A training pyramid increases general physical preparedness, facilitating foundational strength and reducing the risk of injury. the purpose of the model is to build a strong foundation over time, eliminating any structural deficit the lifter may possess.
a) true
b) false

Answer:

have two or more paths

Explanation:

A parallel circuit is one that has two or more paths for the electricity to flow, the loads are parallel to each other.

The kinetic energy of the crate as it reaches the lower surface is 80 J

Kinetic energy is the energy possed by an object in motion. Mathematically, the kinetic energy can be expressed as follow:

KE = ½mv²

With the above formula, the kinetic energy of the crate can be obtained as follow:

KE = ½mv²

KE = ½ × 10 × 4²

KE = 5 × 16

KE = 80 J

Therefore, the kinetic energy of the crate is 80 J

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'In a chemical reaction, mass is neither created nor destroyed' is the correct answer.

What is Law of conservation of mass ?

The law of conservation of mass, also known as Lavoisier's law, states that in a closed system, the total mass of the system remains constant over time, regardless of the chemical reactions or physical changes that may occur within the system. This means that the total mass of the reactants and products in a chemical reaction must always be equal. The law of conservation of mass is one of the fundamental principles of chemistry and is based on the idea that matter cannot be created or destroyed, only transformed from one form to another. It is a cornerstone of modern chemistry and is used as a basis for many important chemical concepts and theories, such as stoichiometry and chemical equilibria.

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Answer:

Emphasis on public safety can surely reduce the risk for various groups of population

1. Proper education and training must be provided to make them aware of the risks and how they can manage those risks.

2. Proper rules and regulation must be made and strictly followed for example traffic rules so as to avoid accidents.

3. Disaster management teams should to formed to ensure minimal loss of humans and resources during any natural calamity.

4.Eradication of poverty and illiteracy should be priority so as to ensure people focus on more important issues in life rather than involve themselves in trivial things.

Explanation:

Mass is constant independent of location or gravity. On Mars or Jupiter, you would have the same mass as you have on Earth. Gravity causes your weight to differ on other worlds.

MASS: The entire amount of matter contained in a thing is referred to as its mass. The inertia of an item may be used to calculate its mass. The mass of an item is constant in all locations. It remains unchanged even when the value of 'g' equals 0.

WEIGHT: The gravitational force by which the earth draws an item is referred to as weight. We may calculate weight using the formula W=m(mass)*g (acceleration due to gravity). It varies depending on where you go (variable). If the value of g is zero everywhere, the object's weight becomes zero.

Here,

The object's mass is constant. As a result, the mass would be the same on Earth and Mars. However, when it comes to weight, it will undoubtedly differ. Weight is determined by the value of g, and the values will differ in both locations.

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Explanation:

On a position vs time graph (x vs t), displacement is the difference in positions (Δx = x₂ − x₁).

On a velocity vs time graph (v vs t), displacement is the area under the graph (Δx = ∫ v dt).

Answer:

At the top of the roller coaster, there is a lot of potential energy. When it comes to the bottom, the roller coaster loses its potential energy and gains kinetic energy as it is going very fast here.

The kinetic energy of a roller coaster as it approaches its lowest point will be maximum and loses its potential energy.

The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.

According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.

Total energy = kinetic energy+potential energy

Potential energy is due to the position.While the kinetic energy is due to the velocity.

There is a maximum potential energy at the top of the roller coaster. As it nears the bottom, the roller coaster loses potential energy and acquires kinetic energy due to the high speed.

Hence,the energy of the body by the virtue of its motion is known as the kinetic energy of the body

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Answer:

x= 100 m

Explanation:

m= 600 kg

t= 10 s

F= 1200N

v0= 0

-----

F=ma

a=F/m

x= (v0)t + (1/2)(a)(t^2)

x= (1/2)(F/m)(t^2)

x= (1/2)(1200/600)(10^2)

x= 100m

The enthalpy of vaporization as determined from the different temperatures is  23.6 kJ/mol.

The enthalpy of vaporization has to do  with the heat that is given out when a substances is converted from liquid to vapor under standard conditions.

We can use te formula;

ln(P2/P1) = -ΔHvap/R(1/T2 - 1/T1)

P2 = final pressure

P1 = initial pressure

ΔHvap = enthalpy of vaporization

T2 = final temperature

T1 = initial temperature

Then;

ln(135/24.3) = -ΔHvap/8.314 (1/325 - 1/273)

1.7 =  -ΔHvap/8.314 (0.0031 - 0.0037)

1.7 =  -ΔHvap/8.314 (-0.0006)

1.7 = 0.0006ΔHvap/8.314

To obtain the enthalpy of vaporization here;

ΔHvap = 1.7 * 8.314/0.0006

= 23.6 kJ/mol

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Answer:

λ = 6,108 10⁻⁷ m = 610.8 nm

λ = 5.513 10⁻⁷ m = 551.3 nm

Explanation:

Young's double slit experiment results in a pattern consisting of maxima and minima of interference, the maximums are described by the expression

          d sin θ = m λ

where d of the distance between the two slits, θ is the angle from the central maximum to the given interference line, λ the wavelength of the radiation and an integer indicating the order of interference

In this exercise they give us several conditions

The first

the angle is 1.12º to the maximum m = 8

the distance between the slits d = 0.000250 m

of the initial equation

           λ = d sin θ / m

           λ = 0.000250 sin 1.12 / 8

           λ = 6,108 10⁻⁷ m = 610.8 nm

The second

the distance from the slits to the screen is L = 302.0 cm = 3.020 m

the distance from the central maximum is y = 3.33 cm = 0.0333 m for interference m = 5

in this case we use that the angle in the experiment is small

      tan θ = y / L

      tan θ = sin θ / cos θ = sin θ

we substitute

       sin θ = y / L

       d y / L = m λ

       λ = d y / L m

we calculate

       λ = 0.000250 0.0333 / (3,020 5)

       λ = 5.513 10⁻⁷ m = 551.3 nm

Answer:

the answer is letter D.

Explanation:

i hope this is help

Answer:

great answer warstep8! add me on disc colludy#8415

Explanation:

Answer:

Both A and C

Explanation:

I just got it correct on Edg

Answer:

A and C is incorrect the real answer is B

Explanation:

One of the frequencies used to transmit and receive cellular telephone signals in the United States is 850 MHz. 0.353m or 35.3cm is the wavelength in meters of these radio waves.

A waveform signal that’s carried in space or down a wire has a wavelength, which is that, the separation between two identical places (adjacent crests) in the consecutive cycles. This length is usually defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm). The meter, commonly abbreviated as m, is that the SI unit for wavelength. The multiples or fractions of a meter are also used to measure wavelength.

The wavelength of sunshine is a crucial characteristic since it establishes the nature of the light. Green light features a wavelength that is different from both of them, while red light features a wavelength that is different from blue light. The longest wavelengths are found in gamma rays. The light with the longest wavelength is red, which is at one extreme of the spectrum. The wavelength of blue or violet light is that the shortest. All of the colors in the color spectrum are combined to create white light.

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Answer:

E.) Sound Waves are an example of longitudinal waves.

Explanation:

I was sure either A or E was correct so I had to look it up. In reference to three sources, it is proven that sound waves are longitudinal. Therefore, without a doubt, I would try to go with E. I know D is wrong as well as B most definitely. That is because sound always requires a medium to travel through in order to be heard; additionally sounds don't necessarily have to be a certain rate of loudness in order to be considered of different quality. Therefore leaving you with A, C, or E. Additionally C is a false fact as well. So I highly suggest choosing E because there is sufficient sources to prove that. I'll provide a direct link down below.

https://www.bing.com/search?q=are+sound+waves+longitudinal+waves&cvid=fc17d9f3f744496da334cf10a7daad57&aqs=edge..69i57l2j69i60j5j69i61j69i60l2.5395j0j1&pglt=2339&FORM=ANNTA1&PC=NMTS

The correct statement is sound waves are an example of longitudinal waves.

In a longitudinal wave, the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky. We can make a horizontal longitudinal wave by pushing and pulling the slinky horizontally.

Sound is a longitudinal wave that alternately compresses and decompresses the component particles of the medium through which it travels.

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Pressure and force are related concepts in physics. Force is the amount of push or pull that an object experiences, and it is measured in units of Newtons (N).

Pressure is the force per unit area, and it is measured in units of Pascals (Pa) or pounds per square inch (psi). This means that pressure is calculated by dividing the force by the area over which it is applied. Mathematically, pressure = force / area. Therefore, if the force applied to a given area is increased, the pressure will also increase, and vice versa. This relationship is important in many areas of physics and engineering, such as fluid mechanics and material strength analysis.

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Answer:

Double-replacement

Explanation:

2Li + CaCl2 → 2LiCl + Ca O

D. Double-replacement

The speed of the other object formed is 4.8 m/s.

The change in kinetic energy is 9.84 J.

Mass of the first object, m₁ = 3 u

Velocity of the first object, v₁ = 0.8 c

Mass of the second object, m₂ = 4 u

Velocity of the second object, v₂ = 0.6 c

Mass of the object at rest, m' = 6 u

a) According to the conservation of momentum,

m₁ + m₂ = m'+ m

So, m = (3 + 4) - 6

m = 7 - 6 = 1 u

m₁v₁ + m₂v₂ = (m x v) + (m' x v')

(3 x 0.8) + (4 x 0.6) + (1 x v) + (6 x 0)

Therefore, the speed of the other object formed is,

v = 2.4 + 2.4

v = 4.8 m/s

b) The change in kinetic energy is given by,

E = KE - (KE₁ + KE₂)

E = 1/2mv² - (1/2m₁v₁² + 1/2m₂v₂²)

E = 1/2(mv² - m₁v₁² - m₂v₂²)

E = 1/2[(1 x (4.8)² - 3 x (0.8)² - 4 x (0.6)²]

E = 1/2(23.04 - 1.92 - 1.44)

E = 1/2 x 19.68

E = 9.84 J

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The impact speed will be

v^2 = 2*9.8*1.3

v^2 = 25.48

v= 5.04 m/s or O C. 5.0 m/s

Answer:

n =1.33 revolutions

Explanation:

Uniform Circular Motion

The angular speed can be calculated in two different ways:

\(\displaystyle \omega=\frac{v}{r}\)

Where:

v = tangential speed

r = radius of the circle described by the rotating object

Also:

\(\omega=2\pi f\)

Where:

f = frequency

Solving for f:

\(\displaystyle f=\frac{\omega}{2\pi}\)

Since the frequency is calculated when the number of revolutions n and the time t are known:

\(\displaystyle f=\frac{n}{t}\)

We can solve for n:

n=f.t

The particle moves in a circle of r=90 m with a speed v=25 m/s. Thus the angular speed is:

\(\displaystyle \omega=\frac{25}{90}\)

\(\displaystyle \omega=0.278\ rad/s\)

Now we calculate f:

\(\displaystyle f=\frac{0.278}{2\pi}\)

\(f=0.04421\ Hz\)

Calculating the number of revolutions:

n = 0.04421*30

n =1.33 revolutions

Explanation:

F=ma

500N=10×a

a=500÷10=50m/s²

PLEASE GIVE BRAINLIEST

Answer:

50m^2

Explanation:

acceleration=f/m

Answer:

\(1.2\; {\rm N}\), assuming that all other forces on this crab were balanced.

Explanation:

The impulse \(J\) on an object is equal to the change in momentum \(\Delta p\). In other words:

\(J = \Delta p\).

If the mass \(m\) of the object stays the same (as in the case of this question), the change in momentum can be rewritten as:

\(J = \Delta p = m\, \Delta v\), where \(\Delta v\) is the change in velocity.

Impulse is also equal to the net force on the object \(F_{\text{net}}\) times the duration \(\Delta t\) over which the force is applied:

\(J = F_{\text{net}}\, \Delta t\).

Equate the two expressions for \(J\) to obtain:

\(F_{\text{net}}\, \Delta t = m\, \Delta v\).

In this question:

Rearrange \(F_{\text{net}}\, \Delta t = m\, \Delta v\) and solve for the net force \(F_{\text{net}}\):

\(\begin{aligned}F_{\text{net}} &= \frac{m\, \Delta v}{\Delta t} \\ &= \frac{(3\; {\rm kg})\, (2\; {\rm m\cdot s^{-1}})}{5\; {\rm s}} \\ &= 1.2\; {\rm kg \cdot m\cdot s^{-2}} \\ &= 1.2\; {\rm N}\end{aligned}\).

Assuming that all other forces on this crab are balanced, the net force on the crab would be equal to the force from the tide. Hence, the tide would have pushed the crab with a force of \(1.2\; {\rm N}\).

The maximum electromotive force induced in the coil by the generator is 56.45 V.

emf(max) = NAB/t

where;

Substitute the given parameter and solve for maximum electromotive force induced in the coil.

Area of the loop = 0.0462 m x 0.0462 m = 0.00213 m²

emf(max) = (353 x 0.00213 x 0.991) / (13.2 x 10⁻³)

emf(max) = 56.45 V

Thus, the maximum electromotive force induced in the coil by the generator is 56.45 V.

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The amount of distance an object travels in a given length of time is measured as velocity.

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Answer:

True

Explanation:

mass, length, time, electric current, temperature, luminous intensity and amount of substance

Yes, it will be safe to have the turbine component operate at 1150°C

Based on the given information, the melting temperatures of iron and titanium are 1538°C and 1668°C, respectively. In an iron-titanium alloy, these two elements are combined, resulting in an intermediate melting temperature. This alloy would have a higher melting temperature than pure iron and lower than pure titanium.

Operating the turbine engine at 1150°C would be safe, as this temperature is significantly below the melting temperatures of both elements. It provides a sufficient margin of safety for the alloy, ensuring that it remains solid and stable during operation. Additionally, alloys typically have improved mechanical properties, such as increased strength and resistance to wear, compared to their constituent elements. This makes iron-titanium alloys suitable for high-temperature applications like turbine engines.

In summary, using an iron-titanium alloy for a turbine engine operating at 1150°C should be safe and appropriate due to its enhanced mechanical properties and melting temperature range.

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Answer:

its 240

Explanation:

It does not change

Answer: 25

Explanation:

The kinetic energy of the object moving at the given mass and velocity is 25 J.

The given parameters;

The kinetic energy of the object moving at the given mass and velocity is calculated as follows;

K.E = ¹/₂mv²

K.E = ¹/₂ x 50 x 1²

K.E = 25 J

Thus, the kinetic energy of the object moving at the given mass and velocity is 25 J.

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Answer:

C

Explanation:

thats what i think it depends on the amount of force someone dropped the ball with.

Answer: A) "Less than 60 centimeters, as the ball transforms a part of its potential energy into heat energy"

Explanation:

I took the test

The maximum amount that should be spent on the corrosion-resistant tunnel is $38,500.

To calculate the maximum amount that should be spent on the corrosion-resistant tunnel directly:

For the normal steel tunnel:

Initial cost: $45,000

Annual maintenance cost: $1,000

Depreciation expense: ($45,000 - $0) / 15 = $3,000 per year

After-tax cost: $1,000 + ($3,000 - $1,000) × (1 - 0.4) = $1,600 per year

For the corrosion-resistant steel tunnel:

Annual maintenance cost: $100

Depreciation expense: X / 15 per year

After-tax cost: $100 + (X/15 - $100) × (1 - 0.4) = 0.6X/15 + $60 per year

We want to find the maximum X for which the annual after-tax cost of the corrosion-resistant tunnel is less than or equal to $1,600:

0.6X/15 + $60 ≤ $1,600

Now, let's solve this inequality to find the maximum value of X:

0.6X/15 ≤ $1,600 - $60

0.6X/15 ≤ $1,540

0.6X ≤ $1,540 * 15

0.6X ≤ $23,100

X ≤ $23,100 / 0.6

X ≤ $38,500

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Expressing the answer using three significant figures, the total annual amount of incoming energy on Earth is approximately 1.74×10¹⁹ Watts.

To calculate the total annual amount of incoming energy on Earth, it is required to consider the solar constant, which represents the amount of solar energy received per unit area outside the Earth's atmosphere. The solar constant is approximately 1361 Watts per square meter (W/m²).

First, it is required to convert the Earth's cross-sectional area from cm² to m².

1.28×10¹⁸ cm² = 1.28×10¹⁶ m²

Total annual incoming energy = Solar constant × Earth's cross-sectional area

Total annual incoming energy = 1361 W/m² × 1.28×10¹⁶ m²

Total annual incoming energy ≈ 1.74×10¹⁹ Watts

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