Lucina

This page lists questions and answers that were posted by visitors named Lucina.

Questions

The following questions were asked by visitors named Lucina.

Hello! A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg. Ek= 1/2mv^2 Ek= 1/2(357)(33m/s)^2 Ek= 194386.5 J The problem is that my answer key has the answer 208kJ. What's my error? I have tried this...

Hi! Would one of you please check my work? Thanks! ( I used significant digits, by the way) A student throws a 5.00 kg steel shot directly upwards so that it leaves his hand when it is 2.00 m above the ground. If its velocity is 0.15 m/s when it leaves hi...

1) On the construction site an electric crane is used to lift materials to the 10th floor. A 180 kW motor requires 2.0 minutes to lift a 10500 kg load if bricks 218 m. How efficient is the crane? 2. Burning 1.0 kg of coal releases 33 MJ of energy. This en...

The Great Galaxy in Andromeda is about 2200000 light years from Earth. Light travels 5900000000000 miles in a year. How many miles is the Great Galaxy in Andromeda from Earth? I got 1.298* 10^20 miles. (This is the exponents unit)

(I skipped the lengthy work problem background as it is irrelevant) The number of bacteria needed to break down an oil spill is 1000000 per millitre of oil. The bacteria double in number every two days.The starting concentration of bacteria is 1000 bacter...

A fallen tree if lifted 2.75m.What is the work done? W=Fd

Hi! I have a few tests coming up and I need some practice Physics worksheet/tests. I have already done the worksheets and previous tests, but I still need more practice. Does anyone know a site that I can get some practise problems? Doing a google search...

What is the difference between scalar and vector quantities and what two methods are used to describe vectors? Answer: Scalar quantities measure only distance (speed) while vector quantities measure both distance and direction, ( which is specifically kno...

What is the purpose of Lord Capulet arranging Juliet's marriage to Paris so suddenly after Tybalt's death? It is obviously to speed up the action in the play and give Friar Lawrence and Juliet to find some way to bring Romeo back to Verona, however, is th...

Are these sentences correct? Il travaille sur mardi Ils dessinent un maison Elles travaillent mecredi Elles commencent les devoirs. Nous arrivons nous maison Ils arrivent nous maison Tu es aides moi. Merci!

The circular area of the drum is (9x^2+30x+25)pi. What is the smallest diameter it can have? (9x^2+30x+25) (3x+15) (3x+15) 3(x+5) 3(x+5) 9(x+5) 9x+45 <--------

State whether the following equations are sometimes, always or never true. a) a^2-2ab-b^2= (a-b)^2, bis not equal to 0 b) a^2+ b^2= (a+b)(a+b) c) a^2-b^2= a^2-2ab+b^2 d) (a=b)^2 = a^2+2ab+b^2 I don't understand what these questions are exactly asking. Cou...

Find the radius of a cylinder with a volume of 393.3 cm^3 and a height of 3cm V = pi*r^2*h 393.3 = pi*r^2*h 41.75 cm = r^2 6.5 cm = r <-------------

Are SI measurements always larger than Imperial measurements?

A hand drum has a diameter of 14 7/8 inches and is 3 in deep. What is the amount of hide needed if the hide only covers top and lateral faces? *what are lateral faces? Thanks!

I realize I'll get a reply in the morning so... A squash ball must have a diameter either 0.5 mm either above or below 40 mm. a) What is the minimum and maximum surface area of a squash ball? Express answer to nearest square millimetre. Minimum: 4902 Maxi...

In a marathon race, one runner is moving at 5.0 m/s passes a second runner moving at 4.5. What is the distance between the runners 10 minutes after the one runner has passed the other? 5m?

( I have to do either a creative or personal response to a visual. I have chosen to do a personal response in the form of an essay. Obviously, I can't show the visual but I can describe it: A man in a swimsuit is jumping out of rough cliffs ( not in focus...

If I have an 85% in a course, what mark would I need to raise to an 89+ if my final is worth 25% of the whole course?

Hello, I am practicing personal responses to text, the poem I'm responding is called "When I was one-and twenty" by A.E.Housen. The question I must discuss is : " How does the text suggest that are choices affect the person we become?" I know some of the...

Bonjour! Are the following examples les adjectifs de nationalite? 1. en + pays feminin --> Exemple: en Chine 2. au + pay masculin --> Exemple: au Canada 3. aux -> aux Etats-Unis (Used for territories/provinces/states if I am correct...) 4. a + ville --> a...

Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!

Hello! Explain why the primary trigonometric ratios depend only on the given angle and not the size of legs and hypotenuse of a right triangle? I am not 100% sure but it is because the angles have the same value for all of the ratios? Is it also because t...

A old Chevy accelerates at a rate of 3.8 m/s^2. How much time would it take to reach the speed limit of 100 km if the car was travelling at the speed of 70.0 km? a) 2.9 s b) 3.7 s <---- c) 5.4 s d) 30.0 s 2. Find the acceleration of a skier sliding down a...

A 50 g lunch pail is lifted up 500 m. If the work required to do this was 1450 J, what's the acceleration? W= mad 1450 = (0.05 kg)(a)(500m) 1450 = 250a 5.8 m/s^2 = a If a 750 g mass is accelerated at a rate of 11.0 m/s^2 for a distance of 3.0 m, how much...

Determine the missing value. a) Output value/Efficiency: 100 J Efficiency: 100% Input E = ??? b) Input: 100 J Efficiency: 30% Output E = ?? Output= 30 J c) Output E: 120 000 J Efficiency: 2% Input E= ?? How would I solve for the put value? Thank you!

Is xylem or phloem larger in a plant? My answer is xylem is larger in a plant than phloem.

Negating air resistance, a block weighing 1.0 kg will fall _________ a 3.0 kg block Answer: The same rate as

Write the simplified form of the expression. {q^-2/3} {q^1/3} --------------- q^4/3 Using positive exponents. ------------------------------------- Solution: {q^-2/3} {q^1/3} = q^-1/3 = 1 --------------- ------ ---- q^4/3 q^4/3 q^5 Thanks in advance

What is the domain and range of the relation y = 2(x-5)^2 + 8? Express in set notation. --------------------------------------- Domain: x E R Range : y E R --------------------------------------- Thanks!

Bonjour! 1. Can you tell me if I wrote this in passé compose correctly? I'd also appreciate an explain as to when you should use avoir / étre! a) Je suis bois de l'eau b) It est mange un pizza. c) J'ai visité ma mere. 2. Have I written this in futur proch...

Solve this system of linear equations. * Used the substitution method 3x - y = 8 4x - y = -15 ----------------------------------------- WORK y = 3x - 8 4x - (3x - 8 ) = -15 4x - 3x + 8 = -15 x + 8 = -15 x = -7 3x - y = 8 3(-7) - y = 8 -21 - y = 8 -y = 29...

* Note to Sra: I saw your replies to my previous post. They were very useful! I am posting a new question as the questions are a different topic.* Can you please check if I have written these sentences correctly in the affirmative form? I believe that aff...

Factor 3x^3 + 9x^2 - 3x - 9 3x^3 + 9x^2 - 3x - 9 3 (x^3 + 3x^2- x - 3) 3 ( x+3x^2) ( -x - 3) 3 {x( 1 + 3x) -1 (x -1) This is a far I have gotten. Can someone please help me through the rest of the answer? Thank You

Does anyone know a website or a book where I have some General Cognitive Ability Tests/ Standardized Exams for free? The sites I found are not what I was looking or were asking me to pay.

Are these two the same? Which one of those is the correct form? Sn = n ---[3n-1] 2 Sn = 3n^2 +n ------- 2

In to Kill A Mockingbird, what happened to Dill's father? At the beginning Dill mentions he didn't have a father but when Scout pressures him he says his father is not dead. Later, he mentions his father owning the railway ( a story that he made up?). I d...

Hello, Consider a geometric sequence with t3= 18 and t7= 1458. Are there one or two values for the common ratio? How does this affect the sequence (I got one, but the way this question mentions 2 ratios, I get the feeling there are 2 values.) My work: 145...

Each second after shut-off, the speed of the blade is 2/3 of the speed in the previous second. After the first 8 s, the saw has turned 258 times. What was the speed of the saw before the motor shut off, to the nearest tenth of a turn per second? I get 805...

If r = 1, will a sequence be convergent or divergent?

Can someone please explain to me what was John Dalton's experiment that led to his atomic theory? I know it's the electrolysis of water, but I'd appreciate if someone could explain in detail.

Are halogens and non-metals metal or non-metals? I think they're both non-metals

Q.Determine the sum of each infinite geometric series. t_1= 8 r = -2^1/2 ---------------------------------------- A.This is a divergent series because the absolute value of r is greater than 1. ---------------------------------------- Q. The first term of...

Find the first two terms of a geometric sequence if t_3+ t_4 = 50 and t_4 + t_5 =100? t3= a(r^2) t4= a(r^3) t5= a(r^4) a(r^2)+ a(r^4)= 100 ------------------------- a(r^3)+ a(r^4) = 50 ar^3 ----- = 2 ar^2 r = 2 <-------

An angle in standard position such that sinÈ = 5/13. Determine the possible values of È, to the nearest degree. Answer: I got 23°. (How do I get the second one?)

The point P(k, 24) is 25 units from the origin. If P lies on the terminal arm of an angle, theta, in standard position, 0 < theta < 360,determine the measure of theta. Unsure how to go on from here. I'd appreciate if someone can guide me through the first...

An 8-m boom is used to move a bundle of piping from point A to point B. Determine the exact vertical displacement of the of the boom when the operator moves it form 30 degrees to 60 degrees. (Just need work checked) ---------------------------------------...

The rotating spotlight from the Coast Guard ship can illuminate up to a distance of 250 m. An observer on the shore is 500 m from the ship. HIs line of sight to the ship makes an angle of 20 degrees with the shoreline. What length of shoreline is illumina...

The Bermuda Triangle is an unmarked area in the Atlantic Ocean where there have been reports of unexplained disappearances of boats and planes and problems with radio communications. The triangle is an isosceles triangle with vertices at Miami, Florida, S...

What does N70 degrees E mean? Thank you

Three oil platforms, Alpha, Beta and Gamma are situated in the North Sea.Beta is 12 km from Alpha and is on a bearing of 145 degrees from Alpha.Gamma is 16 km from Alpha and is on a bearing of 220 degrees from Alpha.Find the distance of Beta from Gamma. (...

Water is spraying from a nozzle in a fountain forming a parabolic path. The nozzle is 10 cm above the service of the water. The water achieves a max height of 100 cm above the waters surface and lands in the pool. The water spray is again 10 cm above the...

Determine a quadratic function in vertex form given each set of characteristics. * minimum value of -24 and x-intercepts at -21 and -5 I have: (-21,0) and (-5,0) How would I find the x-coordinate of the vertex? (Thank you)

There are 3 airports, A , E and G. G is 200km from A.E is 160 km from A From G the bearing of A is 052 degrees. From A the bearing of E is 216 degrees. What's the distance between A and G? 360- 216 = 144 144-52 = 128 144-128 = 16 a^2 = b^2+c^2-(2*b*c)*cos...

One walker was sponsored $100 plus $5 for the first kilometre, $10 for the second kilometre, $15 for the third kilometre, and so on. How far would this walker need to walk to earn $150? (I know it is 4 km, but I can't figure out how to write the general t...

How many parameters in a quadratic function in a vertex form change when you change the location of the vertex? ( P and Q change? The value of the coefficient( a ) may also change?)

1. A projectile is fired straight up from a height of 6 feet. Its height (h) in feet after t seconds is given by h = 6 + 192t -16t^2. Answer: h = -16t^2 + 192t + 6 h = -16( t^2 -12t +36) + 6 +576 h = -16 (t-6)^2 +582 The maximum height will be 582 feet. 2...

Determine a quadratic function with this set of characteristics. x-intercepts of 2 and 7 and maximum value of 25 ( How would I find the x-coordinate for the vertex?) (Thank you!)

Rewrite each quadratic equation in the form ax^2+bx+c=0. Then,use technology to solve each by graphing. ROund you answers to the nearest hundredth, where necessary. a) 3x^2+30 = -19x Answer: 3x^2+19x+30 Roots: x = -3 b) 6x^2= 25x-24 Answer: -6x^2+25x-24=0...

Hello! I have to write an essay a critical paragraph/essay tommorrow on the following topic: In the first half of the novel, the author uses the idea of gender identity and societal expectations. In what way does the author use the character of Scout to c...

Solve. Express your answer as exact roots. (s+6)^2 = 3/4 Sq root (s+6)^2 = +-sq root 3/4 (s+6) = sq root 3/ 2 s = -6 +- sq root 3 ----------------- 2 (The answer according to the textbook is (-12 +- sq root 3)/2. What error have I made?) Thank you

Solve 0 = 3x^2 + 5x -1 by completing the square. Express your answer as exact roots. 3(x^2 + 5/3 + 25/36) = -1 (x+ 5/6)^2 = 37/36 sq root( x + 5/6)^2 = sq root (37/36) x + 5/6 = +- sq root 37/6 x = -5/6 +- square root 37 /6 <--- (Sorry for the work being...

Convert from standard to vertex form: (x+5)(x+4) x^2+ 9x + 20 (x+3)^2 + 20 - 9 (x+3)^2 + 11 <------

Can someone please help me with this problem.. I don't get it! Solve (sqrt 5r - 9)-3 = sqrt(r+4)-2

Have I converted correctly from standard form to vertex form? y = -3x^2 + 12x+1 = y = -3(x-2)^2 -13 Thanks

The equation H(t) = 30 + 24t - 6t^2 describes the height of a ball at any time t. What's the height of the ball after two seconds h = 30 + 24(2) + 6(2)^2 h = 30 + 48 -24 h = 54 units Therefore, the maximum height is 54 units

Please tell me what I'm doing wrong... The side lengths of tops of three squares tables can be described as three consecutive integers. The combined area of the table tops is 677 sq in. Algebraically, determine the roots of the quadratic equation. (I'll u...

A sailboat in a lake travels 4 km due north and then 4 km due west. From there, the boat travels 5 km due north and 4 km due west. How far is the bboat from the starting point? Express your answer as a mixed radical. (How would I use radicals for this??)...

Can someone please check if I have written and balanced the reaction properly? 1.In 1774 Joesph Priestley discovered oxygen by decomposing the oxide of mercury. 2HgO = 2 Hg + O2 2. Slaked lime precipitates magnesium ions from hard water. Ca(OH)2 + Mg(HCO3...

Can the following be reduced any further? 14x^2/56y^3 I did not reduce because there were different variables in the numerator and denominator. Thanks

Simplify the rational expression and then add or subtract. Express answers in simplest form and identify all non-permissible values. (The non-permissible value is not the issue. It is the simplification) 3x + 15/x^2-25 + 4x^2 -1/ 2x^2 + 9x -5 3(x+5)/(x+5)...

Two hoses together fill a pool in 2 h. If only hose A is used, the pool fills in 3 h. How long would it take to fill the pool if only hose B were used? I multiplied 3 and 2 and got 6 hours. Is this a valid method? Thanks

Evaluate. 1-|200+||-2|(-5)^3|| I get 49 as an answer

Remplacez les tirets par le, la , l' ou les 1. Georges? Il LE aime beaucoup 2. Les oeuf frais? On LES vend au marche 3. Mes grands-parents? Je LE visite ce week-end 4. Sa maison? Il LE loue 5. L'argent ? Je le depense facilement 6. Les disques classiques?...

In the novel, To Kill a Mockingbird by Harper Lee, a major character, Jem's view on the world shifts drastically due to his experiences with his hometown Does this sentence sound awkward? If so, how can I make this sentence flow more smoothly? Thank you

Why does |7 + 3x| = x -1 have no solution? I could plug in, for example 5, and the answer would be positive. Thank you =)

I want to find the invariant points( points that are fixed) algrebraically of x^2 - 25 and its reciprocal. Would I set up my equation like this? 0 = x^2 -25 or 0 = 1/ x^2 - 25 Thanks

Bonjour! Have I written the following sentences correctly? 1. J'adore le pasta. Je le mangeions chaque semaine ( I like pasta. I eat it every week) 2. J'aime lire le livre. Je le lisais chaque jour ( I like to read. I read everyday) 3. Je déteste les liza...

Bonjour Sra! I was unable to reply to your answer over the past few days. I finally had the chance to check this out today. I had initially used your suggestions but when my teacher read it she told me since my actions were habits, I should use the infini...

Hello! Does Jiskha have Earth Science tutors? If not, could someone direct me to a site where I could ask for help? My questions regard finding out specific heat capacity and heat of fusion and heat of vapourization of water. Thank you!

Bonjour! Are these sentences grammatically correct? 1. J’étais trés réservée. C’était une bonne chose, parce que je n’ai jamais eu des problémes pour parler. Mais il était difficile de se faire des amis (I was very quiet. It was good thing, since I never...

Hello! For critical essays analyzing literature, is it better to analyze one text or can it done with more than one text? Thank you!

What is the average velocity of a dropped brick that falls 4.0 m? vi = 4.0 m/s vf = 0 m/s a = 9.81 m/s^2 t = vf-vi / a t = -4/9.81 t = 0.41 s v = d/t v = 4.0/0.41 v = 9.81 m/s^2 <----------

Hello! I am having trouble figuring out the answer for this question: A 60 kg water skier is being pulled behind a boat. If the propulsive force applied by the 500 kg boat is 2.50 * 10^3 N, determine the acceleration of the skier and tension force in the...

Canadian geese move up and down on the surface of a lake. If one moves up and down 15 times a minute and you estimate the distance between the wave crests to be 1 m, determine the speed of the water F = rpm F = 15/60 F = .25 V = wavelength * Frequency v =...

According to this quote, what was the main objective of the South during the specified time period?

1. What was one impact of the Iranian Revolution on the United States? (1 point) higher oil prices increased terrorism increased taxes increased military spending “Government is not the solution to our problems, government is the problem” --Ronald Reagan,...

Answers

The following answers were posted by visitors named Lucina.

Try writing an equation.

Sorry. We need a constant, coefficient and a variable. The constant is the number that stays the same so this will be 2.50. The variable is n. This represents the minutes (or whatever letter you like) The coefficient is 0.24 because each minute costs me 2...

I found the answer on Google by typing in the exact same question as yours. Did you try that?

Hmmm... The worksheets lists both 0.15 and 15 as velocity (?)Perhaps they forgot to put the decimal. Will I not get a different answer if the velocity is different, like you suggested? Thanks!

Converting 2x-3y=-3 into slope intercept form gives us: y= -2/3x+1 This means that these two lines are the same, so this means they are neither parallel or perpendicular

Your welcome :)

Thanks you Henry! I still would like to know if 2 and 4 are correct, thank you!

What did you get for this question? I can check your answer

What standard form are you supposed to use? Ax+By=C or Ax+By+C=0?

Hm, not quite! Have you tried substituting?

Good work! That's correct

You are looking at how many movies she needs to rent using Plan B that will have her spend less money than Plan A

Thanks! I will have to ask my teacher about the low velocity bit..

I got 12.88% for the efficiency if I used 27 m for the height. If I use 218 for the height I got 96.1% I understand how you did 2 but I have doubts about my answer for 3 I got 1.95% for efficiency...

Does the heat capacity vary? My book said it is 4181 J

Thanks! Calculation error on my part.

O.o We haven't even come close to logarithms. What grade level is this?

This was one of the advanced problems in my textbook. I think the author intended to solve the problem using the second method. Thank you,once again for helping me!

So this question cannot be solved?

Divide 83.9 by 100 Multiply 0.038 by 100

Change 12/5 to an equivalent fraction 12/5 * 4 = 48/5 48/5 - 17/5 = ???

Merci! Would you please check if I translated this correctly? Je vous appelle parce que suite a l'absence de mon enfant Isabella dans le 18 janvier Isabella s'est casse le pied. Elle ne marche plus et elle est dans la douleur-elle pleure beaucoup. I want...

Maybe dipali is looking if the sentence is grammatically correct? If so, then it's not correct. It's "Raj and Ravi are interested in watching a movie."

I'm pretty sure you meant math, not physics. Anyways, to solve this problem use the Pythagorean Theorem. a^2+b^2=c^2 c^2-b^2=a^2 35^2-23^2= a^2 1225-529= 694 The answer is the square root of 694.

Thank you! Could you explain what you meant by " le with the day of the week = on"?

Thank you! I did use the pi button on my calculator but I must have rounded wrong. The question said to round to nearest tenth, so our answers are both same (though I got mine by error...)

Colonists from what country/colony?

Thank you Sra =)

Thank you Reed :) I really appreciate you feedback

1/2 = 4/8 1= 8/8 Vehicles that are cars or motorcycles: 4/8 + 1/8 = 5/8 Vehicles that are not cars or motorcycles: 8/8-5/8 = ??

All three of the above are correct

1 m = 100 cm So she'll cut 100 centimetres to get 1 m.

Good Duke, there is no need to spend this much money!” The Baroness exclaims as I proceed to but the Baroness another brooch exported from Asia. “My dear Baroness, money is hardly a problem! No amount of money is too much for you,” I reply, hoping the Bar...

If this violates the site's policy in any way, please give me a warning and delete it :O

It really is a matter of perspective but in this case you are correct.

1. I have a PC with Windows Could you explain the 3rd rule? The one with dans? Merci!

Thank you, the chart works :) I have a question about the countries that are exempt from the 3 rules you mentioned above: 1. Le Belize 2. Le Cambodge 3. Le Mexique 4. Le Mozambique 5. Le Zaire ( It doesn't exist anymore) 6. Le Zimbabwe Since these countri...

Aww.. :( Oh well, I'll be happy with an 88! Thanks Henry :)

Okay! Thanks for your help Sra! Jishka is really the only place I can get help for my midterm next week as my teacher will be hard to find next week! If I have other questions ( probably sure I will) shall I post them here or post them on a new thread?

What do you need to investigate?

Thank you! Many students told me it was a dull and difficult course! (Probably because they tried to memorize concepts instead of understanding it like you said.) Now when I look at your answer, I think I can survive chemistry! :D

Thank you Devron :)

We had this discussion in class once. Our teacher told us it would end up being worse for Canada as U.S is our main trading partner. U.S would decrease trade as they'd find our price for goods to high. So it would affect is negatively as we are not export...

Oh sorry, I thought you said Canadian dollar vs American dollar.

Sorry! The speed is 110 km/h! So sorry! D:

I am not sure about the first question. The second question is correct.

Hundredth value.

Can you please explain this? I don't quite understand it. from your x + 8 = -15 x = -15-8 x = -23 Thanks!

:O Thanks Sra! You explain French much better than my teacher! The House of être was so useful! :D

You do both addition and multiplication. Let's start with the sets of aunt and uncles. There are going to be 2 people in each set. One person being the aunt, the other is the uncle. To find the total number of aunts and uncles we multiply by 2. So.... 2x8...

That's not correct.

Why not try the question another time? Look at each of the options carefully.

What two numbers when add up gives up 11 and when multiplied give us -42? Let's try 14 and -3 p^2+ 14p - 3p - 42 p( p + 14) -3 ( p + 14) ( p - 3) ( p + 14) <--- Factors!!!

Thank you SO much Sra :D

Robert Hooke was the person who coined the word "cell."

They can make money through tourism - if it's a particularly scenic lake. They can also make money if there are fish present in the lake. People can be charged for fishing in the lake or the people of the community can fish for a living.

Your Welcome :)

$50 * 0.3 = 15 $50 - $15 = ????

I think you meant W = Fd or W = mad W = Force ( Newtons) * distance (km) W = Mass (kg)*acceleration (m/s^2)* distance (km)

Thank You! I never knew you could get some practice exams from universities :O

Sorry, in the first expression, only the n outside the parenthesis is being divided by 2 The entire second expression is being divided by 2.

Khanacademy has a great trigonometry tutorial. Have you tried watching some of the videos on there?

Could you be specific about the experiment?

You are correct! :)

It means 10 ft.

Sorry for the late reply! Not 100% sure but I believe so. If I am wrong, please do post back and tell me the right answer ( but I hope we're both right =) )

Yes, you are correct :)

One parent must have the dominant trait for dimples.

Thanks Steve, turns out my calculator is a bit sensitive..