What is the acceleration of a ball rolling 12 m/s to a stop in 3 seconds?

0.25 m/s^2
4 m/s^2
-0.25 m/s^2
-4 m/s^2

Answer:

Magnesium Chloride: MgCl2

Sodium Sulfate: Na2SO4

Answer:

give me brainliest

Explanation:

Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions, both in the atmosphere or with one on the ground, temporarily equalize themselves, causing the instantaneous release of as much as one gigajoule of energy. ... Humans have deified lightning for millennia.  

Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground.

Answer:

W = 15 N

Explanation:

The moments from the center mus be equal for balance to occur

 center is at 25 cm  ( for a 1/2 meter stick)

moment one :   15 cm * 20 N

moment two :   20 cm * W         these must be equal

   15 * 20 = 20 * W        W = 15 N

Answer: Inferring,Predicting,Analyzing

if this wasn't what you were looking for, here are some more science skills to help you pass you classes

- Evaluating.

- Generating possibilities.

- Formulating hypothesis.

- Communicating

Explanation: all these science skills will help you get through your science class with no struggles

Machine 1 has the greatest mechanical advantage among the given machines. To determine the machine with the greatest mechanical advantage, we need to calculate the mechanical advantage for each machine.

Machine 1: Mechanical Advantage = Output Force / Input Force = 50 N / 5 N = 10

Machine 2: Mechanical Advantage = Output Force / Input Force = 50 N / 10 N = 5

Machine 3: Mechanical Advantage = Output Force / Input Force = 50 N / 25 N = 2

Machine 4: Mechanical Advantage = Output Force / Input Force = 50 N / 50 N = 1

Comparing the mechanical advantages, we can see that Machine 1 has the highest mechanical advantage of 10. This means that Machine 1 can multiply the input force by 10 to produce the output force. It provides the greatest amplification of force among the four machines.

Machine 2 has a mechanical advantage of 5, Machine 3 has a mechanical advantage of 2, and Machine 4 has a mechanical advantage of 1. Therefore, Machine 1 has the greatest mechanical advantage among the given machines.

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Answer:

25.08m/s

Explanation:

mgh1 + 0.5mv1² = mgh2 + 0.5mv2²

h1 = 0m

v1 = u

h2 = 5m

v2 = 23m/s

putting the values into the formula above;

m(10)(0) + 0.5m(u²) = m(10)(5) + 0.5m(23²)

0 + 0.5mu² = 50m + 264.5m

0.5mu² = 314.5m

dividing through by m

0.5u² = 314.5

u² = 629

u = 25.08m/s

Therefore, the initial speed "u" = 25m/s

The physics professor should be 3.60m far from the physics building for the egg to successfully fall on professor's head, assuming freefall motion of the egg and acceleration to be 9.80 m/s^2.

The height of the building = 46 m

The height of the professor = 1.80 m

The effective height for freefall of the egg = 46.00 - 1.80 = 44.2 m

As S = ug + 1/2a\(t^{2}\)

44.2 = 0 + 1/2 × \(t^{2}\) × 9.8

\(t^{2}\) = (2 × 44.2) / 9.8

\(t^{2}\) = \(\sqrt{9.02}\)

\(t\) = 3.003 s

Let the distance travelled by the professor be x

The time taken by the egg to fall is equal to the time taken by the professor to reach the building through distance x

Speed with which the professor is walking = 1.20 m/s

Now as Distance = Speed × Time,

x = 1.20 × 3.003

x = 3.6036 meters.

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The index of refraction for the material is 1.612.

The index of refraction (n) of a material can be calculated using the formula:

n = c / v

where c is the speed of light in vacuum and v is the speed of light in the material.

Given that the speed of light in the material is 1.862x\(10^8\) m/s, we can substitute the values into the formula:

n = (3.00x\(10^8 m/s) / (1.862x10^8 m/s\))

Simplifying the expression:

n = 1.612

Therefore, the index of refraction for the material is approximately 1.612.

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The cannon has more mass than the ball.

option A is the correct answer.

The recoil of a cannon after firing a cannonball is a consequence of the conservation of momentum. According to this principle, the total momentum of a closed system is conserved, which means that the momentum of the cannon and cannonball before the firing must be equal to the momentum of the cannon and the cannonball after the firing.

Thus,  the cannon has more mass than the ball, which means that it has a greater inertia and will be more resistant to acceleration. This results in a smaller speed of recoil compared to the cannonball.

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Answer:

The work required is -515,872.5 J

Explanation:

Work is defined in physics as the force that is applied to a body to move it from one point to another.

The total work W done on an object to move from one position A to another B is equal to the change in the kinetic energy of the object. That is, work is also defined as the change in the kinetic energy of an object.

Kinetic energy (Ec) depends on the mass and speed of the body. This energy is calculated by the expression:

\(Ec=\frac{1}{2} *m*v^{2}\)

where kinetic energy is measured in Joules (J), mass in kilograms (kg), and velocity in meters per second (m/s).

The work (W) of this force is equal to the difference between the final value and the initial value of the kinetic energy of the particle:

\(W=\frac{1}{2} *m*v2^{2}-\frac{1}{2} *m*v1^{2}\)

\(W=\frac{1}{2} *m*(v2^{2}-v1^{2})\)

In this case:

Replacing:

\(W=\frac{1}{2} *2145 kg*((12\frac{m}{s} )^{2}-(25\frac{m}{s} )^{2})\)

W= -515,872.5 J

The work required is -515,872.5 J

The amount of work needed by the vehicle to decrease its speed from 25 m/s to 12 m/s is 515872.5 J.

The amount of work required by the truck to decrease its speed can be calculated using the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The amount of work needed by the vehicle to decrease its speed from 25 m/s to 12 m/s is 515872.5 J.

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Answer:

A student could conclude that the cart gained momentum as it rolled down.

Explanation:

If the cart was allowed to roll down the ramp from rest, it means that the initial velocity of the cart is zero (0). Also, if the final velocity of the cart became 25 cm/s, it means that the velocity of the cart increased from 0 to 25 cm/s.

Therefore, A student could conclude that the cart gained momentum as it rolled down.

Answer:

46.5 N

Explanation:

attached is explanation

the mutcd advises examining emergency vehicle lighting policies with the intent of reducing lighting use as much as possible without endangering_those __at the scene.

what is MUTCD ?

The United States Department of Transportation's Federal Highway Administration issued the Manual on Uniform Traffic Control Devices (MUTCD) for Streets and Highways to explain the standards for the construction, installation, and operation of traffic signs, surface markings, and signals.

All traffic control devices must meet the national standards outlined in the MUTCD. The MUTCD is a nationwide standard on which all public agencies and owners of privately held public highways rely. Because of the MUTCD, all road users benefit from greater safety and mobility.

 The MUTCD recommends reviewing emergency vehicle lighting rules in order to reduce lights consumption as much as feasible without harming individuals on the site.

recent edition of the official FHWA document is a July 2022 PDF file that integrates the 2009 MUTCD with Revisions 1, 2, and 3.

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Answer:

Thirty years ago, the culture of American sports took a new course. An idea shouldered by a former sports communication executive, along with his son and other partners, would go on to transform the way we consume, analyze and interpret the world of athletics, and would influence international sport culture as well. While sports have always acted as a medium for those looking to escape the drudgeries of work, a way to channel negative emotions into something engaging and entertaining, ESPN presented a new opportunity for fans: an all-encompassing cable network for not only sports itself but also for the culture surrounding sports.,

Explanation:

Hope this helped!

The given lengths at 0 °C are 2.5 m

Let l₀ be the given lengths of the glass and steel rods at 0 °C. Let l and l' be the lengths of the glass and steel rods at 100 °C respectively.

From our expression for linear expansivity,

l = l₀ + l₀αΔθ where α = linear expansivity of glass = 0.000008/°C and Δθ = temperature change = θ - θ' where θ = 100 °C and θ' = 0 °C. So, Δθ = 100 °C - 0 °C = 100 °C.

Also,

l' = l₀ + l₀α'Δθ where α' = linear expansivity of steel = 0.000012/°C and Δθ = temperature change = θ - θ' where θ = 100 °C and θ' = 0 °C. So, Δθ = 100 °C - 0 °C = 100 °C.

Since the difference in their lengths at 100 °C = 0.001 m, we have that

l - l' = l₀ + l₀αΔθ - (l₀ + l₀α'Δθ)

l - l' = l₀ + l₀αΔθ - l₀ - l₀α'Δθ)

l - l' = l₀αΔθ - l₀α'Δθ

l - l' = l₀(α- α')Δθ

Making l₀ subject of the formula, we have

l₀ = (l - l')/[(α- α')Δθ]

Substituting the values of the variables into the equation, we have

l₀ = (l - l')/[(α- α')Δθ]

l₀ = 0.001 m/[(0.000008/°C - 0.000012/°C)100 °C.]

l₀ = 0.001 m/[(-0.000004/°C)100 °C.]

l₀ = 0.001 m/-0.0004

l₀ = -2.5 m

Neglecting the negative sign,

l₀ = 2.5 m

So, the given lengths at 0 °C are 2.5 m

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The mirror must be at least half the height of the person in front of it. Because the individual is 180 cm tall

define height ?

the distance measured from bottom to top or (for a standing person) from head to foot:

"columns reaching a height of 65 feet"

the most intensive period or segment of something: "the peak of tourism season"

Angle of incidence At the point of incidence, the angle between the incident ray and the normal to the reflecting surface.

Angle of reflection At the point of incidence, the angle between the reflected ray and the normal to the reflecting surface.

According to the law of reflection, the angle of reflection equals the angle of incidence.

Consider the following scenario: A light beam from an item is reflected by a mirror and enters an eye, as shown in the image below. If the object and the eye are both at the same distance from the mirror, the law of reflection states that the point of incidence must be precisely halfway between the two.

The ray's point of incidence must be 180 cm - 3 cm = 177 cm from the earth. This represents the mirror's top edge.

The point of incidence of this beam must be 174 cm/2 = 87 cm since her eyes are 174 cm from her feet. This represents the mirror's lower edge.

As a result, the bottom edge of the mirror must be 87 cm from the ground, and the vertical dimension of the mirror must be 177 cm - 87 cm = 90 cm, or half the person's height.

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The velocity of the second marble after the collision is 0.47 m/s

According to conservation of linear momentum

The law of conservation of momentum states that in an isolated system the total momentum of two or more bodies acting upon each other remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed

M1u1 + M2u2 = M1v1 + M2v2

0.018 x 0.42 + 0.018 x 0.32 = 0.018 x 0.27 m/s + 0.018 x v2

0.00756 + 0.00576 = 0.00486 + 0.018 x v2

0.01332 = 0.00486 + 0.018 x v2

0.00846/0.018 = v2

v2 = 0.47 m/s

Hence, velocity of the second marble after the collision is 0.47 m/s

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Answer:

Explanation:

1. when both sides of the reactants and the products are equal

like h+oh ⇒ h20

hydrogen has 2 atoms on both sides and oxygen  has one  on both sides

2. no they are put to balance the equation

3. nope they are treated equally as all the other states

4. no if u are talking about a formula unit like NaCl for example it is aqueous not each element taken on its own if u are talking about just elements then i said before all states are treated equally

5. yup

The net force on the top charge due to the other two charges is zero, and the charge will remain in equilibrium.

We can use Coulomb's law to calculate the force exerted by one charge on another. Coulomb's law states that the magnitude of the electrostatic force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.

Mathematically, it can be expressed as:

F = (kq1q2)/r^2

where;

In this case, we have three charges of equal magnitude q placed at the vertices of an equilateral triangle of side length 1. We can calculate the distance between any two charges using the geometry of the equilateral triangle. The distance between any two adjacent charges is 1, and the distance between any two opposite charges is √3.

Let's consider the force exerted on one of the charges, say the one at the top of the triangle, due to the other two charges at the bottom left and bottom right vertices. The distance between the top and bottom left charges is 1, and the distance between the top and bottom right charges is also 1.

Therefore, the magnitude of the force exerted by the bottom left charge on the top charge is:

F1 = (kqq)/1^2 = k*q^2

Similarly, the magnitude of the force exerted by the bottom right charge on the top charge is also k*q^2. Since the two forces are acting in opposite directions along the same line, we can simply subtract them to find the net force:

F_net = F1 - F2 = kq^2 - kq^2

F_net = 0

Therefore, the net force on the top charge due to the other two charges is zero, and the charge will remain in equilibrium.

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In an open circuit like the picture the light bulb will be off. So, option (C) is correct.

Electric circuit is a way for current to flow through electricity. An electric circuit consists of a source of energy for the charged particles that make up the current, like a battery or generator; sources of current-using equipment, like lamps, electric motors, or computers; and the connecting wires or transmission lines.

Ohm's law and Kirchhoff's rules are two of the fundamental mathematical laws that define how electric circuits function.

In the given diagram, the circuit is open. So, no current passes through it and the light bulb will be off. Hence, option (C) is correct.

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ANSWER:

2 meters

STEP-BY-STEP EXPLANATION:

The work is given by the following equation:

From the above we can solve for d which is the distance and substitute the value of the work (50 J) and the force (25 N) given in the statement and thus obtain the distance the grocery bag is lifted

It lift about 2 meters

Answer:

917 N

Explanation:

I hope this helps!!

The airplane change in velocity be 120 m/sec

The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.

The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.

acceleration = velocity/time

Velocity = acceleration * time

Velocity = 60*2

Velocity = 120 m/sec

The airplane change in velocity be 120 m/sec

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The reading on the scale will be equal to the normal force exerted by the scale on the person. We can use Newton's second law of motion, which states that the net force acting on an object is equal to its mass times its acceleration:

Net force = mass x acceleration

The person's mass can be calculated using their weight, which is equal to their mass times the acceleration due to gravity (9.81 m/s^2):

Weight = mass x acceleration due to gravity

686 N = mass x 9.81 m/s^2

mass = 70 kg

Now we can use Newton's second law to find the normal force exerted by the scale:

Net force = mass x acceleration

Normal force - Weight = mass x acceleration

Normal force - 686 N = 70 kg x 4.9 m/s^2

Normal force = 1029 N

Therefore, the reading on the scale will be 1029 N. Answer: 1029 N.

The statements that apply to inertia are that it is a force that maintains moving objects in motion, a force that keeps stationary objects at rest, a force that causes stationary objects to naturally resist motion, and a force that causes moving objects to naturally resist changes in velocity.

According to Newton's first law, until pushed to alter its condition by the intervention of an external force, every object will continue to be at rest or in uniform motion along a single direction.

As given all the following the statements that are true about inertia are,

1. Inertia is the force that keeps a moving object in motion.

2. Inertia is the force that keeps a stationary object at rest.

3. Inertia is the natural tendency of a stationary object to resist motion.

4. Inertia is the natural tendency of a moving object to resist a change in its velocity.

Thus, all the given options are correct about inertia.

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Answer:

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