Name some minerals used as gems.​

A sculptor uses a constant volume of modeling clay to form a cylinder with a large height and a relatively small radius. The clay is molded in such a way that the height of the clay increases as the radius decreases, but it retains its cylindrical shape. At time t=c, the height of the clay is 8 inches, the radius of the clay is 3 inches, and the radius of the clay is decreasing at a rate of 12 inch per minute. The expression for the rate of change of the radius of the clay with respect to the height of the clay in terms of height h and radius r is dr/dh =- r/2h

The following formula determines a cylinder's volume:

V = πr²h,

where V is the volume, r is the cylinder's radius, and h is the cylinder's height.

In terms of height h and radius r, we must express the rate at which the clay's radius changes in relation to its height.

That means that height h and radius r are used to express dr / dh. To accomplish this, we must first compare the volume to the height, or find dV / dh:

V = πr²h

dv/dh = d/dh ( πr²h)

dv/dh =πr²+2 πrh dr/dh

The volume constance dV/dh = 0

dv/dh =πr²+2 πrh dr/dh

0=πr²+2 πrh dr/dh

-πr² =2 πrh dr/dh

dr/dh = - -πr² / 2 πrh

dr/dh =- r/2h

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Follow my lead or ur answer is very wrong

The speed of countershaft drive gear is 225 RPM.  To find it, you have to compare both STM value.

To calculate the the speed of countershaft drive, we use the formula of the surface teeth per minute (STM) where the formula is:

the surface teeth per minute (STM) = Speed x number of teeth

Because of the main drive gear is connected with the countershaft drive gear, the STM of both are equivalent. So.

Main gear speed x Main gear number of teeth = countershaft speed x countershaft  number of speed

35 teeth x 450 RPM = 70 teeth x "x" RPM

450 RPm = 2 x "x" RPM

x = 450 : 2 RPM

x  = 225 RPM

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The energy that an item retains due to its position in relation to other objects, internal tensions, electric charge, or other reasons is known as potential energy in physics.

Although it has connections to the Greek philosopher Aristotle's concept of potentiality, the phrase "potential energy" was coined by the Scottish engineer and physicist William Rankine in the 19th century. Potential energy is connected to forces that affect a body in such a way that their combined work is only dependent on the body's beginning and ultimate positions in space. At any point in space, these forces, also known as conservative forces, can be represented by vectors that are gradients of a particular scalar function known as potential.

The block has potential energy due to its position above the ground. The formula for potential energy is PE = mgh, where m is the mass of the object (7.9 kg), g is the acceleration due to gravity (approximately 9.8 m/s^2), and h is the height above the ground (20 m).

So the potential energy of the cinder block is:

PE = (7.9 kg) x (9.8 m/s^2) x (20 m) = 1564 Joules

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The space station's mass and the pull of its gravitational field on the planet(D)

Astronaut is a term for a person who has travelled to space that is derived from the Greek words for "star" and "sailor." More specifically, space travellers from the United States, Canada, Europe, and Japan are referred to as "astronauts" in the West. An astronaut is a person who has received specialised training in order to travel to space. A spaceship's astronauts may do a variety of tasks. Typically, a commander and a pilot collaborate to lead the mission. Other positions could be science pilot, mission expert, payload commander, and flight engineer.

The astronaut does highly significant scientific research on Earth to advance technological advancement in addition to gathering samples, performing tests, and making minor repairs on spaceships and space stations. The study of space and even all the efforts made to escape the gravity of Earth have led to the production of items that we use every day as well as scientific theories that have altered our perceptions of space and our understanding of the origins of life on Earth.

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One minute has 60 seconds, One hour has 60 minutes and one day has 24 hours. Thus, 80 x 60 x 24 = 86,400 seconds in a day.

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Angular momentum and linear momentum are two physical concepts that have some similarities and differences. They are both measures of motion, but they describe different types of motion.

Similarities:

Differences:

The term angular momentum and linear momentum are similar in that they are both conserved and vector quantities, but they differ in that angular momentum describes rotational motion and linear momentum describes translational motion.

In summary, angular momentum depends on both mass and distance from the axis of rotation, while linear momentum depends only on mass and velocity.

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Part other than hydrogen that acid contain- is called anion in dissolved form.

A Bronsted-Lowry acid or Lewis acid is a molecule or ion that can either donate a proton (the hydrogen ion, H⁺) or establish a covalent bond with an electron pair.

The proton donors, also known as Bronsted-Lowry acids, are the first class of acids. Proton donors, also referred to as Arrhenius acids, generate the hydronium ion H₃O⁺ under the unique situation of aqueous solutions. The Arrhenius theory was expanded upon by Bronsted and Lowry to take non-aqueous solvents into account.

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The force of an electron cannot be calculated directly. However, the force of an electron can be determined indirectly by measuring the electric field around the electron and calculating the force on the electron using the equation F=qE, where q is the charge of the electron and E is the electric field.

The electric field around an electron can be measured using various experimental methods. One of the most common methods is to use a laser to measure the electric field of an electron. This is done by shining a laser beam onto a charged particle and then measuring the intensity of light that is scattered from the particle.

The electric field of the electron can then be calculated from the measured intensity of the scattered light.

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Minimum 14 times in a year is the time in which a full moon is observed from earth’s surface.

The Moon is not like Earth. It does not have oceans, lakes, rivers, or streams. It does not have wind-blown ice fields at its poles. Roses and morning glories do not sprout from its charcoal gray, dusty surface. Redwoods do not tower above its cratered ground.

Dinosaur foot prints cannot be found. Paramecium never conjugated, amoeba never split, and dogs never barked. The wind never blew. People never lived there—but they have wondered about it for centuries, and a few lucky ones have even visited it.

The lunar surface is charcoal gray and sandy, with a sizable supply of fine sediment. Meteorite impacts over billions of years have ground up the formerly fresh surfaces into powder. Because the Moon has virtually no atmosphere.

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Wave B will be louder than wave A.

Let the amplitude of wave A be a1 and the amplitude of wave B be a2.

Similarly, let the loudness of wave A be L1 and the loudness of wave B be L2.

We know,

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{a1^{2} }{a2^{2} }[/tex]

By substitution we see:

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{3^{2} }{4^{2} }[/tex]

We get:

[tex]\frac{L1}{L2}[/tex] = [tex]\frac{9}{16}[/tex] .

Thus we see that the loudness of wave A is 9Hz while that of wave B is 16Hz. So we conclude that wave B is louder than wave A.

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The potential energy associated with the conservative force is +40 j. As the particle moves from a to b, the force does +25 j of work on the particle, all of which results in an increase in the kinetic energy only. Hence, the value of the potential energy at point b is -25J.

Given:

Mass of the particle= 0. 40 kg

Speed=10m/s

Initial workdone =+25J

Initial Potential enrgy=+40J

Now to find the value of the potential energy at point b use the following statement i.e.

∴ The change in potential energy of the given system is the -ve of the internal work done by the conservative force on the particle.

Hence,

ΔU=−W int

ΔU=-(+25J)

ΔU=-25J

Hence, -25Jis the value of the potential energy at point b.

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The force of gravity which is the same as weight of the object is 11.8 N

Weight can be defined as a gravitational pull on any object in space under the influence of acceleration due to gravity. The force of gravity acting on an object is also known as weight.

To find the force of gravity acting on the 1.2 Kg rabbit, let us use the formula below

W = mg

Where

Substitute all the parameters

W = 1.2 × 9.8

W = 11.76 N

Therefore, the force of gravity acting on the 1.2 kg rabbit is 11.8 N approximately.

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The surface tension of the liquid is 24.1 g/m.

To determine the surface tension of the liquid, employ the formula:

surface tension = (extra force required) / (length of the film)

extra force required = 3.03 g

internal radius = 3 cm = 0.03 m

external radius = 3.2 cm = 0.032 m

The length of the film can be calculated as the circumference of the external ring minus the circumference of the internal ring:

length of the film = (2 * pi * external radius) - (2 * pi * internal radius)

= (2 * pi * 0.032 m) - (2 * pi * 0.03 m)

= 0.1257 m

Hence, the surface tension can be determined following our chosing formula:

surface tension = (3.03 g) / (0.1257 m)

= 24.1 g/m

It can then be concluded that the surface tension of the liquid is 24.1 g/m.

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When riding down a hill, the two types of energy which a moving bike has are kinetic energy and thermal energy.

Kinetic energy is the energy of motion, observable as the movement of an object or subatomic particle. Every moving object and particle have kinetic energy. Example of kinetic energy, such as: a race car speeding around the corner, a bicycle crushing down the hill, and students running home from the school.

Thermal energy refers to the energy contained within a system which is responsible for its temperature. Heat is the flow of thermal energy. An example of thermal energy is boiling water on the stove.

So, when riding down a hill, a bike has kinetic energy, and when brakes apply, the energy into thermal energy on the brake (heat).

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Answer:

0.00088 kg/m³

Explanation:

Given:

[tex] \displaystyle{ \dfrac{8.8 \times {10}^{ - 3} \: \text{g} }{ \text{cm}^{3} }}[/tex]

Let's consider cm³ to m³ first. We know that m³ is 100 cm³. Therefore, cm³ would equal to m³ × 10 negative squared:

[tex] \displaystyle{ \dfrac{8.8 \times {10}^{ - 3} \: \text{g} }{ {10}^{ - 2} \: \text{m}^{3} }}[/tex]

And from the numerator, 1 kg = 10³ grams. Therefore, 1 gram would equal 10 to negative cube kg Hence:

[tex] \displaystyle{ \dfrac{8.8 \times {10}^{ - 3} \times {10}^{ - 3} \: \text{kg} }{ {10}^{ - 2} \: \text{m}^{3} }}[/tex]

Then evaluate using law of exponent where if same bases multiply each other, we add the exponents:

[tex] \displaystyle{ \dfrac{8.8 \times {10}^{ - 3 - 3} \: \text{kg} }{ {10}^{ - 2} \: \text{m}^{3} }} \\ \\ \displaystyle{ \dfrac{8.8 \times {10}^{ - 6} \: \text{kg} }{ {10}^{ - 2} \: \text{m}^{3} }} \\ \\ \displaystyle{ \dfrac{8.8 \times {10}^{ - 6 + 2} \: \text{kg} }{ \: \text{m}^{3} }} \\ \\ \displaystyle{ \dfrac{8.8 \times {10}^{ - 4} \: \text{kg} }{ \: \text{m}^{3} }}[/tex]

And 8.8 × 10^-4 is equal to 0.00088. Therefore, the answer is 0.00088 kg/m³

Answer:

16 m

Explanation:

(4 m/s)(t + 2 s) = (8 m/s)t

4t + 8 = 8t

8 = 4t

t = 8/4 = 2 sec

This means that after Car A has traveled for 4 sec, Car B catches up to it after it has traveled 2 s (having left 2 s after Car A).

Where do they meet up:

d = rt

Car B:  d = (8 m/s)(2 s) = 16 m

Car A:  d = (4 m/s)( 2 s + 2 s) = 16 m   **always check both equations to make sure your answer is correct

Out of the given options, Natural gas is a non-renewable source of energy.

Energy sources are categorized into two types, renewable and non-renewable source of energy. renewable sources of energy are those which can be use more than once. like: wind energy, solar energy, and tidal energy, etc. On the other hand non-renewable energy cannot be used more than once. they got vanished after one use. They are one-time use energy sources. Some examples of non-renewable sources of energy are, natural gas, petrol, diesel, coal, etc.

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Answer:

The substance would of been frozen

Explanation:

A substance did not change its chemical nature in a reaction. Which most likely describes the reaction? It was frozen.

The distance between the director and the drum is 132 m.

Sound is a vibrate that move through a medium that can be solid, liquid or gas in the form of mechanical wave. In short, sound is an energy made by vibration. the intensity of the sound is decrease by the length of the travel it pass or we can say, the far the sound source from the listener, the minor the sound they can hear. The formula of the sound in correlation with time of hear and distance is time of hear = speed of sound : distance. As per data given, time of hear = 0.40s; speed of sound = 330 m/s. The distance will be:

time of hear = speed of sound : distance

0.40 = 330 : distance

distance = 330 : 0.40

distance = 132 m

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According to the problem The barbell's mass is 178 kg.

What is barbell's mass ?

The mass of a barbell can vary depending on the size and type of barbell. Standard barbells typically range from 10 kilograms (22 pounds) to 45 kilograms (99 pounds). Olympic barbells are typically 25 millimeters (1 inch) in diameter and are available in weights ranging from 15 kilograms (33 pounds) to 25 kilograms (55 pounds). Barbells with a smaller diameter, such as a women's barbell, usually weigh between 5 kilograms (11 pounds) and 15 kilograms (33 pounds). Powerlifting barbells are thicker and longer than standard barbells and usually weigh between 20 kilograms (44 pounds) and 25 kilograms (55 pounds).

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Answer:

W =  - 16450 J  

Explanation:

Force of friction = - 329 N ( Friction acts opposite to the direction of motion )

Displacement = 50 m

W = F s

   =  - 329 × 50

W =  - 16450 J

∴ The work done by the force of the friction is - 16450 J .

The work done on the car to stop it by the frictional force of 329 N over 50 m is 16450 J.

Friction is a type of force which resists the motion of an object. Thus friction opposes the force that make the object moving. When a force is making a displacement on object or make it stop.

The work done in physics is the product of the force acting on it to stop or displace and the displacement.

Given  displacement = 50 m

friction  force = 329 N

Work done =  Force ×  displacement

                   = 329 N × 50 m = 16450 J

Therefore, the work done on the car by the frictional force to stop it is 16450 J.

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Answer:

it is refracted

Explanation:

After the collision, the final velocity of both balls will be (2.00 + 3.60) m/s in the same direction.

The outcome of the two things applying force to one another. The kinetic energy of the two objects is transformed into the other forms, such heat or sound, when they contact. Both elastic and inelastic collisions exist. Both the colliding objects maintain their original energy in an elastic collision.

The first ball has kinetic energy of (1/2)mv² where m is the mass of the ball and v is the velocity. The second ball has kinetic energy of (1/2)m(3.60)²

After collision, the final velocity of both balls in the same direction can be calculated using the conservation of momentum.

m1v1 + m2v2 = m1v'1 + m2v'2

where m1,m2 are the mass of the balls, v1 and v2 are the initial velocities of the two balls and v'1 and v'2 are the final velocities of the two balls.

Given that the mass of the two balls is equal, you can simplify this equation as:

v1 + (-v2) = v'1 + v'2

and solving for v'1 and v'2 gives v'1 = (v1+v2) and v'2 = (v1+v2)

Therefore, after the collision, the final velocity of both balls will be (2.00 + 3.60) m/s in the same direction.

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The mass of the object with a kinetic energy of 16,000 joules has a velocity of 8 m/s is 500kg.

Kinetic energy refers to the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.

Kinetic energy of a body can be calculated using the following formula:

K.E = ½mv²

Where;

According to this question, an object with a kinetic energy of 16,000 joules has a velocity of 8 m/s. The mass can be calculated as follows:

16,000 = ½ × m × 8²

16,000 = 32m

m = 16000/32

m = 500kg

Therefore, 500kg is the mass of the object.

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A higher pitch siren is audible to this person. The sound waves become less frequent as they get more spaced apart as the police car moves off.

The distance between identical points (adjacent crests) in adjacent cycles determines how far a waveform signal has traveled in space or over a wire. In wireless systems, this length is frequently specified in meters (m), centimeters (cm), or millimeters (mm) (mm).

The wavelength, which is also the distance between two wave crests and troughs, is the measurement of wave length. In cycles per second (Hz), the term "frequency" refers to the number of vibrations that cross a specific area in a second (Hertz).

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Answer:

As electrons move from higher energy levels to lower energy levels a photon (particle of light) will be given off. This is the process of emission.

Explanation:

electrons and photons also do this

According to the question, the velocity of ball 2 after the collision is 30 m/s.

What is velocity?
Velocity is a vector quantity that describes the rate and direction of an object's motion. It is the displacement of an object over a period of time and is usually expressed in terms of distance (meters, feet, or kilometers) divided by time (seconds). It can also be expressed as the speed of an object in a particular direction. Velocity is a key factor in describing the motion of objects, as it accounts for both the speed and direction of an object's motion. It is an important concept in physics, and it is used to calculate forces and potential energy.

From the laws of conservation of momentum, the final velocity of ball 2 can be calculated as follows:

m1u + m2v = m1v1 + m2v2

0.2 x u + 0.2 x v = 0.2 x u + 0.2 x v2

v2 = u - (6N x 0.1s)/0.2kg

v2 = u - 30 m/s

Therefore, the velocity of ball 2 after the collision is 30 m/s.

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Answer:

Which of the following is NOT TRUE about a longitudinal wave?

Explanation: