Sunday
June 26, 2016

Posts by frank

Total # Posts: 474

physics
i need an answer urgently!please
June 6, 2016

physics
A spinal spring,loaded with a piece of metal,extends by 10.5cm in air.When the metal is fully submerged in water,the spring extends by 6.8cm.Calculate the relative density of the metal using Hooke's law
June 6, 2016

Physics
i dont know the answer guys..please help me out
June 6, 2016

Math
(4x^2 - 2x-1) - (-3x^3 + 2)
May 31, 2016

Math
Many has two boxes one contains 10 colored pencils 4 of witch are red and 6 which are green the other box onther box contains 7 markers and which 4 are red and 3 are blue what's the probability of of many choosing green green pencil and red marker
May 30, 2016

statistics
0.29
May 12, 2016

Biomechanics/Physics
A 125 pound female is late for her biomechanics final and after arriving dashes up 40 steps each 15cm high in 1.65 seconds to take a seat and start the test. Hint: 1 lb = 4.47N How much work did she perform running up the steps?
May 7, 2016

Government
What are the three methods special interests groups might use to win favorable votes form legislators ?
April 25, 2016

life orientation
Six ways that the human rights violation influences individuals group and the broader south Africa community
April 20, 2016

math
Let a be -1/6 and let b be 1/2. Let x be the sum of the reciprocals of a and b, let y be the product of the reciprocals of a and b, and let z be twice the reciprocal of a divided by the reciprocal of b. Calculate x+y+z.
April 19, 2016

math
the answer is simply 23.
April 19, 2016

math
I took a test today that had 50 questions I needed 70 percent to pass I missed 10 questions what is my percent?
March 23, 2016

History
what was the Rhode Island connection with the cotton gin?
February 29, 2016

Pre-Calculus
An investor has $100,000 to invest in three types of bonds: short-term, intermediate-term, and long-term.How much should she invest in each type to satisfy the given conditions? Short-term bonds pay 4% annually, intermediate-term bonds pay 5%, and long-term bonds pay 6%. The ...
February 28, 2016

Can you check an answer for me?
Awesome, thanks Steve!
February 20, 2016

Can you check an answer for me?
There is a jar with 16 marbles. 4 are red, 7 are blue, and 5 are green. You select two marble at random. One marble is drawn and not replaced. Then a second marble is drawn. What is the probability of selecting a red marble and then another red marble? a. 3/64 b. 1/4 c. 1/20 d...
February 20, 2016

Please help me on math, thanks!
If no digit may be used more than once, how many 2-digit numbers can be formed using only the digits 5, 6, 3, and 2? 11 12 10 2
February 20, 2016

History
GOT IT, ITS c
January 31, 2016

History
C!
January 31, 2016

History
huh?
January 31, 2016

History
D?
January 31, 2016

History
3.)Which of the following are possible results of the Monroe Doctrine? A.)Native Americans are forced off their lands in the West. B.)More Americans move westward seeking gold and riches. C.)The U.S. stops a Spanish ship from entering Florida waters. D.)European countries have...
January 31, 2016

Physics
An airplane has a velocity of 580 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 92 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth (answer...
January 24, 2016

Math
My math problem says seven tenths exceeds seven thousandths by what number. Do I subtract like this: 0.007 - 0.7
January 24, 2016

MATH
In a drawer Richard has 5 pairs of gloves. Each pair has a different color. On Day 1 Richard selects two individual gloves at random from the 10 gloves in the drawer. On Day 2 Richard selects 2 of the remaining 8 gloves at random and on Day 3 two of the remaining 6 gloves at ...
January 19, 2016

Theory of interest
An annuity last for 12 calendar years.At the end of each quarter,there is a payment.First quarter payment are $200,second quarter payments are $300,third quarter payments are $150 and fourth quarter payments are $400.Find the accumulated value of this annuity just after the ...
December 15, 2015

Theory of interest
An annuit last for 12 calendar years.Atthe end of each quarter,there isa payment.First quarter paynments are $200,second quarter payments are $300,third quarter payments are $150 and fourth quarter payments ate $400.Find the accumulated value of this annuity just after the ...
December 15, 2015

Theory of interest
An annuity last for 12 calendar years.At the end of each quarter,there is a payment.First quarter payments are $200,second quarter payments are $300,third quarter payments are$150 and fourth quarter payments are $400.Find the accumulated value of this annuity just after the ...
December 15, 2015

chemistry
a solution is known to contain Cl, NO3, NO2, and SO4 ions. which of these ions can be positively identified?
November 8, 2015

chemistry
why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid soulution?
November 8, 2015

Maths
In an exam a student scored 60 marks out of a possible 80. What percentage is this
November 1, 2015

Principles of Finance
Warmack Machine Shop is considering a four-year project to improve its production efficiency. Buying a new machine press for $490,000 is estimated to result in $200,000 in annual pretax cost savings. The press falls in the MACRS five-year class, and it will have a salvage ...
October 31, 2015

Principles of Finance
Romo Enterprises needs someone to supply it with 121,000 cartons of machine screws per year to support its manufacturing needs over the next five years, and you’ve decided to bid on the contract. It will cost you $880,000 to install the equipment necessary to start ...
October 31, 2015

Principles of Finance
A five-year project has an initial fixed asset investment of $335,000, an initial NWC investment of $35,000, and an annual OCF of −$34,000. The fixed asset is fully depreciated over the life of the project and has no salvage value. If the required return is 10 percent, ...
October 31, 2015

Chemistry
How many nanoliters of a 1.00 molar solution would be required to react with 5.00 grams of barium nitrate?
October 24, 2015

Algebra 2
Did I perform this operation correctly? (a^2-b^2)/(a^2-2*a*b+b^2) /(2*a^2+5*a*b+3*b^2)/(2*a+3*b) = 1/a-b
October 2, 2015

Physics
What effect does the normal force have on the coefficients of friction?
September 29, 2015

Physics
A storage battery has an emf of 6.3 volts and an internal resistance of 0.01 ohm. it is to be charged for 120 amperes.hours from a 30 volt emf source having a resistance of 0.08 ohm at the rate of 20 amperes. a. compute for the resistance needed b. what is the cost of ...
September 16, 2015

chemistry
Le Chatelier's principle lab
September 13, 2015

chemistry
What assumption did you make about the reaction of KMnO4 solution in those determinations where temp didnt change to allow k to be a constant?
September 6, 2015

Ebhs,maths,siswati,english and business studies
I am frank,i have 4 credits with me namely,maths,siswati,business studies and english,am asking what courses i can take
September 4, 2015

Life orientation
Can you please help with this question which says'descrie a recent service delivery protest in your community or in the neibourhood.what are the problem that the community faced?.under the following topic:campaign with responsibility
May 16, 2015

math
At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50. 1.A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? 2.50/1 2. Assuming the price of clothing increased ...
May 14, 2015

chemistry
A particular brand of toothpaste claims to contain 0.24 wt% sodium fluoride. What mass in grams of fluoride ion would be present in the average amount of toothpaste used to brush one's teeth, about two grams? Now this is a weight percent concentration question, I know that...
May 7, 2015

chemistry
As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these ...
May 3, 2015

Calc
A stone is thrown straight up from the edge of a roof, 625 feet above the ground, at a speed of 20 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later?
April 21, 2015

PE
I got 8/12
April 20, 2015

math
write an addition equation the equation must have a 1 a 2 a 3 digit added and use all of these digits 662-228-8000
April 15, 2015

math/physics
A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp, frequency and steady ...
April 10, 2015

Math i need someone awesome to help! ASAP
which measure correctly completes the statement 627 L = ? mL
March 19, 2015

Geometry
Write the equation of a circle given the following: Diameter measures 15 units and the center is at the intersection of y =x + 7 and y= 2x-5
March 1, 2015

quadratic formula
okay thank you
February 27, 2015

quadratic formula
My chemistry professor wants us to use the quadratic formula
February 27, 2015

quadratic formula
2x^2=-8x+10 I got x=-2-1i x=-2+1i But every time I plug the numbers back into the equation I am not getting the sides to equal. Not sure how to use the imaginary i.
February 27, 2015

solution making/ chemistry/biotech
I thought it did but that's all the question gives you
February 26, 2015

solution making/ chemistry/biotech
You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 37.5 by dividing 750/20 but I am not sure
February 26, 2015

Solution Making
Suppose you start with a 5X solution A, and you want a final volume of 10ul of 1X solution. How much Solution A do you need? Can you please check my work not sure. I need 2 ul of solution A to 8 ul of H2O. 5/1=.2*10=2
February 23, 2015

solution making/ chemistry/biotech
thank
February 23, 2015

COMM/215
I would like to know if i have used the correct grammar and punctuation in the following two sentences: 47. "Have you ever read the story, 'The Tell-Tale Heart' by Edgar Allen Poe?" Dave asked. 48. "Did the professor say, 'Put down your pencils'...
January 31, 2015

COMM/215
I would like to know if i have used properly structured sentences for the following: 49. To succeed in the new economy, workers will have to learn throughout their careers adapt to changing circumstances, and self-motivate when needed. 50. Some students hate math; some ...
January 31, 2015

AP Calc
find f(x), if f'(x)=2x-3 and the graph of y=f(x) contains the point (2,5).
January 19, 2015

algebra
the lenght of a rectangular is 50 feet more than the width,it the perimeter of the basketball court is 300 feet,what is the lenght of the field
January 17, 2015

Intro to computers
You have set up Remote Desktop for the company server running Server 2008 so that your users can RDP in from their XP workstations. Users are calling you saying that they are being denied the ability to remote in. What is the most likely reason? A. XP does not support Remote ...
January 11, 2015

Physics
An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014

Physics
An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014

Physics
An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014

Physics
857.5hz?
December 13, 2014

Physics
What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?
December 13, 2014

Physics
Thanks!!
December 13, 2014

Physics
A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
December 13, 2014

physics
Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?
December 11, 2014

Physics
Does P=V^2/R seem correct?
December 11, 2014

Physics
A 30 ohm resistor is connected to a 1.5 V battery. How much power is dissipated by the resistor? I'm confused of the formula to use here.
December 11, 2014

Physics
A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?
December 11, 2014

Physics
A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup? What formula do I use for this?
December 10, 2014

Physics
Aluminum has a resistivity of 2.7*10-8 Ùm. What would be the resistance of 100 m of aluminum wire with a cross-sectional area of 2*10-4 m2?
December 10, 2014

Physics
How can you demonstrate that water is denser than ice without weighing them? What is the principle involved?
December 10, 2014

Calculus angle of elevation
Bob is wrong dx/dt = 3ft/s, dƟ/dt = ? 5ft/x = tan Ɵ Differentiating each side with respect to the time: (-5ft)/x^2 dx/dt=〖sec〗^2 ϑ dϑ/dt So dϑ/dt=(-5ft)/x^2 dx/dt.〖cos〗^2 θ We want to evaluate the change at the ...
December 9, 2014

chemistry
EDTA: 292.2 1. How would you make 250ml's of a 15% EDTA solution 2.How much of solution 1(above)should be used to make 500ml's of a .1% EDTA solution.
December 5, 2014

Physics
I don't get it
November 16, 2014

Physics
A ball is thrown horizontally from the top of a building 45.9 m high. The ball strikes the ground at a point 121 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
November 16, 2014

physics
THANK YOU I actually needed only the second part and I did the same as u but I forgot to put parentheses!
November 16, 2014

physics
A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 22.7 m/s. At the same time, it has a horizontal velocity of 58.9 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s At what angle with the ...
November 16, 2014

Math
Np
November 16, 2014

Math
28 inches
November 16, 2014

Advanced Algebra
The polynomial function defined by f(x) = 1 − x + x^2 − x^3 + ... + x^16 − x^17 may be written in the form f(y) = a_0 + a_1 y + a_2 y^2 + ... + a_16 y^16 + a_17 y^17, where y = x + 1 and a_i s are constants. Find a_2.
November 15, 2014

Calculus
Find the points at which y = f(x) = x^11-6x has a global maximum and minimum on the interval 0 ¡Â x ¡Â 4 Round your answers to two decimal places. Global Maximum: (x,y) = (,) Global Minimum: (x,y) = (,)
October 29, 2014

physics
Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed as shown in the figure below. The dimensions of the cutout are a = 4.50 ft and b = 1.70 ft. HINTS: Think of the board as being made of ...
October 28, 2014

physics
Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...
October 18, 2014

Math College (Algebra)
How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
October 11, 2014

physics
A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...
October 9, 2014

chemistry
Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.
September 27, 2014

Fractions
How many 1/4 cup servings are in 5/6 cup of raisins?
September 23, 2014

chemistry
thank you, i forgot to convert the mols, once i put that part in. I got about the same thing as you
September 22, 2014

chemistry
A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) -> Na2CO3(s) + H2O + CO2(g)
September 22, 2014

chemistry
Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2
September 20, 2014

chemistry
thank you
September 20, 2014

chemistry
Calculate the number of C atoms in a .25mg sample of C8H10N4O2
September 20, 2014

chemistry
balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml
September 20, 2014

Economics
Country A is producing 4 units of X and 8 units of Y and country B is producing 4 units of X and 6 units of Y. The opportunity cost of producing more of A) good X is the same for both countries. B) good Y is the same for both countries. C) good X is lower in country A. D) good...
September 15, 2014

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