In which of the following sentences is work used in the everyday sense of the word?

a. Lifting a heavy bucket involves doing work on the bucket.
b. The force of friction usually does negative work.
c. Sam and Rachel worked hard pushing the car.
d. Work is a physical quantity:

Answers

Answer 1

Answer:

Hi... Your answer is B... a is not work because work is ziro


Related Questions

A satellite moves at a constant speed in a circular orbit about the center of the
Earth at an altitude half the radius of the Earth above its surface. if 'g' is the
gravitational acceleration at the surface of the Earth and Rits radius, then what
will be the speed of the satellite?
O V25R
123R/3
133R/2
VOR

Answers

Answer:

[tex]V=\sqrt{\frac{2}{3}gR}[/tex]

Explanation:

Using the gravitational force equation

[tex]F=G\frac{mM}{D^{2}}[/tex]

D is the distance from the center of the earth [tex]D=\frac{R}{2}+R=\frac{3R}{2}[/tex]

Now, we can equal this equation to the centripetal force.

[tex]F_{c}=\frac{mV^{2}}{D}[/tex]

V is the speed of the satellite

[tex]\frac{mV^{2}}{D}=G\frac{mM}{D^{2}}[/tex]

[tex]V^{2}=G\frac{M}{D}[/tex]

[tex]V=\sqrt{G\frac{M}{D}}[/tex]

[tex]V=\sqrt{G\frac{M}{(R*3/2)}}[/tex]

[tex]V=\sqrt{2G\frac{M}{3R}}[/tex]

But if we evaluate the force at the surface of the earth we have:

[tex]F=G\frac{mM}{R^{2}}[/tex]

[tex]mg=G\frac{mM}{R^{2}}[/tex]

[tex]g=G\frac{M}{R^{2}}[/tex]

[tex]gR=G\frac{M}{R}[/tex]

Then we can use this expression into the equation of V

[tex]V=\sqrt{\frac{2}{3}gR}[/tex]

I hope it helps you!    

i need help finding the calculation for the bed forces if diagrams.​

Answers

Ok buddy so what you need help with

How would the cost of operating a 30 watt bulb relate to the cost of operating a 60 watt bulb for a given amount of time?

Answers

Utility companies charge based on consumption in kWh. Range of approximately 3 to 10 cents per kWh (rates vary by locale)

So consumption is directly proportional to watts of the load.

A 30 watt light bulb running for 100 hrs
would cost half of what a 60 watt bulb burning for the same time frame.

30 x 100= 3 KWh

60 x 100= 6 kWh

So use LED lights that give same lumens for much less watts of power

a police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of:

Answers

Answer:

50 feet or more

Explanation:

In order to quickly respond to hazardous situation in a timely manner, it is important to be alert with all senses and there are situations such as while driving , the present of an hazard can only be heard, such as when other cars honk their horns

As such a citation can be issued by a police officer when a vehicle travels through the highway while using a sound amplification system which can be heard at a distance of 50 or more ft. outside the vehicle.

A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.

Reaching one destination safely without any accidents is largely in the hand of the driver. As the auto vehicle can be a most deadly weapon and highway may be the most dangerous place in the world some of the rules is been implemented to ensure the safety of the people on the highways.

With open senses, the driver prevents any accidents. To prevent any accidents and respond within time. Driver must keep open his ears if any other driver is honking their horns.

Thus, A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.

To know more about the sound, follow the link below,

https://brainly.com/question/927975

10. A toy car travels 63 m during 5.1 s at a constant speed. What is the speed of the toy car? Round your answer to the nearest thousandth, if necessary,
Speed -

Answers

Answer:

speed = 12.353 m/s

Explanation:

[tex]speed = \frac{distance}{time} [/tex]

distance = 63 m

time = 5.1 s

substitute the values into the formula

[tex]speed = \frac{63 \: m}{5.1 \: s} [/tex]

speed = 12.353 m/s

newtons law of gravitation is called a universal law, why?​

Answers

Answer:

......................

Explanation:

It is called so because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, as it is applicable universally, it is called as universal law.

It is called a universal law because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, because it is applicable universally, it is called as universal law.

In which three ways does the double-slit experiment support the wave model
of light?
I A. There are darker bands on the screen.
I B. The light bends as it passes through the small opening.
O c. There are bright bands on the screen.
O D. The light reflects off the screen after passing through the slit.

Answers

Answer:

B.

Light rays bends at the sharp edges in YDSE as well as double slit but intensity is much less in double slit exp. .

I hope it will be useful.

A, B, and C are three ways in which the double-slit experiment supports the wave model of light. Therefore, options A, B, and C are correct.

How does the double-slit experiment support the wave theory?

The following conclusions can be drawn from the results of the double-slit interference test: The head of the light that is absorbed by the screen is only a portion of the light wave; the light wave without the head can still result in interference phenomena.

An interference pattern, which consists of a mix of dark and bright bands, may be observed on the sensor screen across from the slits. Young used this interference pattern as proof that light was a wave rather than a particle.

The presence of bright and darker bands and the bending of light when it passes through the small opening are only be explained if the light is a wave. Therefore, options A, B, and C are correct.

Learn more about the double-slit experiment, here:

https://brainly.com/question/28108126

#SPJ5

Given the distance between the crest of one wave and the crest of the next wave, you can determine the?

Answers

answer: wavelength !!
hope this helped :)

An object with a mass of 20 kg is accelerating at a rate of 6 m/s/s. What is the amount of force?​

Answers

Answer:

120 Newtons

Explanation:

m = 20 kg

a = 6 m/s

F = ?

F = m x a

F = 20 x 6

F = 120 Newtons

b. Velocity is both _speed __ and ___. Formula: ___

Answers

Answer: Velocity is both magnitude and direction. Formula: d(distance)/t(total time)

What are some differences you can spot in a periodic table?

Answers

"The position of each element in the table gives important information about its structure, properties, and behavior in chemical reactions. Specifically, an element's position in the periodic table helps you figure out its electron configuration, how the electrons are organized around the nucleus."


A 48kg skateboarder is ready to drop
in to a halfpipe that is 7m high. What
is their potential energy

Answers

Hello, use the formula:

Pe = mgh

Data:

Pe = Potential energy = ¿?

m = Mass = 48 kg

g = Gravity = 9,81 m/s²

h = Height = 7 m

Replacing according our data:

Pe = 48 kg * 9,81 m/s² *  7 m

Resolving:

Pe =3296,16 J

The potential energy of the skateboarder is 3296,16 Joules

what is the displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south​

Answers

The cyclist displacement is 3 miles south

The displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south will be 1 mile in the east direction.

What is the displacement?

A displacement is a vector in engineering and mechanics that has a length equal to the shortest route between a point P's initial and final positions.

The displacement is the vector quantity that depends on the magnitude as well as direction. And follows the law of vector addition.

The cyclist who travels 1 mile north 1 mile east then finally 1 mile south​. Then the diagram is drawn below.

From the graph, the displacement is given as,

Displacement = 1 - 0

Displacement = 1 mile

The displacement of a cyclist who travels 1 mile north 1 mile east then finally 1 mile south will be 1 mile in the east direction.

Learn more about displacement:

https://brainly.com/question/29307794

#SPJ6

HELP ASAP
Write a paragraph describing how a light ray passes through the eye and results in vision.

Answers

Answer:

This can be part of your paragraph.

Explanation:

From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, controls the amount of light passing through. From there, it then hits the lens. This is the clear structure inside the eye that focuses light rays onto the retina.

your hands get warm by a fire because _____energy is converted into heat energy​

Answers

Answer:

Your hands get warm by fire because chemical energy gets converted into heat energy. When the chemical bonds in the wood are released in the air which then mixes with oxygen and emit heat. This is the reason why it is always hot when you go near something that is burning or is up in flames.

Explanation:

Your hands get warm by a fire because chemical energy is converted into heat energy.

cx = -105 m and cy = -88.2 m
find the magnitude and direction of the vector.

Answers

Answer:

See the answers below.

Explanation:

The magnitude can be easily found by means of the Pythagorean theorem.

[tex]C = \sqrt{(C_{x})^{2} +(C_{y})^{2}} \\C=\sqrt{(105)^{2} +(88.2)^{2} } \\C=\sqrt{18804.24}\\C = 137.13 [m][/tex]

We know that the coordinates in x and in y are negative, therefore the vector should be located in the fourth quadrant, see attached image.

And the angle with respect to the horizontal can be determined by means of the tangent of the angle.

[tex]tan(\alpha )=\frac{88.2}{105}\\tan(\alpha ) =0.84\\\alpha =tan^{-1} (0.84)\\\alpha =40[/tex]

These are 40 degrees below the X-positive horizontal axis.

Answer:

137.13

Explanation:

I got it right on Acellus

Consider a girl that has a mass of 55.0 kg and is standing on the floor, how much supporting force does the floor have

Answers

Answer:

Explanation:

m = 55 kg

a = 9.8

F = ?

The first thing you are going to do is find the force that the girl represents.

F = 9.81 * 55

F = 539.55

But that is not the answer. That is her weight. A very important part of this question is to realize that the floor is pushing up on her with an equal force.

Her weight is going DOWN.

The floor is pushing UP with a force of 539.55 Newtons.

Seafloor spreading is a process that occurs along ___________1____________. At ___________2____________ boundary, two plates move away from each other resulting to spreading of seafloor, thereby creating new ___________3____________ crust. Near the mid-oceanic ridge _________4__________ rocks are found and far from it are older.

Answers

Answer:

where is the answer choices

Explanation:


Explain why open pipes are preferred to closed pipe in the production of music-​

Answers

Answer:

The frequencies of sounds made by these two types of instruments are different because of the different ways that air will move at a closed or open end of the pipe. Open pipes do not produce superior tone than closed (or stopped) pipes, therefore different types of pipes are used to produce different tonal qualities.

Explanation:

A truck is traveling at constant speed of t v =21 m/s is at x= (80, 100, 120, 140, 160) m in front of a police car moving with constant speed of p v =25 m/s. What is the time (in s) needs the police to catch the truck?

Answers

Answer:

t= (20, 25, ...  40) s

Explanation:

This is an exercise in kinematics specifically of uniform motion, the first thing we must do is set a reference system, we place our zero in the police car, we write the equations

police car

         x₁ = v₁ t

truck

         x₂ = x₀ + v₂ t

In this case, they indicate several initial positions of the truck and the speed of the two vehicles, at the meeting point the positions must be the same

         x₁ = x₂

        v₁ t = x₀ + v₂ t

        t (v₁ - v₂) = x₀

        t = [tex]\frac{x_{o} }{v_{1}- v_{2} }[/tex]

let's calculate for each initial position

x₀ = 80m

      t = 80 / (25-21)

      t = 80/4

      t = 20 s

x₀ = 100 m

      t = 100/4

      t = 25 s

the last x₀ = 160 m

      t = 160/4

      t = 40 s

we can see that the time increases as the distance between the vehicles increases

A clock which has brass pendulum beats correctly at 30C will it run faster or slower if temperature increase or decrease​

Answers

Answer:

We know that the period of a pendulum is written as:

T = 2*pi*√(L/g)

where:

g = gravitational acceleration = 9.8m/s^2

pi = 3.1415...

L =  length of the pendulum, in this case, is the length of the brass pendulum.

Now, we know that the brass dilates when the temperature increases.

Then if the temperature increases, the value of L will increase, which means that the period T will also increase, because L is in the numerator of T.

If the period increases the complete motion of the pendulum needs more time, this would mean that the clock will run slower.

If the temperature decreases, the opposite occurs, the value of L decreases, and then the period also decreases, which means that the clock will run faster.

1. The mass of an object on the Earth is 100. kg.
a. What is the weight of the object on the Earth?
b. What is the mass of the object on the moon?

Answers

Answer:

980N

100kg

Explanation:

Weight is Mass * Gravity.

For question a, the object with a mass of 100 kg will have a weight of

100 * 9.8 = 980N

For question b, the mass of the object will stay the same, even if it is on the moon. Therefore it is 100kg.

(a). The weight of the object on the Earth is 980 N.

(b). The mass of the object on the moon is 100 kg.

The weight of the object on the earth has been considered to be affected by the Gravitational force as it has been acting on the object.

(a) The weight of the object on Earth can be given by:

Weight = mass [tex]\times[/tex] Gravitational Force

Given, the mass of the object = 100 kg.

The gravitational force = 9.8N

Weight of the object = 100 [tex]\times[/tex] 9.8 N

Weight of the object = 980 N

(b) The mass of the object has been independent of the gravitational force that has been acting on the object.

Thus, the mass of the object on earth = the mass of object on the moon.

The mass of the object on the moon = 100 kg.

For more information about the mass of the object, refer to the link:

https://brainly.com/question/20353971

1. A car with an initial velocity of 5m/s acceaccelerates uniformly at 3 metre per second square until it reaches a velocity of 23 m per second calculate the time taken and the distance travel during this acceleration?

2 . a train starts from rest and moves with a uniform acceleration of x metre per second square for 5 minutes determine the value of x if it covers a distance of 5.8 km during the journey

3. a stone thrown up is caught by the thrower after 6 seconds how high did it go and where was it 4 seconds after start??


Thank you
Please show solvings​

Answers

Explanation:

here, u = 5m/s,a = 3m/s2, v = 23m/s, t = ?, s = ?

v = u+at

23 = 5 + 3t

t = 23- 5/3 = 18/3 = 6 sec

s= ut + 1/2 at ^2

s = 5 * 6 + 1/2 * 3 * (6)^2

s = 30 + 1/2 * 3 * 36

s = 30 + 18 * 3

s= 30 + 54 = 84 m

here, u = 0, a = x, t = 5min = 300 sec, s= 5.8km = 5800m

s = ut + 1/2 at^2

5800 = 0 * 300 + 1/2 * x * (300)^2

5800 = 1/2 * x * 90000

5800= 45000 x

x = 5800/45000

x = 0.12m/sec^2

here, v = 0, t = 6sec, s = ?, a = - 9.8m/s2

s = UT + 1/2 at ^2

s = 29.4 * 3 + 1/2 * - 9.8 * (3)^2

s= 88.2 - 44.1

s= 44.1 m

s = ut + 1/2 at ^2

s = 0 * 1 + 1*2 * 9.8 * (1)^2

s = 4.9m

hope it helps you

What is the kinetic energy of a golf ball with a mass of 0.046 kg traveling at 15.5
m/s?

Answers

Answer:

5.53 J

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575[/tex]

We have the final answer as

5.53 J

Hope this helps you

12. Which of the following is the best example of an
organism maintaining homeostasis?
A.
a wolf panting after a chase
B.
a spider catching an insect in a web
C.
a cricket becoming infected by a virus
D.
a mole digging tunnels in the ground

Answers

Answer:

I would say A.

Explanation:

Homeostasis is pretty much a state of rest or equilibrium. Only A counts, as that wolf is trying to catch its breath and lower its breathing rate and heart rate.

(I could be wrong if B counts. Ya know, if the spider needs to stop being hungry?)

A person investing p at a certain rate of simpl interest after 1 2 and3 years it amounted to 1.5 p 2.5 p respectively what will it amount to at the end of 20 years

Answers

Answer: It will amount to 11p after 20 years.

Explanation:

Formula :

Simple interest = Principal x rate x Time              (i)

Amount = Principal + Interest

Amount = Principal +   Principal x rate x Time

Amount =  Principal (1+  rate x Time)                       (ii)

Given: Principal = p

After 1 year , amount = 1.5p

After 3 years , amount = 2.5p

From (ii)

[tex]1.5p = p (1+r)\\\\\Rightarrow\ 1.5=1+r\\\\\Rightarrow\ 0.5= r\\\\\Rightarrow r= 0.5[/tex]

Amount after 20 years = p(1+ 0.5 x 20) = p(1+10)=11p

It will amount to 11p after 20 years.

What is meant by the “right to redress”?

Answers

Answer:it can be putting right a wrong by compensation or compensation for injuries sustained; recovery or restitution for harm or injury; damages or equitable relief. Right to redress refers to the right to a relief or remedy.The right of redress is a capability that anyone should be able to exercise if they consider they are not being treated in ways that are congruent with their status as an individual person worthy of respect.

Explanation: I hope this helps I tried my best<33

Answer:

d.

The consumer has the right to fair settlement of disputes

Explanation:

The density of sulfur is 2g/cm3. A large block of pure sulfur was broken into two smaller pieces. The density of each piece of sulfur is now 1 g/cm3.

True or false

Answers

Answer:

False

Explanation:

Density is an intensive property of a substance. Intensive properties are those properties that are characteristic of a substance. They do not depend on the amount of substance present.

Since density is an intensive property, each piece of sulphur still has a density of 2g/cm3.

what is rectilinear propagation of light ?​

Answers

Answer:

light travels in straight line

Rectilinear propagation of light is the property of light due to which it travels in a straight line.

Foe example; Torch light

Hope it helps!

A 0.125 kg hockey puck moving at 20.0 m/s is caught and held by an 85.0 kg goalkeeper at rest. After catching the puck, with what velocity does the goalkeeper slide across the ice?
A.
0.0351 m/s

B.
0.0294 m/s

C.
0.0320 m/s

D.
0.0263 m/s

Answers

Answer:

a

Explanation:cuz i saiad so

Other Questions
Which sentence does the subject agree with the verb? Those classes joins the team every year.Mrs. Smith like her students to participate.She encourage her entire class to sign up for an event.They always win a ribbon for best student participation. Evaluate the expression 9b6b3b for b=7. The first company charges $3.50 per cubic foot of rock and $80 for delivery. The second company charges $2.50 per cubic foot of rock and $120 for delivery. Which system of equations can be used to determine the value of the width, x, at which the cost of the two companies, y, is the same? The day of the audition, Lily woke up early and walked downstairs to join her mother and Kip in the kitchen. She sat down to a healthy breakfast and Kip asked her, "So, are you nervous for today?" "Not really, Kip," she said. "It is really no big deal because I have auditioned a million other times," she said, swallowing the truth that she was, in fact, terrified. How does the author's inclusion of this excerpt contribute to the text? A piano teacher gives lessons that are each Three-fourths hour long. How many piano lessons can the teacher fit into a 12-hour work day? Assume no breaks are taken in the 12 hour period. Emma decides to go on a two week fasting in which , she will not eat anything until around 3 pm everyday.Will this practice make Emma to loose some weight ?If yes , explain . Cell phone Plan B costs $50 per month but does not come with a phone. If you choose this plan, you will need to purchase a phone for $500. Let x = the number of months and y = the total cost of the cell phone plan. Write an equation to represent the cost of Cell phone Plan B. * Which statement about spreading knowledge of diseases and health around the world is correct? (Edgeduity)It is needed to educate medical professionals of the need for their help.It is a way international organizations are helping to fight disease.It is an ineffective way to help fight disease since it takes too long.It is the most effective way to help fight disease in the world. PLEASE ANSWER FOR 15 BRAINLY POINTS!! I AM TIMED!!Which of the following is the most likely reason for the end of Chinese exploration? (4 points) aMuslim invasion bReligious conflicts cTo save money dWar with India susan said to her mother, "i ll be back home before eleven change the indirect speech Question 17 of 25Which is the graph of the following inequality?1x1 who wants brainlest?what is 5 + 5(hardest question in the galaxy)what is the name of that oger in shrek?(very hard)what is the name of the most popular web browser?hint: not internet explorer(starts with a g)bonus question:(heart)who is the 2nd most popular robl0x yt channel(pls sub to him)and pewdsif you want to compete in the next brainlest competition, you could friend me or, follow my questions to keep yourself updated........... Would a graph with a slope of 0 and a y intercept of 4 be proportional or not proportional? What is the author's opinion about the school hours from 8:00 to 10:00 a.m.? Roman farmers and other commoners were called:A. plebeians.B. patricians.C. equites.D. citizens. Please help me! I really need this, it could determine whether I fail or not.So I have this essay that's due in two days, all I want is a good rough draft of it. It's about "Public Schools vs Private Schools". I will give BRAINLIEST to the person who helped the most.I already made a rough draft to help but it isn't that good- Private School vs Public School A lot of people wonder, is private school better than public school?Most public schools are paid for by local taxes. Private schools can range from anywhere from $7,000 to $25,180 per year. This is a lot of money but because they spend more money, private schools give students more opportunities and can really benefit in the long run.I believe private schools are a better choice than public schools because private school students have better test scores, classes are more focused on the students goals, and private schools have a better diversity than public schools. A recent recap of high school graduates showed private school students scoring 3.1 points higher on the ACT test. Another comparison on math tests showed that private school students scored on average 18 points higher for eighth grade, and only 8 points higher for fourth grade. This supports my opinion because it talks about how the average private school student can score higher than a public school student which looks very good on a college application. Private school are not under state supervision, that means that private schools can offer curriculums that are more of the students focus. For students that want to study art or theater private school is more recommended. As the article states Due to ever-changing budgets and mandated testing, public schools are more focused on the core classes, often at the expense of more peripheral subjects. If a student wanted to become someone in the entertainment business then they would prefer private school because thats where they can focus more on theater production than public schools. From the article, it states that Numerous studies have shown that private schools, on the whole, offer a more positive peer environment. The students have a better understanding of the topic because they can have one on one peer help. Because the classes are smaller than the average public school classroom the students can better benefit and learn better with their peers. In conclusion, I think private school is better than public because it can offer smaller class sizes, more individual attention, and a better understanding of how each student prefers to learn.Yeah I know this is a lot, but please, I'm begging you, please help. Pam is making a border around her garden. She buys 9 bricks for her border. The bricks weigh 27 kilograms in all. 7. What effects did the death of Cochise have on the agreement made between the Chiricahua peopleand the United States Government?A. His death had no effect on the agreement between the Chiricahua people and the UnitedStates governmentB. It allowed the United States government to nullify the agreement made with the Chiricahualeader.C. It allowed the United States government to form an alliance with the Miexican governmentagainst the Chiracahua peopleD. The United States government then had to negotiate with the new Chiracahua leader,Geronimo The temperature on the moon vary from -173*C to 127C find the difference between the maximum and minimum temperatures Mrs. Storz can ride her bike 6000 meters in 15 minutes. How far can she ride in 2 minutes? Steam Workshop Downloader