Saturday
December 10, 2016

Posts by jACK

Total # Posts: 1,695

Science
False. To become more stable, an atom that has two electrons in its outer energy level will give away two electrons.
December 8, 2016

Physics - studying for finals
(a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the following characteristics: A = 5.00 cm, ? = 75.0 cm, f = 5.00 Hz, and y(0, t) = 0 at t = 0. (Use the following as necessary: x ...
December 8, 2016

Physics - studying for finals
(a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the following characteristics: A = 5.00 cm, ? = 75.0 cm, f = 5.00 Hz, and y(0, t) = 0 at t = 0. (Use the following as necessary: x ...
December 8, 2016

Engineering science
As we have an ideal gas, we can assume that (P/T)initial = (P/T)final First, we must convert temperatures in Celsius to Kelvin. 27ºC = (27 + 273.15)K = 300.15K 79ºC = (79+273.15)K = 352.15K Let x represent (T)final 300.15 K ÷ 140,000 Pa = 352.15K ÷ x...
November 30, 2016

Physics
An ore car of mass 44000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 26 m lower vertically, is a horizontally situated spring with constant 4.5 × 105 N/m. The acceleration of gravity is 9.8 m/s 2 . Ignore friction. How much is ...
November 29, 2016

Physics
A 0.1134kg spherical meteor of diameter 3 cm enters the earth’s atmosphere at an elevation of 121920m with a velocity of 13411.2 m/s. The meteor’s temperature is -73.15?C. The specific heat at constant volume (Cv) of the meteor is 800 J/kg?C. (a) If the meteor has a ...
November 28, 2016

Maths
30
November 20, 2016

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...
November 18, 2016

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...
November 17, 2016

Physics
A quarterback throws a spiral to a receiver that is 40m away. The football has a spin of 14 rev/s and went through 58 revolutions before being caught. if the ball is caught at the same height it was thrown at, at what velocity and at what angle should the quarterback throw the...
November 9, 2016

Maths
Harry makes up a sequence. The first number is 6 and each number after that is 3 more than twice the previous number. What will the fourth number be in the sequence?
November 8, 2016

Maths
write down a number whose values lie between 5.4 and 5.5
November 8, 2016

Math
How many pieces 9 in long can be cut from a 15 ft.piece of wood
November 8, 2016

Math
A shopkeeper buys a table at ?300 and sells it for Rs.375.Find his loss or gain percentage.
November 4, 2016

English
i moved to the united states when i was young.As my parents already knew english it was easy for me to learn.
October 31, 2016

Physics
When the Sun is directly overhead, a hawk dives toward the ground at a speed of 6.09 m/s. If the direction of his motion is at an angle of 78.6 â—¦ below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s
October 31, 2016

Math Help!
you bring -9 to the other side so it'll be 9+9/10. make common denominator and solve it. then divide -2/5 by the answer of the above. so you will have x is < answer you'll get
October 21, 2016

Math
A rectangular school banner has a length of 36 inches and a width of 52 inches. A sign is made that is similar to the school banner and has a length of 22 inches. What is the ratio of the area of the school banner to the area of the sign? What is the ratio of the areas? I ...
October 20, 2016

Physics
A ball of mass m 0.285 kg swings in a vertical circular path on a string L = 0.810 m long as in the figure below. a) If its speed is 5.25 m/s at the top of the circle, what is the tension in the string there? 6.89N (is the answer) b)If the string breaks when its tension ...
October 7, 2016

Physics
A 145-kg object and a 445-kg object are separated by 3.90 m. (a) Find the magnitude of the net gravitational force exerted by these objects on a 34.0-kg object placed midway between them. (N) (b) At what position (other than an infinitely remote one) can the 34.0-kg object be ...
October 7, 2016

Physics
A 2 stage rocket launches off at an initial angle of 75 degrees above the horizontal. The rocket has a mass of 250 kg, while the stage 1 has a mass of 125 kg, and the stage 2 booster has a mass of 50 kg. At ignition the stage 1 booster gives the rocket a thrust of 34,652 N for...
October 4, 2016

chemistry
Write the balanced chemical equation for the oxidation of catechol to quinone.
October 4, 2016

physics
A stone is dropped from a 100m bridge. How long does it take the rock to reach the ground?
October 2, 2016

Physics
Two blocks, each of mass m = 3.35 kg are hung from the ceiling of an elevator as in the figure below. (a) If the elevator moves with an upward acceleration a with arrow of magnitude 1.7 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 = N T2 = N (b) If the ...
October 2, 2016

Physics
An object of mass m1 = 4.10 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m2 = 6.70 kg as shown in the figure -> Find the magnitude of the acceleration of the objects. (m/s2...
October 2, 2016

Physics
A block slides down a frictionless plane having an inclination of θ = 13.2°. The block starts from rest at the top, and the length of the incline is 1.70 m. -> Find the acceleration of the block. (m/s2 down the incline) -> Find its speed when it reaches the ...
October 2, 2016

Physics
An electron of mass 9.11 10-31 kg has an initial speed of 2.60 105 m/s. It travels in a straight line, and its speed increases to 6.00 105 m/s in a distance of 4.40 cm. Assume its acceleration is constant. (a) Determine the magnitude of the force exerted on the electron. ...N...
October 2, 2016

social studies
which four state capitals are located between 60 west and 70 west longitude
September 29, 2016

history
Which of the following is one of the notable achievements of early China?
September 28, 2016

world history
100
September 28, 2016

algebra
A train leaves the station at noon.The train is 180 miles from its destination at 12:45pm,and 90 miles from its destination at 2:15p.m..At what time will the train reach the destination?
September 27, 2016

science
Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons
September 27, 2016

algebra
What is the equation for the line with a slope of 7 and a y-intercept of -1 ?
September 19, 2016

algebra
What is the equation in slope-intercept form of the line that passes through (1,5)and has a slope of 3 ?
September 19, 2016

social studies
what were the guaranteed jamestown success
September 19, 2016

Physics
A bean jumps vertically off of a table. It has a speed of 10 m/s when it reaches half of its maximum height. How high does it rise?
September 17, 2016

Physics
A bean jumps off a table and when it reaches have its height it has a speed of 10 m/s, how high does it rise?
September 17, 2016

language arts
in which sentence is the word immensely used correctly
September 14, 2016

English
Why should you help old people across the street?
September 11, 2016

Tax
What item should not be included in income?
September 7, 2016

Math
A cashier has a total of 33 bills consisting of ones, fives and twenties. The number of twenties is 14 less than the number of ones. The total value of money is $164. How many of each denomination of bill are there?
September 6, 2016

Math
8 guppies
September 6, 2016

chemistry
12M HCl + H20→ 5M HCl How much water? Total Volume= Pls I need this tomorrow
September 1, 2016

Math
List the factors. Is this a prom or composite
August 29, 2016

Math
There are 12 animals in a farm.some are cows the rest are chickens.there are 28 animals legs in all.how many cows are there? how many chickens are there ?
August 26, 2016

English
i thought it was a name of grass so it should be capitalized ?
August 21, 2016

English
like lets say ur hiding in it. My mom was hiding in the High Grass?
August 21, 2016

English
Is High Grass capitalized?
August 21, 2016

History
thank you
August 19, 2016

History
did Amerigo Vespucci discovered the new world before columbus?
August 19, 2016

English
do you write annotations in appendix in a book?
August 18, 2016

Algebra
Are functions have one x and one y?
August 17, 2016

English
5-10
August 16, 2016

English
Annotating a book. How many literary devices should you list down?
August 16, 2016

History
I watched the movie The crucible 1996, can you give me any tips on how to write a synopsis?
August 16, 2016

English
If you had a book to annotate would you do it on the book or on paper?
August 16, 2016

Pricing Number
What does it mean if there is a comma in a number like this? $1,02
August 15, 2016

English
thank you
August 14, 2016

English
Is agony, and dumfounded tone words?
August 14, 2016

Math
The value of 50! Is the product of all the whole numbers from 1 to 50 inclusive, i.e. 50! = 1x2x3x...x49x50. Find the maximum number of divisions by 2.
August 14, 2016

English
What is Author's Word Choice?
August 3, 2016

algebra
thanks damon
July 19, 2016

algebra
if the x is on the numerator on the equation. is the equation linear?
July 19, 2016

CHEMISTRY
A 1.575 g sample of ethanedioic acid crystals, H2C2O4. xH20 was dissolved in water and made up to 250cm^3 . One mole of the acid reacts with two moles of NaOH. In a titration, 25.0 cm^3 of this solution of acid reacted with exactly 15.6 cm^3 of 0.160 mol/ dm^3 NaOH. Calculate ...
July 9, 2016

Chemistry
Considering only the molecular orbitals formed by combinations of the s atomic orbitals in the valence shell, how many molecular orbitals can be formed by 5000 sodium atoms?
June 15, 2016

Math trig
Hello guys. I am just wondering if tan^2 A (tan squared A) = sin^2 A /cos^2A And 2tan A = 2sin A / 2cos A This has been bothering me when I have to simplify trig. Thanks in advance.
June 1, 2016

Algebra 1
An airplane travels for seven hours with a 60 mph tailwind on the return trip against the same wind it took the plane nine hours find the speed of the plane with no wind.
May 30, 2016

Maths , logarithms
Thank you Reiny Your answer is very clear and shows what I did wrong. Keep up the good work.
May 29, 2016

Maths , logarithms
Sorry it wasn't clear the problem was this 2^(2x+1) -9*2^2x = -4
May 29, 2016

Maths , logarithms
Hi bob For the first log problem , it was in a test and my answer was wrong , could it be a marking error?
May 29, 2016

Maths
2^2x+1 - (9)2^x = -4 Can someone please solve for x ? My answer is x= 2 , is this correct?? Please show your steps
May 29, 2016

Maths , logarithms
Can someone solve for x please. I don't understand it. 2^x . 7^x = log 14 My answer : 14^x = log 14 = log14÷log 14 = x X=1 Is this right????
May 29, 2016

english
Which of the following correctly defines blank verse? A. poetry with no structure or rhyme B. a type of long poem often used for plays C. a type of rhymed poetry Shakespeare uses throughout his plays D. unrhymed verse written in iambic pentameter i think it's A
May 24, 2016

Math
154lb person burns 420 calories per hour riding an exercise bicycle at a rate of 15 mi/hr. Write a function rule to represent the total calories burned over time by that person. Explain how the information in the problem relates to the function.
May 20, 2016

Trigonometry
A hinged crane which measures 19m makes an angle of 50° with the ground. A malfunction causes the lock on the hinge to fail and the top part (of 14.6m) of the crane swings down. How far from the base of the crane does the top hot the ground.
May 19, 2016

math
Can you help me? For the problem .6 is 266 2/3% of what number? would I change 266 2/3% to a decimal and put it over 100?
May 14, 2016

Math Help please!
11. A basket contains the following pieces of fruit: three apples to oranges two pairs two bananas and five peaches. Jack pics of fruit at random and does not replace it then, Bethany pics of fruit at random. what is the probability that Jack gets a peach and Bethany gets an ...
May 9, 2016

math
T =ƒ­aƒy+ beƒ{^- kt (Equation 2) where T is the temperature at time t, and a, b and k are constants with values a = 20 „aC, b = 80 „aC and k = 2.6 ¡Ñ 10ƒ{4 sƒ{1. Differentiate Equation 2 with respect to t and thus give values...
May 5, 2016

Math
A boy is trying to find the height of a tree. When he stands 95.5 metres away from the tree (the distance D in Figure 2) the angle shown as è in Figure 2 is 31.5°. The boy’s eyes are 1.15 m from the ground (h in Figure 2). What is the height of the tree? You ...
May 5, 2016

Calculus
Use the trapezoidal rule with n = 5 to approximate. Keep at least 2 decimal places accuracy. Integrate: (cos(x))/(x) from x=1 to 5
May 3, 2016

Math
A florist used 12 flowers to make a bouquet, including 4 daisies. What is the probability that a randomly selected flower will be a daisy?
May 1, 2016

Software Engineering
Consider the following program (written in pseudo-code) begin x:= 0; y:= 1; z:= 1; while y <= n do x:= x+1; z:= z+2; y:= y+z; od sqrt := x; end Prove the partial correctness of the program with respect to the following predicates: Pre: {n>=0} Post: {sqrt2 <= n and n &...
April 21, 2016

World History
Who was firends with Joseph Stalin?
April 13, 2016

World History
what was Joseph Stalin favorite music, and movies?
April 13, 2016

Geometry
???
April 13, 2016

Geometry
2513.27 cm^2
April 13, 2016

Geometry
John bought a conical hat on a recent trip to central Vietnam. The basic frame of the hat is 16 hoops of bamboo that gradually diminish in size. The hat is covered in palm leaves. If the hat has a diameter of 50 centimeters and a slant height of 32 centimeters, what is the ...
April 13, 2016

math
the first, second, and third terms in the geometric progression are k,k-6, 2k-28 respectively. given that all terms of the geometric progression are positive, calculate the value of constant k.
April 13, 2016

algerbra
a rectangle with width 2x+5 inches has an area of 2x^4+11x^3-5x^2-98x-120 square inches. Write a polynomial that represents its lenght
April 11, 2016

Math
For this problem (2)^0 (-2)^0 would I add the exponents? I f so what do I do with 2 and -2?
April 9, 2016

Calculus
Function is y=x2 . Take three points, x=2, x=3, x=4. Approximate this function at these three points for a deviation Δx =0.1. Which of the three points does the approximation works best? Which point does it works worst?
April 6, 2016

English
whats the answer
March 31, 2016

Math
It is 393
March 29, 2016

College Physics
A student of mass M = 82 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 15 m. The force due to the seat on the student at the top of the loop-the-loop is FN = 696 N and is vertically down. What is the apparent ...
March 17, 2016

physics
125
March 15, 2016

Physics
A jet plane is flying at a constant altitude. At time t1=0 it has components of velocity Vx=90m/s, Vy=110m/s.At time t2=30.0s the components are Vx=-170m/s, Vy=40m/s.a).Sketch velocity vectors at t1 and t2.How do these two vectors differ?. For this time interval calculate b). ...
March 6, 2016

Math
can someone answer this ?
March 5, 2016

calculus
just wanted solutions and maybe working out as my previous year exams papers don't come with solutions. So I cant compare to see if I got it correct or not.
March 5, 2016

calculus
a) Let f(z) = z^2 and γ(t) = 1 + it^3, t ∈ [0,1]. i) Write out the contour integral ∫γ f(z)dz as an integral with respect to t. You do not need to evaluate this integral. ii) Evaluate the integral ∫0,1+i z^2dz iii) What is the relationship between ...
March 5, 2016

calculus
Thank you. Just wondering why 3T can be 3 pi, 5 pi, pi. Also just need c and d.
March 3, 2016

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