Questions Asked on
February 26, 2017

Science
Air is compressed until a small piece of cotton is ignited. From a standpoint of thermodynamics what is Happening at a molecular level? Energy cant be created of destroyed?
asked by Boberto 
math
two buses start from the same bus stand at 8am . one travels at 40km/h and the other at 50km/h . the second bus reaches the next stop at 10am. how much later will the first bus arrive?
asked by priya 
Math
A: The variables x and y vary directly. When x is 3, y is 6. Find x when y = 2/3. B: The force acting on an object varies directly with its acceleration. A force of 25 newtons accelerates an object at 1.25 m/s. What is the acceleration of a 35 newton
asked by Anonymous 
Psychology
Which of the following scenarios is the best example of positive reinforcement? A. Maria now buys a different brand of cigarettes to get two packs for the price of one. B. Nate no longer arrives late at work following a reprimand from his boss. C. Drake no
asked by Muhammad 
Psychology
Which of the following scenarios is the best example of negative reinforcement? a. Vanna fastens her seatbelt as soon as she gets in her car to stop the annoying alert sound. b. Drake no longer cuts class now that his parents confiscated his iPod. c. Maria
asked by Muhammad 
Math
Sharon, tracy and Rachel collected a total of 283 stickers. At first, sharon had 1/8 as many stickers as Tracy. When rachel gave 25 of her stickers to sharon, sharon had 1/4 as many stickers as tracy. How many stickers did rachel collect at first?
asked by vick 
CHEMISTRY
Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.22 × 10–4 g Na2CO3 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts
asked by Hannah 
calculus
How would you determine the power series of 1/(1x)^3. I know that the series of 1/(1x) is x^n, but how would you manipulate it for this scenario?
asked by richard 
math
a typist can type 70 words in 1 minute. then how many words can he type in 1.5 minutes?
asked by Anonymous 
calculus
How would you use series to evaluate the lim(x>0) of (xarctanx)/x^3? I'm getting stuck, and the answer says it's 1/3 but I don't know how they got there.
asked by richard 
Physics
An 80g particle moving with an initial velocity of (50m/s)î strikes and sticks to a 60g particle moving at (50m/s)j. How much kinetic energy is lost in this collision?
asked by Gorg 
maths
construct PQR where angle P is 60 and angle q is 50 and PQ is 5.5 cm.
asked by Vanshita 
Operations..pls help..
Explain what is meant by"operations"in (a) hospital (b)university and (c)Commercial bank.
asked by Ibra 
GEOGRAPHY
If the time at town A(LONGITUDE 75"W)is 5pm on friday.What will be the time and day at town B(LONGITUDE 120"E)
asked by OLIVIA 
Maths
Two cubes of edge 2cm each are placed side to sideto form a cuboid. Draw an oblique sketch for the resulting figure.
asked by Khushi 
Math
Hello. I'm not a native English speaker. I have a math assignment and I need to explain the process of this equation. y=14.2x+19.3 542 = 14.2x+19.3 54219.3 = 14.2x 522.7 = 14.2x x = 36.8… I don't know how to explain this in English, can anyone please
asked by apple 
Maths
A painting 40 cm long and 28 cm wide is painted on a cardboard such that there is a margin of 2 cm along each of its sides find total area of margin
asked by Mohanish 
physics
A ball is thrown upward with velocity 5m/s calculate total distance covered by it ?{ Using formulae (v)2 (u)2. =2gs}
asked by Mohasin wani 
Math
a recipe for a banana oats muffins calls for 1/2 cup of old fashioned oats. you are making 3/4 of the recipe. how many cups of oats should you use?
asked by Qui 
CET exam
a bag contains 5 golden and 7 blue balls one ball is drawn it is found to be golden after noting the colour of the ball it is not put back in to the bag another ball is now drawn at random what is the probability that the second ball is drawn is golden
asked by harisha 
value
A man goes 30km due north and then 40km due east. how far away is he away from his initial position?
asked by value 
maths
The sum of square of a positive number and square of its reciprocal is 7.Find the number
asked by Anjali 
math
The sum of the interior angels of a regular polygon 1800.calculate the size of one exterior angel of the polygon
asked by Abaskisszy 
Creating HighQuality Centers
Which of the following statements concerning infants and music is true? A. Babies aren't instinctive music makers; instead, they need to be taught to create and respond to music. B. Lullabies are found only in cultures originating in Europe, so they might
asked by Priscila 
English thesis statements
I am writing a synthesis essay over multiple different sources. I have started writing my essay about how unhealthy relationships are often hard to spot and about how we often tell ourselves everything is fine and make up a vision in our heads of what we
asked by Morgan 
EMpirical and Molecular Formula
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% H, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?
asked by Yo 
maths
In a parallelogram ABCD, sum of two angles is 140 degree then find the measures of its acute angles
asked by nisha 
Math
A rectangular prism has a length of 20 in., a width of 2 in., and a height of 3 1/4 in. The prism is filled with cubes that have edge lengths of 1/4 in. How many cubes are needed to fill the rectangular prism? Can you help????
asked by Abby 
MATH NEEDS HELP NOWw
Consider the sequence t1=1, t2=1, and that tn=t(n2)*(n3)/(n1), where n>2. Find the value of t1998. (1998 is the term, so is n, t1, and t2)
asked by Anonymous 
Maths
Number of red circle shapes used in the patteren : 3 , 6 , 10 The first difference is +3 and + 4 which leads the second difference to be +1 What do I do after this? especially if the 1st difference is 1?
asked by Tia 
maths
An Aircraft Flies Round A Triangular Curve,the First Leg Is 200km On A Bearing Of 115^o And The Second Leg Is 150km On A Bearing Of 230^o.How Long Is The Third Leg
asked by Abrahamlinkong 
Physics
A bullet with mass (m) is fired vertically into a block of wood with mass (M) that is hanging from a rope at rest. If the billet has an initial speed Vi (initial velocity) find the height (h) that the block will swing into the air after the bullet becomes
asked by Stephy 
Maths
Pls Help(18m^28m) Solution 18m^8m M+18^2/8=0 (m+18/8)^2=8m324/64=0 ,...
asked by Abrahamlinkong 
science
how do you describe a scale im doing a portfolio and I don't know how too describe a scale please help me!!
asked by kakashi hatake 
physics
A person jumps out of a helicopter in midair to retrieve a small metal ball. He screams at 475Hz, but people on the ground hear him scream at 578Hz. The person is falling at __(m/s) Once he grabs the metal ball, he is pulled back up to the helicopter at
asked by chloe 
physicssound
A police car moving at 41 m/s is initially behind a truck moving in the same direction at 17 m/s. The natural frequency of the car's siren is 800 Hz. The change in frequency observed by the truck driver as the car overtakes him is __(Hz) Take the speed of
asked by chloe 
math
Find the sum of the infinite geometric series below, or indicate that the sum does not exist. 15+6+12/5+24/25+...
asked by Elise 
math
the width of a rectangular painting is 2 meters less than the length, the area of the painting is 20 M^2
asked by omar 
math
Samina spends three fourth of her pocket money to buy chocolates and rest to purchase chewing gum.find the ratio of amont spent on chocolates to that spent on chewing gums.
asked by azra 
Calculus
Suppose the integral from 2 to 6 of g of x, dx equals 12 and the integral from 5 to 6 of g of x, dx equals negative 3 , find the value of the integral from 2 to 5 of 3 times g of x, dx
asked by Brian 
Calc
Suppose the integral from 2 to 6 of g of x, dx equals 12 and the integral from 5 to 6 of g of x, dx equals negative 3 , find the value of the integral from 2 to 5 of 3 times g of x, dx
asked by Anonymous 
S.S
what is the most likely reason great Britain colonized the pacific region?
asked by Jayden 
chemistry
Under the same temp.and pressure ,nitrogen gas diffuses 8 times as fast as gas y .calculate the relative molecular mass of gas y.
asked by favour 
chemistry
A certain amount of gas occupy 5.0dm cube at 2atm.and 10 degree centigrade .calculate d number of mole present(R_0.082atm)
asked by favour 
Physics
The horizontal surface on which the block slides is frictionless. The speed of the block before it touch the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 0.15 m? The spring constant, k = 2000 N/m
asked by Nicole 
HISTORY (Korean War)
Was the Korean War a result from existing economic and political struggles? Could it have been a proxy war that involved World powers? Ideas on how I could answer this question would be helpful. Thanks!
asked by Hannah 
chemistry
Under the same condition of temp.and pressure hydrogen gas diffuses 8 times as fast as gas y.calculate the relative molecular mass of gas y.(R.M M_2
asked by favour 
Algebra
A boat traveled 180 miles downstream and back. The trip downstream took 10 hours. The trip back took 30 hours. Find the speed of the boat in still water and the speed of the current. Solve each system using any method
asked by Kevin 
chemistry
describe briefly a suitable laboratory procedure for separating a mixture of NaCl4,NH4Cl and PbCl2
asked by value 
Physics
An ideal spring hangs vertically from the ceiling. When 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is
asked by Nicole 
Math
I need help solving for all solutions for this problem: cos 2x+ sin x= 0 I substituted cos 2x for cos^2xsin^2x So it became cos^2(x)sin^2(x) +sinx=0 Then i did 1sin^2(x)sin^2(x)+sinx=0 = 12sin^2(x)+sinx=0 = sinx(2sinx+1)=1 What did i do wrong?? the
asked by Martha 
Algebra
A rectangle's length is 6 less than twice its width. The perimeter of the rectangle is 36 units. Set up and solve a system of equations to determine the length and width.
asked by Kevin 
Trig
Find all solutions in the interval [0,2pi) 4sin(x)cos(x)=1 2(2sinxcosx)=1 2sin2x=1 2x=1/2 x= pi/6, and 5pi/6 Then since its 2x i divided these answers by 2 and got pi/12 and 5pi/12 However, when i checked the answer key there solutions 13pi/12 and 17pi/12
asked by Martha 
Math
(3+1)+27divided by nine
asked by Marci 
ELA
How does the author of "John white and Roanoke " develop the idea that establishing a colony at Roanoke was going to be difficult?
asked by Jakiya 
math
13/y=8/3 solve the following proportion for y
asked by Susie 
Algebra
You want to purchase at least 10 tickets to a baseball game, but can spend at most $200. Lower level tickets &8 each, while upper level tickets cost $5. Write and graph a system of inequalities to represent the situation. Give two possible combinations of
asked by Carla 
Algebra
A rectangular pen with one side along a river will be bounded by a fence on the other three sites. If 600m of fence are available, what the dimensions of the rectangle should be in order to enclose maximum area and how much this area is?
asked by Anonymous 
Social Studies
1. Which of the following apply to fascism? Select all that apply. A rooted in militarism B extreme nationalism C respect for minorities D blind loyalty to the state I think its A,B, and c  2. Which of the following best
asked by Dave 
Science
1. A truck is traveling 20 m/s to the left and bill is moving at 4 m/s left. If you are in Postion A what velocity do you see bill moving at?
asked by Boberto 
Science
2. A cable pulls a 15.0 kg crate at constant speed across a horizontal table.The tension in the cable is 60.0 N. 1. What is the frictional force and normal force?
asked by Boberto 
Math
Which number is a solution of the inequality? 6>z(10z) A)0 B)1 C)2 D)
asked by EmberShy 
Math
3x+10 => 4 A. x => 2 B. x
asked by EmberShy 
Science
A physics student stands in an 64th floor. The students weights 810 N. What is his mass and normal force? Mass is 83? normal force is 810?
asked by Boberto 
Algebra
You walk at a pace of 3 miles per hour, and jog at a pace of 6 miles per hour. You want to cover a distance of more than 18 miles in less than hours. Write a system of inequalities to represent the situation. What is one possible combination of the number
asked by Carla 
operation and production management
what is meant by "operations" in a. a hospital b. a university c. a commercial bank
asked by Aisha 
Algebra
my salary will increase 9.3% next year. if my salary this year is represented by s. write an expression to represent my salary next year?
asked by G 
maths
how many 6P baggies can be bought for figure 2 TWENTIES, 1 TEN and 4pennies?
asked by bisi 
physical sciences
calculate the coefficient of kinetic friction for tyre rubber on the road surface
asked by pontsho 
math
A hotel gives every customer who makes a reservation a confirmation code. How many different confirmation codes can be created if each code has 4 letters followed by 2 numbers?
asked by Jessie 
Chemistry
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?
asked by Yo 
algebra
2x3y if x= 0.5 and y=0.7
asked by GeniusTigeress 
math
The probability that Jeff will be accepted to Green Valley College is 3/4, and the probability that Justin will be accepted to Blue Ridge College is 2/5. What is the probability that Justin will be accepted and Jeff will not?
asked by Rachel 
Social Stuides
Which one of the following is the best example of the isolationism Americans adopted after World War I? A Americans were warned not to travel on ships of countries at war. B The United States restored diplomatic relations with the Soviet Union. C Congress
asked by Monkey 
Ethics
In the treatment of terminally ill patients, is it logical to permit physicians to provide palliative sedation that is given with the intent of relieving suffering but that also can be reasonably expected to make a patient die more quickly while
asked by Anonymous 
Algebra
Form a quadratic statement from the given: Zeroes at 2 and 3, f(1)=12. f(x)=?
asked by Anonymous 
Math
I'm having trouble with this question At the movies, it costs $5.00 to rent each movie. If you do not return the rentals on time, it costs you $3.00per movie rental per day. You recently rented movies from the business and returned them 2 days late. The
asked by Ann 
math
A closed cylindrical storage container with a volume of 2800 cubic inches. The material for the top and bottom will cost $3 per square inch and the material for the sides will cost $4 per square inch. A) What dimensions of the container would minimize the
asked by Alexis 
biology
would it be easier if someone who doesn't have proprioception to go to space and return back to earth to walk normally or would it be the same?
asked by homework 
Prealgebra
Hey I'm having a lot of trouble with this question. An open box is to be made from a 20 inch by 40 inch piece of cardboard by cutting out squares of equal size from the four corners and bending up the sides. A) What size should the squares be in order to
asked by Anna 
physics
A car moving with a speed of 180kmh was brought uniformly to rest by the application of the breaks in 20s. How far did the car travel after the breaks
asked by Harrison 
word problem, please help
The local hospital currently has 25 nurses. The hospital administrator sees that they are adding 4 nurses each year to their staff (which included the loss from nurses leaving the hospital). The administrator knows that they need to have at least 41 nurses
asked by Carlos 
Math
Donna will donate up to $460 to charity. The money will be divided between two charities: the City Youth Fund and the Educational Growth Foundation. Donna would like to donate at least $160 to the Educational Growth Foundation. She would also like the
asked by Stanley 
math
There are 4 romantic novels and 6 adventurous novels on a book shelf. Without looking, Carmen chooses two novels out of the shelf. What is the probability that she chooses 2 romantic novels?
asked by Rachel 
Math
Brady buys 3 gallons of fertilizer for his lawn. After he finishes spraying the lawn, he has 1 quart of fertilizer left over. How many quarts of fertilizer did Brady spray on his lawn?
asked by Daniella 
Algebra
The US has an area of 0.75 miles squared, and LA has an area of 3,705,000 miles squared. LA's area is N× 10^ (n), where N=____ and n=_____
asked by Nancy 
Chemistry
When mixing 10m/L of 6 M HCl (diluted with 10 mL of water) with 0.1 g of Mg, how many moles of H2 are created and how many moles of Mg are reactant? I understand I must use n=(PV)/(RT) to find H2, since it is a gas, but the constant R is still confusing to
asked by Kendra 
Math
Bart is saving to buy a flat screen monitor that costs $345. He has already saved $37. What is the least amount of money Bart a must save each week so that at the end of 11 weeks he has enough money to buy the monitor?
asked by Sara 
mATH..OHHHH NOOOOO PLEZ HELP I AM STRUGGLING
Which statement is true? 1. all rectangles are squares 2. some trapezoids are parallelograms 3. all squares are rhombuses 4. no rhombuses are rectangles. Please help me. I need this done and fast. Mom don't know answer so I'm counting on you to help me.
asked by Abby 
Pam
What is the horizontal asymptote? y=x^2+11x+16/x+8
asked by Math 
math
1.The cost of a telephone call from Wilsonto East Meadow is $0,60 for the first three minutes plus $0.17 for each additional minute. What is the greatest number of whole minutes of a call if the cost cannot exceed $2.50? 2.When John bought his new
asked by Sara 
Math
There is a population of 6.848 billion people. There are roughly 57.9 million square miles of land on Earth, of which about 22% are favorbale for agriculture. Round answer to the nearest person. There are ___ people/ mile^2 of farmable land. I DIVIDED
asked by Julie 
social studies
what did the white southerners think the goal was all the northerners who moved south during reconstruction
asked by Momina 
Social Studies
What are some examples of the Primordial School of thought ?(Donald Horowitz)
asked by Mkada 
social studies
what was major cause of problems with the sharecropping system
asked by anon 
Pam
How to find the vertex ? f(x)= x^23
asked by Math 
Math
Rewrite the expression in terms of the first power of the cosine sin^8(x) how do i do this plz help !!
asked by Serena 
Chemistry
How many hydrogen atoms are present in 6.49 moles of hydrogen molecules
asked by Quaniece 
Math
1. The variables x and y vary directly. When x is 3, y is 6. Find x when y = 2/3. 2. The force acting on an object varies directly with its acceleration. A force of 25 newtons accelerates an object at 1.25 m/s. What is the acceleration of a 35 newton
asked by Mathew 
math
The annual cost of a gym membership can be represented by the function C(t)=3005t, where t is the number of years that one has belonged to the gym. If Jeffrey has been a member for 5 years, what is the total amount of money that he has paid to the gym
asked by Rachel 
Chemistry
Calculate how many moles of Na2S2O3 must be added to dissolve 0.020 mol AgBr in 1.0 L of water at 25°C (assume constant volume). AgBr(s) ↔ Ag+(aq) + Br−(aq) Ksp = 3.3 x 10^−13 Ag+(aq) + 2S2O32−(aq) ↔ [Ag(S2O3)2]3−(aq) Kf = 2.0 x 10^13 (1)
asked by bill 
physics
At each corner of an equilateral triangle, there is a charge, as diagrammed below. The length of each side of the triangle is .4 meters. Find the net force acting upon q1, given the following values for each of the charges: q1 = −2.00 μC, q2 = 3.00 μC,
asked by Anonymous 
physics
You push a charge of 0.1C through an electric field. Through this process, you do 48 J of work on the charged object. Determine the voltage between where you started and where you ended.
asked by Anonymous 
physics
Located 10 centimeters apart from each other are two charged particles. Both have equal mass. The second object has a charge that is twice as large as the charge on the first object. They experience a repulsive force of 95N due to the electrical
asked by Anonymous 
English
So I am answering some questions regarding the motifs of Macbeth. I was wondering if the quotes I have chosen are the right choices for each motif. I'm supposed to find quotes from the closing lines of Malcolm after killing Macbeth 1. Fair is foul and foul
asked by Samantha 
word problem
The length of a rectangle should be 9 meters longer than 4 times the width. If the length must be between 49 and 85 meters long, what are the restrictions for the width, w? asking for _____< or
asked by Carl 
ph
An electron is located within an electric field, with a strength of 800N/C. What is the magnitude of the force on the electron?
asked by Lenny 
Physics
A ball (mass of 0.5kg) is suspended on a string that is attached to the ceiling. The ball is charged with an unknown charge q. Determine the magnitude of the charge on the ball if the electric field strength is 2000N/C, and the string forms an angle of θ
asked by Lenny 
Algebra
Given: f(x) = 84x A. Find f(2) f(2) = 84(2) B. Find x, when f(x) = 8 84x = 8 C. Graph the function. ( a graph that has 20X and 20Y as the max numbers) D. State the domain and range of the function. (confused on what to do here) E. Use the graph to
asked by Ricky 
word problem, Im lost on how to set this up
Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to a) Get a C average on exams? f b) Get a B
asked by Carlos 
Physics
A 231 kg block is released at height h = 3.9 m. The track is frictionless except for a portion of length 6.6 m. The block travels down the track, hits a spring of force constant k = 1624 N/m, and compresses it 1.7 m from its equilibrium position before
asked by Dj 
Math
Find the correct end behavior diagram for the given function. f(x)= x^53x^36x+7
asked by April 
Math
A group of students were asked to select their preferred breakfast drink from among coffee, tea, and orange juice. The results of the survey are shown in the table along with information about whether the students are in high school (HS) or in college (C).
asked by Anonymous 
math
A chef is going to use a mixture of two brands of Italian dressing. The first brand contains 6% vinegar, and the second brand contains 11% vinegar. The chef wants to make 250 milliliters of a dressing that is 9% vinegar. How much of each brand should she
asked by Anonymous 
Math
The Gonzalez family wants to section off a triangular area to be used for raising chickens. They have three sections of fencing measuring 27 feet,33 feet, and 60 feet. Can the family create a triangular area using these three lengths? Explain your answer
asked by Huria 
math NEED HELP ASAP
The Royal Fruit Company produces two types of fruit drinks. The first type is 65% pure fruit juice, and the second type is 90% pure fruit juice. The company is attempting to produce a fruit drink that contains 75% pure fruit juice. How many pints of each
asked by Anonymous 
word problem, please
Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to a) Get a C average on exams? f b) Get a B
asked by Carlos 
Physics
The place kicker on a football team kicks a ball from ground level with an initial speed of 8.30 m/s at an angle of 19.0° above the horizontal. How long is the ball in the air before it lands on the ground again? You may neglect air resistance.
asked by Emily 
science
The question is: Calculate the pH of a solution that results from 50.0 ml of 0.15mol/L HCOOH with 75.0ml of 0.13mol/L HCOONa. I know I need to use the hendersonhasselbalch equation with the pka being 3.74 but I'm not sure how to get the ratio to plug in.
asked by Manika 
Math
A soup pot has a capacity of 6,000 milliliters. How many liters does the pot hold. 0.6 liters 6 liters 60 liters 600 liters I think it is 6 liters. Please help. :)
asked by Ciel 
math
Find the area of a circle with center (3, 4) that passes through the point (5, 2). First use the distance formula to find the radius of the circle. Use π = 3.14. ~ I did the distance formula and got 28 now i just dont know what to do after that please
asked by Jakis 
Physics
A coil of wire has a resistance of 31.8Ω at 28 °C and 55.6Ω at 53 °C. What is the temperature coefficient of resistivity?
asked by Brooke 
Physics
Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.527Ω. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 108 Ω·m, and that of aluminum to be 2.82 x 108
asked by Brooke 
Physics
A ball is tossed from an upperstory window of a building. The ball is given an initial velocity of 9.40 m/s at an angle of 21.0Â° below the horizontal. It strikes the ground 6.00 s later. (a) How far horizontally from the base of the building does the
asked by Emily 
Algebra
You walk at a pace of 3 miles per hour, and jog at a pace of 6 miles per hour. You want to cover a distance of more than 18 miles in less than 5 hours. Write a system of inequalities to represent the situation. What is one possible combination of the
asked by Carla 
Physic
A uniform plank of length 3 m is supported by two wooden trestles L and M as shown in the diagram above. L exerts a force of 80n upwards and M a force of 160N upwards. M is O.5m from the centre of gravity of the plank. calculate the weight w of the plank
asked by juanita 
Physics
A ball is shot from the top of a building with an initial velocity of 20 m/s at an angle θ = 39° above the horizontal. If a nearby building is the same height and 55 m away, how far below the top of the building will the ball strike the nearby building?
asked by Jen 
Algebra
A rectangle's length is 6 less than twice its width. The perimeter of the rectangle is 36 units. Set up and solve a system of equations to determine the length and width?
asked by Carla 
Maths, triangle trigonometry
P, Q and R are three fire towers. Q is 40 km N 72°E of P and R is 48 km S 55° E of P. Find the distance between R and Q and bearing of R from Q.
asked by Isabella 
bio
Imagine you are purifying a protein which accounts for 0.001% of the total protein within a cell. How many steps of purification are required to yield pure protein, assuming a 10 fold purification with each step of purification?
asked by sara 
Chem
A sample of a substance (containing only C, H, and N) is burned in oxygen. 7.961 g of CO2, 1.164 g of H2O and 1.551 g of NO are the sole products of combustion. What is the empirical formula of the compound?
asked by Tiffany 
Chemistry
A sample of a substance (containing only C, H, and N) is burned in oxygen. 7.961 g of CO2, 1.164 g of H2O and 1.551 g of NO are the sole products of combustion. What is the empirical formula of the compound?
asked by Cindy 
PhysicsWork, Energy, and Power
A 56.9 kg sledder descends an 8.21meter high hill, encountering a friction force of 11.7 N, Fill in the blanks and determine the speed of the sledder after traveling the 31.7 meters to the bottom of the hill. Top of the hill: KE=0J PE=_ W=_ Work=_ PE=0J
asked by Anonymous 
Maths, triangle trigonometry
The captain of a ship sailing along a bearing of 070oT observes two lighthouses in a line due North of himself. The ship continues on the same course for a further 5 km. Now, one of the lighthouses has a bearing of 280oT from the ship and the other has a
asked by Anonymous 
ADVANCED LEVEL PHYSICS
A particle travelling in a straight line with constant acceleration and starting from rest covers 36m in the 5th second.Find the acceleration and the distance traveled in the 6th second
asked by JIKU 
Calc
Compute Δy and dy for the given values of x and dx = Δx. y = x^2 − 7x, x = 6, Δx = 0.5
asked by Andy 
Physics
A 231 kg block is released at height h = 3.9 m. The track is frictionless except for a portion of length 6.6 m. The block travels down the track, hits a spring of force constant k = 1624 N/m, and compresses it 1.7 m from its equilibrium position before
asked by Dj