# Posts by Mark

Total # Posts: 1,616

Wave Particles
A stationary proton absorbs an x-ray with a wavelength of 0.24 nm. Determine the proton's final velocity.

Trig/Pre-Calc
A bird is flying 30 mph in a direction 30 degrees south of east. Affecting the flight of the bird is a wind blowing from the northeast to the southwest at a speed of 10 mph. What is the resulting speed of the bird?

Math
Joe takes his wife and four children to the movies. their tickets cost \$56. the adult tickets cost twice as much as the children's tickets. how much is one adult ticket?

geometry/check my work
For triangle ABC , which transformation composition is Commutative? a) rotate 30 degrees and then translate 2 units down b) translate 5 units to the right and rotate 90 degrees c) reflect across the y-axis and then rotate 90 degrees d) reflect across the y -axis and then ...

grammar-check my work thank you
Identify the phrase in parentheses as a gerund phrase, participle phrase or infinitive phrase. When the Christmas holidays arrive, (bustling shoppers fill the stores). I think it is a gerund phrase because it acts as a noun

physics
if f1= 3i + 5j + 6k and f2= 2i + 3j - 4k both measure the newton are displaced by d= 3i - 2j + 4k measure the metre, find the workdone

English
1. The idiom get inside the authors head means to 2. Base word of accusation

Physics
A car is traveling on a level horizontal rode comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side of the road the car is on 21.3m above the river, while the opposite ...

Physics
A car is traveling on a level horizontal rode comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side of the road the car is on 21.3m above the river, while the opposite ...

Math
thanks

Math
If I earn £200 a week,the tax man takes 3/8 of it and I pay my mum 1/2 of my earnings for rent , how much do I end up having to spend on things I want?

Organic Chemistry
Looking for the coefficient in Methylene chloride and water, by the way.

Organic Chemistry
What is the literature value for the partition coefficient for caffeine?

DISCRETE MATH FOR IT
Write a negation for the following statement: For all x , if x ? A ? B then x ? B.

English...check my work
parts of speech 1.Mason is fantastic at gossamer billowing. my answer: Mason=noun, is=verb fantastic=adjective at=preposition gossamer=adjective billowing=noun We get to go home early on Wednesday. my answer: We=pronoun get to go=verb home=noun early=adverb on=preposition ...

english grammar check please
parts of speech 1.Mason is fantastic at gossamer billowing. my answer: Mason=noun, is=verb fantastic=adjective at=preposition gossamer=adjective billowing=noun We get to go home early on Wednesday. my answer: We=pronoun get to go=verb home=noun early=adverb on=preposition ...

english grammar check my work
1. WE get to go home. answer(we=noun...get=helping verb to=helping verb=go=verb...home=noun). 2. A lot of kids have watched several times. (a=article....lot=adverb...of=preposiiton...kids=noun....several=adjective....times=noun) thank you so much!

english grammar check my answer
Can you help with the parts of speech: am I correct? 1. The high school game is at home tonight. answer:(The ..article..high school ..adjective... game...noun..at..preposition....home..noun....tonight...adverb) 2. The junior high track team is going to win when they start in ...

Math
Write an equation in the indicated form for each statement described below. (A graph shows two lines intersecting at x=-2 and y= 1 in a tilted X shape) A. Write an equation in slope-intercept form for the line parallel to the red line and going through the point (3,5). B. ...

Slopes
Write equation of the line through he point (-3, 2) with a slope of 1/4 in slope intercept form. I really don't understand this questions.

Math - fractions
But sir the second fraction is 5/7 not 4/7

check my work..math grade 8...surface area
A men's basketball is about 24.3 centimeters in diameter, while the diameter of a women's basketball is about 23.4 centimeters. What is the ratio of the surface area of a men's basketball to the surface area of a women's basketball? Round your answer to the ...

Chemistry
A container of gas at 53 psi is compressed to one third its original volume. What is the new pressure of the gas?

english 8th subject verb agreement
The flock of ducks flapping (its, their) wings gracefully overhead made very little noise. I think it's their Thank you.

subject/verb agreement english 8th
Shortly after taking office, presidents appoint the members of their Cabinets. I think it is correct...but I am not sure.(other than maybe it should just be Cabinet) singular form? thanks

Math!!!
Let z=-8+15i and w=6-8i. Compute zz/ww (each of the second ones, z and w, have a bar over them) where the bar represents the complex conjugate.

Math
What constant must we place in the question markbelow in order to be able to factor the resulting expression into the product of two linear factors: 2mn - 16m - 7n + ?

Physics
Describe a vibration that is not periodic. I'm not sure how to answer this! Please help?!

algebra
a certain positive number is equal to nine-tenths of the sum of the number and its reciprocal. find the number

Physics
We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J into another system. What is the efficiency of the heat engine? (show you work)

Statistic
Heights of men on a baseball team have a? bell-shaped distribution with a mean of 169 cm169 cm and a standard deviation of 9 cm9 cm. Using the empirical? rule, what is the approximate percentage of the men between the following? values? a. ?% of the men are between 142 cm and ...

Physics
How much heat energy is needed to change 0.25kg of water at 100°C to steam at 100°C? Show your work. Please don't give me the answer, I just need help figuring out how to find the answer. Thanks!

Math
The bottom 30% of the students failed an end of semester exam. The mean for the test was 130 and the standard deviation was 27. What was the passing score?

Physics
How much heat energy is needed to change 0.25kg of water at 100°C to steam at 100°C? Show your work. Please don't give me the answer, I just need help figuring out how to find the answer. Thanks!

Trigonometry
All values of theta are positive. From left to right, the first peak occurs at (pi/2,1) and the second peak occurs at (9pi/2). A. Write the graphs equation as a cosine function. B. Write the graphs equation as a sine function.

physics
Two forces are applied to a 0.5 kg hockey puck causing it to accelerate. The first force has a magnitude of 10.0 N and is applied to the puck at an angle of 80 degrees with respect to the x axis. The second force has a magnitude of 3.5 N and is applied to the puck at an angle ...

Math
Ricky took a survey in the fifth grade and found that 2/3 of the students ride the bus to school and 1/4 of the students walk. What fraction of the fifth grade students either ride the bus or walk to school?

Stats
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle ...

geometry
Find the measure of each exterior angle of a regular polygon whose central angle measures 120 degrees.

geometry
Find the measure of each interior angle of a regular polygon whose central angle measures 60 degrees.

Math ?
Yes absolutely. I will try my hardest, afterall the only thing I can do is to try my very best:)

Math ?
Alright, thank you so much. I am not happy with my marks at all, but I suppose some professors have high expectations.

Math ?
I have a dilemma; my English professor doesn’t give us our grades so I currently don’t know what percent I am at in the class. I really need to know since I need to know if I’ll be passing or not. He doesn’t grade anything with percent’s, and gives us ...

English
It is a riddle: We see it every morning, it has very many colours. At one point we all have in our lives Please help me solve this riddle and an explanation of it.

Physics
What is the reaction of the earth pulling down on a pen that is lying on a table

Help! [Math]
Would it be 2.7/9.0 x 10^1? Which then becomes 2.7/9.0 x 1? Which then becomes 2.7/9.0? So confused.

Help! [Math]
2.7/9.0 x 10^(-5)-(-6) = ? I can't figure it out :'c

English help
I added more of my ideas: Is the main conflict in Return of the soldier between Chris's desire to return to the past and his responsibility to the present, between Jenny and Kitty or is it between two other opposing forces? I must write an essay about this so please help ...

English
Rewrote This because I added more of my ideas: Is the main conflict in Return of the soldier between Chris's desire to return to the past and his responsibility to the present, between Jenny and Kitty or is it between two other opposing forces? I must write an essay about ...

English
Is the main conflict in Return of the soldier between Chris's desire to return to the past and his responsibility to the present, between Jenny and Kitty or is it between two other opposing forces? I must write an essay about this so please help me. I do feel its the first...

Math -data management
There are 5 rock songs, 6 country songs, and 3 hip-hop songs. How many different albums can be formed using the songs if the album should contain at least 1 rock song and 1 country song? My solution: 14C5x14C6x14C3-5C1x6C1 Is this correct? Thanks in advance

math
the schematic of a rectangular patio is drawn 1/8 inch to a foot if the patio is 18 feet long what is the measure of the patios length on the schematic

physics
an object of height 5cm is placed 20cm in front of a concave mirror of radius of curvature 20cm by graphical method, find image distance from the mirror

Math
11^2=11x11=121

Math
yes

Maths Constructions
You draw segment BC first. Then you use the protractor and mark 60 so you draw line at 60 the same for 75 ,and you connect the lines.

science chemistry
H2O+CuS->CuO+2H++2e 4H++SO4^2-=SO2+2H2O

math (algebera)
You have 4 unknowns?

Chemistry
There have been two ways on making transuranium elements: neutron bombardment and a)beta bombardment b)gamma bombardment c)positron bombardment d)photon bombardment e)heavy atom bombardment

geography
Which items are examples of human-environmental interaction? coal mines the interstate highway system meteor showers oil deposits shopping malls

Algebra II
A potter is making cups and plates. It takes her 6 minutes to make a cup and 3 minutes to make a plate. Each cup uses 3/4lb. of clay and each plate uses one lb. of clay. She has 20 hours available for making the cups and plates and has 250lbs. of clay on hand. She makes a ...

Math
Try writing the question exactly and completely as given to you without interpretation. I don't know what you are looking to find.

math
5(x+10) + x can be solved using the distributive property. First multiply the 5 times the x =5x Then multiply the 5 times the 10 = 50 You now have 5x + 50 + x. Combine like terms (5x and x) to arrive at the correct answer of 6x + 50

MATH
8

.25 inches per hour

English
It is the ugliest but has so many colors

geometry
I should clarify how to solve the problem. We start with V = pi r^2 h. Solve for r^2; 63 = pi r^2 5. First divide by pi and then by 5. Get the square root of your answer (4.0107) to get the radius of 2.002674. Next we increase everything by 100% and use a height of 10 and a ...

geometry
The volume of the larger beaker would be 504 inches cubed.

Math
If a run is 10 feet and the slope 1% what is the rise?

Trigonometry
two airplanes leave an airport at the same time one hour later they are 189km/hr apart. if one plane traveled 168km/hr and the other traveled 244km/hr for the hour what is the angle between their flight path

Trigonometry
11. If a navigation error puts a plane 2.5° off course, how far off course is the plane after flying for 2 hours at 152 miles per hour?

Trigonometry
10. A person notices that the angle of elevation from where he is standing to the top of a pole is 40°. Then he backs up 12 feet and notices that the angle of elevation to the top of the pole is now 32°. How tall is the pole?

Trigonometry
9. A boat travels on a course of bearing N37°W for 83 miles. How many miles north and how many miles west has theboat traveled?

Trigonometry
prove this identity: secθ +1/tanθ = tanθ/secθ −1

Trigonometry
28. Find all solutions if 0° ≤θ <360°. 4sin2 (3θ)−3= 0

Trigonometry
27. Solve for all radian solutions. sinx = −2cos x

Trigonometry
26. Solve for 0≤ x <2π . 2+3cos x = 2sin2 x −1

Trigonometry
24. Let cscθ = 5 with θ ∈QII and find the following. *use double identity a) cosθ b) cotθ

Math
2.4 (n - 1)= 12

Math
How 12in patio brick will fit a 13ft long 7ft wide space

Math
A group consists of 5 boys and 6 girls how many committees of five can be formed that consists of 2 boys and 3 girls?

HCC
if x=4 which of the following expression DOES NOT equil 9?

Math 1324
6400

Trigonometry
I need help graphing y=csc(x+pi/4) on the interval -pi/2<x<3pi/2

Physics! Volume!! HELP
An object hanging on a scale reads 24.0g when submerged in water, but 48.0 g when submerged in oil (specific gravity 0.80) Find the density of the object.

Math
The number of bacteria in a certain culture T hours from now grows according to A=800(3)^t what will the count be in 3.12 hours from now?

PHYSICS HELP! ROLLING MOTION
The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom. (a) Icm=935 g*cm2, M = 44g (b) ...

PHYSICS! HELIUM BALLON
Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 277.0 kg. What must be the minimum diameter of the spherical balloon?

my son's math help please
Each week Susie washes dishes three nights,washes clothes one night,empties trash cans two nights,and cook supper one night.If her Aunt Nancy stopped by randomly one night,what are the chances that Susie would be cooking that night!

help my son's math
Jamie won the spelling bee.she completed 8 more rounds than Antonio,who completed three times as many rounds as beth.If beth completed 6 rounds, how many rounds did jamie completed?

Algebra
Okay, so I got 60/17 = 3.529 hours?

Algebra
Sue, an experienced shipping clerk, can fill a certain order in 5 hours. Jim, a new clerk, needs 12 hours to do the same job. Working together, how long will it take them to fill the order?

Chemistry
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus. Write a balanced nuclear equation for alpha emission. Write a balanced nuclear equation for carbon-14 emission.

Algebra
Thank you Steve.

Algebra
I posted the wrong problem for my work provided, although I am struggling to answer both. The correct problem for my work provided is as follows. A car Traveled 132mi at a certain speed. If the speed had been 11mph faster, the trip could have been made in 2hr less time. Find ...

Algebra
Person A can paint the neighbor's house 2 times as fast as Person B. The year A and B worked together, it took them 5 days. How long would it take each to paint the house? So, i know how to setup the problem, but i'm not sure what steps I need to take to solve. This is...

physics
The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15 m? 1.0m x 1.0m distance.

physics
A 1400-N uniform boom at ϕ = 70.0° to the horizontal is supported by a cable at an angle θ = 20.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2250 N hangs from its top. (a) Find the tension ...

Math HELP!
For how many integers x does a triangle with side lengths 10,29 and x have all its angles acute. how do I know which side is the hypotenuse or does it not matter? Please give me an explanation.

Math HELP!
For how many integers x does a triangle with side lengths 10.29 and x have all its angles acute. how do I know which side is the hypotenuse or does it not matter? Please give me an explanation.

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