What percent remains after 2 half-lives?

Answer:

Science and technology have had a major impact on society, and their impact is growing. By drastically changing our means of communication, the way we work, our housing, clothes, even the length, and quality of life itself, science has generated changes in the moral values and basic philosophies of mankind.

Explanation:

Answer:

C

Explanation:

The substances are changed.

A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation .

Answer:

the condition that distinguishes animals and plants from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death.

Explanation:

hope this helps

A Gaussian surface contains a single charge within it, and as a result, electric flux passes through the surface. Suppose the charge is then moved to another spot within the Gaussian surface.

The flux through the surface does not change. The flux through a closed surface depends only on the net charge enclosed by the surface. Moving the charge to another spot within the Gaussian surface does not change the net charge enclosed, hence the flux through the surface remains the same. A Gaussian surface is a conceptual device in electromagnetism used to calculate electric fields. A Gaussian surface is a closed surface in three-dimensional space through which the electric flux passes. The net electric flux through the surface is used to calculate the electric charge enclosed within the surface.

A Gaussian surface is also known as a Gaussian control volume electric flux is a scalar quantity that represents the amount of electric field passing through a surface. Electric flux is denoted by the symbol phi, and it is defined as the product of the electric field and the area of the surface it passes through. The electric flux is proportional to the amount of electric charge enclosed by the surface.

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When you decrease the distance to the nut, the lever arm also decreases. Hence the correct option is "It decreases".

This is because the lever arm is the perpendicular distance between the axis of rotation and the line of action of the force. In this case, the axis of rotation is the nut and the force is applied at a point closer to the nut. As the distance between the force and the nut decreases, the lever arm also decreases.

This relationship between distance and lever arm is important in understanding how levers work. A longer lever arm allows for greater torque or rotational force to be applied with the same amount of force. Conversely, a shorter lever arm requires more force to generate the same amount of torque. By decreasing the distance to the nut, you are effectively shortening the lever arm and therefore reducing the torque that can be applied.

Understanding the relationship between distance and lever arm can be useful in a variety of contexts, such as in engineering, physics, and even sports. It can help in designing more efficient machines or in understanding how to optimize physical movements for maximum performance.

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(1) The force exerted by the hammer claws on the nail is 67.54 N.

(2) The the force exerted by the surface on the point of contact with the hammer head is 124 N.

The force exerted by the hammer claws on the nail is calculated by applying the following formula.

Fy = W sinθ

where;

Fy = 124 N x  sin ( 33 )

Fy = 67.54 N

The the force exerted by the surface on the point of contact with the hammer head is calculated as follows;

Fn = W sin (90)

Fn = 124 N

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An object in motion, such as a car or a bird, has kinetic energy but not potential energy.

An object in motion has kinetic energy, but it doesn't necessarily have potential energy. Potential energy is the energy that an object possesses due to its position in a gravitational field or an electric field. An object that has the potential to move, but isn't moving, has potential energy. However, if an object is already in motion, it doesn't have the potential to move, and hence it doesn't have potential energy. This is because potential energy is directly proportional to an object's position or height above a surface with a gravitational or electric field.For instance, when a car is traveling down a road, it has kinetic energy, which is proportional to its mass and velocity, but it doesn't have potential energy because it's not at any height or position above the ground that can produce potential energy. Similarly, a bird that's flying through the air has kinetic energy because it's in motion, but it doesn't have potential energy because it's not above the ground or any surface with a gravitational or electric field.

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Answer:

Please mark me as Brilliant

Explanation:

I shall solve both one by one

Case 1: 1 kg of water at 10° C

Let the final temperature be T° C , where T°C < 30°C.

Heat give out by 4.4 kg of water at 30° C to come down to T°C = 4400 g × 1 calorie/g/°C × (30- T)° C = (4400× 30 - 4400 T) calorie

Heat gained to raise temperature of 1kg of water at 10° to T° = 1000 g × 1 calorie/g/°C × (T -10)° C = 1000 T - 10,000) calorie

Heat gained = Heat lost

1000 T - 10,000 = 1,32,000 - 4400 T; ==> 54 00T = 1.42,000; T = 1,42,000/5400 = 26.3° C.

In case it is 1 kg of water at 10° C mixed with 4.4 kg of water at 30° C, the final temperature of the mixture would be T = 26.3° C.

Case 2: 1 kg of ice.

Ice is essentially at its melting point/freezing point ie at 0° C.

Let the temperature of mixture = T° C

Heat required to melt 1 kg (=1000 g of ice) at 0° C to water at 0° C = 1000 g × 80 calorie/g = 80,000 calorie

Heat require to raise temperature of 1000 g of water at 0° C to water at T° C = 1000g × 1 calorie/g/°C× (T -0)° C = 1000 T calorie

Heat gained = 80,000 + 1000 T

Heat lost by 4.4 kg of water at 30° C to cool to T° C = 4400 g × 1 calorie/g /° C × ( 30 - T)° C = 1,32,000 - 4400 T

Heat gained = Heat lost

80,000 + 1,000 T = 1,32,000 -4400 T

5400 T = 52,000/5400; ==> T = 9.63°C.

In case it is ice, the temperature of the mixture is T = 9.63° C.

Added: around 2 pm

A stiffer spring would cause the box to reach a greater maximum height. This is because a stiffer spring would have a greater spring constant k, which means it can store and release more energy when compressed and released.

A stiffer spring would cause the box to reach a greater maximum height. This is because a stiffer spring would have a greater spring constant k, which means it can store and release more energy when compressed and released. When the box is launched, the stiffer spring will transfer more energy to the box, which would result in a greater initial velocity and therefore a greater maximum height. This can be explained using the conservation of energy principle, which states that the potential energy stored in the compressed spring is converted into the kinetic energy of the box when it is launched. Therefore, a stiffer spring would result in a greater potential energy and therefore a greater maximum height for the box.

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The angular momentum of the ball that has a mass of 5.2 kg and is swung around a rope with a radius of 0.86 meters at a speed of 1.8 m/s is approximately 7.24 kg m²/s.

We know that angular momentum is the product of an object's rotational inertia and rotational speed or angular velocity. The equation for angular momentum is:L = IωWhere L is angular momentum, I is rotational inertia, and ω is angular velocity. Since the ball is moving in a circular path, we need to use the formula for rotational inertia of a point mass: I = mr², where m is the mass of the ball and r is the radius of the circle.The angular velocity ω can be calculated from the linear speed v using the formula v = rω, which gives ω = v/r. Substituting these values into the equation for angular momentum, we get:L = Iω = (mr²)(v/r) L = 5.2 kg x 0.86 m x 1.8 m/s = 7.24 kg m²/sTherefore, the angular momentum of the ball is approximately 7.24 kg m²/s.

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The horizontal distance travelled by the football is 3.1 m.

The angle of projection of the football is calculated as follows;

tan ( θ ) = Vy / Vx

where;

tan ( θ ) = 5 / 3

tan ( θ ) = 1.667

θ = arc tan (1.667)

θ = 59⁰

The resultant velocity of the ball is calculated as follows;

v = √ (Vx² + Vy²)

v = √ (3² + 5²)

v = 5.83 m/s

The horizontal distance travelled by the football is calculated as follows;

x = v² sin(2θ) /g

where;

x = [ (5.83)² sin(2 x 59) /9.8 ]

x = 3.1 m

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Answer:

extensions.

Explanation:

Hope this helps

Answer:

extensions i think because sound waves travel through the air and to our ears so its extended  

Explanation:

Based on the question posed during a vehicle crash test The vehicle's pre-collision speed is 7.63 meters a second.

When gravity first exerts force on an item, its initial velocity indicates how quickly the thing moves. The total momentum, on the other hand, is a vector number that gauges a traveling body's speed and direction after it has attained its utilize high.

Force exerted on the wall, F = 140,000 N

time of contact, t = 0.12 s

final speed of the car = 0 m/s

initial speed of the car = ?

we know,

Impulse is equal to change in momentum

J = m v- mu

J = 2200 x 0 - 2200 x (-u)

J = 2200 u

impulse is also equal to force into time

J = F x t

equating both equation of impulse

2200u = F  x t

2200 u = 140000 x 0.12

2200 u = 16800

u = 7.63 m/s

Speed of the car before collision is equal to 7.63 m/s

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Answer:

B - The model does not move or behave like a real atom.

Explanation:

The solid ball does not show how the nucleus is composed of protons and neutrons, or the relationship between the electrons and the nucleus.

Utilitarianism's opponents say that it is a "doctrine worthy only of pigs". Because, they think that human beings have a higher purpose than the maximization of pleasure.

A moral theory known as utilitarianism favours activities that increase happiness or pleasure and disapproves of those that increase sadness or harm. A utilitarian ideology would seek to improve society as a whole when used to guide social, economic, or political decisions.

According to utilitarianism, a decision is morally correct if it makes the most people happy within a community or a group.

A moral theory known as utilitarianism favors activities that increase happiness and disapproves of those that decrease it.

"The greatest amount of benefit for the greatest number of people" is what utilitarianism advocates.

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The speed with which they threw the bundle is  14 m/s.

We know that the speed of the bundle can be obtained from the use of the equations of kinematics. Now we can use the equation of the upward motion under gravity here.

Using;

v^2 = u^2 - 2gh

v = final velocity

u = initial velocity

g = acceleration due to gravity

h = height

Now;

v = 0 m/s at the maximum height

u^2 = 2gh

We now have;

u = √2gh

u = √ 2 * 9.8 * 10

u = 14 m/s

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Hello!

We can use the following relationship:

\(\Delta KE = W = F \cdot d\)

ΔKE = Change in Kinetic Energy (J)
W = Work done on object (J)

F = Force (N)

d = distance of which the force is applied to the object. (This is equivalent to the length of the gun barrel, or 0.8 m)

Also, recall that:
\(KE = \frac{1}{2}mv^2\)

m = mass of bullet (0.02 kg)

v = velocity of bullet (vfinal = 985 m/s, vinitial = 0 m/s)

We can now solve.

\(\Delta KE = F \cdot d\\\\KE_f - KE_i = F \cdot d\\\\\frac{1}{2}(0.02)(985^2) - \frac{1}{2}(0.02)(0^2) = (0.8)F\\\\9702.25 = 0.8F\\\\F = \frac{9702.25}{0.8} = \boxed{12127.813 N}\)

The scientific notation of the following are:

Scientific notation is a way of writing very large or very small numbers in a more concise form. It involves expressing a number as a product of a coefficient (a number between 1 and 10) and a power of 10.

For example, the number 3,000,000 can be expressed in scientific notation as 3 x 10⁶, where 3 is the coefficient and 10⁶ represents the power of 10. Similarly, the number 0.0000025 can be expressed as 2.5 x 10⁻⁶, where 2.5 is the coefficient and 10⁻⁶ represents the power of 10.

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Image transcribed:

SWYK - Scientific Notation

Write the following numbers in standard notation:

a. 9 x 10³

b. 7.7 x 10⁻⁵

a. 4.99 x 10⁻⁹

b. 2.25 x 10¹⁰

The evidences that the Earth is a sphere not flat.

The Earth we know, is a sphere that rotates on its axis for about 24 hours. It also revolves around the Sun for about 365 days. Like other celestial bodies, researchers say that the Earth is round, a sphere.

There are many evidences that the Earth is a sphere. Some of them are as explained above.

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Answer:

4. INTERNATIONAL ASTRONOMICAL UNION

Answer:

6. force is the pull or push which changes or tends to change the (either rest or motion) of a body.

Answer:

See below ~

Explanation:

ice wedging : mechanical weathering

oxidation : chemical weathering

abrasion : mechanical weathering

plant roots : biological weathering

hydrolysis : chemical weathering

8000 Joules is the amount of work required to haul up the equipment.

To calculate the work required to haul up the equipment, we need to consider two components: the work done against gravity and the work done against the weight of the rope.

The force due to gravity is given by the weight of the equipment, which is 100 N. The distance over which the force is applied is the height the equipment is being hauled, which is 40 meters. The work done against gravity can be calculated using the formula:

Work = Force × Distance

Work against gravity = 100 N × 40 m = 4000 N·m or 4000 J (Joules)

The weight of the rope can be calculated by multiplying the weight per meter (0.8 N/m) by the length of the rope (40 m):

Weight of the rope = 0.8 N/m × 40 m = 32 N

Since the rope is being hauled up, the work done against the weight of the rope is the same as the work done against gravity. Therefore, the work against the weight of the rope is also 4000 J.

The total work required to haul up the equipment is the sum of the work against gravity and the work against the weight of the rope:

Total work = Work against gravity + Work against rope weight

Total work = 4000 J + 4000 J

Total work = 8000 J

Therefore, it will take 8000 Joules of work to haul up the equipme

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The isotopes of any element have same number of protons inside them.

Cadmium is a chemical element with the symbol Cd and atomic number 48. It is soft, silvery and white metal.

Given is about Cadmium that it has eight naturally occurring isotopes.

Isotopes are the atoms of the same element which have same number of protons in them but the number of neutrons are different. Isotopes usually have same chemical properties, but they have different physical properties. Their can be stable and unstable isotopes. These unstable isotopes are also called radioisotopes, since they emit radiation. Thus, the isotopes have same number of protons.

Therefore, the isotopes of any element have same number of protons inside them.

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Answer:

0.09 kg

Explanation:

f=0.27

a=3

m=f/a

m=0.27/3

m=0.09

Answer:

first object final velocity =2m/s

second = 12m/s

Explanation:

i hope this will help you,..,