What do you observe when you hold your largest plastic shopping bag square between the light source and the wall

Energy is an important concept that affects us in many ways. It is the ability to do work, and it can come in many forms. When it comes to a water balloon, it has several types of energy that explain its behaviour.

Types of Energy: The water balloon has potential energy, which is stored energy due to its position or shape. This potential energy is converted to kinetic energy when the balloon is thrown. Kinetic energy is the energy of motion, so as the balloon moves, it has kinetic energy.

The balloon also has thermal energy, which is energy that comes from the temperature of the water in the balloon. As the water inside the balloon heats up, the thermal energy increases and the balloon becomes more elastic.

Behaviour: The water balloon's behaviour can be explained by the energy it contains. The potential energy it has will cause it to move when it is released, resulting in its kinetic energy. The thermal energy can cause the balloon to expand and become more elastic, making it more likely to burst when hit by an object. The combination of these energies explains why the balloon behaves the way it does.

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By applying this rule, you can determine the force between objects at any given distance by comparing it to the force measured at a reference distance.

F1 / F2 = \((r2 / r1)^2\)

The rule based on the measured force between objects that are 10 meters apart to find the force between objects at any distance apart is as follows:

"The force between two objects is inversely proportional to the square of the distance between them."

Mathematically, this can be expressed as:

F1 / F2 = \((r2 / r1)^2\)

Where:

F1 is the measured force between objects at a distance r1.

F2 is the force between objects at a distance r2.

r1 is the initial distance between the objects where the force was measured.

r2 is the new distance between the objects at which the force is to be calculated.

By applying this rule, you can determine the force between objects at any given distance by comparing it to the force measured at a reference distance.

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Answer:

True

Explanation:

Incandescence material are those which glow on being heated above a particular point.  For example an incandescence bulb which has a filament. when the filament is heated it starts to glow.

The least energy efficient type of electronic lights typically used in residential buildings are usually called incandescent lamps. Although ineffective, incandescent lamps provide a variety of important advantages, they are inexpensive to purchase, turn on instantly and are available in a wide range of sizes and shapes.

Answer:

100 m/s^{2}

Explanation:

the given information we have is:
vi = 30m/s

vf = 20m/s

t = 0.10s

we need to find a so we will use the following kinematics equation

\(vf=vi+at\)

we can rearrange the equation so it will give us our desired answer like so:

\(a = \frac{vf-vi}{t}\)

now we can plug in our given numbers

\(a = \frac{20 m/s - 30 m/s}{0.10s}\)

which will equal

\(100 m/s^{2}\)

A load cell is an essential sensor device used for converting a force, torque, pressure, or displacement into an electrical signal. It is a key component in electronic scales, force measuring instruments, and weighing devices. A student who designs an electric scooter uses a simple column type load cell with two strain gauges.

The load cell measures force or weight by converting the tension or compression acting on the load cell into an electrical signal. A load cell typically comprises four strain gauges that are arranged in a Wheatstone bridge configuration. A column type load cell is cylindrical in shape and is designed to measure loads in compression. It typically comprises two columns that are connected by a metal diaphragm. Two strain gauges are attached to the columns, one for measuring the compressive strain and the other for measuring the tensile strain.

The student designing an electric scooter uses a load cell to measure the weight of the rider and other loads on the scooter. The load cell is typically placed at the bottom of the scooter's frame, and the weight of the rider and the scooter is applied to it. The load cell measures the weight by converting the compression force acting on it into an electrical signal. The two strain gauges attached to the columns of the load cell measure the compressive and tensile strains, respectively. These strains are converted into an electrical signal using a Wheatstone bridge circuit, and the output of the bridge is proportional to the weight applied to the load cell.The student designing the electric scooter needs to select the right load cell for the application. The load cell must be able to measure the maximum weight that the scooter can carry. The column type load cell is suitable for measuring loads in compression, which is ideal for measuring the weight of the rider and the scooter. The two strain gauges attached to the columns of the load cell help to increase the sensitivity and accuracy of the load cell. The Wheatstone bridge circuit helps to convert the strain measurements into an electrical signal that can be processed by the scooter's control system.

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Answer:

(a) h = 5.1 m

(b) v = 14.13 m/s

Explanation:

(a)

We will use the law of conservation of energy. For this situation it states that:

Loss in Potential Energy of Sphere = Gain in Kinetic Energy of the Sphere

mgh = (1/2)mv²

h = v²/2g   --------------- equation (1)

where,

h = height = ?

v = speed at lowest point = 10 m/s

g = 9.8 m/s²

Therefore,

h = (10 m/s)²/(2)(9.8 m/s²)

h = 5.1 m

(b)

using the equation (1)

h = v²/2g

v = √2gh

where,

v = velocity = ?

g = 9.8 m/s²

h = height = 2(5.1 m) = 10.2 m

Therefore,

v = √[2(9.8 m/s²)(10.2 m)]

v = 14.13 m/s

The height from which the sphere was released is 5.1 m

When the height is doubled, the speed of the sphere becomes 14.14 m/s.

The given parameters:

The height from which the sphere was released is calculated as follows;

\(P.E = K.E\\\\mgh = \frac{1}{2}mv^2\\\\gh = \frac{1}{2}v^2\\\\h = \frac{v^2}{2g}\\\\h = \frac{(10)^2}{2(9.8)} \\\\h = 5.1 \ m\)

When the height is doubled, the speed of the sphere becomes;

\(h = \frac{v^2}{2g} \\\\v^2 = 2gh\\\\v = \sqrt{2gh} \\\\v = \sqrt{2 \times 9.8 \times (2 \times 5.1)} \\\\v = 14.14 \ m/s\)

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The radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\). To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei using Avogadro's number and the decay constant. For the activity after 10 years, use the radioactive decay law with the appropriate values.

a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be written as follows:

\(Th^{232} - > Ra^{228} + He^{4}\)

In this equation, thorium-232 undergoes alpha decay, transforming into radium-228 and emitting an alpha particle (helium-4 nucleus).

b) To find the radioactive radiation activity of 10 g of thorium, we need to calculate the number of thorium-232 nuclei in the given sample. First, we find the number of moles of thorium-232 by dividing the mass of the sample by its molar mass. The molar mass of thorium-232 is approximately 232 g/mol. Thus, the number of moles is:

Number of moles = 10 g / 232 g/mol

Next, we calculate the number of thorium-232 nuclei using Avogadro's number, which is approximately 6.022 × \(10^{23}\) nuclei/mol:

Number of nuclei = Number of moles × Avogadro's number

Finally, we determine the radioactive radiation activity (A) by multiplying the number of nuclei by the decay constant (λ). The decay constant (λ) is related to the half-life (T1/2) of thorium-232 through the equation:

λ = ln(2) / T1/2

The decay constant represents the probability of decay per unit time. Therefore, the activity can be calculated as:

Activity = λ × Number of nuclei

c) To find the activity after 10 years, we use the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially with time. The remaining activity (A_t) after a given time (t) is given by the equation:

\(A_t = A_0 * (1/2)^{t/T1/2}\)

Where A_0 is the initial activity at t = 0. Substituting the initial activity calculated in part b, the decay constant, and the desired time of 10 years, we can determine the activity after 10 years.

In summary, the radioactive decay equation for thorium-232 is \(Th^{232} - > Ra^{228} + He^{4}\) . To find the radioactive radiation activity of 10 g of thorium, calculate the number of nuclei and multiply it by the decay constant. For the activity after 10 years, use the radioactive decay law and substitute the appropriate values.

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Answer:

Explanation:

Answer:

In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.

Explanation:

hope you get it right

  :)

Answer: Found this in google. Statement based on repeated experiments or observations, that describe or predict a range of natural phenomena. Hope this helps!

Explanation:

to find the modulus of elasticity MoE at 23% of moisture content based on the already given modulus of elasticity of 12% moisture content we need to consider a shrinkage behavior of material. the expected MoE comes out to be approximately \(6,836 N/mm².\)

given information:

Modulus of elasticity at 12% moisture content =7,920 N/mm²

resultant shrinkage or final shrinkage percentage FSP = 30%

To calculate the expected MoE at 23% moisture content we have the following equation:

MoE-23% =   \(MoE-12%\) \((1 - FSP (23 - 12) / (100 - 12))\)

MoE-23% = \(7,920 N/mm² × (1 - 0.30 × (23 - 12) / (100 - 12))\)

MoE-23% =\(7,920 N/mm² × (1 - 0.30 × 11 / 88)\)

MoE-23% = \(7,920 N/mm² × (1 - 0.1364)\)

MoE-23% = \(7,920 N/mm² × 0.8636\)

MoE-23% =  \(6,836 N/mm²\)

therefore the expected modulus of elasticity at 23% moisture content comes out to be approx \(6,836 N/mm²\).

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Answer:

Explanation:

There are three states of matter; solid, liquid and gaseous states.

The solid state of matter has it's particles tightly packed with very restricted  or no movement within the molecule hence the reason for it's definite shape.

The liquid state of matter has it's particles with a free movement (better than solid but not as free as gases) within the molecule hence it's particles are loosely packed within the molecule. Hence, they (liquids) assume the shape of the container in which they are stored and they move freely when released from the container.

The gaseous state of matter has it's particles totally loosely packed as a result of it's particles moving freely and colliding against one another.

Thus, we can use the above descriptions to answer the statements from the question.

1) The atoms in a  ----- are closely packed, but able to slide past each other. Answer: From the description above, it can be deduced that the atoms here are in a solid because the particles within a solid are closely packed.

2) The atoms in a  -------- spread as far apart as possible.

Answer: The atoms here are in gaseous form because, as described earlier, they are loosely packed and  can thus be as far apart as possible.

3) A  ----- has a definite shape and volume.

Answer: As described earlier, a solid substance would have a definite shape and volume because it's particles are tightly packed.

4) The shape of a  ----- can change, but the volume is definite.

Answer: The substance here is a liquid because the particles are free (but not as free as gases) and would have a definite volume but will assume the shape of the any container they are placed in (hence they have an irregular shape).

Answer:

The atoms in a

✔ liquid

are closely packed, but able to slide past each other.

The atoms in a

✔ gas

spread as far apart as possible.

A

✔ solid

has a definite shape and volume.

The shape of a

✔ liquid

can change, but the volume is definite.

Explanation:

Answer:

A. Pu -239

Explanation:

An isotope is an element with the same atomic number but different mass number. most isotope are unstable, having short half life.

Curium-242 is an isotope produced when Plutonium 239 is bombarded by an alpha particle. This reaction between Plutonium 239 and alpha particle gives curium-242, neutron and a high amount of energy as the products.

Curium oxidizes easily, and it is a dangerous metal which can cause cancer initiation when absorbed by biological materials e.g bones or tissue.

Answer:

D. ) The force would be zero newtons

Explanation:

Because

If you are at the center of the earth, gravity is zero because all the mass around you is pulling "up" (every direction there is up!)

So F=mg so if g is zero F is also zero

Answer:

B. An equation that can be used to accurately calculate the pull of gravity between two objects

Explanation:

The scientific way of thinking uses research, making hypotheses, testing the hypothesis with experiments, analyzing the data, and getting results. An equation is the result of this process, so using the equation is a scientific way of thinking. Therefore, the answer is:

B. An equation that can be used to accurately calculate the pull of gravity between two objects

H = Pu / P x 100% = 360/750 x 100% = 48%

P/s: Pu is the useful power outlet of the leaf blower

P is the total power input to the leaf blower

ok done. Thank to me :>

Answer:

Moment of Inertia, I = 0.016 kgm²

Explanation:

Mass of the ball, m = 0.20 kg

Length of the pitcher's arm, l = 0.28

Radius of the circular arc, r = 0.28 m

Moment of Inertia is given by the formula:

I = mr²

I = 0.20 * 0.28²

I = 0.20 * 0.0784

I = 0.01568

I = 0.016 kgm²

Answer:

\(11.3\ \text{g/cm}^3\)

\(7.92\ \text{g/cm}^3\)

\(238.1\ \text{cm}^3\)

Explanation:

8) Volume of lead

\(V=4.5\times 5.2\times 6\\\Rightarrow V=140.4\ \text{cm}^3\)

m = Mass of block = 1587 g

Density is given by

\(\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{1587}{140.4}\\\Rightarrow \rho=11.3\ \text{g/cm}^3\)

Density of lead is \(11.3\ \text{g/cm}^3\)

9) Volume of lead = Volume of water displaced = (49.1-45.5) = 3.6 mL = \(3.6\ \text{cm}^3\)

m = Mass of iron = 28.5 g

Density is given by

\(\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{28.5}{3.6}\\\Rightarrow \rho=7.92\ \text{g/cm}^3\)

The density of iron is \(7.92\ \text{g/cm}^3\)

10) m = Mass of silver = 2500 g

\(\rho\) = Density of silver = \(10.5\ \text{g/cm}^3\)

Volume is given by

\(V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{2500}{10.5}\\\Rightarrow V=238.1\ \text{cm}^3\)

The volume of silver is \(238.1\ \text{cm}^3\)

42000 kilometers

Explanation:

distance is velocity × time

28000 ×1.5

42000

remember to match units

thats why i wrote 1.5 hours instead of 90minutes

Answer:

a) In order for the riders to stay pinned against the inside of the drum when the floor drops away, the force of friction between the drum and the riders must be greater than or equal to the force of gravity pulling them down.The maximum force of friction that can be exerted on a rider is given by:f_max = μNwhere μ is the coefficient of static friction and N is the normal force acting on the rider.At the minimum speed required for the riders to stay pinned against the inside of the drum, the normal force acting on each rider is equal to their weight, so:N = mgwhere m is the mass of the rider and g is the acceleration due to gravity.The force of gravity pulling the rider down is:F = mgTherefore, the minimum speed required for the riders to stay pinned against the inside of the drum is given by:f_max = FμN = mgv_min = sqrt(rgμ)where r is the radius of the drum, which is half of the diameter, so r = 5m.Plugging in the values, we get:v_min = sqrt(59.80.15) = 2.16 m/sb) The angular velocity of the drum at this speed can be found using the formula:v = ωrwhere v is the linear velocity of the riders at the minimum speed required to stay pinned against the inside of the drum, r is the radius of the drum, and ω is the angular velocity of the drum.Rearranging this equation to solve for ω, we get:ω = v/rPlugging in the values, we get:ω = 2.16/5 = 0.432 rad/sSo the angular velocity of the drum at the minimum speed required for the riders to stay pinned against the inside of the drum is 0.432 rad/s.

Answer:

5km 1 hour

Explanation:

Answer:The disturbance created by a source of sound in the medium travels through the medium and not the particles of the medium

Explanation:i hope this is right

According to Newton's law, action and reaction are equal and opposite.

According to the Newton's third law of motion, action and reaction are equal and opposite. As such, when the arrow hits the vertical wood board, the board exerts some force on the arrow.

We can not determine the magnitude of this force numerically because the question is incomplete.

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Answer:

newtons law action and reaction are equal and opposite

Explanation:

To determine which of the four general expansion models best describes the present-day universe, we must rely on observational evidence. Accurate measurements of distances between galaxies and the masses of galactic central supermassive black holes are essential for making these determinations.

One effective method for measuring distances involves using standard candles, such as white dwarf supernovae, which allow us to gauge distances accurately. Another approach involves observing active galactic nuclei X-ray and gamma-ray bursts, which also serve as reliable distance indicators.

Additionally, measuring the masses of galactic central supermassive black holes can provide insight into the expansion model. Mapping the relative speeds of stellar clusters and examining the relative amounts of gas and stars in galaxies are suitable techniques for obtaining such measurements.

In summary, a combination of accurate distance measurements using standard candles like white dwarf supernovae and active galactic nuclei bursts, along with mass measurements of galactic central supermassive black holes, can help us identify the most appropriate expansion model for the present-day universe.

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To fill in the missing values for KE and GPE in the table, we can use the conservation of energy principle which states that the total mechanical energy of a system (ME) is conserved and remains constant as long as there are no external forces acting on the system.

At the maximum height of 3 m, the basketball is not moving, so all of its energy is potential energy, i.e., GPE = 18 J and KE = 0 J.

Using the principle of conservation of energy, we can calculate the values of KE and GPE at the other heights:

At a height of 2 m, the basketball has lost some potential energy as it has moved down, but it has not gained any kinetic energy yet, so KE = 0 J. Therefore, GPE = 12 J.

At a height of 1 m, the basketball has lost some potential energy and gained some kinetic energy. We can calculate the KE as the difference between the ME at heights of 2 m and 1 m, i.e., KE = ME(2 m) - ME(1 m) = (12 J) - (6 J) = 6 J. Therefore, GPE = 6 J.

At a height of 0 m, the basketball has lost all of its potential energy and gained an equal amount of kinetic energy, i.e., KE = GPE = 18 J.

The mechanical energy (ME) at each height can be calculated as the sum of KE and GPE:

ME(3 m) = KE + GPE = 0 J + 18 J = 18 J

ME(2 m) = KE + GPE = 0 J + 12 J = 12 J

ME(1 m) = KE + GPE = 6 J + 6 J = 12 J

ME(0 m) = KE + GPE = 18 J + 0 J = 18 J

Therefore, the mechanical energy of the basketball remains constant at 18 J at the maximum height and at the ground level, and decreases to 12 J at a height of 2 m and then increases back to 18 J at a height of 0 m.

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The reading on the weighing machine when the marble is completely immersed will be less than 57.5N,

When the marble is completely immersed in water, the reading of the spring balance will remain the same, at 14N. The spring balance measures the weight of the marble, which is determined by its mass and the acceleration due to gravity. Immersing the marble in water does not change its mass or the gravitational pull, so the weight remains constant.

However, the reading of the weighing machine will change when the marble is immersed. The weighing machine measures the force exerted on it by an object, which is equal to the weight of the object. When the marble is immersed in water, it experiences a buoyant force exerted by the water, which partially counteracts its weight. The buoyant force is equal to the weight of the water displaced by the marble, according to Archimedes' principle.

Since the marble's relative density is given as 2.8, which is greater than 1, it will sink in water. As a result, the buoyant force will be less than the weight of the marble. Therefore, the reading on the weighing machine when the marble is completely immersed will be less than 57.5N, indicating the reduced effective weight of the marble in water. The exact reading on the weighing machine can be calculated by subtracting the buoyant force from the weight of the marble.

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Answer:

D

Explanation:

Also the capitol of Utah is Salt Lake City

Hope this helps!

Answer:

Utah

Explanation:

The Great Salt Lake, located in the northern part of the U.S. state of Utah, is the largest salt water lake in the Western Hemisphere, and the eighth-largest terminal lake in the world.

Answer

30 mi/gal * (1.61 km / mi ) /  (3.78 L/gal)   = 30 * .426 km/L = 12.8 km/L