How do the relative amounts of parent and daughter nuclei determine the
half-life of a radioactive isotope?
A. When all parent nuclei have become daughter nuclei, one half-life
has passed.
о B. When the number of daughter nuclei is less than the number of
parent nuclei, one half-life has passed.
C. When the number of daughter nuclei equals the number of parent
nuclei, one half-life has passed.
O
D.
When the number of daughter nuclei is greater than the number of
parent nuclei, one half-life has passed.

Answer:

non biodegradable

Explanation:

It is non biodegradable because plastic cannot dispose off easily ..

Answer:

Total distance covered (scalar quantity) = 23 km

Displacement (vector quantity) = 3 km north from the original starting point

Explanation:

Since he drove 13 km north and then 10 km south, the total distance he cover in his drive was: 13 km + 10 km = 23 km

On the other hand, his displacement was 3 km north from where he started.

Given:

The frequency emitted by the source, f_s=900 GHz

The observed frequency, f=820 GHz

To find:

The speed of the source and the direction of motion of the source.

Explanation:

The change in the frequency is given by,

On substituting the known values,

Thus the change in the frequency is positive. That is the frequency is decreasing. This is called a redshift and the star is moving away from the earth.

The speed of the source is given by the equation,

Where c is the speed of light and v is the speed of the source.

On substituting the known values,

Final answer:

The velocity of the star is 29.3×10⁶ m/s

And the star is moving away from the earth.

Answer:

2633.7 s

Explanation:

From the question,

Heat lost by the water heater = Heat gained by the water

Applying,

P = cm(t₂-t₁)/t.................. Equation 1

Where P = power of the heat, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature, t = time

make t the subject of the equation

t = cm(t₂-t₁)/P.............. Equation 2

From the question,

Given: c = 4190 J/kgK, P = 3.5 kW = 3500 W, m = 40 kg, t₁ = 20°C, t₂ = 75°C

Substitute these values into equation 2

t = 4190×40(75-20)/3500

t = 9218000/3500

t = 2633.7 s

Answer:

It should be 125 CM

Explanation:

Volume is Length•Width•Height

A cube is equal on all lengths so, 5•5•5

Answer:

125cm cubed

Explanation:

just search volume calculator lol

Answer:

just multiply the frequency and wavelength

200× 2

400

All the equations of motion are as follows, Displacement (s) equation, Final velocity (v) equation, Average velocity (v_avg) equation, Displacement (s) equation with average velocity, and Displacement (s) equation.

In terms of its motion as a function of time, equations of motion define how a physical system behaves. In more detail, the equations of motion define how a physical system behaves as a collection of mathematical functions expressed in terms of dynamic variables.

In conclusion, equations of motion define how a physical system behaves in terms of how its motion changes over time.

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The astronautical engineers work with machine that fly outside the Earth's atmosphere.

The design, development, testing, and production of aircraft, spacecraft, and associated systems and equipment fall within the purview of aerospace engineering. The two main and overlapping sections of the field—aeronautical engineering and astronautical engineering—have historically concentrated on issues relating to air and space flight.

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Answer:

Explanation:

a ) 12.0 lbs  -  mass

b ) .34 g   - mass

c ) 120 kg    - mass  

As lbs , g and kg are units of mass , these things represent mass . lbs is FPS unit of mass and kg is  SI unit . g is CGS unit of force .

d ) 1600 kN     It represents force because kN or kilonewton is unit of  force .

e ) it represents , length or distance because m or metre  is unit of length .

f ) 411 cm It represents length or distance because cm is smaller unit of length

g ) 899 MN or million newton .  Like d ) It also represents force . Million newton is higher unit of force .

Answer:

Explanation:

When a projectile is launched at some angle to the horizontal with some speed vi , and air resistance is negligible , it is definitely a freely falling body .

It is so because it is free to accelerate towards the earth with acceleration of g . Air has no resistance , hence no force is acting on it except the gravitational force . Hence it is a freely falling body .

b )

The acceleration in the vertical direction is due to force exerted by the earth that is gravitational force on it  . Hence its  acceleration is equal to g in vertically downward direction .

c )

It has zero acceleration in horizontal direction . It is so because no force is acting on it in horizontal direction . So no acceleration will be present in horizontal direction . It will move in horizontal direction with constant speed of vi cos θ where θ is the angle vi make with the horizontal .

Despite being the same temperature, the swimming pool is a much larger thermal energy store than the beaker of water.

Thermal energy is the energy contained within a system that controls its temperature. The flow of thermal energy is defined as heat.

Thermodynamics is a branch of physics that deals with how heat is transferred between different systems and how work is done in the process.

Thermal energy sources include natural gas, coal, and oil, as well as solar, heat pump electric, and geothermal heat.

A swimming pool and a beaker of water can both be the same temperature.

Despite being the same temperature, the swimming pool contains significantly more thermal energy than the beaker of water. A heated swimming pool's thermal store contains a lot of energy.

Thus, If a pool and a cup of water had the same temperature, then swimming pool has a much larger thermal energy.

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The radio waves travels between the two boxes and they were travelling through air,

In that way, the radio waves from box A to B through air, the box A will gets the signal, and then modulates, amplifies and then it send out radio waves. Through the air, Box B will captures, amplifies and demodulates radio waves.

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Answer: The net force acting on an object is the sum of all the force acting on it, and the net force of an object is zero. I f the forces acting on it tend to cancel each other. For example you are sit in a chair, the earth's gravity is pulling you down, but the chair is pushing you up with an equal amount of force.

There is my answer from my notebook .I hope its good :)

Answer:

1.4 m/s2

Explanation:

i took the test

Time period depends on the length of the pendulum and the force of gravity.

The time period of a simple pendulum does not depend on mass and material of the bob. It depends on the length of the pendulum and the force of gravity because more length of the pendulum leads to more time to complete one cycle.

So we can conclude that time period depends on the length of the pendulum and the force of gravity.

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Answer:

This problem involves the concept of a random walk, which is a mathematical model of a path consisting of a succession of random steps.

The question asks for the distance, R(n), from the center of a star after n steps of a photon, assuming a 2D random walk.

The random walk in two dimensions has a step length of A_i and the direction of the steps is uniformly distributed in [0, 2π). The change in position after each step can be written in Cartesian coordinates (Δx, Δy), where Δx = A_i cos(θ_i) and Δy = A_i sin(θ_i).

The displacement from the center after n steps is given by the vector sum of all the individual steps. This vector sum can be written in terms of its Cartesian coordinates, (X, Y), where X = Σ Δx and Y = Σ Δy. This sum over n random vectors is itself a random variable. The net displacement R(n) from the center of the star after n steps is given by the magnitude of the net displacement vector:

R(n) = √(X² + Y²)

Because each step is independent and has a random direction, the expected value of the cosine and sine for any step is zero. This means that the expected values of X and Y are both zero.

However, the mean square displacement is not zero. Because the steps are independent, the mean square displacement in each direction is additive. For a 2D random walk:

<X²> = Σ <(Δx)²> = n <(A cos θ)²> = n A²/2

<Y²> = Σ <(Δy)²> = n <(A sin θ)²> = n A²/2

Because <X²> = <Y²>, we can write:

<R²> = <X²> + <Y²> = n A²

So, the root mean square distance (the square root of the mean square displacement) after n steps is:

R(n) = √(<R²>) = √(n) * A

Therefore, the distance R(n) that the photon is expected to be from the center of the star after n steps grows as the square root of the number of steps, with each step having a length A. Please note that this result holds for a 2D random walk. A real photon in a star would be performing a 3D random walk, which would have slightly different characteristics.

Answer:

v = 16,66 m/s

Explanation:

To obtain the velocity of the train we must use the velocity formula for a uniform line movement:

v = x/t

Where x is the space and t is time.

replacing given values:

v = 180 km / 3 h

v = 60 km/h

to pass this value to international units:

v = 60 / 3,6 m/s

v = 16,66 m/s

Answer:

determination

Explanation:

Okay, here are the steps to calculate the full distance traveled when an object is thrown at a certain speed and angle:

You have the initial velocity (v): 35 m/s

You have the launch angle (θ): 45 degrees

We need to split the initial velocity into its horizontal (vx) and vertical (vy) components.

To calculate vx (horizontal component):

vx = v * cosθ

vx = 35 * cos(45) = 24.7 m/s

To calculate vy (vertical component):

vy = v * sinθ

vy = 35 * sin(45) = 24.7 m/s

We can calculate the horizontal distance (d) traveled using:

d = vx * t (where t is time)

Since there is no air resistance, the vertical velocity (vy) will remain constant. This means the time the object is in the air is:

t = vy / g (where g is acceleration due to gravity, 9.8 m/s^2)

t = 24.7 / 9.8 = 2.52 seconds

Now we can calculate the full horizontal distance traveled:

d = vx * t

d = 24.7 * 2.52

= 62.3 meters

So the full distance the object will travel when thrown at 35 m/s at a 45 degree angle is approximately 62 meters.

Let me know if you have any other questions!

Answer:

To calculate the full distance traveled by an object thrown at a velocity of 35 m/s at an angle of 45 degrees, we need to consider the horizontal and vertical components of the motion separately.

The horizontal component of the motion remains constant throughout the trajectory and is given by:

Horizontal distance = (Initial velocity) * (Time of flight) * cos(angle)

In this case, the initial velocity is 35 m/s, the angle is 45 degrees, and we need to find the time of flight.

The time of flight can be calculated using the vertical component of the motion. The vertical motion can be described using the equation:

Vertical displacement = (Initial velocity * sin(angle))^2 / (2 * acceleration)

Where the initial velocity is 35 m/s, the angle is 45 degrees, and the acceleration is the acceleration due to gravity, approximately 9.8 m/s^2.

The vertical displacement is zero at the highest point of the trajectory since the object comes back down to the same height it was launched from. So we can solve the equation for the time of flight.

Using these calculations, we can find the horizontal distance traveled by the object.

Let's calculate step by step:

Step 1: Calculate the time of flight

Vertical displacement = 0 (at the highest point)

0 = (35 * sin(45))^2 / (2 * 9.8)

0 = (24.75^2) / 19.6

0 = 616.0125 / 19.6

0 = 31.43

Step 2: Calculate the time of flight

Vertical displacement = (Initial velocity * sin(angle)) * time - (1/2) * acceleration * time^2

0 = (35 * sin(45)) * time - (1/2) * 9.8 * time^2

0 = 24.75 * time - 4.9 * time^2

4.9 * time^2 - 24.75 * time = 0

time * (4.9 * time - 24.75) = 0

time = 0 (initial point) or 24.75 / 4.9

time = 5.05 seconds

Step 3: Calculate the horizontal distance

Horizontal distance = (Initial velocity) * (Time of flight) * cos(angle)

Horizontal distance = 35 * 5.05 * cos(45)

Horizontal distance = 35 * 5.05 * (sqrt(2)/2)

Horizontal distance = 88.96 meters

The actual speed of the boat as it travels across the moving river is 9.80 meters per second.

This is further explained below.

- The boat traveled over the calm sea at a speed of 10.0 m/s.

- River water velocity, Un = 2.00 m/s

Let v be the ferry's effective speed across the water of the river such that it may go straight to the destination on the other side.

Then, as illustrated below, we may express their velocities.

The triangle ABC is a right-angled triangle, as we are aware. Consequently, we may write using the Pythagoras theorem.

\(A C^2=A B^2+B C^2\)

i.e

\(v_f^2=v^2+v_r^2\)

\(&v^2=v_f^2-v_r^2 \\\\&v=\sqrt{v_f^2-v_r^2} \\\)

\(&v=\sqrt{(10.0 \mathrm{~m} / \mathrm{s})^2-(2.00 \mathrm{~m} / \mathrm{s})^2} \\\)

v=9.80

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Positive connotation is a specific form of reframing the presenting problem.

It is a positive explanation of the current functioning within a family system aimed at creatively circumventing resistance and negating blame by approaching the presenting problem from a position of circular causality. It evokes a positive emotional response.

The primary function of this *positive reframing technique allows the therapist to take a family systems perspective of the family and the symptomatic behaviors that have brought the family to therapy. Positive connotation is often utilized as an antecedent to the paradoxical prescription that the family continues in its current functioning.

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The initial temperature of the forging is approximately 1,090.42°C.

To determine the initial temperature of the forging, we can use the principle of conservation of energy. The heat lost by the forging is equal to the heat gained by the oil during the quenching process.

The heat lost by the forging can be calculated using the formula:

Q_lost = m_forging * c_forging * (T_forging_initial - T_equilibrium)

where:

- Q_lost is the heat lost by the forging

- m_forging is the mass of the forging (90.8 kg)

- c_forging is the specific heat capacity of the forging (434 J/(kg C°))

- T_forging_initial is the initial temperature of the forging (unknown)

- T_equilibrium is the final temperature of the oil and forging at thermal equilibrium (58.9°C)

The heat gained by the oil can be calculated using the formula:

Q_gained = m_oil * c_oil * (T_equilibrium - T_oil_initial)

where:

- Q_gained is the heat gained by the oil

- m_oil is the mass of the oil (689 kg)

- c_oil is the specific heat capacity of the oil (2680 J/(kg C°))

- T_oil_initial is the initial temperature of the oil (38.3°C)

Since the heat lost by the forging is equal to the heat gained by the oil, we can set up the following equation:

m_forging * c_forging * (T_forging_initial - T_equilibrium) = m_oil * c_oil * (T_equilibrium - T_oil_initial)

Plugging in the given values, we can solve for T_forging_initial:

90.8 kg * 434 J/(kg C°) * (T_forging_initial - 58.9°C) = 689 kg * 2680 J/(kg C°) * (58.9°C - 38.3°C)

Simplifying the equation:

90.8 * 434 * (T_forging_initial - 58.9) = 689 * 2680 * (58.9 - 38.3)

Solving for T_forging_initial:

T_forging_initial - 58.9 = (689 * 2680 * (58.9 - 38.3)) / (90.8 * 434)

T_forging_initial = 58.9 + (689 * 2680 * (58.9 - 38.3)) / (90.8 * 434)

Calculating the value:

T_forging_initial ≈ 1,090.42°C

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To convert 26 miles and 385 yards to kilometers, we first need to convert miles and yards to the same unit.

1 mile = 1760 yards

26 miles = 26 x 1760 = 45600 yards

Then add the yards of the distance, so the total distance in yards is 45600+385 = 45985 yards

Now we can convert yards to kilometers.

1 yard = 0.9144 meters

45985 yards = 45985 x 0.9144 = 42.195 kilometers

So 26 miles and 385 yards is approximately 42.195 kilometers.

The force is 400.2 N

The work done is 120 J

The power is 48W

Force is a physical concept that describes the influence that one object has on another object, causing it to accelerate or deform. Force can be defined as any influence that changes the motion of an object, such as a push or a pull.

How to solve:

under equilibrium condition

F * 1.45 m =68 kg * 9.81 m/s^2 *0.87 m

F =400.2 N

b)

work done = m*g*h =68 kg*9.81 m/s^2*0.180 m =120.0744 J =120 J

c)

power =120.0744 J *(24 /60 s) =48.02976 W = 48 W

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The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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The following are the correct matches for the waves in Column A and the wave types in Column B:

A mechanical wave is a wave that requires a medium to travel through. The two types of mechanical waves are transverse waves and longitudinal waves. A transverse wave is a wave in which the particles of the medium move perpendicular to the direction of the wave. A longitudinal wave is a wave in which the particles of the medium move parallel to the direction of the wave.

An electromagnetic wave is a wave that does not require a medium to travel through. Electromagnetic waves are made up of electric and magnetic fields that oscillate perpendicular to each other.

A matter wave is a wave that describes the probability of finding a particle at a given location. Matter waves are associated with all particles, including electrons, protons, and neutrons.

A spring wave is a type of mechanical wave that travels through a spring. The particles of the spring move back and forth along the length of the spring.

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