow of electric current. According to Ohm's law, the current (I) in a circuit is inversely proportional to the resistance (R) and directly proportional to the voltage (V).

Therefore, if everything else remains equal and the resistance is increased, the current will decrease. This relationship can be explained by the formula I = V/R, where an increase in resistance (R) leads to a decrease in current (I) for a given voltage (V).

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A pump with a displacement of 65 cc/rev has a mechanical efficiency of 0.93. When the outlet pressure is 18.1 MPa, the actual torque is 11709.5 N-m.

Torque is a force on a rotating axis that can cause an object to move in a circle or rotate. Torque is also known as the moment of force. Any force whose direction does not stop at the axis of rotation of the object or the object's point of mass can be said to give torque to the object.

To calculate the actual torque (in N-m) when the outlet pressure is 18.1 MPa for a pump with a displacement of 65 cc/rev and a mechanical efficiency of 0.93, you can use the formula

Torque = Pressure x Displacement / Efficiency.

Using this formula, the actual torque would be equal to

Torque =  18.1 MPa x 65 cc/rev / 0.93

Torque = 1709.5 N-m.

So, torque is 1709.5 N-m

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If you increase the frequency of a sound wave four times, the speed will increase four times. The correct option is A.

Particles that are vibrating make up sound waves. These collide with other particles, causing them to vibrate, which allows the sound to escape the source.

Your ear drums vibrate as a result of air vibrations, which allows you to perceive sound. This vibration is transformed into messages, which proceed to your brain via a nerve.

When sound is produced, air molecules shake and collide, causing vibrations to travel between air molecules. The sound is transmitted by the vibrating particles, which also cause the ear drum to vibrate.

A sound wave's frequency can be increased four times without increasing its speed.

Thus, the correct option is A.

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The bike rider's average velocity is 1.5m/s in the northwest direction. This means that on average, the rider covers a distance of 1.5 meters every second in the northwest direction.

The magnitude of the average velocity can be determined by finding the total displacement and dividing it by the total time taken. In this case, the bike rider travels 75m toward the west and 75m toward the north, resulting in a total displacement of 75m in the northwest direction.

To find the average velocity, we need to calculate the total time taken. Since the distance traveled in each direction is the same and the speed is constant at 1.5m/s, we can divide the total distance by the speed to find the total time. In this case, 75m / 1.5m/s = 50s.

Next, we divide the total displacement (75m) by the total time (50s) to find the average velocity. 75m / 50s = 1.5m/s.

Therefore, the magnitude of the average velocity is 1.5m/s.

In summary, the bike rider's average velocity is 1.5m/s in the northwest direction. This means that on average, the rider covers a distance of 1.5 meters every second in the northwest direction.

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The magnitude of the force on the wire is 1.9 × 10⁻⁴ N. The direction of the current is 50° south of the west. 1.9×10 N⁻⁴, out of the Earth's surface is the correct option.

Length of the horizontal wire, L = 3.0 m

Current flowing through the wire, I = 6.0 A

Earth's magnetic field, B = 0.14 × 10⁻⁴ T

Angle made by the current direction with due west = 50° south of westForce on a current-carrying wire due to the Earth's magnetic field is given by the formula:

F = BILsinθ, where

L is the length of the wire, I is the current flowing through it, B is the magnetic field strength at that location and θ is the angle between the current direction and the magnetic field direction

Magnitude of the force on the wire is

F = BILsinθF = (0.14 × 10⁻⁴ T) × (6.0 A) × (3.0 m) × sin 50°F = 1.9 × 10⁻⁴ N

Earth's magnetic field is due north, the direction of the force on the wire is out of the Earth's surface. Therefore, the correct option is 1.9×10 N⁻⁴, out of the Earth's surface.

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The change in gravitational potential energy of the ball is approximately 7.0 kg m²/s² when it is lifted off the floor a distance of 1/7 m.

The change in gravitational potential energy of an object is given by the formula ΔPE = mgh, where ΔPE represents the change in potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the change in height.

In this case, the mass of the ball is 5.0 kg and the change in height is 1/7 m. The acceleration due to gravity, g, is approximately 9.8 m/s².

To calculate the change in gravitational potential energy, we can plug in the values into the formula:

ΔPE = (5.0 kg) x (9.8 m/s²) x (1/7 m)

Simplifying the expression:

ΔPE = (5.0 kg) x (9.8 m/s²) x (1/7 m)
   = (5.0 x 9.8 / 7) kg m²/s²

Calculating the value:

ΔPE ≈ 7.0 kg m²/s²

Therefore, the change in gravitational potential energy of the ball is approximately 7.0 kg m²/s².

Conclusion in one line:
The change in gravitational potential energy of the ball is approximately 7.0 kg m²/s² when it is lifted off the floor a distance of 1/7 m.

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Answer:

A. primary waves

Explanation:

To calculate the additional distance the buoy will sink when a man stands on top, we need to consider the change in buoyancy force and the additional weight added to the system.

The buoyancy force is equal to the weight of the fluid displaced by the buoy. In this case, since the buoy is floating vertically, the buoyancy force is equal to the weight of the buoy itself.

Buoyancy force = Weight of the buoy = Mass of the buoy * Gravitational acceleration

Buoyancy force = 1200 kg * 9.8 m/s^2 = 11,760 N

When the man stands on top of the buoy, his weight is added to the system. The additional weight is:

Additional weight = Mass of the man * Gravitational acceleration

Additional weight = 80 kg * 9.8 m/s^2 = 784 N

The additional weight will increase the total weight of the system, and consequently, the buoyancy force will also increase.

The additional distance the buoy will sink can be calculated using Archimedes' principle, which states that the buoyant force is equal to the weight of the fluid displaced by the object.

Additional distance = Additional weight / (Cross-sectional area * Fluid density)

The cross-sectional area of the buoy can be calculated using the diameter:

Cross-sectional area = π * (Diameter/2)^2 = π * (0.9 m / 2)^2

Assuming the fluid density of saltwater is 1025 kg/m^3, we can substitute the values into the equation:

Additional distance = 784 N / (π * (0.9 m / 2)^2 * 1025 kg/m^3)

Calculating the additional distance will provide the specific value based on the given dimensions and assumptions.

In summary, to find the additional distance the buoy will sink when a man stands on top, we consider the change in buoyancy force due to the added weight. By using Archimedes' principle, the additional distance can be calculated by dividing the additional weight by the cross-sectional area of the buoy multiplied by the fluid density.

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A chemical element with the symbol Be and atomic number 4 is known as beryllium. Beryllium is a solid at room temperature and is categorized as an alkaline earth metal. The molar mass of beryllium (atomic number 4) is 9.012 g/mol. Accordingly, if all 6.22x1023 Beryllium atoms were put together in a mole, they would weigh 9.012g on a triple beam balance.

The atomic mass unit serves as the unit of measurement for mass (amu). A mass unit of an atom is 1.66 x 10-24 gram. The mass of one nucleon, which can be either a single proton or neutron, is roughly equal to one unified atomic mass unit, which is numerically equivalent to 1 g/mol.

In the aircraft industry in particular, beryllium is employed in gears and cogs. A silvery-white metal is beryllium. It has a low density and is relatively soft. Gyroscopes, springs, electrical contacts, spot-welding electrodes, and non-sparking tools all use beryllium in alloys with copper or nickel.

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The statement that only hard scientists has the essential skill set to respond in times of crisis is True.

adjective. absolutely necessary; indispensable: Discipline is essential in an army. pertaining to or constituting the essence of a thing. noting or containing an essence of a plant, drug, etc. being such by its very nature or in the highest sense natural; spontaneous: essential happiness.

meanings of essential and nature all the animals, plants, rocks, etc. in the world and all the features, forces, and processes that happen or exist independently of people, such as the weather, the sea, mountains, the production of young animals or plants,  See more at nature.

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Answer:

70m/s2

Explanation:

acceleration is equal to force over mass,

a=4200/60

= 70m/s2

Magnetometers are frequently used to measure the Earth's magnetic field, conduct geophysical surveys, find different kinds of magnetic anomalies, and calculate the dipole moment of magnetic materials.

To measure the magnetic field at a specific location in space, a magnetometer, also known as a gaussmeter, is employed. The magnetic field's direction can also be measured by some devices. Since their invention in the middle of the nineteenth century, these devices have developed into precise, accurate measurement tools.

The magnetometer, also referred to as a magnetic sensor, is a vital sensor used in all kinds of aircraft and spacecraft to measure magnetic induction (magnetic field intensity).

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Answer:

a super massive blackhole

Answer:

The weight, on Earth, of a book with a mass of 1.5kg is 14.7N.

Explanation:

Hi there!

Weight of an object = mass (kg) × acceleration due to gravity (N/kg)

Plug in the given values using the g constant g = 9.8 N/kg:

W = 1.5 × 9.8 = 14.7 N

Answer:

Sound

Amplitude Wave

Pitch

Strenght

Explanation:

The magnitude of the force exerted on the 0.02 C point charge in a 400 N/C electric field is 8 N. It is important to note that the force is a vector quantity, meaning it has both magnitude and direction. In this case, the direction of the force would depend on the polarity of the charge and the direction of the electric field.

The magnitude of the force exerted on a point charge in an electric field can be determined using the formula:

F = q * E

Where: F is the force exerted on the charge, q is the magnitude of the charge, and E is the magnitude of the electric field.

In this case, the magnitude of the electric field is given as 400 N/C, and the magnitude of the point charge is 0.02 C.

Substituting these values into the formula, we get:

F = (0.02 C) * (400 N/C)

Calculating this, we find:

F = 8 N

Therefore, the magnitude of the force exerted on the 0.02 C point charge in a 400 N/C electric field is 8 N. It is important to note that the force is a vector quantity, meaning it has both magnitude and direction. In this case, the direction of the force would depend on the polarity of the charge and the direction of the electric field.

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