Friday
October 24, 2014

Posts by Zac


Total # Posts: 122

Physics
A skateboarder moving at 7.18 m/s along a horizontal section of a track that is slanted upward by 48.5 ° above the horizontal at its end, which is 0.741 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring ...
October 16, 2014

math
A and B weigh 156 pounds. A and C weigh 171 pounds. How much do they each weigh if the total weight is 255 pounds?
September 16, 2014

math
Is 16.6 a rational number
August 27, 2014

Calculus
State the cartesian equations of two lines that make angle of 60 degrees with the line r=(1,3)+s(1,1)
July 29, 2014

Calculus
Find the scalar equation of a plane that is perpendicular to plane r=(-2,1,3)+s(0,1,1)+t(-1,0,3) and also intersects it along the line (x-3)/2=(y+1)/-3,z=1
July 29, 2014

Math
The denominator of a fraction is four more than twice the numerator. If both numerator and denominator are increased by six, the simplified result is 7/13. Find the original fraction
February 24, 2014

statistics
Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...
November 17, 2013

statistics
A random sample of 100 students from a high school was selected. If a 98% confidence interval estimate for the mean age of students is calculated to be 14.2511 to 14.9489, then the standard deviation of the sample mean is?
November 17, 2013

statistics
A management consultant has analysed a random sample of 40 large firms in order to investigate the mean annual salary of sales managers. She has constructed the following 90% confidence interval for the population mean annual salary: $45,382 to $48,618. In testing the ...
November 17, 2013

statistica
A management consultant has analysed a random sample of 40 large firms in order to investigate the mean annual salary of sales managers. She has constructed the following 90% confidence interval for the population mean annual salary: $45,382 to $48,618. In testing the ...
November 17, 2013

Chemistry
How many sulfate ions are there in 2.500 mL of 5.0 x 10-15 moles of Cr2(SO4)3?
September 22, 2013

math
integers of 34 Add= Sub.= div.= multiply=
September 9, 2013

Chemistry
A student begins with 25 mL of a 0.434 M solution of HI and slowly adds a solution of 0.365 M NaOH. 1. What is the pH after 15.00 ml of NaOH solution has been added? 2. What is the pH after 40 ml of NaOH solution has been added?
June 3, 2013

Chemistry
Claculate the voltage of the following cell at 25 Degress Celcius. 2Ag (aq) (0.010M) + Cu(s) -> Cu^2(aq)(0.1M) +2Ag(s)
June 3, 2013

algebra
identify conic section, its lines of symmetry and the domain and range
April 17, 2013

calculus
Show that ln(4+x) is the sum of its Taylor Series for -2 <= x <= 2.
February 27, 2013

physics
A point charge of -4.00 is at the origin, and a second point charge of 6.00 is on the axis at = 0.850 . Find the magnitude and direction of the electric field at each of the following points on the axis. a) x=25.0cm b) x=1.10m c) x=-15.0cm
February 10, 2013

math
First put the perpendicular line equation into y=mx+b form. Your first step should be to subtract the 10y from both sides. Then using the y = mx + b equation, you know the slope of the parallel line. Your line is perpendicular to the m value in the new equation. To find the ...
February 8, 2013

calculus
The z is supposed to be an upside down y (thats the best description I can think of).
January 15, 2013

calculus
For what values of z will (2-z)-y = 0 4x+(1+z)y = 0 have an infinite number of solutions.
January 15, 2013

calculus
Find the parametric equations for the line that contains the point (3,1,-4) and is parallel to the line r(t)=(1+2t)i+(-3-t)j+(5+5t)k
January 15, 2013

calculus
Find parametric equations for the line that is perpendicular to the plane 2x-y+3z=7 and intersects the plane when x=1 and y=1.
January 15, 2013

Pre-Calc
Given the one point function (3,9) (in other words f(3)=9) Identify the following transformations f(2x) -3(f(x-4))+1 f(5x+3) 4f(-x)
January 6, 2013

Pre-Calc
Thanks a lot for your help
January 6, 2013

Pre-Calc
wouldnt the "1"in the 1+.... in the 4th step become r^2 when you multiply both sides by r^2.
January 6, 2013

Pre-Calc
Convert r=1+3sin2x from a polar equation to a rectangular equation.
January 6, 2013

math
The principal of Valley Elementary School wants to divide each of the three fourth-grade classes into small same-size groups with at least 2 students in each. If the classes have 18, 24, and 36 students, respectively, what size groups are possible?
December 20, 2012

math
how long to the nearest year will it take an investment in germany to double its value if the interest is compunded every six months
October 21, 2012

math
the high of a trapezoid is 10ft the upper base is 6ft shorter then the lower base if the area of the trapezoid is 50 square ft how long is the upper and lower base?
October 1, 2012

algebra 1
place parenthesis so answer = 14. 2x2+3 to 2nd power-4+3x5.
September 14, 2012

Physics
A 140 g, 90.0 mph fastball comes across the plate very nearly horizontally and is batted at 90.0 mph at a 30.0 O angle (above the horizontal) toward center field. (a) Determine the impulse (in N.s) acting on the ball. (b) If the impact time is 0.00080 s, determine the average ...
August 3, 2012

Physics
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, also to the east. If Sally’s mass is 65 kg, what is the speed of the boat as she walks along?
August 3, 2012

physics
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, also to the east. If Sally’s mass is 65 kg, what is the speed of the boat as she walks along?
August 3, 2012

Physics
In the Daytona 500 car race in Daytona, FL, a curve in the oval track has a radius of 316 m (near the top of the curve) and is banked at 31.0 O . a) What speed would be necessary to make this turn if there was no friction on the road? b) If the coefficient of static friction ...
July 26, 2012

Physics
A popular carnival ride consists of a large, round room that rotates fast enough that any person standing against the wall will be stuck there, even as the floor is dropped away from their feet. The coefficient of static friction between the person and the wall is μs , ...
July 26, 2012

Physics
The Hubble Space Telescope (HST) has recorded evidence of a black hole at the center of the M87 galaxy. Using Doppler data, it's been measured that matter is orbiting the center of this galaxy at an orbital speed of 7.5x10 5 m/s, out at a radius of 5.7x10 17 m. Calculate ...
July 26, 2012

Physics
Assume the Earth is a perfect sphere of radius 6,400 kilometers. Find the weight of a 75.0 kg person at the North pole. Find the weight of this same person at the equator. (You don't need to use Newton's Law of Gravitation but you do need to analyze the radial/...
July 26, 2012

Physics
Starting from rest, a 6.70 kg object falls through some liquid and experiences a resistive (drag) force that is linearly proportional to the velocity of the object. It's measured that the object reaches half its terminal speed at 4.50 s. a) What is the terminal speed for ...
July 26, 2012

Physics
A car with fuzzy dice hanging from the rear view mirror by a single string drives along at a constant 25.0 m/s. a) If the dice have a mass of 0.030 kg, what is the angle of the string (relative to vertical)? b) What is the tension in the string? c) As the driver takes a turn ...
July 26, 2012

Physics
Consider a spider walking from the top of a (stationary) beach ball. (Let that angular position = 0 O .) The spider finds it loses its grip when the normal force between it and the surface is less than 1/2 of its weight. At what angle does this slipping begin?
July 26, 2012

Physics
A block of mass m = 2.00 kg rests on the left edge of a block of mass M = 8.00 kg. The coefficient of kinetic friction between the two blocks is 0.300, and the surface on which the 8.00- kg block rests is frictionless. A constant horizontal force of magnitude F = 10.0 N is ...
July 25, 2012

Physics
Mass 1 and mass 2 are connected as shown by a massless, non-stretch rope that passes over a massless, frictionless pulley. The masses are on inclines which have friction. When the angles of the string are as given, mass 1 experiences an acceleration up the incline of 1.00 m/s/...
July 25, 2012

Physics
A 12.0 kg block sits on a frictionless table. On top of this block is placed a 5.00 kg block. The coefficient of static friction between the two blocks is 0.70. a) What is the maximum force that can be applied horizontally to the 5.00 kg block before it slips? b) What is the ...
July 25, 2012

Physics
A 90.0 kg block and a 40.0 kg block are connected by a rope that passes through two (frictionless, massless) pulleys as shown. When released, what is the acceleration of the larger block? What is the tension in the rope?
July 25, 2012

Physics
A box starting from rest, slides down an incline which makes an angle of θ above the horizontal. The incline has a maximum height of h above the platform on which it sits which is itself H above the ground. The box leaves the end of the ramp and platform's edge and ...
July 25, 2012

Physics
An ice skater slides (without pushing) across a frozen pond for 25.0 m before coming to a stop. If the coefficient of kinetic friction is 0.050, how fast was the skater initially moving?
July 24, 2012

calculus
A trough has a trapezoidal cross section with a height of 5 m and horizontal sides of width 2.5 m and 5 m. Assume the length of the trough is 14 m. How much work (in joules) is required to pump the water out of the trough (to the level of the top of the trough) when it is full...
July 23, 2012

Physics
I understand but you didn't put 10(initial height) into any of the equations?
July 14, 2012

Physics
Sally Sue is atop a 10.0 m high platform where she will drop an apple straight down. On the ground below, and 20.0 m (horizontally) away, Betty Lou will shoot an arrow at the apple. If Betty's arrow has a release speed of 25.0 m/s, at what angle must she fire that arrow, ...
July 14, 2012

Physics
Seawater has a bulk modulus of 2.34×109 N/m2. Its density at 5°C is 1030 kg/m3. What is the speed of sound through seawater at this temperature?
June 16, 2012

math
kevin had a board that was 5 and 1/4 feet long. while making making a fence, he cut a peice 3 and 3/4 feet long from the board. what was the lenth of the peice of board remained?
May 7, 2012

algebra 2
List all possible rational zeros of each function. f(x)=4x^5+4x^2-9 Find all rational roots of each function f(x)=2x^3+x^2+8x+4
May 5, 2012

algebra
find all the zeros of each function. 1. f(x)=2x^4-13x^3-34x^2+65x+120 2. f(x)=4x^4+19x^2-63
May 5, 2012

Chemistry
0.200 moles of NaF are added to 1L 2.0 molar HF. The Ka = 7.2*10^-4. What is the pH? a) 2.14 b) 6.70 c) 10.80 d) 3.00 e) 7.00 I got 4.14. pH = -log(Ka)-log([NaF]/[HF]) ==> pH = -log(7.2*10^-4)-log(.2/2) ==> pH = 4.14 Or did I do something wrong?
April 29, 2012

Chem (please read soon)
50.0mL of 0.1 molar NaOH is added with 50.0mL of 0.1 molar CH3COOH. The Ka = 1.8*10^-5. what is the pH of the solution? a) 7.00 b) 9.22 c) 4.77 d) 8.22 e) 5.78 I think that the answer is d. Would i be safe in saying that?
April 29, 2012

Chemistry
0.200 moles of NaF are added to 1L 2.0 molar HF. What is the pH? a) 2.14 b) 6.70 c) 10.80 d) 3.00 e) 7.00
April 29, 2012

Chemisty (please read soon)
which will become a buffer in 1L of H2O? a) 0.3 mole KOH & 0.3 mole HBr b) 0.5 mole NH3 & 0.5 mole HCl c) 0.2 mole NaCl & 0.3 mole HCl d) 0.2 mole NaOH & 0.2 mole HBr e) 0.4 mole HC2H3O2 & 0.2 mole NaOH I think that the answer is e. Is that correct?
April 29, 2012

Chemistry
50.0mL of 0.01M Ba(OH)2 is added to 150.0mL of 0.01M HNO3. What is the new pH of the solution?
April 29, 2012

calculus
A stone is thrown straight down from the edge of a roof, 750 feet above the ground, at a speed of 7 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 5 seconds later? B. At what time does the stone hit ...
April 26, 2012

english
Main Idea: The big rivers in the center of the United States have a constant power that is greater than the human uses for the rivers. I need to provide 3 supporting details for main idea.
April 25, 2012

Statistics
5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What percentage of exams will have scores between 89 and 92? ...
March 5, 2012

physics
A hawk flies in a horizontal arc of radius 15.7 m at a constant speed of 3.8 m/s. Find its centripetal acceleration. Answer in units of m/s 2 006 (part 2 of 2) 10.0 points It continues to fly along the same horizontal arc but increases its speed at the rate of 1....
February 2, 2012

geography
I would like your help please? The United Kingdom is currently experiencing one of the most severe financial situations for decades. Many Large scale Government development plans have been scraped. The attention of politican is turning to an ongoing project for many years ...
January 19, 2012

Physics
How long does it take a 23 kW steam engine to do 8.8 x 10^7 J of work?
January 4, 2012

differential equations
Solve the following equation explicitly by expanding up to order x5, the following 2nd order diff equation. y''(x) = (1 + x^2)*y(x) pls show working y =f(x)
November 29, 2011

Cal
Express the given quantity in a single logarithm. ln(a + b) + ln(a - b) - 2 ln c
October 5, 2011

Math
graph each linear function. y= -x + 4 y= 2/3x + 1 y= 2x + 1 y = -1/2x + 3
April 24, 2011

math
How many possible outcomes are there for 15 coins tossed simultaneously?
April 17, 2011

science
An abiotic factor that starts with c and the clue is soil type. So what is a soil type that starts with C?
April 4, 2011

math
-3/8 less or gereater than -1
February 24, 2011

math
is -3+(-3) less than or greater than -6
February 24, 2011

math
i get it now
February 24, 2011

math
is 10^2 less thans or greater than -200?
February 24, 2011

Physics
A 86.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 5.50 m. What is the work done on the man by each of the following forces?
February 11, 2011

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together? This the ans 2 hours and 24 minutes but how did they work it out?
January 26, 2011

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together? This is the ans. 2 hours and 24 minutes But how they work it out?
January 26, 2011

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
January 26, 2011

MATH
Find each percent of markup. (a) The wholesale price is $34. The retail price is $42.50.
January 19, 2011

us history
what events led to u.s. expansion during 1895-1920?
January 10, 2011

algebra 2
Which binomial is a factor of f(x) = x4 - 27x2 -14x + 120? (x-4) (x-2) (x + 5) (x + 6)
January 10, 2011

algebra 2
Which binomial is a factor of f(x) = x4-27x2-14x + 120?
January 10, 2011

algebra 2
thank you this make way more since now
January 10, 2011

algebra 2
oh sorry x3-4x2-3x+18=0
January 10, 2011

algebra 2
Factor x3 4x2 3x + 18 = 0, given that 3 is a zero.
January 10, 2011

algebra
yeh but my homework has +-2 and +-1 as answers abd i can only choose one
January 10, 2011

algebra
x3 + 8x2-x-6 = 0?
January 10, 2011

algebra
According to the rational root theorem, which is not a possible rational root of x3 + 8x2 x 6 = 0?
January 10, 2011

chemistry
25 ml HCl x 1L/1000mL x .200HCl/1L = .005 mol HCl. Using the balanced equation from this, how many moles of NaOh will you need to completely neutralize the HCl?
November 10, 2010

PHYSICS
A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0170 s. The average force exerted on him by the ground is +16500. N, where the upward direction is taken to be the positive direction. ...
October 21, 2010

PHYSICS
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the blade is 69.0 kg/s. ...
October 21, 2010

PHYSICS
A model rocket is constructed with a motor that can provide a total impulse of 25.5 N · s. The mass of the rocket is 0.213 kg. What is the speed that this rocket achieves when launched from rest? Neglect the effects of gravity and air resistance.
October 21, 2010

algebra
a public television station set a goal of $350,000 in pledges during a certain month. the total pledged was $525,000. What percent of the station's goal was reached?
October 9, 2010

physics
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 26 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 135 m), the block swings toward the outside of the ...
October 6, 2010

arithmetic
0.2 in extended form
September 22, 2010

physics
A jogger accelerates from rest to 2.7 m/s in 2.2 s. A car accelerates from 39.0 to 44.0 m/s also in 2.2 s. (a) Find the acceleration (magnitude only) of the jogger. (b) Determine the acceleration (magnitude only) of the car. (c) Does the car travel farther than the jogger ...
September 7, 2010

physics
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.2 m/s in 1.9 s. Assuming that the player accelerates uniformly, determine the distance he runs.
September 7, 2010

physics
An 18-year-old runner can complete a 10.0 km course with an average speed of 4.51 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.31 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time...
September 3, 2010

math
What is the mean mediam and mode for 64,75,62,90,81,52,80,99,100,65,75,61,0,106,72,70,80,92,90,102
May 11, 2010

algebra 2
A bag contains 4 white marbles, 3 red marbles, 2 green marbles, and 1 yellow marble. what is the probability of reaching in the bag and randomly choosing a white marble?
March 15, 2010

math
how do i write 53 hundredths as a decimal.
February 2, 2010

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