A block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace?
A. 27.0 cm3
B. 213 cm3
C. 7.89 cm3
D. 0.127 cm3

The height of the ball above the ground is 38.45 m

First we will calculate the velocity of the ball when it touch the ground by using first equation of motion

v=u+gt

v=0+9.81×2.8

v=27.468 m/s

now the height of the ground can be calculated by the formula

v=√2gh

27.468=√2×9.81×h

h=38.45 m

Technician A is Correct.

You can see this when he says that conductors have more free electrons than insulators. This statement is True.

While Technician B says that, insulators have the lower resistance than conductors. This statement is False.

The answer here is A) 7.4 m.

As per the question Bob drops the bag full with feathers from the top of the building.

The mass of the bag(m)= 1.0 lb

Let the air resistance is neglected.As the bag is under free fall ,hence the only force that acts on the bag is the force of gravity which is in vertical downward direction.

Here the acceleration produced on bag due to the free fall will be nothing else except the acceleration due to gravity i.e g =9.8 m/s^2

Here we are asked to calculate the distance travelled by the bag at the instant 1.5 s

Hence time t= 1.5 s

From equation of kinematics we know that -

                S=ut + 0.5at^2     [ here S is the distance travelled]

For motion under free fall initial velocity (u)=0.

Hence   S= 0×1.5+{0.5×(-9.8)×(1.5)^2}

           ⇒ -S =0-11.025 m

            ⇒ S= 11.025 m

                   =11 m

Here the negative sign is taken only due to the vertical downward motion of the body .we may take is positive depending on our frame of reference .

Hence the correct option is B.

Continents move slowly over time Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. :P

Continents move due to plate tectonics, which explains how the Earth's lithosphere is divided into plates that interact and move. Plate boundaries are the regions where plates meet and their movement is responsible for the movement of continents.

The movement of continents is known as plate tectonics. The theory of plate tectonics explains how the Earth's lithosphere (the rigid outer layer of the Earth) is divided into several large and small plates that move and interact with each other. These plates can contain entire continents, and their movement is driven by convection currents in the Earth's mantle. When two continental masses are moving towards each other, they collide and can create mountain ranges, such as the Alps formed by the African and Eurasian plates.

Plate tectonics is the scientific explanation for why continents move. It involves the movement and interaction of several large and small plates that make up the Earth's lithosphere. By understanding plate tectonics, scientists have been able to explain the movement of continents as well as other geological phenomena such as earthquakes and volcanic activity.

Plate boundaries are the regions where two plates meet. There are three types of plate boundaries: divergent boundaries (where plates move apart), convergent boundaries (where plates collide), and transform boundaries (where plates slide past each other). The movement of these plates at the boundaries is responsible for the movement of continents over long periods of time.

Answer

The ways are;

• By commercializing low earth orbit

• By supporting water purification efforts worldwide

• By bringing space station ultrasound equipment on earth

• By improving eye surgery with space hardware

Explanation

There is a revolutionary commercial pathways that is currently opening access to space.For example, NASA is purchasing commercial cargo resupply to space station which enable U.S business to develop a competition in selling services to others while freeing NASA resources for deep space exploration. Using  technology developed in space, the Water Security Corporation has deployed systems using NASA water-processing technology to ensure drinkable water availability for human survival. Medical care in remote regions is now  facilitated by use of small ultrasound units, tele-medicine  and remote guided methods similar to those used in space. The Eye Tracking Device experiment has enable researchers to have an insight into corrective laser surgeries.

Answer:c

Explanation:

Yes, According to law of conservation of energy the total energy of any system remains conserved (same).

Example.

If a body is placed at some height it possesses some potential energy.

As P.E =mgh

When this body is starting moving downwards its height becomes decreases so P.E decreases but at the same time it is moving I.e having some velocity. K.E =1/2(m)(v^2).

Hence here P.E decreases but K.E increases at the same time. So total energy is conserved.

Final answer:

The conservation of mechanical energy principle states that in a system where only conservative forces act, the total mechanical energy (KE + PE) remains constant, represented by the equation KEi + PEi = KEf + PEf.

Explanation:

When discussing the scenario where the total mechanical energy, which is the sum of kinetic energy (KE) and potential energy (PE), remains constant, we are addressing a concept from Physics known as the conservation of mechanical energy principle.

This principle states that, in the absence of non-conservative forces like friction, the total mechanical energy of a system (KE + PE) does not change. The equation representing this principle is often displayed as KEi + PEi = KEf + PEf, where the subscripts i and f represent the initial and final states respectively.

This is a direct consequence of the work-energy theorem for conservative forces. It's important to note that this conservation applies only when all acting forces are conservative. Energy within such a system transfers between kinetic and various forms of potential energy, but the total amount of mechanical energy remains unchanged.

It will most likely expand when hot and contract when cold.

When a concrete road is heated by energy from the Sun, the Concrete will most likely expand.  If no expansion joints have been provided during construction, then it will eventually crack.

The change in position of an object is called Velocity which tells you that some kind of motion took place but does not let you know the speed in which the object changed position. :)

The change in an object's position is the definition for displacement. A change in position over time is motion.

Given:

u(initial velocity)=0

v(final velocity)=31.4ft/s=9.57m/s

time taken to cover the distance=1.2 s

Now we know that

v = u + at

Where v is the final velocity

u is the initial velocity

a is the acceleration

t is the time taken to cover the distance

Substituting the given values in the above formula we get

v= u + at

9.57=0+ ax1.2

a=26.17 m/s^2

Viscous force on the plate is given by

[tex]F = \eta A \frac{dv}{dx}[/tex]

[tex]F_v = 2.5* 1.5*1.5 * \frac{0.1}{1.2* 10^{-3}}[/tex]

[tex]F_v = 468.75 N[/tex]

Buoyancy force on the plate is given as

[tex]F_b = \rho V g[/tex]

[tex]F_b = 950* 1.5*1.5*1.2*10^{-3} * 9.8[/tex]

[tex]F_b = 25.14 N[/tex]

Weight of the plate = 50 N

Now for constant speed of plate the net force on it must be zero

SO here we can say

[tex]F_v + W = F_b + F[/tex]

[tex]468.75 + 50 = 25.14 + F[/tex]

[tex]F = 493.6 N[/tex]

So it will require a constant force of 493.6 N

The total force required to lift the metal plate at a constant speed of 0.1 m/s through the oil-filled gap is 72.5N. The power required to do this is 7.25 Watt.

The subject of this problem can be understood with fluid mechanics, particularly focusing on the concepts of viscosity and drag. Using the formula for viscous force: F = ηAv/d where η is the viscosity of the liquid (2.5 N.s/m²), A is the area of the plate (1.5m x 1.5m = 2.25 m²), v is the velocity of the plate (0.1 m/s), and d is the distance of the gap (25mm = 0.025 m). The force can be calculated as F = 2.5 x  2.25 x  0.1 / 0.025 = 22.5 N.

This is the extra force required to overcome the drag due to the viscosity of the oil. But we should also lift the weight of the plate, so the total force required is 50N (weight) + 22.5N (Viscous force) = 72.5N.

Power is calculated by multiplying the total force by the velocity of the motion. Hence, power = force x velocity = 72.5N x 0.1m/s = 7.25 Watt.

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the layers of rocks, the ancient treasures that are at the bottom of the sea, how old the coral is. But I don't think they determined how old it is, how would the dinosaurs that lived in water swim or any drink water. I don't know if this helps but hopefully it does. Also scientist have made advanced tech that could help with the age determination of the ocean floor.

This is possible due to inertia of motion. which is nothing but newton's first law.

according to this law , an object tries to retain its state of motion or rest unless acted upon by an external force.  

consider an object placed on a paper, initially both the object and paper are at rest. to pull the paper , we apply force on the paper and paper gains velocity. but the object keeps its motion of rest and hence the paper can be removed without moving the object.

The gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

The law of universal gravitation defines the gravitational force between two objects.

Using the Formula :

[tex] F = \frac{m_{1}m_{2}}{r^{2}}[/tex]

From the formula ;

Therefore, the product of the masses are directly proportional and the inversely proportional to the square of the distance apart.

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According to Newton's law of gravitation, the gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

Mathematically, the formula for expressing Newton's law of gravitation is calculated as [tex]C \alpha\frac{Mm}{r^2}[/tex]

If the proportionality sign is removed, we will introduce a constant known as gravitational constant to have: [tex]C =\frac{GMm}{r^2}[/tex]

Hence based on the formula, the complete statement will be the gravitational force between two objects is directly proportional to the products of the masses and inversely proportional to the square of the distance between them.

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ATP is the primary energy currency of the body, providing the energy needed for various processes, including muscle contraction, nerve impulses, and metabolic functions.

Energy for daily tasks is primarily derived from the food we consume. The body breaks down carbohydrates, fats, and proteins from our diet through digestion.

These macronutrients are then converted into a molecule called adenosine triphosphate (ATP) through cellular respiration, occurring in the mitochondria of our cells.

ATP is the primary energy currency of the body, providing the energy needed for various processes, including muscle contraction, nerve impulses, and metabolic functions. So, when we do chores, go to school, or play sports, it's the result of our cells producing and utilizing ATP to power these activities.

Proper nutrition and a balanced diet are essential to ensure a steady supply of energy for our daily lives.

Learn more about energy here

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it is 55 mph that is ok

Final answer:

The average speed of a car that traveled 330 miles in 6 hours is calculated by dividing the distance by the time, resulting in an average speed of 55 mph.

Explanation:

To calculate the average speed of the car, we need to divide the total distance travelled by the total time taken for the trip. In this case, the car travelled 330 miles in 6 hours.

The formula for average speed is:

Average Speed = Total Distance ÷ Total Time

Inserting the given values into the formula:

Average Speed = 330 miles ÷ 6 hours = 55 miles per hour (mph)

This means the car's average speed was 55 mph on that particular trip.

Acceleration is defined as rate of change in velocity

So we can write its formula as

[tex]a = \frac{v_f - v_i}{t}[/tex]

here we know that

[tex]v_f[/tex] = final velocity = 56 m/s

[tex]v_i[/tex] = initial velocity = 7.6 m/s

t = time interval to change the velocity = 3 s

now we will plug in all values in the above equation

[tex]a = \frac{56 - 7.6}{3}[/tex]

[tex]a = \frac{48.4}{3}[/tex]

[tex]a = 16.13 m/s^2[/tex]

so here roller coaster will accelerate at rate of 16 m/s^2 and hence correct answer is "option d"

The given question is incomplete, here is a complete question.

Which type of atom is expected in the reactants of this chemical reaction?

[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

A. iron (Fe)

B. gold (Au)

C. nitrogen (N)

D. chlorine (Cl)

Answer : The type of atoms expected in the reactant of the chemical reaction is, iron (Fe)

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

The species present on the left side of the right arrow is the reactant and the species present on the right side of the right arrow is the product.

The balanced chemical reaction is:

[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

The given molecule is made up of two elements that are iron and oxygen.

In the given equation, iron and oxygen are reactants and [tex]Fe_2O_3[/tex] is the product.

Hence, the type of atoms expected in the reactant of the chemical reaction is, iron (Fe)

Answer: Option (c) is the correct answer.

Explanation:

When two or more small nuclei combine together to form a larger nuclei then this process is known as nuclear reaction.

The smaller is an atom, the more energy it requires to release an electron. This energy is known as binding energy.

Thus, when two small nuclei fuse together then there will be more binding energy as compared to when two large nuclei fuse together.

For example, fusion of two hydrogen atoms release more energy then one helium atom, and upon binding excess energy is released into the space.

Hence, we can conclude that energy is released in a nuclear fusion reaction based on mass-energy equivalence because for small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.

Final answer:

Energy is released in a nuclear fusion reaction because the mass of the original nucleus is greater than the mass of the products. This is due to mass-energy equivalence and the conversion of mass into energy.

Explanation:

In nuclear fusion reactions, energy is released because the mass of the original nucleus is greater than the mass of the products. This is based on the concept of mass-energy equivalence, as described by Einstein's equation E=mc². The missing mass in the reaction is converted into energy, and the products of the fusion reaction have a greater binding energy per nucleon (BE/A). Therefore, the larger nucleus formed in the fusion reaction has a greater binding energy and less mass per nucleon, resulting in the release of energy.

The answer is Solvent. The reason is in the wording, 'the substance that does the dissolving.' A solvent does the dissolving, a solute is something that can be dissolved.

Answer:

solvent

Explanation:

1. When the object is waiting to be released, it is storing a lot of potential energy. When it is released, the potential energy that was once stored is converted into kinetic energy.

d work = force times distance ... if force is constant

Answer:

Work, W =Fd

Explanation:

Work is said to be done when a force is applied on an object in order to create some displacement. The mathematical expression for work done is given as:

W = F. d

Where

F is the applied force

d is the displacement

Work done also depend on the angle between the force and the displacement i. e.

[tex]W=Fd\ cos\ \theta[/tex]

[tex]\theta[/tex] is the angle between F and d

When the force and displacement are in same direction then [tex]\theta=0[/tex]. It gives W = F. d

When the force and displacement are perpendicular to each other, [tex]\theta=90[/tex]. It gives W = 0

Similarly, When force and displacement are in opposite direction, [tex]\theta=180[/tex]. It gives W = - F. d

So, the correct option is (D) '' W =Fd ''

Answer:

The height of the cliff in meters = 27.44

Explanation:

 The potential energy of a body is given by the expression, PE = mgh, where m is the mass of the body, g is the acceleration due to gravity value and h is the height of the body.

 Here we have mass of rock = 13 kg

                          Potential energy = 3500 J

                          Acceleration due to gravity  = [tex]9.81m/s^2[/tex]

                          Substituting   3500 = 13 * 9.81 * h

                                                       h = 27.44 meter

      The height of the cliff in meters = 27.44

Answer;

Logical behaviorism

Explanation;

Behaviorism is a learning theory that only focuses on objectively observable behaviors and discounts any independent activities of the mind. Behavior theorists define learning as nothing more than the acquisition of new behavior based on environmental conditions.

Logical behaviorism is at odds with our commonsense intuition that mental states cause behavior.

A. elastic motion because that's the answer

The given statement is an example of one form of energy is  being converted to another

Answer: Option D

Explanation:

A car is is stopped due to the application of brakes to bring it back to rest. This is an example of kinetic energy as work is done to stop the car. When brakes are applied, heat is produced due to the friction between the wheels and the brakeshoes which is an example of heat or thermal energy. Hence kinetic energy is transformed into thermal energy in this application.

Kinetic energy is the amount of energy a object has while it's in motion, and thermal energy is heat energy. In this case when the heat rises in substances for example a solid it will transform into a liquid causing the molecules to move faster which is a increase of kinetic energy. So the answer is "when the heat in substances increase the kinetic energy increases."

Hope this helps!

Answer:

All matter is made up of particles that are constantly moving. The motion of the particles results in kinetic energy. The part of total internal energy that can be transferred is thermal energy. As temperature increases, the particles in a substance move faster and have greater kinetic and thermal energy.

Answer:

10lb

Explanation:

1. The red ball was potential energy until it was hit by the pendulum converting into kinetic energy.

2. The 5 pounds was a potential energy, until the rope was cut by the scissors, this made the 5 pounds become kinetic energy.

3. The bucket was a potential energy, till the books landed in it causing it to fall, this became kinetic energy

Examples of potential energy being converted into kinetic energy include a roller coaster ride simulation, the operation of a combustion engine, and an activity in the Snap Lab.

Potential energy is converted into kinetic energy in various instances during lab activities. Here are three specific examples:

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Stars exhibit a diverse range of temperatures and luminosities, determining their colors and types. The HR Diagram helps classify them, with main sequence stars like the sun, high-temperature blue supergiants, low-temperature red dwarfs, and evolved stars such as white dwarfs and red supergiants, showcasing the rich tapestry of stellar evolution.

5 - The color of the stars with the highest surface temperature is blue.

Stars emit different colors of light depending on their temperature. Higher temperatures, like those of blue stars, result in shorter wavelengths, while lower temperatures, like those of red stars, result in longer wavelengths.

6 - The color of the stars with the lowest surface temperature is red.

Red stars generally have lower surface temperatures, and they emit light at the longer, red end of the spectrum.

7 - The color of the stars from hottest to coldest is: blue, white, yellow, orange, red.

The sequence represents the color of stars from the hottest (blue) to the coolest (red). White stars fall between blue and yellow.

8 - Most of the stars on the HR Diagram are classified as main sequence stars.

The Hertzsprung-Russell (HR) Diagram is a graph of stars' luminosity (brightness) against their surface temperature. Most stars, including our Sun, fall into the main sequence category, where they spend the majority of their lives.

9 - The type of star that has a high temperature but a low luminosity is a white dwarf.

White dwarfs are hot but have low luminosity because they are small and no longer undergoing nuclear fusion in their cores.

10 - The type of star that has a high temperature and high luminosity is a blue supergiant.

Blue supergiants are massive stars with high temperatures and luminosities. They are in the later stages of their evolution and have expanded in size.

11 - The type of star that has a low temperature but high luminosity is a red supergiant.

Red supergiants are large, cool stars with high luminosities. They are in the late stages of their evolution.

12 - The type of star that has low temperature and low luminosity is a red dwarf.

Red dwarfs are small, cool stars with relatively low luminosities. They are the most common type of star in the universe.

Plotting Table: Letter - Temperature - Luminosity - Color - Type Of Star

A - 6,000 K - 10^1 - Yellow - Main Sequence

B - 20,000 K - 10^6 - Blue - Blue Supergiant

C - 20,000 K - 10^3 - White - White Dwarf

D - 2,500 K - 10^2 - Red - Red Supergiant

E – 4000 K – 10^-2 - Orange - Red Dwarf