Thursday
December 8, 2016

# Posts by andy

Total # Posts: 906

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
July 17, 2013

Brilli the ant randomly placed a token into a square on a 2×100 chessboard according to a probability distribution P. The token is then moved uniformly at random to one of the horizontally, vertically, or diagonally adjacent squares. The probability that the token is in ...
July 17, 2013

math
Brilli the ant is considering the complexities of a 5-dimensional universe. She wants to count the number of integer points that are distance sqrt(n) away from the origin. Let Tn be the set of ordered 5-tuples of integers (a1,a2,a3,a4,a5) such that a1^2+a2^2+a3^2+a4^2+a5^2=n....
July 17, 2013

physics
Telephoto lenses allow one to "zoom in" on distant objects, making them bigger. A particular telephoto lens consists of a combination of two thin lenses having focal lengths of f1=20 cm and f2=−8 cm, respectively. The lenses are separated by a distance of d=15 ...
July 17, 2013

chemistry
Make the epoxide of the trans alkene with McPBA. Open with tributyl phosphine. This will intercept the Wittig mechanism (after rotation of the C-C bond bewteen the carbons baring the oxygen and phosphonium), and you will lose the phosphine oxide and form the cis alkene.
July 11, 2013

Maths
f(x)is a function differentiable at x=1 and f'(1)=1/8. what is the value of f(x)-f(1) f'(x) denotes the derivative of f(x)
May 24, 2013

Math
I mean 4 cups not 2 cups
May 23, 2013

Math
No because he has 2 cups. It doesn't equal a gallon. 1 gallon = 16 cups.
May 23, 2013

math
So far they have \$5000 in their fund. Timmy gave \$450. Donna gave \$900. How much did Kathy give? A. \$4550 B. \$4100 C. \$3700 D. \$365
May 23, 2013

math
Simplify.is what? 42 Ã· 6 + {1 · 7 - [7 + (6 - 1)]} A. 12 B. 2 C. 28 D. 14
May 23, 2013

math
Simplify. is What? 125 · 24 Ã· 6 + (8 - 1) A. 493 B. 509 C. 507 D. 500
May 23, 2013

math
Simplify. how can this be simplified? 42 Ã· 6 + {1 · 7 - [7 + (6 - 1)]}
May 23, 2013

math
Round 35,554,100 to the nearest ten thousand. is what Round 35,554,100 to the nearest ten thousand. A. 35,554,100 B. 35,550,000 C. 35,554,000 D. 36,000,000 ?
May 23, 2013

augusta teh
The sundae contained almost 40,741 pounds of ice cream and almost 10,580 pounds of syrup and topping. How many pounds did the sundae weigh?
May 23, 2013

Algebra
f(x) is a function differentiable at x=1 and fŒ(1)=1/8. What is the value of f(x)-f(1) f'(x) denotes the derivative of f(x)
May 21, 2013

math
If sin57=m Express the following 1. sin 237 2. Cos 33 3. Cos 3 4. Cos 66
May 19, 2013

math
Pls help
May 19, 2013

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know ...
May 14, 2013

matter
why is it important too descibe and compare matter
April 29, 2013

matter
why is it important too descibe and compare matter
April 29, 2013

Probabilities
Bibi wants to send invitations to some of her friends to come to her birthday party. She has contact information for 37 friends stored on her phone, but she only wants to invite 21 of those people to her party. She tries to send out a message to the 21 people, but her phone ...
April 25, 2013

Midpoint Help / Math
M(-4,-2) is the midpoint of RS. If S has coordinates (-2,5), find the coordinates of R.
April 23, 2013

landmark project
You can ask , What is the area of the Palace of Fine Arts ? Where is it located ? Who is the architect ?
April 23, 2013

Algebra
Suppose f(x) is some polynomial such that x−45 is a factor of f(x) . What value of x must be a root of f(x)=0 ?
April 19, 2013

Geometry
Circle G with center O is tangential to PA at A . Line PO extended intersects G at B (PO<PB ). C is a point on AB such that PC bisects angle APB .What is the measure (in degrees) of angle PCA ?
April 16, 2013

Quantum Physics
guess the right answer for 5a and don't forget to write CAPITAL K
April 16, 2013

Quantum Physics
Gyus, 5 is easier than you think! It takes exactly m steps from starting superposition (ay = 1/sqrt(K), ax = 1/sqrt(k)) to get to the solution (ay = 1, ax = 0), then it takes exactly m+1 steps to get back to initial state, but after each cycle the sign changes! So it looks ...
April 16, 2013

Statistics
The lifetime of computer chips is approximately normal with mean 1.4×106 hours and standard deviation 3×105 hours. The statistics department has 5 computers built with that chip as the main component. What is the probability that all 5 computers last longer than 1....
April 12, 2013

Geometry
Arpit is thinking of a 2-digit number where the tens digit is twice the ones digit. How many different numbers can Arpit be thinking of?
April 11, 2013

Geometry
ABC is a triangle with circumcenter O, obtuse angle BAC and AB less than AC. M and N are the midpoints of BC and AO respectively. Let D be the intersection of MN with AC. If 2AD=(AB+AC), what is the measure of angle BAC ?
April 11, 2013

World Geography
what is an area with one or more ccommon characteristics
April 5, 2013

computer programming
I need help with this problem please: Create the logic for a program that accepts input values for the projected cost of a vacation and the number of month until vacation. Pass both values to a method that displays the amount you must save per month to achieve your goal. Use ...
March 31, 2013

MATH
IF CATHY IS 24 YEARS OLD, HOW OLD WILL CATHY BE IN Y YEARS? Y - 24 Y + 24 24 - y 24 / Y
March 27, 2013

German
correct
March 25, 2013

Earth Science
If a sample contains 70g of Carbon 14 and 70g of Nitrogen 14, how many half lives has it undergone? (show all of your work)
March 21, 2013

algebra 1
A salesperson at a clothing store earns a 5% commission on all sales. How much commission does the sale person earn on a 300\$ sale?
March 7, 2013

Physics
Okay its like 98.8 or something...you have to convert miles per hour to meters per second. Then do (1/2)(Mass)(velocity) that'll give you your kinetic energy (work). Divide that by time to get Power. Remember, it gives you your answer in watts but Rawwaga's answers are...
February 28, 2013

Engineering Economy
What is the future worth of \$1,000 in month 1, \$1,040 in month 2, and amounts increasing by \$40 per month through month 12, at the end of year 2 if the interest rate is 23.7631528% per year, compounded continuously?
February 26, 2013

Physics
A mass is attached to a spring stretches it 2.5 cm from equilibrium. The mass is lightly tapped and set in an oscillation. What is the angular frequency of the of the oscillation?
February 19, 2013

Math
What is the minimum value of N that will make this statement true: If we pick any N composite numbers from 1 to 1000, then we can find 2 numbers whose greatest common divisor is not 1.
February 15, 2013

ENG1511
My cat is playful
February 15, 2013

Math (Pre-Cal)
The infinite series S = 1/5 + 3/5^3 + 5/5^5 + 7/5^7 + 9/5^9 + ... converges. Find S.
February 11, 2013

Physics
A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.95 s after leaving the dock has a magnitude of 6.7 m. What is the car's speed at the instant it drives off the edge of the dock?
February 9, 2013

physics
whaat happens to the potential energy lost by hammer of pile driver when it falls through a distance and drives a piling into the ground?
February 7, 2013

geometry
The measures of two consecutive angles of a parallelogram are in the ratio 5:4. What is the measure of an acute angle of the parallelogram?
February 3, 2013

Concrete on different temperature?
if a section of concrete is poured for a road and the engineer leaves no gap between sections poured before and after the section in question , what will happen to concrete if the temperature varies from 0 C to 40 C ? Assume that the initial temperature of the pouring was 17 ...
December 11, 2012

Mechanics of Materials
the propane gas tank has an inner diameter of 1500mm and wall thickness of 15mm. If the wall is pressurized to 2MPa, determine the absolute maximum shear stress in the wall of tank.
December 11, 2012

Math
If A represents the number of apples purchased at 15 cents each, and B represents the number of bananas purchased at 10 cents each, which of the following represents the total value of the purchases in cents? a) A+B b) 25(A+B) c)10A+15B d) 15A+10B
November 30, 2012

physics
A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third second?
November 14, 2012

Phyisics
Once a 26 kg crate is in motion on a horizontal ﬂoor, a horizontal force of 64 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s 2 . What is µk, the coeﬃcient of kinetic friction, between the crate and the ﬂoor?
November 13, 2012

Physics
A box of books weighing 328N moves with a constant velocity across the floor when it is paged with a force of 385N exerted downward at an angle of 25.3 below the horizontal. Find muK between the box and the floor
November 6, 2012

Physics
Consider the 56 N weight held by two cables shown below. The left hand cable is horizontal. What is the tension in the cable slanted at an angle of 38degrees
November 6, 2012

Physics
A 2.01 kg block starts from rest at the top of a 25.8degree incline and accelerates uniformly down the incline, moving 2.13m in 2.98 seconds. What is the magnitude of the acceleration of the block?
November 6, 2012

algebra
Suppose there are only enough tutors for 12 fifth graders to attend tutoring . What is the domain and range of the function in Y=.40x
November 4, 2012

Physics
Use the equation Pfluid=Density x height x gravity (1000)(1.9)(9.8)=18,620 The TOTAL absolute pressure on the bottom and against the sides of the swimming pool is 18,620 + 1.01x10^5 = 119,620 Pa Use the equation Pressure = Force/Area Rearrange the equation to Force = Pressure ...
November 3, 2012

elementary
I could've said how much more instead of how many. That would be more understanding for me.
October 29, 2012

LATIN
Obey the divine law and tell us the truth now! I need help translating these into Latin please
October 23, 2012

Calc
Thank you both for your help
October 23, 2012

Calc
Air pressure at sea level is 30 inches of mercury. At an altitude of h feet above the, air pressure, P, in inches of mercury, is given by, P =30e^(-3.23x10-5h) a)Find th equation of the tangent line at h=0. b)A rule of thumb is given by travelers is that air pressure drops ...
October 23, 2012

Calculus
Air pressure at sea level is 30 inches of mercury. At an altitude of h feet above the, air pressure, P, in inches of mercury, is given by, P =30e^(-3.23x10-5h) a)Find th equation of the tangent line at h=0. b)A rule of thumb is given by travelers is that air pressure drops ...
October 22, 2012

accounting
Okay so I need help Identifying the reporting issues in this case with references to the conceptual framework pyramid, such as revenue recognition, full disclosure, historical cost, etc. So this gym offers one year memberships. Members can use any of the facilities but must ...
October 22, 2012

Physics
max gravitational force=1.282 x min gravitational force. therefore, rmax^2/rmin^2=1.282 square root both sides
October 15, 2012

statistics - probability
A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a) What is the probability that 8 or fewer turn right? b) What is the probability that 8 or more turn right? c) What is the probability...
October 12, 2012

College US History
because god told them to
October 9, 2012

Physics
1. What is absolute uncertainty? (+one example) 2. What is relative uncertainty? (+one example)
October 7, 2012

Maths
Thank you ...
October 1, 2012

Maths
Hi, I am working on some Nth problems - can anyone tell me if this is correct :- Nth term sequence is n + 4 are the first three terms 5,6,7, A nth term is 85 - 5n are the first three terms of the sequence 17, 34, 51, A nth term is 2n - 0.5 are the first three terms of the ...
October 1, 2012

physics
Traveling at a speed of 18.3 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 0.540. What is the speed of the automobile after 1.33 s have elapsed? Ignore the effects of ...
September 18, 2012

physics
A 4.85-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.440. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
September 18, 2012

physics
A diver springs upward from a board that is 3.90 m above the water. At the instant she contacts the water her speed is 14.9 m/s and her body makes an angle of 60.3 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...
September 15, 2012

Physics
A car races at a constant speed of 25 m/s around a circular track with a radius of 150 meters. Consider 1/4 of a lap starting on the south side (heading east) and ending on the east side (heading north). A. How much time does the car take to travel between the two points? B. ...
September 9, 2012

Physics
The displisacement from A to B is 36 miles at 12 degress N of West. The displacement from B to C is 39 miles at 21 degrees N of E. What is the displacement from A to C by graphical means and by compnents?
September 9, 2012

physics
A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of ...
September 8, 2012

physics
Along a straight road through town, there are three speed-limit signs. They occur in the following order: 56 , 33 , and 24 mi/h, with the 33 -mi/h sign located midway between the other two. Obeying these speed limits, the smallest possible time tA that a driver can spend on ...
September 8, 2012

Physics
I am confused on how you got the 24km in part c. Could someone please explain that?
August 31, 2012

calculus
Thanks Much!
July 23, 2012

calculus
Compute the derivative for the following: n(x) = sin(x^3-5x^2+4x-7) Thanks, andy
July 23, 2012

calculus
If I figured out average velocity can I use that to figure instantaneous velocity? There is no function. Thanks
July 22, 2012

calculus
Well thanks again for the help...and I am probably older than you...hence the mind gaps of my own!
July 22, 2012

calculus
The question was 6-fold but the only part with the restriction was min and max values of y...everything else pertained to the original function.Thanks for staying with me...it's been a long day!
July 22, 2012

calculus
the original function was x^5-15x^3 +10 so when you figured the min and max with the restrictions and substituted 1, and 5 for the x's should you have included the constant 10? So I came up with (-4) and (1260), but forgive me I still don't know what that means...thes ...
July 22, 2012

calculus
So I am correct in my thinking the critical points are the (-3,175)(3 -152) because that was asked of the original function,.... because I only have to give only the max and min values for y if x is restricted to the interval {1,5}? Thanks again for all your help.
July 22, 2012

calculus
So I am ttinking the critical points are the (-3,175)(3, -152)
July 22, 2012

calculus
WOW! Thanks Much! Love that site you gave me and I totally understand and can plainly see it all except the max and min. I am seeing the max at (-3, 175) and the min at (3, -152) but does that satisfy "if x is restricted to the interval {1, 5)" because I thought that...
July 22, 2012

calculus
the graph (x^5-15*x^3 +10) is sketched without axes and not to scale. I found f'(x), set it to zero and got x=0, x=3, x=-3. these are critical numbers? I plugged them into original equation to find y (?) and got (0,10),3,-152)(-3, 172). I have to show for what intervals (...
July 22, 2012

calculus
Please help me solve. I think increase = concave up and decrease = concave down? On the graph y = x^5-15x^3+10 for x what intervals is the function increasing, decreasing, concave up and concave down. Plot the critical points, plot and label the inflection points. Solve for ...
July 21, 2012

math volume
a rectangular sheet of cardboard size 5' by 8' is to be used to make an open box by cutting out the four corners. What is the largest volume and be sure to explain how you found the MAXIMUM volume please and Thank You!
July 19, 2012

math
How many ways can 8 cars be parked in two big spaces? Three cars can fit in one and two can fit in the other.
June 29, 2012

physical edu
Inactivity is considered the nation’s most common cardiac threat. is it true
June 22, 2012

physical edu
Stimulant drugs cannot cause heart attack, stroke and sudden cardiac death. its true right? High blood sugars damage all the following, except ____ 1. the circulatory system, 2. kidneys (from processing too much sugar) 3. and stomach 4. and atherosclerosis. is it 4
June 22, 2012

physical edu
1. Cardiovascular disease is the number one overall killer of Americans – kills more than cancer, chronic respirator disease, accidents and diabetes combined! its False right? 2. Only 25% of Americans engage in physical activity at the intensity and duration needed for ...
June 22, 2012

physical edu
Motor vehicle accidents are the leading cause of death for people aged 4-33 years old. true right?
June 22, 2012

physical Edu
The rate of alcohol absorption is influenced by a. Body weight and emotional state. b. Gender and emotional state. c. Food intake and beverage preference. d. Speed of consumption and alcohol history. e. All of the above are correct. is it E
June 22, 2012

physical edu
CVD is the second leading cause of death for U.S. women. flase right?
June 22, 2012

Physical Edu
June 20, 2012

physical Edu
10. what exactly is peers? what does it mean? 11. level of school lets say colleges?
June 20, 2012

physical Edu
8. My peers are changing their sexual behavior because of AIDS. is it True 9. Condoms are not used much to prevent STDs on this campus. is it True 10. Because of AIDS it is easier for me to talk to my peers about sex. is it True 11. Schools should distribute condoms to ...
June 20, 2012

physical Edu
7. HIV infection is not a significant risk for college students. False right?
June 20, 2012

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