A penny is pushed off a desk 2m high. How long does it take the penny to hit the floor?

The force applied by the hammer can be calculated using work done. W = F.d and the final kinetic energy is zero. Hence work done is equal to kinetic energy.

The kinetic energy of the hammer before striking the nail is

1/2mv²=0.5×(6)²=18 Joule

The work done in striking the nail is given by force × distance.

Therefore, force is given by:

Force = work done / distance = 18 / 0.01 = 1800 N

From Newton’s second law, force = mass × acceleration, acceleration is given by:

a = force / mass = 1800 / 0.5 = 3600 m/s²

The time required for the hammer to come to rest is given by the equation,

v = u + atWhere u = initial velocity = 6 m/sv = final velocity = 0 m/sa = acceleration = 3600 m/s²t = time taken

We can calculate t as follows:0 = 6 + (3600)t-6 = 3600tT = 6/3600 = 0.00167 secondsb.

Average force exerted on the nailWe have already found the force exerted by the hammer on the nail as 1800 N. This is the force exerted for a duration of 0.00167 seconds.The average force exerted on the nail is given by the equation:

Average force = change in momentum / time takenThe momentum of the hammer before striking the nail is:p = mv = 0.5×6 = 3 kg m/s

The momentum of the hammer and nail after the collision is:p’ = 0 (since both are at rest)Therefore, change in momentum is:

Δp = p’ - p = -3 kg m/s

Average force = -3 / 0.00167 = -1796.4 N

Average force exerted on the nail is 1796.4 N, opposite in direction to the motion of the hammer.

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Answer:

It will take the marathon runner about 28.27 s to run 158 m at a pace of 5.5 m/s

Explanation:

Time = Displacement / Velocity

Since everythign is already in the same terms (meters, adn seconds) we dont have to convert everything just plug it in

Time = 158 m / 5.5 m/s

time = 28.27 s

Answer:

The closest distance the negative charge gets to the positive charge is given by the expression:

r = (k * q^2) / (m * v^2)

Explanation:

To find the closest distance the negative charge gets to the positive charge, we can analyze the motion of the negative charge under the influence of Coulomb's attraction.

Given that the negative charge is initially moving with a constant velocity and would miss the center of the fixed positive charge by a perpendicular distance of b, we can consider the perpendicular distance b as the impact parameter.

The motion of the negative charge can be treated as a projectile motion with the Coulomb force acting as a centripetal force. As the negative charge approaches the positive charge, the Coulomb force causes it to deviate from its straight-line path and approach the positive charge.

The closest distance the negative charge gets to the positive charge occurs when the centripetal force due to Coulomb's attraction is equal to the gravitational force acting on the negative charge.

Using the equation for Coulomb's force, we have:

k * (q^2) / r^2 = m * (v^2) / r

Simplifying and rearranging the equation, we get:

r = (k * q^2) / (m * v^2)

Note that this expression assumes the motion occurs in a straight line and the interaction is purely Coulombic. In reality, the motion of the negative charge may be more complex due to other forces and factors.

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Electric and hydrogen are promising alternative energy sources for transportation, offering benefits such as reduced emissions and lower operating costs, although they also face challenges related to infrastructure and production methods.

Electric and hydrogen are two promising alternative energy sources for transportation that have gained significant attention in recent years. Here are some key points about each:

Electric Vehicles (EVs): EVs use electricity stored in batteries to power an electric motor.

They offer several advantages, including zero tailpipe emissions, reduced dependence on fossil fuels, and lower operating costs compared to traditional internal combustion engine vehicles.

The growth of EV infrastructure and advancements in battery technology have contributed to their increasing popularity.

Hydrogen Fuel Cell Vehicles (FCVs): FCVs use hydrogen gas to generate electricity through a chemical reaction in a fuel cell, which then powers an electric motor. FCVs produce zero tailpipe emissions since the only byproduct is water vapor.

Hydrogen fuel can be refueled quickly, similar to traditional gasoline vehicles, providing a longer driving range compared to battery-powered EVs.

Both electric and hydrogen vehicles have their own set of challenges. For EVs, limited charging infrastructure and range anxiety remain concerns, although they have been improving over time.

Hydrogen FCVs face challenges related to hydrogen production, storage, and distribution infrastructure.

Additionally, the overall environmental impact of these alternative energy sources depends on the methods used for electricity or hydrogen production.

The adoption of alternative energy sources for transportation is a complex and evolving field.

It often involves a combination of technological advancements, policy support, and infrastructure development to enable widespread adoption and address existing challenges.

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Answer: thermodynamics energy

Answer: DISSOCIATIVE IDENTITY DISORDER

Explanation:

Humans emit waves at a frequency of 33.3 THz, which correspond to the infrared portion of the electromagnetic spectrum.

a) With a wavelength of 9.0 microns, the frequency of electromagnetic waves emitted by humans is roughly 33.3 THz. (terahertz).

b) These waves are part of the electromagnetic spectrum's infrared region, which is responsible for heat transfer and is widely used in technologies such as remote controls and thermal imaging cameras. Infrared waves belongs to the region of the spectrum where the wavelength is high but the frequency is low but they have shorter wavelength and longer frequency than the microwaves.

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Answer:

Según la actitud del hablante las oraciones se clasifican en enunciativas, interrogativas, etc. ... adverbios o expresiones que complementan a toda la oración (COr): ojalá, quizá.

Explanation:

The ratio of the three circles they draw is equal to the distances from the stations to the epicenter.

Scientists use triangulation to find the epicenter of an earthquake. If seismic data are collected from at least three different locations, their intersection can be used to determine the epicenter. Each earthquake is recorded by numerous seismometers placed in different directions.

The epicenter is the point on the surface directly above the earthquake. A seismic station uses seismometer recordings to detect earthquakes. Determining the epicenter of an earthquake requires records from three separate seismic stations. Triangulation is a method of uniquely identifying earthquakes using distance information determined from three seismic stations.

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Answer: 125 m/s

Multiply 15 m/s by 5.0 minutes, because this will give you the product.

15 x 5.0 = 125.

Add the m/s sign to the 125. 125 m/s.

Answer = 125 m/s. Hope this helps!

The force of gravity acting between the earth and a 125-kg person standing on the surface of the earth is 1226.7N.

This is calculated using Newton's law of universal gravitation, which states that the gravitational force between two objects is equal to the product of their masses, divided by the square of the distance between them, multiplied by the gravitational constant. In this case, the masses of the Earth and the person are both known, and the distance between them is assumed to be the radius of the Earth.

Therefore, the gravitational force between the Earth and the person can be calculated as:

F = (G x ME x Mperson) / (rEarth)²

Where:

Plugging in the values, the gravitational force between the Earth and the person comes out to be 1226.7N.

.

Therefore, the force of gravity between the earth and a 125-kg person standing on the surface of the earth comes out to be 1226.7N.

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True or false: Below the wave base there is no wave action (from surface waves).  

Wave action refers to the movement of water caused by the transfer of energy from wind or other sources. Surface waves, which are waves that travel along the surface of the water, have a wave base which is the point at which the wave starts to become noticeable to the eye.

Below the wave base, there may still be some water movement due to internal waves or subsurface currents, but the surface of the water will be relatively calm and there will be no visible wave action. These internal waves and currents are caused by the movement of water within the ocean or other bodies of water and are not directly related to wind or other external sources of energy.

In summary, true or false: below the wave base there is no wave action (from surface waves).  

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Answer: gravity

normal force

friction

Explanation:

A force is refered to as the interaction which when unopposed, will lead to a change in an objects motion. The velocity of an object will be changed when force is applied.

Since Alisa s riding down a hill and she and the skateboard are considered to be a single object, then the forces that are acting on her include gravity, normal force and friction.

Answer:

calcium carbonate is transformed into calcium sulfate

Explanation:

Limestone stones are formed by calcium carbonate (Ca Co3), when acid rain falls with a little H2SO2, a chemical reaction of the type

          Ca Co3 + H2SO4 → CO2 + H2O + CaSo4

Calcium sulfate is much weaker than alatium carbonate, which is why the stone tends to break under its weigh

Answer:

Unbalanced

Explanation:

There is an acceleration. Look at the direction of the arrows.

Answer:

fire

Explanation:

The combustion of propane (C3H8) formed the products of carbon dioxide and water.

Alkanes are known as saturated straight-chain aliphatic hydrocarbons. They undergo combustion reactions with oxygen. Like other alkanes, Propane exhibits combustion reaction in the same way as other alkanes do.

During combustion reaction, Propane burns in the presence of abundant oxygen to produce water and carbon dioxide. This combustion reaction librates a heat of about 50 MJ/kg.

The equation of the reaction can be shown as:

\(\mathbf{C_3H_8 + 5O_2 \to 3CO_2 + 4H_2O}\)

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Answer:

\(150 kg\cdot m/s\)

Explanation:

Same as if he was walking uphill, or horizontally. Momentum is defined as the product of mass times velocity. \(p = mv = 15\cdot 10 = 150 kg\cdot m/s\)

Answer:

1. is B and 2. is A

Explanation:

Answer:

1. Displacement

2.  5 m/s  400 ÷ 80 = 5

Explanation:

Answer:

See the explanation for the answer.

Explanation:

Question 1: Both

Question 2: E

Question 3: P

Question 4: E

Question 5: E

Question 6: Both

Question 7: E

Question 8: Both

Question 9: E

Question 10: E

Question 11: E

Question 12: Both

Question 13: The three statements that the modern cell theory made were how in all organisms the cell is the smallest living unit, how all living things consist of cells, and that all cells are "created" from already pre-existing cells.

I think that these answers are correct. I'm sorry if they aren't, I tried my best with the assignment.

Have a lovely day!

The force of friction on the object is 500 N.

The acceleration of the object is 0 m/s²

To determine the force of friction, we need to compare the applied force to the maximum force of static friction that can be exerted between the object and the table.

The maximum force of static friction that can be exerted is given by:

f_s = μ_sN

where;

The normal force N is equal to the weight of the object, which is:

N = mg

Substituting the given values, we get:

N = 250 kg x 9.8 m/s²

N = 2450 N

And the maximum force of static friction is:

f_s = 0.30 x 2450 N

f_s = 735 N

Since the applied force of 500N is less than the maximum force of static friction, the force of friction will be equal to the applied force:

f_f = 500 N

Since the applied force is less than the maximum force of static friction, the object remains stationary and the acceleration is zero.

Therefore:

a = 0 m/s²

Note that if the applied force were greater than the maximum force of static friction, the object would begin to move and we would need to consider the force of kinetic friction instead of the force of static friction.

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The displacement of the ball is zero.

What is displacement?

The smallest distance between the initial and final position of an object.

What are the equations of motion?

There are three equations of motion that completely describes the motion of an object.

The first equation of motion gives the relationship between the initial velocity, final velocity, acceleration, and time.

The second equation of motion gives the relationship between the initial velocity, displacement, acceleration, and time.

The third equation of motion gives the relationship between the initial velocity, final velocity, acceleration, and displacement.

Given time, initial velocity, and acceleration, the displacement can be calculated using the second equation of motion. The second equation of motion is,

s=u*t+(1/2)*a*t^2

Here, u=25 m/sec, a=-25 m/sec and t=2.0 sec.

Put the values in the formula and calculate the displacement.

s= (25)*(2.0)+(1/2)*(-25)*(2.0)^2

s=50-50

s=0 m.

Hence the displacement of the ball is zero.

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Answer:

c) more energy is trapped, which leads to an increase in Earth's global temperature

Explanation:

Greenhouse effect is caused by the trapping of the reflected energy from the surface of the earth into the atmosphere by some gases. Thus with time causes more energy to be trapped in the atmosphere, which cause an increase in the average ambient temperature of the earth. Because the energy could not escape out into space beyond the earth's atmosphere. Therefore, an increase in Earth's global temperature.

So that the correct option in the given question is C.

Answer:  \(135.48\ m/s^2\) ,\(13.82g\)

Explanation:

Given

Missile velocity raises from 0 to \(8.4\ km/s\)

Time taken \(t=62\ s\)

Convert velocity into m/s

\(\Rightarrow 8.4=8.4\times 1000=8400\ m/s\)

Acceleration is the change of velocity w.r.t time

\(\Rightarrow a=\dfrac{8400-0}{62}\\\\\Rightarrow a=135.48\ m/s^2\)

In terms of gravity, it is

\(\Rightarrow \dfrac{135.483}{9.8}=13.82\)

Therefore, acceleration in terms of g is \(13.82g\)

The given unbalanced equation is:Al2(SO4)3 + Ca(OH)2 → Al(OH)3 + CaSO4

Chemical equations are balanced by adjusting the coefficients of the molecules on either side of the equation. To balance the equation, the same number of atoms should be present on both sides. To balance a chemical equation, the coefficient should be a whole number. The balanced equation should have the lowest common multiple coefficients for the molecules. Balancing the equation helps to understand the relationship between the reactants and the products involved in the chemical reaction.

To balance the above chemical equation, the coefficients should be added to the molecules on the left and right of the equation in order to have the same number of atoms on both sides. And the balanced chemical equation would look like this:

Al2(SO4)3 + 3 Ca(OH)2 → 2 Al(OH)3 + 3 CaSO4

In the balanced chemical equation, the coefficient in front of the CaSO4 is 3.

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The acceleration of car from 4m/s to 30m/s in 3s is \(a = 8.67 m/s^2\).

The initial velocity of car is 4 m/s.

The final velocity of car is 30 m/s.

Time is 3 seconds.

The acceleration is defined as the change in velocity per unit time. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

The Newton's first equation of motion is written as,

\(a = \dfrac{v-u}{t}\)

Substituting the values for v, u and t, calculate the acceleration of car.

\(a = \dfrac{30-4}{3}\)

\(a = 8.67 m/s^2\)

The acceleration is 8.67 m/s^2.

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--The complete question is, A car accelerated from 4m/s to 30m/s in 3s. Calculate the acceleration.--

Answer:

b. 1.1 m/s c. -1.1 m/s

Explanation:

b.

m x v=f x t

The mass is 10 kg

10 x v (equation for momentum) = f x t (impulse)

you would find the impulse by finding the area under the graph, and then dividing by the mass

So in this case:

10 x v = 11

then divide by the mass

v = 11/10

v= 1.1 m/s

c.

F x t = impulse

we are trying to find force (magnitude)

impulse/t = F

we said that in order for it to stop the impulse for b would be 11, so if thats the case it would be 11 but it would be negative because when going in a positive direction and suddenly stopping the direction changes.

-11/t = F

to find t all we need to do is find the amount of seconds between 10 and 20, that would be 10.

-11/10 = F

F= -1.1 m/s

Answer B:

The velocity of the box at 10 seconds is :

              m x v=f x t

Given Information :

Mass(m)=10kg

Therefore, the velocity of the box at 10 seconds is 1.1m/s.

Answer C:

The magnitude and direction of that force be :

F x t = impulse

To find t all we need to do is find the amount of seconds between 10 and 20, that would be 10.

The magnitude and direction of that force will be -1.1m/s.

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Explanation:

No. Surface contact area also no. The main issue is the types of materials in contact. Surface roughness somewhat matters. Certain surfaces such as ice are special in that pressure melts the ice.