An escalator carries you from one level to the next in an airport terminal. The upper level is 4.4m above the lower level, and the length of the escalator is 7.3m . Assume that your mass is 63kg .
Part A
How much work does the up escalator do on you when you ride it from the lower level to the upper level?
Part B
How much work does the down escalator do on you when you ride it from the upper level to the lower level?

To freeze the liquid, the amount of heat that needs to be removed is determined by multiplying the mass of the liquid by the heat of fusion (Lf).

To boil the liquid, the amount of heat that needs to be added is determined by multiplying the mass of the liquid by the heat of vaporization (Lv).

The amount of heat required to freeze or boil a substance can be calculated using the formulas Q = m * Lf and Q = m * Lv, respectively. In these formulas, Q represents the amount of heat, m represents the mass of the substance, Lf represents the heat of fusion, and Lv represents the heat of vaporization. By substituting the given values of Lf and Lv, and knowing the mass of the liquid, one can calculate the required amount of heat for freezing or boiling the liquid.

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Answer:

Probably not climate technically is based off conditions in areas in a general terms or over long periods of time.

Answer:

about 3 days

It takes about 3 days for a spacecraft to reach the Moon. During that time a spacecraft travels at least 240,000 miles (386,400 kilometers) which is the distance between Earth and the Moon. The specific distance depends on the specific path chosen.

Explanation:

no explanation

In conclusion, discrete numerical modeling of loose soil with spherical particles and interparticle rolling friction involves representing particles as discrete entities and simulating their interactions using mathematical equations. This approach allows us to study the behavior of loose soil and gain insights into its properties and response under different conditions.

Discrete numerical modeling is a technique used to simulate the behavior of loose soil with spherical particles and interparticle rolling friction. In this approach, the soil is represented by discrete particles, and their interactions are modeled using mathematical equations.
To simulate the behavior of loose soil, the following steps are typically involved:
1. Particle representation: Each particle in the soil is represented as a discrete entity with its own properties, such as size, shape, and material properties.
2. Interaction modeling: The interactions between particles are modeled based on physical principles, such as interparticle rolling friction. These interactions affect the movement and behavior of the particles.
3. Numerical simulation: Mathematical equations are used to simulate the motion of particles over time. These equations consider various factors, such as gravitational forces, interparticle friction, and contact forces between particles.
4. Solution calculation: The equations are solved numerically to obtain the positions and velocities of the particles at each time step.
5. Analysis and conclusion: The simulation results are analyzed to gain insights into the behavior of loose soil. This analysis can include studying the particle arrangements, deformation patterns, and other properties of the soil under different conditions.
In conclusion, discrete numerical modeling of loose soil with spherical particles and interparticle rolling friction involves representing particles as discrete entities and simulating their interactions using mathematical equations. This approach allows us to study the behavior of loose soil and gain insights into its properties and response under different conditions.

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Answer:

there's a center of the earth..and there is every later of it..just like in a movie...it is true

Answer:

The layers of rock at Earth ’s surface contain evidence of the evolutionary processes undergone by these components of the terrestrial environment during the times at which each layer was formed. By studying this rock record from the very beginning, it is thus possible to trace their development and the resultant changes through time.

Answer:

The formation of volcanic arcs, trenches and subsidence leads to the production of volcanic eruptions.

Explanation:

Answer:

a. Hooke's law is a principle in physics that states that the force required to extend or compress a spring or elastic material is directly proportional to the displacement of its end or deformation.

b. The formula for resistance of a wire is given by:

R = (ρL)/A

where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.

Given L = 10m, A = 0.1 mm² = 0.1 x 10^-6 m², and ρ = 50 µcm = 50 x 10^-8 Ωm, we have:

R = (50 x 10^-8 x 10) / (0.1 x 10^-6)

R = 5 Ω

Therefore, the resistance of the wire is 5 Ω.

The formula for Young's modulus is given by:

Y = F L / A ΔL

where Y is Young's modulus, F is force, L is length, A is cross-sectional area, and ΔL is the change in length.

Given F = 2 kgf = 2 x 9.81 N, L = 2 m, d = 0.64 mm = 0.64 x 10^-3 m, and ΔL = 0.60 mm = 0.60 x 10^-3 m, we have:

A = πd²/4 = π(0.64 x 10^-3)²/4 = 3.21 x 10^-7 m²

Y = (2 x 9.81 x 2) / (3.21 x 10^-7 x 0.60 x 10^-3)

Y ≈ 1.24 x 10^11 N/m²

Therefore, the Young's modulus of the wire is approximately 1.24 x 10^11 N/m².

Explanation:

Answer:

4.61 N

Explanation:

masa = 0.5 kg

ángulo de inclinación = 20°

Peso normal de la masa = mg

donde m = masa

g = aceleración debido a la gravedad = 9.81 m/s^2

Peso normal = 0.5 x 9.81 = 4.905 N

Si la masa se mantiene en su lugar mediante una cuerda paralela al plano, y no hay fricción en la masa, entonces

La fuerza sobre la cuerda = peso normal x cos ∅

donde ∅ = 20 °

La fuerza sobre la cuerda = 4.905 x cos 20°

==> 4.61 N

An Electron will undergoes the lesser acceleration

An electron is a negatively charged particle of equivalent magnitude to a proton, which is positively charged. Therefore, they will feel the same amount of electric force when exposed to an electric field. As a result, the relationship between acceleration and mass will be inverse. An electron will accelerate more quickly than a proton because an electron has a lower mass.

Due to their opposite polarity, an electron and a proton are attracted to one another by an electrical force of equal strength when they are placed in an electric field. However, because of their opposing charges, the force will act in the opposite direction.

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The production function will have constant returns to scale if 2αβ = 1

Constant returns to scale (CRS) implies that if all inputs increase by a factor of λ, the output increases by λ as well. The requirement for constant returns to scale (CRS) in a Cobb-Douglas production function with a new input factor is given by the sum of exponents on all variables equal to 1.

In this case, Y = AKαLβMγ.

Thus, we have that α + β + γ = 1 for constant returns to scale in K, L, and M, because the sum of the exponents is 1.

If the sum of the exponents is less than 1, it indicates decreasing returns to scale. If the sum of the exponents is greater than 1, it indicates increasing returns to scale. If we take γ = 0, we obtain the production function used in class, which is Y = AKαLβ, thus α + β = 1 for constant returns to scale in K and L.

When γ = 0, the answer we get is consistent with what we learned in class. Now, we consider the constant elasticity of substitution (CES) technology, where Y = [aKα + bLα]β. The production function will have constant returns to scale (CRS) in K and L if the sum of the exponents of K and L is equal to 1.

Therefore, αβ + αβ = 1, implying 2αβ = 1.

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a) The period of the wave is 6.24 s.

b)The frequency of the wave is 0.16 Hz.

c)The wavelength of the wave is 33.8 m.

d)The speed of the wave is 5.408 m/s.

This problem deals with the properties of waves. When a wave passes by, it has certain characteristics that we can measure, including its period, frequency, wavelength, and speed.

In this scenario, a woman is standing in the ocean and observes the passage of waves. She notices that after one wave crest passes by, five more crests pass in a time of 31.2 s. This information can be used to calculate the wave's properties.

(a) The period of a wave is the time it takes for one complete cycle to occur. In this case, we can use the information given to calculate the period as follows:

One crest passes by in T seconds.
Five more crests pass in 31.2 seconds.
Therefore, six crests pass in (T + 31.2) seconds.

So, the period (T) can be found by dividing the time by the number of crests:
T = (T + 31.2)/6
6T = T + 31.2
5T = 31.2
T = 6.24 s

Therefore, the period of the wave is 6.24 s.

(b) The frequency of a wave is the number of cycles per second. It is the inverse of the period. So, the frequency (f) can be calculated as:

f = 1/T
f = 1/6.24
f = 0.16 Hz

Therefore, the frequency of the wave is 0.16 Hz.

(c) The wavelength of a wave is the distance between two successive crests. In this case, the distance between two successive crests is given as 33.8 m. Therefore, the wavelength (λ) can be calculated as:

λ = 33.8 m

Therefore, the wavelength of the wave is 33.8 m.

(d) The speed of a wave is the product of its frequency and wavelength. Therefore, the speed (v) can be calculated as:

v = fλ
v = 0.16 x 33.8
v = 5.408 m/s

Therefore, the speed of the wave is 5.408 m/s.

In conclusion, the woman standing in the ocean observes the passage of waves and we can use the information given to calculate the wave's period, frequency, wavelength, and speed. This problem helps us understand the properties of waves and how we can calculate them using simple formulas.

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The magnetic field created by the current and the direction of the magnetic field relative to the direction of the magnetic force on the ball determine the direction of the current that must flow in order to lift the ball up along the z direction.

A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or space is referred to as an electric current. The net rate of passage of electric charge through a surface or into a control container is monitored. Electric current refers to the flow of electricity in an electrical circuit as well as the amount of electricity flowing through a circuit. It is measured in amperes (A). The higher the ampere value, the more electricity flows across the circuit.

Here,

The direction of the current is often determined by applying the right-hand rule to the magnetic field and the direction of the force on the conductor. However, without further information on the intricacies of the arrangement and the exact orientation of the magnetic field, determining the exact direction of the current is impossible.

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Let's calculate the values based on the given information:

The area of the wooden block can be calculated by multiplying the length and width of one of its faces:

Area = Length * Width

Area = 40 cm * 20 cm

Area = 800 cm²

To convert to square inches, we can use the conversion factor 1 inch = 2.54 cm:

Area in square inches = Area in square centimeters / (2.54 cm/inch)²

Area in square inches = 800 cm² / (2.54 cm/inch)²

Area in square inches ≈ 124.03 in²

The volume of the wooden block can be calculated by multiplying its length, width, and height:

Volume = Length * Width * Height

Volume = 40 cm * 20 cm * 10 cm

Volume = 8000 cm³

To convert to cubic inches, we can use the conversion factor 1 inch = 2.54 cm:

Volume in cubic inches = Volume in cubic centimeters / (2.54 cm/inch)³

Volume in cubic inches = 8000 cm³ / (2.54 cm/inch)³

Volume in cubic inches ≈ 488.19 in³

The density of the wooden block can be calculated by dividing its mass by its volume:

Density = Mass / Volume

Density = 5 kg / 8000 cm³

To convert to grams per cubic centimeter (g/cm³), we can use the conversion factor 1 kg = 1000 g:

Density in g/cm³ = Density in kg/cm³ * 1000 g/kg

Density in g/cm³ = (5 kg / 8000 cm³) * 1000 g/kg

Density in g/cm³ ≈ 0.625 g/cm³

To convert to pounds per cubic inch (lb/in³), we can use the conversion factor 1 kg = 2.20462 lb and 1 inch = 2.54 cm:

Density in lb/in³ = Density in kg/cm³ * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ = (5 kg / 8000 cm³) * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ ≈ 0.036 lb/in³

Pressure is defined as force divided by area. In this case, we need more information to calculate the pressure. If the block is subjected to a specific force, we can divide that force by the appropriate surface area to find the pressure.

The pressure on the top surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

Similarly, the pressure on the bottom surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

The force on the top surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

The force on the bottom surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

Without the values for forces on the top and bottom surfaces, we cannot determine the difference between them.

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1. The area of the wooden block can be calculated using the formula for the surface area of a rectangular prism: SA = 2(lw + lh + wh), where l, w, and h are the length, width, and height of the block, respectively. Using the given dimensions, we can find the surface area in cm²:

SA = 2(40 × 20 + 40 × 10 + 20 × 10)

SA = 2(800 + 400 + 200)

SA = 2(1400)

SA = 2800 cm²

To convert cm² to in², we can use the conversion factor 1 in² = 6.45 cm². So, the area in in² is:

2800 ÷ 6.45 = 434.96 in² (rounded to two decimal places)

2. The volume of the wooden block can be calculated using the formula for the volume of a rectangular prism: V = lwh. Using the given dimensions, we can find the volume in cm³:

V = 40 × 20 × 10

V = 8000 cm³

To convert cm³ to in³, we can use the conversion factor 1 in³ = 16.39 cm³. So, the volume in in³ is:

8000 ÷ 16.39 = 487.61 in³ (rounded to two decimal places)

3. The density of the wooden block can be calculated using the formula: density = mass/volume. The mass of the block is given as 5 kg. To convert this to grams, we can use the conversion factor 1 kg = 1000 g. So, the mass in grams is:

5 kg × 1000 g/kg = 5000 g

Using the volume calculated in part 2, we can find the density in g/cm³:

density = 5000 g/8000 cm³

density = 0.625 g/cm³

To convert g/cm³ to lb/in³, we can use the conversion factor 1 g/cm³ = 0.0361 lb/in³. So, the density in lb/in³ is:

0.625 g/cm³ × 0.0361 lb/in³/g/cm³ = 0.0226 lb/in³

4. The pressure on the wooden block is given by the formula: pressure = force/area. To find the pressure, we need to know the force acting on the block. Since the block is simply resting on the tabletop, the force acting on it is due to its weight. Using the formula for weight: w = mg, where w is weight, m is mass, and g is the acceleration due to gravity (9.8 m/s²).

To find the weight in newtons (N), we can use the conversion factor 1 kg = 9.8 N. So, the weight of the block is:

5 kg × 9.8 N/kg = 49 N

Using the area of the block's base (40 cm × 20 cm = 800 cm²), we can find the pressure in N/cm²:

pressure = 49 N/800 cm²

pressure = 0.06125 N/cm²

To convert N/cm² to psi, we can use the conversion factor 1 psi = 6894.76 N/m². So, the pressure in psi is:

0.06125 N/cm² × (1 m²/10,000 cm²) × (1 psi/6894.76 N/m²) = 0.0089 psi (rounded to four decimal places)

5. The pressure on the top surface of the wooden block is the same as the pressure calculated in part 4: 0.06125 N/cm² or 0.0089 psi.

6. To find the pressure on the bottom surface of the block, we can use the formula: pressure = force/area. Since the bottom surface has the same area as the top surface, the pressure will also be the same: 0.06125 N/cm² or 0.0089 psi.

7. The force acting on the top surface of the wooden block is simply its weight, which we calculated to be 49 N in part 4.

8. The force acting on the bottom surface of the wooden block is also its weight, which we calculated to be 49 N in part 4.

9. The force on the bottom surface is equal in magnitude to the force on the top surface.

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The buoyant force exerted on the balloon is 0.08 N (approx).

The density of helium gas is given to be 0.2 kg/m³.

Given that, a balloon has a volume of 6 x 10⁻³ m³.

Therefore, the mass of the helium gas in the balloon is:

                Mass of helium gas = Density × Volume= 0.2 kg/m³ × 6 x 10⁻³ m³= 0.0012 kg

The density of air is given to be 1.3 kg/m³.

Therefore, the buoyant force exerted on the balloon is:

                Buoyant force = Weight of the displaced air= Density of air × Volume of displaced air × g= 1.3 kg/m³ × 6 x 10⁻³ m³ × 9.8 m/s²= 0.076 N

Therefore, the buoyant force exerted on the balloon is 0.08 N (approx).

Hence, the correct option is "0.08 N." Note: Always double-check the formula, values provided, and units used before solving any physics problem.

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Answer:

it makes most recourses and gives us most of a materials

Explanation:

Answer:

(a)  333.77 J

(b) 237.85 J

(c) 4763.77 J

(d) 4667.85 J

Explanation:

Temperature of source, TH = 314 K

Temperature of A, Tc = 292 K

Temperature of B, Tc' = 298 K

heat taken out, Qc = 4430 J

Let the heat deposited outside is QH and QH' by A and B respectively.

\(\frac{Q_H}{Q_c}=\frac{T_H}{T_c}\\\\Q_H = \frac{4430\times314}{292}=4763.77 J\)

Now

\(\frac{Q_H'}{Q_c}=\frac{T_H}{T_c'}\\\\Q_H' = \frac{4430\times314}{298}=4667.85 J\)

(a) Work done for A

W = QH - QC = 4763.77 - 4430 = 333.77 J

(b) Work done for B

W' = QH' - Qc = 4667.85 - 4430 = 237.85 J

(c) QH = 4763.77 J

(d) QH' = 4667.85 J

Answer:

Relative; curved; gravity.

Explanation:

According to Einstein, space and time are relative and are parts of a whole universe that has four dimensions. Masses in the universe curved space-time, and the resulting shape of space-time cause gravity.

The above theory is known as the General Relativity or General Theory of Relativity and it was published in 1915 by Albert Einstein.

Basically, it states that universe curved space-time is directly proportional to the energy and momentum of matter and radiation that is present. Thus, gravity is the universe curved space-time caused by massive objects.

Answer:

Complete the passage to describe one of the features of Einstein’s general theory of relativity.

According to Einstein, space and time are  

relative

and are parts of a whole universe that has four dimensions. Masses in the universe  

curve

space-time, and the resulting shape of space-time causes  

gravity

correct on Edge2021

Explanation:

About Venerable

Venerable is a privately held company with business operations based in West Chester, Pennsylvania and Des Moines, Iowa. Venerable owns and manages the legacy variable annuity business acquired from Voya Financial, Inc. Created by an investor group led by affiliates of Apollo Global Management, LLC, Crestview Partners, and Reverence Capital Partners, Venerable is an emerging business with well-established, strategic investors, experienced in successfully building and growing insurance businesses with patient, long-term capital.

Explanation:

a variable (often denoted by x ) whose variation does not depend on that of another.

Answer:

ΔV=Vi + Vf

           2

ΔV= 11m/s + 19m/s

                 2

ΔV= 15m/s

Explanation:

The correct statement regarding the double-slit test is a process wherein you possibly can display the wave nature of light.

Via feeding mild of the appropriate wavelength through a couple of slits with separation distances corresponding to the light wavelength, then interference styles will occur with various intensities that reduce as one measure in addition to the slits. If the slit together with the light supply is moved in the direction of the double slits, the brilliant fringes produced are brighter because the depth of the light passing through the double slit is more.

As the wave passes through each slit, it basically splits into two new waves, every spreading out from one of the slits. these two waves then intrude on each other. At some factors, in which a top meets a trough, they will cancel each different out. The smaller the wavelength is to the slits the nearer the fringes could be. were W=wavelength, D=distance from the slit to the display a=distance among the slits and x is the space between the slits. So x=WD/a in order for the wavelength to decrease so does the perimeter spacing.

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The inductance of a coil, if the coil produces an emf of 2.50 V when the current in it changes from -29.0 mA to 33.0 mA in 14.0 ms, is 0.146 H.

Inductance of a coil The amount of electromotive force generated across a conductor when there is a change in the current flowing through it is defined as self-inductance.

The unit of inductance is the Henry (H), with the symbol L. The voltage induced in the coil is determined by the current passing through it, as well as the coil's inductance. Faraday's law of electromagnetic induction establishes a link between the two entities.

The principle of electromagnetic induction is defined by Faraday's law, which states that the emf (electromotive force) produced by a change in magnetic flux linkage with time is proportional to the negative of the rate of change of magnetic flux linkage.

When there is a change in magnetic flux passing through a coil, this law predicts that an electromotive force is generated in it.

The acronym emf stands for electromotive force, and it represents the quantity of energy that drives current flow in a circuit. The unit of emf is the volt (V).

The amount of electromotive force generated across a conductor when there is a change in the current flowing through it is defined as self-inductance.

The unit of inductance is the henry (H), with the symbol L.

The inductance of a coil is given by the formula: L = E/(di/dt)

Where L is the inductance of a coil E is the voltage induced in the coil di/dt is the rate of change of current passing through the coil.

Thus, the inductance of a coil, if the coil produces an emf of 2.50 V when the current in it changes from -29.0 mA to 33.0 mA in 14.0 ms, is 0.146 H.

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Classical electromagnetism does not predict a specific relationship between the voltage, v0, and the intensity or frequency of incident light.

However, certain experimental observations led to the development of the photoelectric effect, which is described by quantum mechanics.

The photoelectric effect refers to the emission of electrons from a material when it is exposed to light. The observed relationship between the voltage, v0, and the frequency, f, of the incident light is explained by the photoelectric effect. According to this effect, the energy of a photon is directly proportional to its frequency:

E = hf

wherezE is the energy of the photon, h is the Planck constant, and f is the frequency of the light.

When photons interact with a material in the photoelectric effect, they transfer their energy to the electrons in the material. If the energy of a single photon, hf, is greater than the work function of the material, W, which represents the energy required to remove an electron from the material, an electron can be ejected.

The maximum kinetic energy of the emitted electrons, KEmax, can be determined by the difference between the energy of the incident photons and the work function:

KEmax = hf - W

This kinetic energy is related to the voltage, v0, by the equation:

KEmax = e * v0

where e is the elementary charge.

From these equations, it can be seen that the voltage, v0, is proportional to the frequency, f, of the incident light. As the frequency increases, the energy of the photons increases, which in turn leads to an increase in the maximum kinetic energy of the emitted electrons and therefore an increase in the voltage, v0.

It is worth noting that classical electromagnetism alone cannot fully explain the photoelectric effect and the observed relationship between v0 and f. Quantum mechanics provides a more comprehensive framework to understand and explain these phenomena.

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When a honeybee flies through the air, it acquires a charge of +20 pC. Part A: It loses 4 electrons in the process.

#21

According to first equation of kinematics

#22

#a

The order is

#b

for speed find absolute velocity

So order is

S1<S3<S2

Answer:

See below ~

Explanation:

Question 21 :

⇒ v = u + at

⇒ v = 5 + 1.3 (2)

⇒ v = 5 + 2.6

⇒ v = 7.6 m/s

=============================================================

Question 22 : At t = 3

Subpart (a)

⇒ Object 1 : v = 2 + 3(3) = 11 m/s

⇒ Object 2 : v = -8 - 4(3) = -20 m/s

⇒ Object 3 : v = 1 - 5(3) = -14 m/s

⇒ Hence, their velocities are in the order : Object 2 < Object 3 < Object 1

Subpart (b)

⇒ Object 1 : v = | 2 + 3(3) | = 11 m/s

⇒ Object 2 : v = | -8 - 4(3) | = 20 m/s

⇒ Object 3 : v = | 1 - 5(3) | = 14 m/s

⇒ Hence, their speeds are in the order : Object 1 < Object 3 < Object 2

The amοunt οf kinetic energy that is translatiοnal is apprοximately 172.8 J, and the amοunt that is rοtatiοnal is apprοximately 8.733 J.

Tο determine the amοunt οf kinetic energy that is translatiοnal and rοtatiοnal, we need tο calculate the respective cοntributiοns.

The translatiοnal kinetic energy (\(\rm K_{trans\)) οf a rοlling sphere is given by the equatiοn:

\(\rm K_{trans\) = (1/2) * m * v²

where m is the mass οf the ball and v is the linear speed.

Given:

Mass οf the baseball (m) = 0.15 kg

Linear speed (v) = 48 m/s

Substituting the values intο the equatiοn, we can calculate the translatiοnal kinetic energy:

\(\rm K_{trans\)  = (1/2) * 0.15 kg * (48 m/s)²

= 0.15 kg * 1152 m²/s²

= 172.8 J

The rοtatiοnal kinetic energy (\(\rm K_{rot\)) οf a rοlling sphere is given by the equatiοn:

\(\rm K_{rot\) = (1/2) * I * ω²

where I is the mοment οf inertia οf the sphere and ω is the angular speed.

Fοr a sοlid sphere, the mοment οf inertia is given by:

I = (2/5) * m * r²

where r is the radius οf the ball.

Given:

Radius (r) = 3.7 cm = 0.037 m

Angular speed (ω) = 42 rad/s

Substituting the values intο the equatiοn, we can calculate the rοtatiοnal kinetic energy:

I = (2/5) * 0.15 kg * (0.037 m)²

= 0.00277 kg * m²

K_rοt = (1/2) * 0.00277 kg * m² * (42 rad/s)²

= 0.00277 kg * m² * 1764 rad²/s²

= 8.733 J

Therefοre, the amοunt οf kinetic energy that is translatiοnal is apprοximately 172.8 J, and the amοunt that is rοtatiοnal is apprοximately 8.733 J.

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A ball held over a person's head | a ball rolling on the floor is an example of an object that has potential energy followed by an object that has kinetic energy.

This is the type of energy possessed by a body by virtue of its motion or movement.

The rolling ball therefore has kinetic energy while a ball being held over a person's head has potential energy which is the energy possessed by a body by virtue of its position.

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The entire lighted side of the moon is visible during the Full Moon phase. The other phases of the moon are the New Moon, the Waning Gibbous, and the First Quarter.

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