Sunday
December 21, 2014

Posts by Robert


Total # Posts: 852

Physics 130
It says nothing about friction, so assume its frictionless.
February 25, 2014

Physics 130
you push a 15kg cart with a force of 20N, 30 degrees below the horizontal. what is the normal force? Please help test tomorrow.
February 25, 2014

physics
A 2.5kg solid homogenous ball is rolling without slipping at 3.0 meters per second to the right on a level surface. The diameter of the ball is 80 centimeters. What is the total kinetic energy of the ball? Can someone give me the equation for this?
February 24, 2014

Physics
A 2.5kg solid homogenous ball is rolling without slipping at 3.0 meters per second to the right on a level surface. The diameter of the ball is 80 centimeters. What is the total kinetic energy of the ball? Can someone give me the equation for this?
February 24, 2014

chemistry
If 1.87 g of acetic acid(CH3CO2H) reacts with 2.31 g of isopentyl alcohol(C5H12O) to give 2.96 g of isopentyl acetate(C7H14O2), what is the percent yield of the reaction?
February 23, 2014

Physics
First start with an isothermal expansion at 2.0 atm from 1.0 L to 4.0 L. If this now is adiabatically compressed back to its original volume, what is the change in internal energy here? Also what are some examples of these processes?
February 18, 2014

english
romance
February 4, 2014

physics
sin inverse of .032
January 28, 2014

physics
Voltage=12V. R1=2.0ohms and R2=4.0ohms. Find the power used by R2.
January 26, 2014

science
A car of mass 1500 kg accelerates up a hill of incline 8 degrees, increasing its speed from 4 ms to 16 ms over a distance of 90m. Assuming a total frictional resistance of 1000 N, calculte: a) the tractive effort between the wheels and the road surface b)the work done during ...
January 26, 2014

language arts
3. What inference can you make about Jo based on the selection? (1 point)Jo is adventuresome and enjoys traveling to new places. Jo is afraid of activities in the water. Jo is worried about what other people think of her. Jo is quiet and shy around new people.
January 21, 2014

Physics
Earlier I posted the tension question I knew how to get the equation of 50*9.81 = 2 (4360) sin A. I just don't know how to find (sin A) from here.
January 20, 2014

physics
The combined mass of a man and a chair suspended at the midpoint of a rope of negligible mass is 50 kilograms. The rope is connected to a weight of 4360 newtons hanging from a massless frictionless pulley. Find the angle.
January 20, 2014

Physics -- URGENT
Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...
January 8, 2014

Physics AP
A conical pendulum is formed by attaching a 50 g mass to a 1.2m string. The mass swings around a circle of radius 25cm. A claculate the speed of the mass. B Calculate the acceleration of the mass. C calculate the tension in the string
December 19, 2013

grade 12 Functions
A ferris wheel with a diameter of 60m rotates at a constant speed three times every 1.5pie minutes and reaches a maximum height of 62m from the ground. if you started the ride when it is at its highest point, on what internal of time would you be more than 58m above the ground...
December 17, 2013

Physics Classical Mechanics
A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 4.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 40.0∘ with respect to the horizontal. Assume that ...
December 12, 2013

math
The bases of trapezoid ABCD are \overline{AB} and \overline{CD}. Let P be the intersection of diagonals \overline{AC} and \overline{BD}. If the areas of triangles ABP and CDP are 8 and 18, respectively, then find the area of trapezoid ABCD.
December 8, 2013

Math
An article in the local paper states that 30% of the students at Oak Grove Middle School earned a place on the Silver Honor Roll. If there are 920 students at Oak Grove, how many are on the Silver Honor Roll? USE A PERCENT RULER TO HELP YOU DECIDE. SHOW ALL YOUR WORK... I DONT...
October 30, 2013

physics
A stone is dropped off a cliff, the last 1.5 seconds before it reaches the ground it travels 30 meters. Find the height from which it dropped & final velocity
October 7, 2013

science of speed and acceleration
You are traveling at a speed of 42 miles in .75 hours and slow to a speed of 42 miles in 1.25 hours. What is your rate of deceleration?
September 24, 2013

science
You are traveling at a speed of 42 miles in .75 hr and slow to a speed of 42 miles in 1.25 hr. What is your rate of declaration?
September 24, 2013

College Algebra
If a ball dropped from the top of a 400 ft building to hit the ground, how long would it take in seconds?
September 8, 2013

physics
666 meters
September 1, 2013

physics
A bus accelerates from rest at 1.5m/s^2 for 12s. It then travels for 25s after which it slows to a stop with an acceleration of magnitude 1.5m/s^2. (a) Find the total distance the bus travel snd its average velocity of the trip.
September 1, 2013

physics
A bus accelerates from rest at 1.5m/s^2 for 12s. It then travels for 25s after which it slows to a stop with an acceleration of magnitude 1.5m/s^2. (a) Find the total distance the bus travels And its average velocity of the trip.
September 1, 2013

math
my domain is 1,2,3,4,5,6 and my range is 180,165,150,135,120,105, the domain is increasing by 1 and the range is decreasing by 15 but I do not know how to write the function
August 23, 2013

algebra!!!! please help me!!!!
The smallest possible positive value of 1−[(1/w)+(1/x)+(1/y)+(1/z)] where w, x, y, z are odd positive integers, has the form a/b, where a,b are coprime positive integers. Find a+b.
June 14, 2013

Pre-Calculus
A gardener has 100' of edging. She wants to use it to enclose a 130 square foot rectangular area; she does not have to use up all of the edging. What are the possible lengths that a side of the rectangle can have? Answer using interval notation. Hint: If the length of the ...
May 30, 2013

GEOGRAPHY
Assume that a parcel of air is forced to rise up and over a 6000-foot-high mountain. The initial temperature of the parcel at sea level is 76.5°F, and the lifting condensation level (LCL) of the parcel is 3000 feet. The DAR is 5.5°F/1000’ and the SAR is 3.3°F/...
May 26, 2013

vectors problem!!!! help!!!!
thanks sir!!!!
May 26, 2013

vectors problem!!!! help!!!!
Vectors u=2i+9j+0k and v=13i+18j+0k. What is the value of |u×v|?
May 26, 2013

help!!!!! Probability!!!
thanks sir...
May 26, 2013

geometry!!!! PLEASE HELP!!!!
Two angles of an isosceles triangle are 68∘ and x∘. What is the sum of all the (distinct) possible values of x?
April 24, 2013

math
joey planted 2/5 of the garden and jane planted 1/3 what fraction of the garden did they plant
April 24, 2013

physics
A bead of mass m = 40.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground.
April 12, 2013

math
1. 2xsquared-7x=-6 2. xsquared + 12x + 1= 0 3. xsquared + 6x + 20 = 0
April 9, 2013

Physics (fluids)
1. You have a large wind tunnel of cross-sectional area 0.61[m2]. The wind speed is 4[ms-1]. Assume air density is 1 [kgm-3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough ...
April 7, 2013

math
That is not the only option it is A.5 B.6 C.10 D.180
March 30, 2013

math
At a dinner 1/6 of an apple pie is severed each time it is ordered. How many total apple pies would be served if apple pie was ordered 30 times in one day? A.5
March 30, 2013

mathematics
what is a rectangular area model?
March 28, 2013

physics
A car traveling at 150 miles/hour strikes a wall and bounces backwards at 30 miles/hour. If the car is in contact with the wall for 0.1 seconds, what is the force that the car exerts on the driver.
March 24, 2013

Chemistry
How many milliliters of 6.50 M HCl(aq) are required to react with 5.95 g of an ore containing 35.0% Zn(s) by mass?
March 20, 2013

science
How does the hierarachical organization of organisms work within a system?
March 20, 2013

Chemistry
59.0 mL of a 1.80 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 171 mL of water. What is the final concentration? Assume the volumes are additive.
March 19, 2013

Chemistry
How many milliliters of 11.5 M HCl(aq) are needed to prepare 310.0 mL of 1.00 M HCl(aq)?
March 19, 2013

math(statistics)
1. Assume that x is a binomial variable with an expected value of 3 and variance of 2.4 .find (a) P(x=0) (b) P(x=12) THnxs
March 19, 2013

english
Write the pronoun in these sentences. Then write the underlined words,that they replace. " Let us think of a way to clean up litter," said Matt and Lynn. ( the underlined word is Matt and Lynn)
March 18, 2013

median help
Pat recorded the weights of the first ten fish she caught and released at Mirror Lake this season. The weights were 8 lb, 6 lb, 9 lb, 6 lb, 7 lb, 5 lb, 7 lb, 6 lb, 23 lb, and 6 lb. What is the median of the data set
March 8, 2013

math help
please help
March 8, 2013

math help
Pat recorded the weights of the first ten fish she caught and released at Mirror Lake this season. The weights were 8 lb, 6 lb, 9 lb, 6 lb, 7 lb, 5 lb, 7 lb, 6 lb, 23 lb, and 6 lb. What is the median of the data set
March 8, 2013

Chemistry
1.) A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the oxide? 3.) 2.000 grams of a sample containing Co, C2O4, and H2O showed there to be 0.9621g of oxalate in the sample. Was is...
March 3, 2013

physics
A girl whirls a stone in a horizontal circle 1.5 m above the ground by means of a string 141 cm long. The string breaks, and the stone flies of horizontally and strike the ground 13.6 m away. What is the centripetal acceleration of the stone while in circular motion?
February 22, 2013

Chemistry
A sample of metallic element X, weighing 4.315g, combines with0.4810 L of Cl2 gas (at normal pressure and 20.0C) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948g/L, what is the mass of chlorine? The amu of chlorine is ...
February 18, 2013

Physics please help im DESPERATE
A small steel ball bearing with a mass of 17.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.23 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 39.0 deg ...
February 8, 2013

physics
If 3000ft/3 of air crossing an evaporator coil and is cooled from 75F to 55F, what would be the volume of air,in ft/3, exiting the evaporator coil?
February 1, 2013

Math
I still need help. That didn't help me.
January 31, 2013

Math
Use fraction strips to find each sum or difference. Simplify if possible. 2 1/3 + 1 2/3 3 5/6 + 4 3/6 4 6/10+ 5 7/10 1 1/6 + 3 5/6 2 4/9 + 6 7/9
January 31, 2013

Math
Estimate each sum and difference. 3 1/4 + 2 5/6 5 6/9 - 1 3/4 5 5/13 + 8 3/5 11 - 6 3/7 + 2 2/5
January 30, 2013

Math
Estimate each sum and difference. 3 1/4 + 2 5/6 5 6/9 - 1 3/4 5 5/13 + 8 3/5 11 - 6 3/7 + 2 2/5
January 30, 2013

Algebra 2
How do the graphs of y=1/x and y=5/x+6 compare?
January 30, 2013

Chemistry (Biochem)
I'm given two pictures looking down the alpha helices of a coiled coil dimer of alpha-keratin. I'm asked to identify three statements out of the following that are true. My guesses are 2, 3, and 6. 1. Leu-Glu-His-Val-Cys-Lys-Ser is a likely repeat in the α helix ...
January 27, 2013

physics
If Santa were in the elevator at the North Pole - where the earth's radius is less than at the equator - he is closer to the center of the earth and would therefore weigh more.
January 25, 2013

Physics
A 50.0 g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 17.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval? (...
January 24, 2013

Math
How do I solve this math problem. -10+ V_=-3. 2
January 23, 2013

Math
How do I solve this math problem. -2-10a=158
January 23, 2013

Math
How do I go about solving this math problem. -172=-1-9p
January 23, 2013

Math
I have a word problem with fractions. Anna estimated that her brother Nick ate about 1/3 of an apple pie, her brother Matt ate 5/8 of the pie, and she ate about 1/4 of the pie. How might you convince Anna that her estimates do not make sense? Be sure to show every step of your...
January 23, 2013

Physics
A football is kicked 65 m. If the ball is in the air for 4.3 s, find its horizontal velocity vx. Enter m/s as unit and use g = 10. m/s2. What is its initial vertical velocity vy? Enter m/s as unit. With what initial speed was the football kicked? Enter m/s as unit.
January 22, 2013

Physics
Harry and Hermione look from their balcony to a swimming pool below that is 12.0 m from the bottom of their building. They estimate the balcony is 30.0 m high and wonder how fast they would have to jump horizontally to succeed in reaching the pool. What is your answer? Enter m...
January 22, 2013

Physics
Brittany throws a slingshot pellet directly at a target that is far enough away to take 0.190 s to reach. How far below the target does the pellet hit? Enter m as unit. How high above the target should she aim? Enter m as unit.
January 22, 2013

Physics
A car sits in the parking lot. Above is a cargo plane, flying horizontally at 61 m/s. At the exact moment the plane is 182 m directly above the car, a crate accidentally falls from its cargo doors. Relative to the car, where will the crate land? Enter m as unit and use g = 10...
January 22, 2013

Physics
Bert is standing on a ladder picking apples in his father's orchard. As he pulls each apple off the tree, he tosses it into a basket that sits on the ground 2.2 m below at a horizontal distance of 1.3 m from Bert. How fast must Bert throw the apples (horizontally) in order...
January 22, 2013

Physics
A ball rolls off the edge of a balcony at 8.0 m/s. Find its speed after 3.8 s in the air. Use g = 10. m/s2 and enter m/s as unit.
January 22, 2013

Physics
In her physics lab, Jessica rolls a 20-g marble down a ramp and off the table with a horizontal velocity of 1.10 m/s. The marble falls in a cup placed 0.44 m from the table's edge. Find the table's height. Use g = 10. m/s2. Enter m as unit.
January 22, 2013

chinese grammar
§Ú们礼»ª¦a©Ú绝¦oªº­n¨D
January 19, 2013

Science
i belieeve you are working on penn foster :P if you are, you should email me and we can work together on it, im actually almost done with it. my email is rvargas @ live (dot) com. sorry, had to put it that way, cant post email addresses aparently :0
January 14, 2013

Chemistry
An aqueous solution of ethanol is 14.1M C2H5OH. The density of the solution is 0.853g/mL. What is molality of ethanol in the solution? What is mass % of ethanol in solution? I got the molality which is -21.7 ethanol, but I can't figure out how to get the mass % from the ...
January 14, 2013

English
A restrictive clause is one that A. usually occurs at the beginning of a sentence. B. limits the meaning of the word it describes. C. should be set off by commas. D. functions as an adverb.
January 9, 2013

algebra
81x^5 - 3x^2
January 9, 2013

Statistics
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II. Each value in the first...
December 18, 2012

Statistics
The game of chuck-a-luck consists of rolling 3 dice. The player picks a number, 1, 2, 3, 4, 5, or 6. Winning and losing depends on the number of times the number appears on the top of each die. If the number appears once then the winnings are equal to the bet. If the number ...
December 18, 2012

maths
Find the probability of drawing a diamond card in each of the consecutive draws from a well shuffled pack of cards,if the card drawn is not replaced after the first draw
December 14, 2012

math
Thank you ,I think I chose that answer but I did erase at one time and chose 4/5.Find out soon enough ,working on GED and it has been some years.
December 7, 2012

math
1/5
December 7, 2012

math
those were my choices
December 7, 2012

math
If I have 25 balls in a bowl 10 black,5 blue ,5 green ,5 red . what is the probability of me pulling out a red? 1/5 ,4/5,2/10,1/25 etc....
December 7, 2012

Physics
A shear force of 3.1 105 N is applied to an aluminum bar of length L = 19 cm, width w = 5.2 cm, and height h = 2.3 cm as shown in the figure below. What is the shear deformation Äx?____m
December 5, 2012

Steve help pleaseeeee
square root of 5
November 28, 2012

Algebra 2 help please :)
What is a cubic polynomial function in standard form with zeros 1, –2, and 2? Use synthetic division to find P(3) for P(x) = x^4 – 6x^3 – 4x^2 – 6x – 2. Divide 3x^3 + 3x^2 + 2x – 2 by x + 3 using long division. Divide using synthetic division. &#...
November 27, 2012

Algebra 2 help :)
Any number in the form of a+-bi , where a and b are real numbers and b not equal 0 is considered a pure imaginary number. TRUE OR FALSE The minimum value is the smallest y-value of a function. T RUE OR FALSE i2 = square root of -1. TRUE OR FALSE Complex numbers can be graphed ...
November 20, 2012

Algebra 2 help!!!
What value completes the square for the expression? x2 + 14x Use the quadratic formula to solve the equation. x2 – 7x – 6 = 0 Simplify the expression. (–2i)(8i) What are the solutions? 1/2x^2 + 2x + 3 =0 I need help
November 20, 2012

Algebra 2
Can you double check my answer The lengths of the sides of a rectangular window have the ratio 1.6 to 1. The area of the window is 2,560 square inches. What are the dimensions of the window? (1 point) 50.6 inches by 50.6 inches 40 inches by 64 inches 40 inches by 80 inches <...
November 18, 2012

HELP ! Algebra
Solve the quadratic equation by completing the square. (-x^2 + 6x + 10 = 0)
November 16, 2012

HELP !!! Algebra 2
15. What is the solution of the linear-quadratic system of equations? {y = x^2 + 5x - 3} {y - x = 2}
November 16, 2012

Statistics
@John I have come from a year later to reply to your concern, to uproot this tyranny that is Math Guru. No longer shall we sit wondering what the other half of the question is. No longer must we be given a formula and have to solve it out. NO LONGER MUST WE SIT THROUGH THIS. ...
November 5, 2012

Statistics
I got only love for John. The answer is fate
November 5, 2012

physics
Since the masses stick together, there is conservation of momentum but no conservation of energy. Let x be the new velocity. Hence, 0.5*0.4 + 0.8*(-0.20) = (0.5+0.8)*x X = (0.2-0.16)/1.3 = 0.0307 m/s KE = 0.5*1.3*0.0307^2 = 0.000615 J.
October 30, 2012

Science
While traveling along a highway a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile's acceleration? How would I show the work and find this answer?
October 29, 2012

Algebra 2
3. Identify the vertex and the axis of symmetry of the graph of the function y = 3(x + 2)2 – 3. (1 point) A- vertex: (2, –3); axis of symmetry: x = 2 B- vertex: (–2, –3); axis of symmetry: x = –2 C- vertex: (2, 3); axis of symmetry: x = 2 D- vertex...
October 25, 2012

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