You're sitting on a warm granite rock, enjoying the sunshine. You decide it's time to test the water. You take off your shoes and walk across the cool sand to the water. You wade into the water, enough to cover your feet. Brrr! The water is cold. You will have to wear a dry suit when you go diving.
a. Which item - the granite rock, the sand, or the water - has the highest specific heat? Which has the lowest specific heat?
b. Which item requires the least energy to increase its temperature? Explain your answer in terms of this item's specific heat.
c. If the granite rock on which you were sitting has a specific heat of 600 J/(kg°C), how much energy must be added to a 2-kilogram piece of it to increase its temperature from 20°C to 30°C? Show your work, including the equation you need to perform this calculation.
d. What is the second law of thermodynamics? Use this law to describe why your feet got cold, not hot, when you put them in the water.

we get the distance traveled by the proton as,distance traveled = vt = vp(t)distance traveled = (vp(2d/vp)) = (2d(vp/√(2qVp/m)))Thus, by the time the electron strikes the positive plate, the proton would have traveled 1.13 cm.

Given that the plate separation of a charged capacitor is 0.8 m. A proton and an electron are released from rest at the midpoint between the plates.The acceleration experienced by each particle is given as, a = F/mwhere m is the mass of the particle and F is the force experienced by the particle. The force experienced by each particle is given as F = qEwhere q is the charge of the particle and E is the electric field experienced by the particle.The electric field between the plates of the capacitor is given by

E = V/d, where V is the potential difference across the plates and d is the distance between the plates.The potential difference across the plates is given as V = Ed = (Vf - Vi)

where Vf is the final potential of the positive plate, Vi is the initial potential of the negative plate.Substituting the value of electric field,

we get V = Ed = (Vf - Vi)By the law of conservation of energy, the kinetic energy gained by the electron is equal to the potential energy lost by the capacitor.

Kinetic energy gained by electron = 1/2 mv² = qVqV = 1/2 mv²The potential energy lost by the capacitor = 1/2 CV² = qVqV = 1/2 CV²qV = 1/2 mv² ⇒ v = √(2qV/m)

By the time the electron strikes the positive plate, the time taken = t = (2d/v)where d is the plate separationSubstituting the values, we get the time taken as,t = (2d/v) = (2 × 0.8)/ √(2qV/m)

Similarly, the time taken by the proton is given by,t = (2d/vp)where vp is the velocity of the protonvp = √(2qVp/m)The distance traveled by the proton by the time the electron strikes the positive plate is given by,

distance traveled = vt = vp(t)

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An internal combustion engine is an engine in which combustion takes place inside the engine and is used to generate mechanical power.

Step 1: Intake: During the intake stroke, the engine takes in air (if it is naturally aspirated) or a mixture of air and fuel (if it is fuel-injected) and compresses it. In the combustion chamber, this mixture is drawn in through the intake valve. The carburetor mixes the fuel and air, while the fuel injectors inject fuel directly into the combustion chamber.

Step 2: Compression: During the compression stroke, the piston moves back up to compress the mixture of air and fuel. The spark plug fires, igniting the compressed mixture of air and fuel, and generating a tremendous amount of heat.

Step 3: Combustion: When the spark plug ignites the fuel-air mixture, the mixture ignites and burns, causing a rapid expansion of the hot gases and the expulsion of the piston. This energy is used to generate power by pushing the piston down, which turns the crankshaft. This energy is then transmitted to the wheels via the transmission.

Step 4: Exhaust:During the exhaust stroke, the exhaust valve opens, and the piston moves up to push the hot gases out of the combustion chamber. The exhaust system then takes the hot gases away from the engine and discharges them into the atmosphere.

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When a beam of electrons is directed at a narrow pair of slits, an interference pattern is observed at a screen behind the double slit. This is due to the wave-like nature of electrons, where they can interfere with each other as they pass through the slits.

The interference pattern consists of alternating bright and dark fringes, with the bright fringes corresponding to constructive interference and the dark fringes corresponding to destructive interference.  This phenomenon is known as the double-slit experiment and demonstrates the wave-particle duality of electrons.

The spacing between the fringes depends on the distance between the slits and the screen, as well as the wavelength of the electrons. This phenomenon is known as electron diffraction and is a fundamental aspect of quantum mechanics.

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Answer:

The correct false statement is;

As the stone rises, its potential energy decreases

Explanation:

When the stone is thrown straight up into the air, the initial velocity, u, progressively decreases according to the following equation;

v = u - g·t

Where;

v = The final velocity

g = The acceleration due to gravity = 9.81 m/s²

t = The time taken

Therefore whereby, the kinetic energy. K.E. is given by the equation , K.E. = 1/2 × m × u², as u reduces, the kinetic energy reduces

However, the potential energy, P.E. is given as P.E. = m × g × h

Where;

h = Height

m = The mass of the stone

Therefore, as the stone rises, the potential energy increases.

Answer:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Explanation:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Answer:

You can describe the motion of an object by saying it is moving in a straight line or is curved around another object. You can also describe where an object is by its position in relation to another object. The second object acts as a reference point. When an object changes position, you know it has motion. Motion can also be described by finding an object's speed  or how fast or slow it moves in a certain amount of time. In addition, you can describe the object's speed AND direction together. This is called velocity

Explanation:

In the given answer-

Motion is defined as - the change in the movement or position of any object  or body.

Position is said to be a place or somewhere or a location where any object or body is particularly placed/located or put on.

Reference point is a fixed point with regards to which any object or body changes its position. It is also called reference origin.

Speed is defined as the rate of any object covering certain distances. It is a scaler quantity (quantity which depends upon only magnitude).

Velocity is defined as the rate of speed per unit time. It is a vector quantity (quantity depending upon both magnitude and direction ).

We can describe the motion of an object by saying it is moving in a straight

line or is curved around another object.

We can describe where an object is by its position in relation to another

object.

The second object acts as a reference point.  Motion can also be described

by finding an object's speed or how fast or slow it moves in a certain amount

of time . We can describe the object's speed and direction together which is

called velocity

Motion describes the movement of an an object by virtue of its change in

movement and position.

Position is defined as an area or location where a body is in relation to

another object.

Reference point is also referred to as origin. It is fixed and acts as a

reference point to other objects location.

Speed is defined as the rate at which a body moves at a particular place/location.

Velocity is defined as the rate of speed per unit time which speed/time.

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The average weight percent of silica in intermediate magma is approximately 55% to 65%. Intermediate magma is a term used to describe magmatic rocks that have a silica content between those of mafic and felsic magmas.

Mafic magmas typically contain around 45% to 55% silica, while felsic magmas have a higher concentration, around 65% to 75%.
Intermediate magmas are responsible for forming various types of igneous rocks such as andesite and diorite. These rocks can be found at volcanic arcs and convergent plate boundaries, where oceanic and continental plates collide. The silica content in magma plays a crucial role in determining its viscosity, temperature, and overall behavior.
Magma with a higher concentration of silica tends to be more viscous, which means it flows less easily and may result in explosive volcanic eruptions. Intermediate magmas, with their silica content in the middle range, can exhibit a mix of behaviours, often depending on other factors such as temperature and gas content. Understanding the silica content of different magma types is essential for geologists and volcanologists when studying volcanic activity, rock formation, and the composition of Earth's crust.

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Answer:

The change in time for the first quarter is  seconds.  = 2.07

The change in time for the second quarter is  seconds.

=1.09

The change in time for the third quarter is  seconds.

=0.95

The change in time for the fourth quarter is  seconds.=0.81

Explanation:

Hope this helped.

The statement suggests that there are 24 specific objects that transmit complex radio codes, including time signals traveling at the speed of light. It also states that you can contact at least 4 of these objects at any time of day or night.

Based on this information, it seems like the objects being referred to are satellites. Satellites are objects that orbit the Earth and can transmit signals for various purposes, including time synchronization.

One example of such satellites is the Global Positioning System (GPS) satellites.

The GPS system consists of a network of satellites that transmit signals to GPS receivers on Earth, enabling us to determine our precise location and time.

In conclusion, the main answer to the question is that the 24 specific objects mentioned are likely satellites, such as GPS satellites, that transmit complex radio codes, including time signals. You can contact at least 4 of these objects at any time of day or night.

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As long as the applied stress is removed, a material that is linearly elastic experiences stress and strain that are directly proportional within the elastic limit.

In a material that is linearly elastic, the Young's modulus (E), stress, and strain are all related by the equation you supplied, E =. Here is a quick definition of each phrase:

(E) Young's modulus It is a way to gauge how hard or stiff a material is. Within the elastic limit of the material, it indicates the stress to strain ratio. The stiffer the material, the higher the Young's modulus.

Stress (): The force exerted to a material's surface area is called stress. The internal resistance of a material to deformation under an applied force is measured by stress.

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Answer:

1. t = 4.24 s

2. \(v_{f} = 42.43 m/s \)

Explanation:

Podemos encontrar el tiempo de caída con la siguiente ecuación:

\( v_{f} = v_{0} + gt \)   (1)

En donde:

\( v_{f}\): es la velocidad final de la pelota  

\( v_{0}\): es la velocidad inicial = 0 (se deja caer)

g: es la aceleración debida a la gravedad = 10 m/s²

Debemos hallar primero la velocidad final. Podemos usar la ecuación:

\( v_{f}^{2} = v_{0}^{2} + 2gh \)  (2)

En donde:

h: es la altura = 90 m

\( v_{f} = \sqrt{2gh} = \sqrt{2*10 m/s^{2}*90 m} = 42.43 m/s \)

Entonces, la velocidad con la que la pelota llega al suelo es 42.43 m/s.

Ahora podemos encontar el tiempo que tarda en caer la pelota resolviendo la ecuación (1) para "t":

\( t = \frac{v_{f}}{g} = \frac{42.43 m/s}{10 m/s^{2}} = 4.24 s \)

Por lo tanto, la pelota tarda 4.24 segundos en caer.

Espero que te sea de utilidad!

Given data

*The given mass of the car is m = 1610 kg

*The given effective force constant is k = 5.75 × 10^4 N/m

(a)

The formula for the period of oscillation of a 1610 kg car is given as

Substitute the known values in the above expression as

Hence, the time period of oscillation of a 1610 kg car is T = 1.05 s

(b)

As from the given data, the amplitude of the oscillation of the car decreases by a factor of 5.00. Then, the expression for the amplitude of the oscillation, and the damping constant (b) is calculated as

Substitute the known values in the above expression as

Hence, the damping constant is b = 9871.2 kg/s

The team of engineers must first define the problem, Option A.

The term air quality has to do with the overall purity of the air in a certain locality. We know that the air in an area is affected by the activities of the people that reside in that vicinity.

In this case, the team of engineers must first define the problem before they can  improve local air quality in the community.

Missing parts;

A team of engineers is asked to help a community improve local air quality. What must the team do before it can begin to identify possible solutions?

answer choices

Iterate to improve the solution.

Define the problem.

Select one solution.

Model the solution.

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Approximately 962,920,000 joules in a candy bar containing 230,000 calories.

It is important to understand that joules and calories are both units of energy measurement. However, joules are the SI unit of energy, while calories are commonly used in nutrition. One calorie is equivalent to 4.184 joules.
To convert calories to joules, we can multiply the calorie value by 4.184.
Multiply the given calories by the conversion factor
In this case, 230,000 calories multiplied by 4.184 gives us 962,920,000 joules.

In summary, a candy bar containing 230,000 calories has approximately 962,920,000 joules of energy.

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Answer:

38500

Explanation:

I looked it up so it may be wrong

Answer:

μ=1/5=0.2

Explanation:

using the formula

Fs=Fn*μ

Where

Fs is the static force

Fn = Normal force

μ= coefficient

so if Fn=25n

and it requires 5 n to start moving, means the max Fs is 5n

5=25μ

μ=5/25

μ=1/5=0.2

Answer:

a counterclaim

Explanation:

authors purpose is what an author wrote somthing for

opinion is someones thoughts or "side" on a argument

an arguement is a battle of opinions if that makes sense

The distance d travelled by in object is 68.58 m

What is velocity ?

velocity is defined as rate of change of displacement d of the object with respect to rate of change in time t. In mathematics It is written as :

v = d/t

it should be noted that, velocity is nothing but speed in particular direction. That is velocity is vector quality having both magnitude and direction where as speed is just the magnitude of velocity.

1 feet = 0.3048 m

15 feet = 4.572 m

Now, calculating the distance d travelled by in object :

d = vt

d = 4.572 x 27

d = 68.58 m

Therefore, the distance d travelled by in object is 68.58 m

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The answer response are:

a. plastic wrap - transparent

b. wax paper - translucent

c. wedding veil - sheer/transparent

d. thick rug - opaque

e. textbook - opaque

f. window - transparent

a. Plastic wrap is a thin, clear material that allows light to pass through it, making it possible to see objects behind it. Therefore it's transparent.

b. Wax paper is a thin, translucent material that allows some light to pass through it, making it possible to see through it, but not clearly as in the case of transparent materials. The objects behind it can be seen but appear somewhat cloudy or blurry.

Hence c. A wedding veil is a thin, sheer material that is often made of tulle or other lightweight fabrics. This makes it transparent, allowing light to pass through it easily and making it possible to see objects behind it.

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The mass of the object is approximately 2.04 kg.

To find the mass of the object, you can use Hooke's Law, which states that the force exerted by a spring is proportional to its displacement (F = kx). In this case, the spring constant (k) is 40 N/m and the displacement (x) is 0.5 m.
1. Calculate the force exerted by the spring:

F = kx

= 40 N/m × 0.5 m

= 20 N
2. Since the force exerted by the spring is equal to the gravitational force acting on the object (F = mg), you can solve for the mass (m) using the acceleration due to gravity (g), which is approximately 9.81 m/s².
3. Rearrange the formula to solve for mass:

m = F/g

= 20 N / 9.81 m/s²

≈ 2.04 kg
The mass of the object is approximately 2.04 kg.

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Answer:

By pointing one's right thumb along the direction of the current, the direction of the magnetic field can by found by curving one's fingers around the wire. The strength of the magnetic field depends on the current I in the wire and r, the distance from the wire.

Maxwell's equations describe the behavior of electromagnetic waves. In this particular electromagnetic field, we can see that the electric field (E) and magnetic field (B) are perpendicular to each other and both vary sinusoidally with time and distance.

To show that this field satisfies Maxwell's equations, we need to confirm that it satisfies the wave equation.
The wave equation relates the second derivative of the electric field with respect to distance (x) to the second derivative of the electric field with respect to time (t), and similarly for the magnetic field. When we apply the wave equation to this field, we find that w^2 = c^2k^2, where w is the angular frequency and c is the speed of light.

This relationship between w and k is known as the dispersion relation and it ensures that this particular electromagnetic field satisfies Maxwell's equations. In summary, the electromagnetic field given by (9.64) can satisfy Maxwell's equations if the angular frequency (w) and wave number (k) are related through the dispersion relation w^2 = c^2k^2.

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A chemical element with the symbol Be and atomic number 4 is known as beryllium. Beryllium is a solid at room temperature and is categorized as an alkaline earth metal. The molar mass of beryllium (atomic number 4) is 9.012 g/mol. Accordingly, if all 6.22x1023 Beryllium atoms were put together in a mole, they would weigh 9.012g on a triple beam balance.

The atomic mass unit serves as the unit of measurement for mass (amu). A mass unit of an atom is 1.66 x 10-24 gram. The mass of one nucleon, which can be either a single proton or neutron, is roughly equal to one unified atomic mass unit, which is numerically equivalent to 1 g/mol.

In the aircraft industry in particular, beryllium is employed in gears and cogs. A silvery-white metal is beryllium. It has a low density and is relatively soft. Gyroscopes, springs, electrical contacts, spot-welding electrodes, and non-sparking tools all use beryllium in alloys with copper or nickel.

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Answer:

D : Add more soil

Explanation:

Answer:

The Principle of Moments states that when a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment about the same point. Moment =force F x perpendicular distance from the pivot d.

Answer:

59g

Explanation:

The tennis ball with a velocity of 18 m/s and momentum of 1.06 kg m/s then the mass of the tennis ball in grams will be 59 grams (approx) two significant figures.

Regardless of the frame of reference, momentum is a conserved quantity in any inertial frame, which means that if an enclosed system is not subject to outside influences, its total linear momentum remains constant.

Additionally, momentum is preserved in general relativity, electrodynamics, quantum mechanics, quantum field theory, and special relativity (using a modified formula). It is a manifestation of translational symmetry, one of the basic symmetries of space and time.

According to the question, the given values are :

Velocity, v = 18 m/s

Momentum, p = 1.06 kg m/s

p = m × v

1.06 kg m/s = m × 18 m/s

m = 1.06 / 18

m = 0.0589 kg or

m = 58.9 grams or 59 grams approx in two significant figures.

So, the mass will be 59 grams.

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The expression for the current flowing through the capacitor is i(t) = -0.01exp(-100t), where t is the time in seconds.

The current flowing through a capacitor is given by the derivative of the voltage with respect to time, multiplied by the capacitance:

i(t) = C * d/dt[v(t)]

Substituting the given voltage expression, we get:

i(t) = 1μF * d/dt[100exp(-100t)]

Taking the derivative of the exponential function, we get:

i(t) = 1μF * (-100) * exp(-100t)

Simplifying, we get:

i(t) = -0.01exp(-100t)

Therefore, the expression for the current flowing through the capacitor is i(t) = -0.01exp(-100t), where t is the time in seconds.

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