the human body needs time to accelerate and time to slow down. you might have more keyframes at the start and end--fewer in the middle.

Answer:

\(\large \boxed{\text{761 kJ}}\)

Explanation:

You calculate the energy required to break all the bonds in the reactants.

Then you subtract the energy needed to break all the bonds in the products.

                        N₂  +   O₂   ⟶         2NO

                     N≡N  + O=O ⟶       2O-N=O

Bonds:         2N≡N   1O=O        2N-O + 2N=O

D/kJ·mol⁻¹:     941      495           201      607

\(\begin{array}{rcl}\Delta H & = & \sum{D_{\text{reactants}}} - \sum{D_{\text{products}}}\\& = & 2 \times 941 +1 \times 495 - (2 \times 201 + 2\times 607)\\&=& 2377 - 1616\\&=&\textbf{761 kJ}\\\end{array}\\\text{The enthalpy of reaction is $\large \boxed{\textbf{761 kJ}}$}.\)

Answer:

H3PO4 + 5HCl → PCl5 + 4H2O

Explanation:

Answer:

v = 46.67 km/h

Explanation:

We will use the following formula throughout this numerical:

s = vt

where,

s = distance covered

v = speed

t =  time taken

FOR FIRST 30 km:

s = 30 km

v = 30 km/h

t = t₃₀ = ?

Therefore,

30 km = (30 km/h)(t₃₀)

t₃₀ = (30 km)/(30 km/h)

t₃₀ = 1 h

FOR TOTAL 100 km:

s = 100 km

v = 40 km/h (Average Speed)

t = total time = ?

Therefore,

100 km = (40 km/h)(t)

t = (100 km)/(40 km/h)

t = 2.5 h

FOR LAST 70 km:

s = 70 km

t₇₀ = t - t₃₀ = 2.5 h - 1 h = 1.5 h

v = v₇₀ = ?

Therefore,

70 km = v(1.5 h)

v = 70 km/1.5 h

v = 46.67 km/h

Answer: b) A positive charge is moved toward a positive charge.

Answer:

the final potential energy of this system is 3U0/10

Explanation:

We are given

charge at left end  and another test charge at point p

Potential energy is given by  = \(\frac{k*Q1*Q2 }{R}\)

where k is electrostatics constant = \(9 *10^9\)

Q1 = first charge , Q2=  test charge

R= distance between charges

potential at point p

U0 = k*Q1*Q2 /3 ⇒ kq1q2 = 3U0 ..............1

now the test charge moves to point R

using Pytahgoreou theorem

R(distance) = \(\sqrt{8^2 + 6^2}\) = 10

New Potential energy

U1 = kq1*q2 / 10

substituting  kq1q2 = 3U0 from 1

U1 = 3U0/10

So this is the final potential energy of this system.

Answer:

Anything that has mass and takes up space

Explanation:

A nickel atom has an atomic number of 28 and an atomic mass of 59. It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

The atom consists of matter that may be split without releasing electrical charges.

It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.

In the nucleus, proton and the neutron is existing. The condition of the atom to be electrically neutral is that the number of the proton and electron should be the same.

A nickel atom has an atomic number of 28 and an atomic mass of 59. In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle.

In that, condition, It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

Hence, option A is correct.

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The acceleration of the block, as it slides down the frictionless inclined plane, is approximately 5.15 m/s².

This is determined by the effect of gravity on the object as it descends the slope, adjusted for the incline angle. To calculate the acceleration of the block, we need to consider the component of gravity that acts along the direction of the incline. Gravity causes the block to accelerate down the incline. The component of gravity along the incline is given by g*sin(θ), where g is the acceleration due to gravity (9.81 m/s²), and θ is the incline angle (31.4 degrees). Plugging in these values, we find that the acceleration of the block down the incline is approximately 5.15 m/s². It's important to note that this calculation assumes the incline is frictionless, which allows the full component of gravity to accelerate the block.

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Answer:

Hey mate.....

Explanation:

This is ur answer....

A human has 4 types of teeth:-

--> 8 Incisors.

--> 4 Canines.

--> 8 Premolars.

--> 12 Molars (including 4 wisdom teeth)

Hope it helps!

Mark me brainliest....

FOLLOW ME! :)

Answer:

there are four types of teeth's in humans

these four are as follows :-

hope it helps

The type of collision is elastic collision.

An elastic collision is a type of collision in which the total kinetic energy of the colliding objects remains constant. In an elastic collision, the objects bounce back after impact without any permanent deformation, and their kinetic energy is unchanged.

Here are some key features of elastic collisions:

Therefore, The type of collision is elastic collision.

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Answer:

1.) h = 164.8 m

2.) U = 49.1 m/s

3.) t = 1.43 seconds

Explanation:

1.) A soccer ball is dropped from the top of a building. It takes 5.8 seconds to fall to the ground. The height of the building is...? 

Since the soccer ball is dropped from the building, the initial velocity U will be equal to zero

Using second equation of motion

h = Ut + 1/2gt^2

Substitutes the time into the formula

h = 1/2 × 9.8 × 5.8^2

h = 164.8 m

2. The Falcon 9 launches to a height of 123 meters. What is its vertical initial velocity?

At maximum height final velocity = 0

Using the third law of motion

V^2 = U^2 - 2gH

0 = U^2 - 2 × 9.8 × 123

U^2 = 2410.8

U = 49.1 m/s

3. An apple falls from rest off a 10.m m tree. How long will it take before it hits the ground?

Since the apple fall from rest, the initial velocity U will be equal to zero

Using the second equation of motion,

h = Ut + 1/2gt^2

substitute all the parameters into the formula

10 = 1/2 × 9.8 × t^2

10 = 4.9t^2

t^2 = 10/4.9

t^2 = 2.04

t = 1.43 seconds

Answer: Dynamic - Static Flexibility

Explanation:

If the oscillation amplitude is 0.22m, from a 0.29kg harmonic oscillator which has a total of mechanical energy 3.6j, the oscillation frequency is 4.141Hz.

It is a number of oscillations in the one-time unit, says per second. For example, a pendulum that takes 0.5s to make one full oscillation has a frequency of 1 oscillation per 0.5s or 2 oscillations / second.

How to calculate the oscillation frequency?

mass (m) = 0.29kg

Total energy (E) = 3.6j

amplitude (x) = 0.22m

E = 1/2 k*x^2

k = 2*E / x^2

= 2 * 3.6 / 0.22^2

= 148.76 N/m

Frequency (v) = 1/2π √k/m

= 1/2*3.14 * √148.76 / 0.22

= 4.141Hz

Therefore, the oscillation frequency is 4.141Hz.

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Answer:

The first statement appears most accurate.

The last statement also appears accurate, but it does not preclude any contradictory evidence.

The following statements accurately describe a scientific law: There is no contradictory evidence in the current body of knowledge. It is a statement that is true in many, but not all, cases. It is an observation that has been made many times.

The other statements do not accurately describe a scientific law:

"It is an educated guess about how a process occurs" describes a scientific hypothesis or theory, not a law.

"Can be updated or rejected if any contradictory evidence is found" describes the nature of scientific theories, which can be revised or discarded based on new evidence, but laws tend to remain consistent.

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10 Gy of protons with RBE=10 will cause the same amount of damage to the tissue as 1 Gy of X-rays or gamma rays.

We need to use the concept of Relative Biological Effectiveness (RBE). RBE is a measure of the ability of radiation to cause biological damage compared to a reference radiation, which is usually X-rays or gamma rays. In this case, the RBE of protons is given as 10.

So, we can say that a dose of X-rays or gamma rays that causes a certain amount of biological damage will require 10 times less dose of protons to cause the same amount of damage.

Now, the question asks how many rad (radiation absorbed dose) of protons with RBE=10 will cause the same amount of damage as a certain dose of X-rays or gamma rays. The answer will depend on the dose of X-rays or gamma rays given, but we can use a hypothetical example.

Suppose a dose of 1 Gy (gray) of X-rays or gamma rays causes a certain amount of biological damage. We can then calculate how much dose of protons with RBE=10 will cause the same amount of damage.

The formula to convert dose from one type of radiation to another with different RBE is:

Equivalent dose = absorbed dose x RBE

So, for protons with RBE=10 to cause the same biological damage as 1 Gy of X-rays or gamma rays, the equivalent dose would be:

Equivalent dose = 1 Gy x 10 = 10 Gy (with RBE=10)

Therefore, 10 Gy of protons with RBE=10 will cause the same amount of damage to the tissue as 1 Gy of X-rays or gamma rays. This is assuming the same type of tissue and biological endpoint. Note that this is just a hypothetical example and the actual answer will depend on the dose and specific biological effect being considered.

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According to Kepler’s law of motion, it is stated that the time period of a planet revolving around the sun, as well as the speed of the planet, are proportional to the radius of the orbit raised to the 3/2 power.

Thus, if the radius of an orbit remains constant, the speed of the satellite will remain constant regardless of any change in mass.

But, according to the law of conservation of momentum, the product of the mass and velocity of a body is constant unless an external force acts on it.

Therefore, if the mass of a satellite is doubled while the radius of its orbit remains constant, then its speed will be halved.

Given: The mass of the satellite is doubled.

The orbit radius remains constant Find:

The speed of the satellite

Solution:

By the law of conservation of momentum

Mass × Velocity = constant Or Mass × Velocity₁

= Mass × Velocity₂

Where Velocity₁ is the initial speed, Velocity₂ is the final speed.

Now, the mass of the satellite is doubled.

Then,

2M × Velocity₁ = M × Velocity₂

Velocity₂ = 2 × Velocity₁

So, the speed of the satellite is doubled.

Answer: The speed of the satellite will be doubled if the mass of a satellite is doubled while the radius of its orbit remains constant.

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The time constant (in ms) of the RC circuit is 3.75 ms. Hence, the correct option is  (d) 3.75 ms.

The rate of decay of the current in a charging capacitor is proportional to the current in the circuit at that time. Therefore, it takes longer for a larger current to decay than for a smaller current to decay in a charging capacitor.A capacitor is discharged through a 20.0 Ω resistor.

The discharge current decreases to 22.0% of its initial value in 1.50 ms. We can obtain the time constant of the RC circuit using the following formula:$$I=I_{o} e^{-t / \tau}$$Where, I = instantaneous current Io = initial current t = time constant R = resistance of the circuit C = capacitance of the circuit

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The time constant of the RC circuit is approximately 0.674 m s.

To determine the time constant (τ) of an RC circuit, we can use the formula:

τ = RC

Given that the discharge current decreases to 22.0% of its initial value in 1.50 m s, we can calculate the time constant as follows:

The percentage of the initial current remaining after time t is given by the equation:

I(t) =\(I_oe^{(-t/\tau)\)

Where:

I(t) = current at time t

I₀ = initial current

e = Euler's number (approximately 2.71828)

t = time

τ = time constant

We are given that the discharge current decreases to 22.0% of its initial value. Therefore, we can set up the following equation:

0.22 =\(e^{(-1.50/\tau)\)

To solve for τ, we can take the natural logarithm (ln) of both sides:

ln(0.22) = \(\frac{-1.50}{\tau}\)

Rearranging the equation to solve for τ:

τ = \(\frac{-1.50 }{ ln(0.22)}\)

Calculating this expression:

τ ≈ 0.674 m s

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Answer:

its b

Explanation:

Supplements labeled “natural” may interact negatively with medications. The correct option is B.

Dietary supplements are substances that you may use to supplement your diet with nutrients or to reduce your risk of health problems such as osteoporosis or arthritis.

Dietary supplements are available in pill, capsule, powder, gel capsules and tablets, extracts, or liquid form.

Dietary supplements are available in a variety of forms, including tablets, capsules, gummies, powders, drinks, and energy bars.

Vitamins D and B12 are popular supplements, as are minerals like calcium and iron, herbs like echinacea and garlic, and products like glucosamine, probiotics, and fish oils.

Because many supplements contain active ingredients that have strong effects in the body, herbal products can pose unexpected risks. Natural supplements may have negative interactions with medications.

Thus, the correct option is B.

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Answer:

4 seconds is -45.2 m/s.

Explanation:

The ratio of the rocket's initial mass to final mass is 1.595

Usng the rocket formula, for change in speed

Δv = v㏑(Mi/Mf) where

Given that a rocket's orbital maneuver requires a speed increase of 1.05 × 10³ m/s. If its engine has an exhaust speed of 2.25 × 10³ m/s,

So,

Making (Mi/Mf) subject of the formula, we have

(Mi/Mf) = exp(Δv/v)

So, substituting these into the equation for the rocket speed, we have

(Mi/Mf) = exp(Δv/v)

(Mi/Mf) = exp(1.05 × 10³ m/s/2.25 × 10³ m/s)

(Mi/Mf) = exp(0.467)

(Mi/Mf) = 1.595

So, the ratio of the rocket's initial mass to final mass is 1.595

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By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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The resonance angular frequency (ω0) in a simple AC circuit can be expressed in terms of the inductance (L) and capacitance (C) as ω0 = 1 / √(LC). To calculate the value of ω0 in radians per second, we need to substitute the given values of L and C into the equation.

In a simple AC circuit consisting of an inductor (L) and a capacitor (C), the resonance angular frequency (ω0) is the frequency at which the circuit exhibits maximum response or resonance. It can be calculated using the formula ω0 = 1 / √(LC), where L is the inductance and C is the capacitance.

To calculate the value of ω0, we substitute the given values of L = 0.085 H and C = 0.075 F into the equation. Plugging these values into the formula, we get ω0 = 1 / √(0.085 * 0.075).

Simplifying the expression, we find ω0 = 1 / √(0.006375) = 1 / 0.0799 ≈ 12.518 radians per second.

Therefore, the value of ω0, in radians per second, for the given circuit is approximately 12.518.

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The reasons for which the waters of Madagascar has red color are sedimentation, algal blooms , red tides etc.

1. Sedimentation: The red color could be due to a high concentration of suspended sediment particles in the water. Sediments can come from erosion of the land, volcanic activity, or other geological processes.

2. Algal Blooms: Certain types of microscopic algae, such as dinoflagellates or diatoms, can cause discoloration of water. Under certain conditions, these algae can multiply rapidly, leading to an algal bloom, which can appear as red or brown patches on the water surface.

3. Harmful Algal Blooms: Some species of algae produce toxins that can be harmful to marine life and humans. These harmful algal blooms (HABs) can discolor the water and pose a threat to the ecosystem.

4. Red Tides: Red tides, which are also caused by algal blooms, can occur in coastal areas and result in the water appearing red or brown. These events can be caused by a variety of factors, including nutrient pollution, temperature changes, and oceanic currents.

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The tropical rainforests of Southeast Asia have over 6,000 species of plants and 450 species of birds.

These are the forests that get the most of the year. They are the most diverse forest on the earth such as the amazon.

These are the forests with very large grasses and occasional trees. They are found in Brazil and India.

These are the temperate forests in which trees shed all their leaves in one seson.

Therefore, the tropical rainforests of Southeast Asia have over 6,000 species of plants and 450 species of birds.

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Answer:

Its b. the tropical rainforest

Explanation:

The question is: Two masses with values ​​of 8kg and 12kg each are separated by a distance of 1m. Determine the force of gravitational attraction between them if compared with the value of their weights. What is this value?

Answer: The force of gravitational attraction between them if compared with the value of their weights is \(640.704 \times 10^{-11} N\).

Explanation:

Given: \(m_{1}\) = 8 kg,       \(m_{2}\) = 12 kg

Distance = 1 m

Formula used is as follows.

\(F = \frac{G \times m_{1} \times m_{2}}{r^{2}}\)

where,

F = force of gravitational attraction

G = gravitational constant = \(6.674 \times 10^{-11} N m^{2}/kg^{2}\)

\(m_{1}\) = mass of object 1

\(m_{2}\) = mass of object 2

r = distance between the centers of these two objects

Substitute the values into above formula as follows.

\(F = \frac{G \times m_{1} \times m_{2}}{r^{2}}\\= \frac{6.674 \times 10^{-11} Nm^{2}/kg^{2} \times 8 kg \times 12 kg}{(1 m)^{2}}\\= 640.704 \times 10^{-11} N\)

Thus, we can conclude that the force of gravitational attraction between them if compared with the value of their weights is \(640.704 \times 10^{-11} N\).

The values of all sub-parts have been obtained.

(1).  The maximum factored load the beam can withstand is 45.2 kN/m.

(2).  The moment resistance of the cross-section is 291735.65 Nm.

(3).  The factored moment demand is 27939.6 Nm

1) To draw the governing shear and bending moment diagram for the factored load, we need to first calculate the maximum factored load that the beam can withstand.

The maximum factored load on the beam is given by:

Dead Load = 20 kN/m + 15 kN

                   = 35 kN/m.

Live Load = 2 kN/m + 1 kN

                = 3 kN/m.

Total Factored Load = 1.2 x Dead Load + 1.6 x Live Load

                                  = 1.2 x 35 kN/m + 1.6 x 3 kN/m

                                  = 45.2 kN/m.

The maximum factored load the beam can withstand is 45.2 kN/m.

The shear force and bending moment diagrams for the given factored load can be obtained as shown below:

Shear Force Diagram:

Bending Moment Diagram:

2) To calculate the moment resistance of the cross-section, we can use the formula:

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

Where, σst = yield stress of tension steel [σst = fy / γst],

γst = safety factor for tension steel [γst = 1.15A']

A' = area of tension steel, [A'' = b(d - a)].

Where,

b = width of the beam [b = 600 mm],  

d = total height of the beam [d= 1000 mm],

a = effective depth of tension steel [a = 920 mm]

f'c = compressive strength of concrete [f'c = 25 MPa],

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

MR = (400 / 1.15) x 10 x (1000 - 920/2) + 0.85 x 25 x 590 x (1000 - 920/2)

MR = 291735.65 Nm

The moment resistance of the cross-section is 291735.65 Nm.

3) To check if this cross-section is adequately designed to resist the factored bending moment (LRFD), we need to calculate the factored moment demand and compare it with the moment resistance.

The factored moment demand is given by:

MF = ϕ x Mu

Where,ϕ = resistance factor = 0.9, Mu = factored bending moment

Mu = 1.2 x Dead Load x L2 / 8 + 1.6 x Live Load x L2 / 8 + 1.2 x (Dead Load + Live Load) x L2 / 2

   = 1.2 x 35 x 152 / 8 + 1.6 x 3 x 152 / 8 + 1.2 x 38 x 152 / 2

   = 31044 Nm

MF = ϕ x Mu

     = 0.9 x 31044

    = 27939.6 Nm

The factored moment demand is 27939.6 Nm, which is less than the moment resistance of the cross-section, i.e., 291735.65 Nm.

Therefore, this cross-section is adequately designed to resist the factored bending moment.

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To determine the volume of a sample of strontium with a given mass, we can use the formula:

Volume = Mass / Density

Given:

Density of strontium (d) = 2.60 g/cm^3

Mass of the sample = 47.2 pounds

Before we proceed, let's convert the mass from pounds to grams, as the density is given in grams per cubic centimeter (g/cm^3).

1 pound is approximately equal to 453.592 grams.

Mass of the sample in grams = 47.2 pounds * 453.592 grams/pound

Now, we can calculate the volume using the formula:

Volume = Mass / Density

Volume = (47.2 * 453.592) / 2.60

By performing the calculations, we can determine the volume of the strontium sample in cubic centimeters.

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The pressure put on the ground by trains has decreased by a ratio of 62.5.

The n + x is used to represent sleeper density. The number of sleepers needed for one rail length is shown by the symbol n + x in this case. A rail's length is given by n. The necessary number of sleepers is 17 13 multiplied by 1000, which comes to 1307.69 x 1308 Numbers.

It is the quantity of sleepers necessary to support a rail-length of railroad track. Its formula is (n + x), where n is the length of a rail in meters and x is a constant with a range of 3 to 6 (the length of a rail for broad gauge (B.G.) track is 13 meters, while that for meter gauge (M.G.) track is 12 meters).

2.5 * 25 = 62.5.

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Jim Crow laws was the legal measure which allowed whites in southern states to keep blacks from voting after reconstruction ended.

These were the state and local laws which enforced racial segregation in the Southern part of the United States.

Due to this laws, whites in southern states kept blacks from voting after reconstruction ended.

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