A construction worker puts 20 J of energy in to one strike of his hammer on the head of a nail. The energy transferred to driving the nail into the wood is 8.0 J. What is the efficiency of the construction worker's hammering? (2 sig figs and answer in a percentage)

Answers

Answer 1

Answer:

The efficiency of the constuction is 9.0

Explanation:


Related Questions

how is the modern day periodic table arranged group experiencing Oppression/loss of fredom?

Answers

The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency. Atomic radius patterns are observed throughout the periodic table. Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. As a result, the atomic radius decreases. That is a science method reasoning on why it lost its freedom, hope this helps!

Which caused the greatest increase of the growth of the human population

Answers

Answer:

This rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age. By 2000 the population counted 6 billion heads, however, population growth (doubling time) started to decline after 1965 because of decreasing birth rates.

Explanation:

The main cause of human population growth is increased well-being.

Well-being is a term to refer to the state of satisfaction of economic, social, labor, psychological, biological needs, among others of the human.

Therefore, when civilizations and societies became more complex, many issues such as health, food, hygiene, education, government, among others, improved, giving more well-being to their inhabitants.

Well-being has evolved with society and today people have access to many things, services, and goods that give them well-being, improving their quality and life expectancy. Therefore, the correct answer is well-being.

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In a nuclear power plant, uranium atoms ______

A. Combine and give off heat energy
B. Split and give of heat energy
C. Burn and give of heat energy
D. Split and give off electrons

Answers

Answer:

All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation. More neutrons are also released when a uranium atom splits.

A set of charged plates have an
area of 8.22*10^-4 m^2 and
separation 2.42*10^-5 m. The
plates are charged with
5.24*10^-8 C. What is the
potential difference V between
the plates?
(Unit = V)

pls hurry <3

Answers

Answer:

175

Explanation:

its for Acellus

The potential difference is V=1.743*10^-7

The voltage is generally referred to as the electric potential difference and  it can be measured using a voltmeter. The electrical potential difference between the two plates is expressed as q=CV.

CALCULATION

we know,

q=CV

q={EA/d}*V

here q= 5.24*10^-8C

       A=8.22*10^-5m^2

       d=2.42*10^-8m

therefore , C={( 8.85*10^-12)*(8.22*10^-5)}/(2.42*10^-8)

                 C=3.006*10^-1

q=CV

q/C=V

V=1.743*10^-7

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I NEED THIS DONE ASAP I WILL MARK YOU THE BRAINLIEST BUT NO LINKS
Put the correct terms with the correct pictures

Answers

Answer:

1. Static Friction

2. Sliding friction

3. Fluid friction

4. is rolling friction

Sorry if i am wrong

Explanation:

Friction always acts
in the same direction as motion.
in the opposite direction as motion.
at a 30 degree angle to the direction of motion.
perpendicular to the direction of motion.

Answers

Explanation:

friction always acts in the opposite direction as motion.

stay safe healthy and happy...

What is one problem that you think needs to be solved so that your future is safer for your children?

Answers

Answer:

Systemic racism

Explanation:

Un tubo cilindrico hueco de cobre mide 3 m de longitud tienen un diametro exterior de 4cm y un diametro interior de 2 cm¿cuanto pesa?

Answers

Answer:

 W = 9.93 10² N

Explanation:

To solve this exercise we must use the concept of density

           ρ = m / V

the tabulated density of copper is rho = 8966 kg / m³

let's find the volume of the cylindrical tube

           V = A L

           V = π (R_ext  ² - R_int ²) L

let's calculate

          V = π (4² - 2²) 10⁻⁴  3

          V = 1.13 10⁻²  m³

         m = ρ V

        m = 8966 1.13 10⁻²

        m = 1.01 10² kg

the weight of the tube

        W = mg

         W = 1.01 10² 9.8

         W = 9.93 10² N

verdadero o falso de La energía interna es la energía térmica asociada al objeto en virtud del movimiento de sus moléculas.

Necesito ayuda, porfa.

Answers

Answer:

Es la energía cinética interna total de un objeto debido al movimiento aleatorio de sus ... a es la energía que posee un objeto o cuerpo en virtud del movimiento de sus ... Si el movimiento de estas moléculas y átomos es más rápido, se dice que el ... Por lo tanto, la energía térmica asociada con la conducción resulta de la .

Explanation:

The flooding of the Mississippi River

A) is always going to produce negative effects
B) deposits fertile soil in the Mississippi Delta.
C) deposits fertile soil in the western part of the state.
D) is responsible for the formation of the Mississippi Delta.

Hint: Rivers are agents of erision.

Answers

Answer is chope this helps

If two proton approach each other with speed of 400m\s and 450m\s respectively what is the total momentum of the two particle system

Answers

Answer: [tex]83.65\times 10^{-27}\ kg.m/s[/tex]

Explanation:

Given

The velocities of the protons are 400 m/s and 450 m/s

Mass of the Proton is [tex]m=1.673\times 10^{-27}\ kg[/tex]

Since they travel in the opposite direction, therefore, their momentum cancels out each other.

Momentum is the product of mass and velocity

[tex]\therefore m(450-400)\\\Rightarrow 1.673\times 10^{-27}\times 50\\\Rightarrow 83.65\times 10^{-27}\ kg.m/s[/tex]

The direction of momentum is in the direction of proton having 450 m/s velocity.

what is the energy of an electromagnetic wave that has a frequency of 5.0 x 10⁵ Hz?

Answers

Answer: 3.3 x 10^-28 J

Explanation: just answered on a quiz!! :)

A hair dryer uses 1100 W of power
when connected to a 110 V outlet.
What is the resistance of the hair
dryer?

Answers

Answer:10

Explanation:acellus

Write three things you already know about golf, three things you want to know, and three things you learned

Answers

Answer:

What I know, want to know, and have learned

Explanation:

I know

1. You have to have a golf ball

2. You have to have a golf club

3. Its nice to have a golf cart

Want to know:

1. Where can I play

2. How to play

3. Is it a common sport

Have learned:

1. Golf is hard

2. Top golf is a nice place to golf

3. The goal is to make the ball into the hole

A 12 kg
mass is lifted to a height of 2 m. What is its potential energy
at this position?

Answers

Answer:

Explanation:

Potential energy is the energy stored within an object, due to the object's position, arrangement or state

Answer:

240joules

Explanation:

P:E = MGH

mass 12kg

g is constant as 10m/s²

h is 2m

therefore, 12*10*2 =240joules

Which factor increases as a result of increasing altitude?

Answers

heights of sea level, and space between gas molecules are the factor that will increase as a result of increasing altitude!!!

why do plants on the floor of a rainforest often have reddish-colored leafs?
A, to help absorb as much sunlight as possible.
B, to camouflage themselves from predators.
C, to attract pollinators
D, To warn animals that the leaves are poisonous.
PLEASE HELP BY TODAY THANKS :)

Answers

Answer:

c i hope this helps

Explanation:

A stun gun or TASER is designed to put out a few seconds worth of electric pulses that impress a
voltage of about 1200 V across the human body. This results in an average current of approximately 3
mA into a human body. Using these figures, estimate the resistance of the human body.

Answers

Answer:

Resistance = 400000 Ohms

Explanation:

Given the following data;

Voltage = 1200 V

Current = 3 mA = 3/1000 = 0.003 A

To find the resistance;

Voltage = current * resistance

Resistance = 1200/0.003

Resistance = 400000 Ohms

Which is a benefit of a scientific model?
A.) It provides a complete image of the concept it is modeling.
B.) It provides an accurate scale of the concept it is modeling.
C.) It provides an accurate visual representation of the texture and coloring of the concept it is modeling.
D.) It provides a useful understanding of the concept it is modeling.

Answers

D.) it provides a useful understanding of the concept it is modeling.

Question 8
Swimming in an open body of water (like a river, lake, or ocean) is different from swimming in a

Answers

Answer:

pool

Explanation:

I think

Answer: Pool

Hope this helps

How do I solve this problems

Answers

My best advice would be to just keep on practicing and work with whatever notes you have :)

Explain what cardiovascular exercise is in your own words. Explain the benefits of it and how it is different than muscular strength. Give 3 examples of cardiovascular exercises/activities

Answers

Cardiovascular exercise is a form of exercise that can build up your respiratory fitness and improve you endurance. It is different from muscular strength because it is more about endurance then repetition which is need for muscular strength. 3 example of cardiovascular fitness are running, swimming, and biking. Hope this helps

Where, When, What occured in Australian Wildfires?
1. Where?
2. When?
3. What ?

Answers

On 11 November a fire started in the Ravensbourne area near Toowoomba, which burnt through over 20,000 hectares (49,000 acres) of bush across several days, destroying six houses.

a 20 A fuse is connected in series with a circuit containing a 240 V source. What is the minimum resistance required to prevent the fuse from melting

Answers

Answer:

12 ohms

Explanation:

you just divide 240 and 20

240 V/ 20 A = 12 ohms

The edge effect in habitats are caused by:

A. habitat fragmentation
B. biological magnification
C. eutrophication
D. destruction of habitat

Answers

Habitat fragmentation

The edge effect in habitats is caused by habitat fragmentation. Therefore, option A is correct.

Habitat fragmentation refers to the process by which large, continuous habitats are divided into smaller, isolated fragments due to human activities or natural events. It occurs when natural landscapes are altered or disrupted. It results in the fragmentation of once-continuous habitats into smaller patches.

This fragmentation can happen through various means, such as the construction of roads, urban development, agriculture, deforestation, or natural events like wildfires or floods.

Learn more about habitat fragmentation, here:

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An event in when a large percentage of all species become extinct is calle

A. biodiversity shift
B. evolutionary shift
C. mass extinction
D. background extinction

Answers

the answer is d. background extinction

A vector is 14.4 m long and
points in a 133 degree
direction.
Find the x-component of the
vector.
X-component (m)

Answers

Answer:

Explanation:

The x-component is found in the magnitude of the vector times the cosine of the angle.

[tex]A_x=14.4cos133[/tex] and, to 3 sig dig,

[tex]A_x=-9.82m[/tex]

A ball is released from a height of 20 metres. Calculate; 1. The time it takes to fall 2. The velocity with which it hits the ground

Answers

Answer:

Final velocity of ball = 20 m/s

Explanation:

Given:

Height when ball released = 20meter

Find;

Time taken to fall

Final velocity of ball

Computation:

Initial velocity of ball = 0 m/s

Acceleration due to gravity = 10 m/s²

Using equation of motion;

S = ut + (1/2)(g)(t²)

20 = (0)(t) + (1/2)(10)(t²)

20 = 5(t²)

(t²) = 20 / 5

(t²) = 4

Time taken to fall = 2 second

V = u + at

V = 0 + (10)(2)

Final velocity of ball = 20 m/s

explain how to find the surface area of a rectangular pyramid
...................

Answers

Answer:

So let's first start with the base which is a rectangle remember that the formula to solve the area

Explanation:

two charges create 8.00 N of electric force on each other. if you increase their distance to twice its original value, how much electric force do they exert on each other

Answers

Answer:

2.00 (right on acellus)

Explanation:

doubling the distance between two charges makes F (8.00) quarter, so you would just do 8.00*1/4

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