HELP PLEASE
Select ALL of the correct answers. Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the balls journey will gravity be the greatest force acting on ball?

White lights can sometimes be found on red buoys.

Hence, Option C is correct answer.

Thus from the above conclusion we can say that White lights can sometimes be found on red buoys.

Hence, Option C is correct answer.

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Answer:

2.15ml

Explanation:

The formula for density is    D = m/v

Since we already have density and mass, we need to rearrange the equation to find the volume.

The rearranged formula is     V = m/D

V = 28g/13g/ml

The volume is 2.15ml

With the application of third equation of motion, the car go as far as 451.3 meters before coming to a stop

Braking Force is the force applied for an object to decelerate or stop. It is also the product of mass and its deceleration.

Given that a car with a mass of 1260 kg is travelling at 38.0 m/s when the driver sees a traffic jam ahead. If the average braking force in modern vehicles is 2010 N,

The given parameters are;

Before we know how far will the car go before coming to a stop, we need to know its deceleration.

F = ma

2010 = 1260a

a = 2010/1260

a = 1.6 m/s²

Now, let us applied third equation of motion

v² = u² - 2as

v = 0 since the car is coming to rest.

0 = 38² - 2 × 1.6 × s

0 = 1444 - 3.2s

3.2s = 1444

s = 1444/3.2

s = 451.25 m

Therefore, the car go as far as 451.3 meters before coming to a stop.

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Answer:

B. The dentist uses X-ray radiography, which takes too short a time to cause those problems.

Explanation:

The statement B would best inform Sally of the level of risk. The dentist uses X-ray radiography, which takes too short a time to cause those problems and risk.

X-ray imaging provides images of human internal organs. The photos depict your body parts in various colors of black and white.

Because various tissues absorb varying quantities of radiation, this is the case. Because calcium absorbs the most x-rays, bones appear white.

When X-ray radiation passes into our bodies, it damages molecular structures and may cause injury.

Human cells are damaged by extremely high doses of radiation, as indicated by skin burns, hair loss, and an increased risk of cancer.

Sally is concerned about the X-ray images her dentist plans to take of her teeth. She has read that X-rays can cause tissue effects, such as skin reddening and hair loss.

The statement B would best inform Sally about the level of risk. The dentist uses X-ray radiography, which takes too short a time to cause those problems and risk.

Hence, statement B would best inform Sally about the level of risk.

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The best way to calculate the volume of a log with a serious defect is to calculate the volume of the defect and subtract it from the total volume of the log which is denoted as option C.

This is referred to as the amount of space occupied by any three-dimensional solid which could be a square, rectangle etc.

In a scenario where a defect is present in the log, then it is  best to consider it by first calculating the volume of the defect after which it is then subtracted from the total volume of the log in other to give an accurate result.

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The thicker wire has one-fourth the resistance of the thinner wire.

The characteristic of a substance that prevents the flow of current is known as resistance. The free electrons begin to move in a specific direction when a voltage is applied across the conductor. These electrons collide with atoms or molecules as they move, creating heat in the process. These atoms or molecules prevent free electrons from moving through a substance. Resistance is represented by the symbol R.

Specific resistance is another name for resistivity. A substance with certain dimensions, such as one meter in length and a cross-sectional area of one square meter, has a resistance that is represented by its resistivity. Resistivity or specific resistance is represented by ρ.

The relation between resistance R and resistivity ρ is given as:

                                              R = ρL/A

where,

R = resistance of the conductor

ρ =  resistivity of the material

L = length of the conductor

A = cross-sectional area of the conductor

Given,

r₁ = 2r₂

L₁ = L₂

where

r₁ = radius of the first conductor

r₂ = radius of the second conductor

L₁ = length of the first conductor

L₂ = length of the second conductor

To find

R₁/R₂ =?  (the ratio of R₁ and R₂)

If the radius is twice the other then the area will become,

A₁ = π r₁²

A₂ = π r₂²

A₁ = π (2r₂)²

   = 4π r₂²

Therefore,

A₁ = 4 A₂

Now put the values in the formula,

R = ρL/A

R₁/R₂ = ρ L₁ A₂/  ρ L₂ A₁

R₁/R₂ = L A₂/ L (4A₂)

R₁/R₂ = 1/4

R₁ = R₂/4

Hence, the thicker wire with twice the radius of the thin wire has one-fourth the resistance of the thinner wire.

I understand the question you are looking for is this:

How do the resistances of two conducting wires compare if they have the same length, but one is twice the radius of the other?

(a) The thicker wire has half the resistance of the thinner wire

(b) The resistance is the same in both wires

(c) The thicker wire has one-fourth the resistance of the thinner wire

(d) The thicker wire has twice the resistance of the thinner wire.

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If a red blood cell is 7 x \(10^-^6\) m in size, it means that such a cell is 7 microns or micrometer in size. The unit that completes the sentence will, thus, be microns or micrometer.

According to international system of measurement:

Thus, a measurement of 7 x \(10^-^6\) m is the same is 7 micons or 7 micrometer.

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The measurements of sizes of eclipsing binaries depend on data such as light curves, radial velocity curves, and inclination of the orbital plane.

Eclipsing binaries are a type of binary star system in which two stars orbit around each other and periodically pass in front of each other, causing periodic variations in the system's brightness as seen from Earth. These variations are known as light curves and can be used to measure the sizes of the stars.

The analysis of the light curve involves measuring the depth and duration of the eclipses, as well as the shape of the light curve between eclipses. By comparing these measurements to theoretical models of eclipsing binaries, astronomers can determine the sizes and other physical properties of the stars in the system.

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Answer:

Explained below

Explanation:

1) The human arm: This is a type of simple machine called "Lever". In this type of machine, the elbow acts as the fulcrum, the palm serves as the load because that's where we place the load we want to carry. While the inner part of the arm which is the inner part of the elbow represents the effort because that is the joint we mover when making use of our arms.

2) Pulleys: An example of this in the human body is the knee cap where the direction of an applied force is changed. Thus means as it is in motion, it alters the direction for which the quadriceps tendon pulls on the tibia.

3) wheel and axle: An example of this in the human body is the lateral rotation of the shoulder joint medial. The humerus which is the bone between the shoulder and elbow will act as the axle while the rotator will be the will because when it is rotated a little bit, the humerus will move along with it.

Answer:

The car would travel 60 miles in 2 hours.

Explanation:

The distance for an hour is already given, 30 miles per hour.

Given this you could multiply 30 by 2 which gives you 60.

The distance of the car is its speed times the time taken. The speed of the car is 30 miles per hour and time of travel is 2 hours. Then, the distance travelled is 60 miles.

Speed of a moving object is the measure of the distance travelled per unit time. The rate of speed is called velocity. Velocity of an object is a vector quantity.

As the object is covering more distance within small time, then the object is said to have greater speed. Speed of an object also depends on is mass.

Given the speed = 30 mph

time taken = 2 hours

distance  = speed  × time

= 30 × 2 = 60 miles.

Therefore, the distance travelled by the car is 60 miles.

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The charge is not different upon its exit versus its entry into the lightbulb because charge is conserved.

What is electrical charge?

Electrical charge, q is defined as the property of a matter which is carried by come of the elemental particles of matter which determined how it will be affected when placed in an electromagnetic field.

The unit of electrical charge is coulombs, C.

Th elementary particles of matter and their respective charges are:

protons: positive charge

electrons : negative charge

neutrons: no charge

According to a basic law of electricity, electrical charge is conserved. Therefore, the quantity of charge that enters the lightbulbs is equal to the quantity of charge that leaves the lightbulbs.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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The sun emits Ultra-violate  light but a light bulb does not.

A heated ball of incandescent gases at the centre of our solar system, the sun is a star. Beyond the distant Neptune and Pluto's orbits, it has a significant impact.

There wouldn't be any life on Earth without the sun's powerful energy and heat. Even though it is unique to us, the Milky Way galaxy is home to billions of stars similar to our sun. The Earth would be the size of a US coin if the sun were the height of a standard front door.

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Answer:

20watts

Explanation:

Formula for calculating power is expressed as;

Power = Work done/Time

Note that the unit of workdone is Joules

Unit of Time is seconds

Hence the unit of power is Joules/seconds or J/s

Hence if the rate at which energy is used up is 20.0J/s, the power will also be 20J/s or 20watts since they have the same unit.

Answer:

All of the inventors can be characterized as problem-solvers.

Explanation:

Took the practice

Answer:

All of the inventors can be characterized as problem-solvers.

Explanation:

If no external force on the Centre of mass remains stationary. In order to do that displacement in lighter body must be more than that of heavier ball.

The sum of the starting momentums of the two bodies when they collide is equal to the sum of their final momentums, according to the law of conservation of momentum.

The experimental system supports the law of conservation of linear momentum when a collision occurs between a heavier ball and a lighter ball in the absence of any other external forces.

The centre of mass does not move due to any external forces. A lighter body must have a greater displacement than a heavier ball in order for that to happen. Changes in an object's position are referred to as displacement. A vector quantity, it has both a direction and a magnitude. An arrow that directs viewers from the starting location to the ending position is used to symbolize it. As an illustration, the position of an object changes if it moves from position A to position B. Displacement is the name for this shift in an object's position.

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The frequency of this microwave is 9.375 x 10^9 Hz

The frequency of a certain microwave having a wavelength of 0.032m will be 9.375 x 10^9 Hz.

Let:

Using the relation between frequency and wavelength:

                                    v = f.λ

                                    c = f(0.032m)

                  3 x 10^8m/s = f(0.032m)

                                     f = 3 x 10^8/0.032

                                    f = 9.375 x 10^9 Hz

Electromagnetic Waves always travel at the speed of light. Electromagnetic Waves possess both electric and magnetic fields aligned perpendicularly to each other.

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Answer:

The shape of a bird's beak is a clue to its main source of food. The shape of a bird's beak is designed for eating particular types of food such as: seeds, fruit, insects, nectar, fish, or small mammals. Bird beaks have adapted over time to help birds find food within their habitat which allows them to survive. The beak, bill, and/or rostrum is an external anatomical structure found mostly in birds, but also in non-avian dinosaurs and some mammals. A beak is used for eating and for preening, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young.

Bird beaks come in a variety of shapes and sizes, and each is designed to assist the bird in obtaining the type of food that it is accustomed to.

Conical beaks, hooked beaks, pointed, thin beaks, chisel-like beaks, and other variations are possible.

The contour of a bird's beak indicates its primary food source. The shape of a bird's beak is intended for specific kinds of food.

Bird beaks have evolved over time to assist birds in finding food within their ecosystems, allowing them to survive.

The beak, bill, and rostrum are external anatomical structures that are found primarily in birds, but also in non-avian dinosaurs and some mammals.

A beak is used to eat, preen, manipulate objects, kill prey, fight, probe for food, courtship, and feed young.

Thus, in this way, having a sharp pointed beak limit what foods a bird can eat.

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A tennis ball following a parabolic trajectory without air resistance has two forces acting on it; gravity downward and a force keeping it moving forward this statement is false.

Objects fired into the air and traveling in that direction are referred to as projectiles. After the initial force that drives it, an object only perceives gravity. The projectile's route is the path that the object takes as it moves. Projectile motion can take one of three main kinds. horizontal projectile motion an oblique projectile motion. the trajectory of a missile moving upward.

The following are the key elements influencing projectile motion:

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Answer:

I'm pretty sure its 1080

Explanation:

force is = to mass multiplied by acceleration.

So 900 kg multiplied by 1.2m/s is = to 1080

I'm no expert so please tell me if I'm wrong so that I can improve.

Have fun buddy .

The magnitude of the average friction force on the box is calculated as 400 N

Energy conservation is the principle by which total energy remains constant in a system that is not subjected to external influence.

Given, length of the plane, d = 4 m

and height of the plane, h = 2 m

work done , w = 3200 J

kinetic energy on the top, KE = 0

Potential energy on the top,

P.E = weight x height

= 800 *2

So, P.E = 1600 J

Now, total work = K.E + P.E + W (friction)

So, W (friction) = 3200 - 1600

W (friction)  = 1600 J

As we know, W (friction) = F (friction) x d

F (friction) = 1600 / 4

Now, F (friction) = 400 N

Hence, the magnitude of average friction force on box is 400 N.

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Answer:

vertical columns

Explanation:

you should search up answers before putting them here. It will save time

The roller coaster will have the greatest amount of gravitational potential energy at the top of the incline, just before the cars are released to roll down the track.

Electrical energy is transferred between the main and secondary coils of a transformer through a magnetic circuit that is created by the iron core. A magnetic field that is continuously changing is produced in the iron core when an alternating current is fed through the primary coil. Energy is transferred between the coils as a result of the magnetic field's induction of a matching current in the secondary coil. Because of its high permeability and sensitivity to magnetism, the iron core can magnetize. A greater induced current is produced in the secondary coil as a result of the first coil's magnetic field being amplified by the iron core's magnetization. The effective transmission of electrical energy in a transformer depends on the magnetic characteristics of the iron core. The roller coaster will therefore have the most potential energy at the highest point of the trip.

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A frictionless piston-cylinder device contains 7.5 liters of saturated liquid water at 275 kPa. An electric resistance is turned on until 3050 kJ of energy is transferred to the water.

i) The mass of water can be determined by using the specific volume of saturated liquid water at the given pressure and volume. By using the specific volume data from the steam tables, the mass of water is calculated to be 6.66 kg.

ii) To find the final enthalpy of water, we need to consider the energy added to the water. The change in enthalpy can be calculated using the energy equation Q = m(h2 - h1), where Q is the energy transferred, m is the mass of water, and h1 and h2 are the initial and final enthalpies, respectively. Rearranging the equation, we find that the final enthalpy of water is 454.55 kJ/kg.

iii) The final state and the quality (x) of water can be determined by using the final enthalpy value. The final enthalpy falls within the region of superheated vapor, indicating that the water has completely evaporated. Therefore, the final state is a superheated vapor and the quality is 1 (x = 1).

iv) The change in entropy of water can be obtained by using the entropy equation ΔS = m(s2 - s1), where ΔS is the change in entropy, m is the mass of water, and s1 and s2 are the initial and final entropies, respectively. The change in entropy is found to be 10.13 kJ/kg.

v) The process described is irreversible because the water started as a saturated liquid and ended up as a superheated vapor, indicating that irreversibilities such as heat transfer across a finite temperature difference and friction have occurred. Therefore, the process is irreversible.

On a P-v diagram, the process can be represented as a vertical line from the initial saturated liquid state to the final superheated vapor state, crossing the saturation lines.

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The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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Answer:

C

Explanation:

lightning is an electrostatic discharge

The safest option in the lab if one need your vision to be corrected is  wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your ta or instructor for your school's policy.

When someone is performing any project in the chemistry lab, he needs to be extra care taken by himself and and the most importantly from the school. The safety goggles are used to protect the eyes from any spiling off the chemical.

One should wear corrective glasses under the safety goggles during the whole experiment.

Thus, wear corrective glasses under the safety goggles during the whole experiment.

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Given:

Due to the Doppler effect, when moving away from the source of a sound, _______

Required: To fill in the blank

Explanation:

The sound should get more quiet as the sound waves die out with increasing distance.

Final Answer: Due to the Doppler effect, when moving away from the source of a sound, the sound should get more quiet.

Answer:

Sedimentary rocks are deposited in layers as strata, forming a structure called bedding. Sedimentary rocks are often deposited in large structures called sedimentary basins.

Explanation:

Answer: Strata

Explanation: Strata are layers of rock, or sometimes soil. In nature, strata come in many layers. It is a term in sedimentary and historical geology; the singular is stratum. The study of strata is called stratigraphy.

Answer:a.Dry cell

Explanation: A dry cell is a type of electric battery, commonly used for portable electrical devices like a flashlight

Answer:a.Dry cell

Explanation: