Sunday
November 23, 2014

Posts by Ben


Total # Posts: 713

Physics
A plane designed for vertical takeoff has a mass of 6.4 ✕ 103 kg. Find the net work done by all forces on the plane as it accelerates upward at 8.4 m/s2 through a distance of 30.0 m after starting from rest.
November 20, 2014

Physics
A skier of mass 67.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 59 m up a 32° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
November 20, 2014

math
i have 50 coins in quarters and nickels. if the total value is $5.90, how many of each coin do i have ?
November 18, 2014

Chemistry Physics
yes I noticed it, but its still the right setup. thanks
November 17, 2014

Chemistry Physics
=6072btu thank you for clearing this up, really appreciate all the help.
November 17, 2014

Chemistry Physics
thanks 144 BTU/lb is the heat fusion of water and ice and the specific heat for ice is 0.51BTU/lb So would I need to set it up Q1 like this? 0.51*33.0*144
November 17, 2014

Chemistry Physics
I got it all wrong, confusing the tables But for Q1 Q1=0.51*33.0*80cal/kg (not sure how to convert to BTU)
November 17, 2014

Chemistry Physics
on q2 I mean (72-32)
November 17, 2014

Chemistry Physics
So,is this the setup to find heat? q1= 33.0 X 3.35X10^5 q2=2.26X10^6*1*(72-42)
November 17, 2014

Chemistry Physics
How many Btu of heat are required to melt 33.0 lb of ice at 32°F and to raise the temperature of the melted ice to 72°F?
November 17, 2014

math
2 bananas for 25 cent how many dose 6 cost
November 13, 2014

Physics Science
How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?
November 5, 2014

Physics
A 250 g piece of tin at 99°C is dropped in 100 g of water at 10°C. If the final temperature of the mixture is 20°C, what is the specific heat of the tin?
November 5, 2014

Physics - Method Of Mixtures
Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
November 5, 2014

Physics Science
Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
November 5, 2014

Physics Math
A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
October 30, 2014

Math Physics
Find the water pressure at ground level to supply water to the third floor of a building 8.00 m high with a pressure of 325 kPa at the third level So the given is h=8.00 Ptop=325kPa Density water = 1000 Would I need to set it up like 325+1000*9.81*8.00
October 28, 2014

Fluid Mechanics
Find the water pressure at ground level to supply water to the third floor of a building 8.00 m high with a pressure of 325 kPa at the third level So the given is h=8.00 Ptop=325kPa Density water = 1000 Would I need to set it up like 325+1000*9.81*8.00
October 28, 2014

Fluid Mechanics
What must the water pressure be to supply the second floor (18.0 ft/up) with a pressure of 50.0 lb/in² at that level?
October 27, 2014

Fluid Mechanics
Thanks
October 27, 2014

Fluid Mechanics
(a) Find the total force on the bottom of a cylindrical gasoline storage tank 15.0 m high with radius 23.0 m. (b) Find the total force on the side of the tank.
October 27, 2014

Physics Science
(a) Find the total force on the bottom of a cylindrical gasoline storage tank 15.0 m high with radius 23.0 m. (b) Find the total force on the side of the tank.
October 27, 2014

Calculus 1
Given f(x)= 3e^(1-x^2)*ln(x), find the equation of the tangent line at x = 1.
October 26, 2014

Calculus 1
A right triangle has a fixed base of length 6 meters and a height that is increasing at a rate of 2 meters/second. At what rate is the length of the hypotenuse increasing when the height is 8 meters?
October 26, 2014

math
How long will it take a car 3m long travelling at 100km/h to overtake a truck 10m long travelling at 50km/h, if the car is 10m behind the truck
October 15, 2014

College Chemistry lab
did you manage to solve this?
October 13, 2014

Math @Reiny
Did I do #2 right? 2.) (1-2i)/2i (1-2i)/2i = (1-2)/i x i/i = (1i-2i)/i^2 = (1i+2) =2+1i
October 8, 2014

Math
1.) If a = 2 and the vertex of a parabola is (3, -4), will there be a minimum or maximum value for the parabola? What is the value? 2.) If a = 2 and the vertex of a parabola is (3, -4), what is its axis of symmetry?
October 7, 2014

Physics-Intro
(massbullet * velocitybullet)/massgun (60.0 * 575/4.50) = 7666.66666 Which rounded off becomes 76.7m/s
October 7, 2014

Physics-Intro
A bullet with mass 60.0 g is fired with an initial velocity of 575 m/s from a gun with mass 4.50 kg. What is the speed of the recoil of the gun?
October 7, 2014

physics
A car travels along a straight stretch of road. It proceeds for 15.9 mi at 51 mi/h, then 25.3 mi at 41 mi/h, and finally 34.3 mi at 38.6 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h
October 3, 2014

physics
Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
September 30, 2014

physics
One ball is dropped from a cliff. A second ball is thrown down 1.00 s later with an initial speed of 40.0 ft/s. How long after the second ball is thrown will the second ball overtake the first?
September 30, 2014

physics
A bullet is fired vertically upward from a gun and reaches a height of 7000 ft. Find its initial velocity. How long does it take to reach its maximum height? How long is it in flight?
September 26, 2014

Physics
A rock is dropped from a bridge to the water below. It takes 2.40 s for the rock to hit the water. Find the speed (in m/s) of the rock as it hits the water. How high (in metres) is the bridge above the water?
September 26, 2014

Math (Pre-Calculus)
@bobpursley How did you get 3 and 5?
September 18, 2014

Math (Pre-Calculus)
Can someone help me with this? Thanks! Find the zeros of the function algebraically. f(x)=x^2-8x+15 ---------------- 10x
September 18, 2014

Physics
When I work this problem I get an answer different from what's given not sure why? A basketball is launched with an initial speed of 8.8 m/s and follows the trajectory shown. The ball enters the basket 0.98 s after it is launched. What are the distances x and y? Note: The ...
September 14, 2014

Calculus
Using the definition of derivative state the function, f(x) and the value of a for lim as h->0 of (square root of (121+h) -11)/h
September 7, 2014

Math
Olivia's chessboard is 11 sq centimeters. A chessboard. Has 8 sq on each side. To the nearest tenth what is the width of the chessboard
September 2, 2014

Algebra
It should be on your formula sheet if not then look it up.
August 24, 2014

Algebra
Use the distance formula.
August 24, 2014

Algebra 2. Please Help Someone!!
an airplane's altitude is 100 feet as it descents for a landing on a runway whose touchdown is 5000 ft away. Let the x-axis represent the ground and the y-axis represent the airplane's altitude. What is the slope of the airplane's descent? What is the y-intercept ...
August 24, 2014

maths
A man uses a fifth of his income on his rent,a third on education and one half of the remainder on clothing. (A) what fraction of his income does he spend on clothing? (B)How much does he spend on clothing,if his income is $2,000,000?
August 4, 2014

Math
A model airplane is shot up from a platform 1 foot above the ground with an initial upward velocity of 56 feet per second. The height of the airplane above ground after t seconds is given by the equation h=-16t^+56t+1, where h is the height of the airplane in feet and t is the...
July 24, 2014

Math
Solve the following quadratic-linear system of equations. y=-x^2-x-6 y=2x-2 A. (3, 6) and (–1, 2) B. (4, 6) and (–1, –4) C. (3, –6) and (2, 4) D. (–4, 3)
July 24, 2014

science
Calculate the volume of a graduated cyclinder that has a radius of 10 mm and a height of 120 mm.
July 15, 2014

math 8th grade
what the answer to the worksheet how does a hawaiian baritone?
May 21, 2014

Math
A spinner numbered 1-10 is spun. what is the probability of spinning a multiple of 3 and a multiple of 2?
May 11, 2014

Steps in Chemistry
add lime. plot sections for water, lime and salt to compare.
May 8, 2014

econ
What percentage of GDP in 2000 is consumption Calculate net exports for 2001. (Express your answer in billions of dollars.)
April 7, 2014

health
I got B
April 2, 2014

health
A was correct for me
March 29, 2014

physics
a car traveling at 43m/s decelerates at a rate of 7.1 m/s squared. how long did it take the car to stop? what distance did the car travel while stopping?
March 27, 2014

Health
As mixed-doubles teammates in tennis, Kara and Tran are trying to devise their best strategy against an opponent that has two excellent servers but his physical fitness level is not as good as Kara and Trans. How can Kara and Tran use their superior cardiovascular endurance to...
February 25, 2014

physics
A spring of force constant 655 N/m is used to launch a 5.25 kg mass from the edge of a frictionless table that is 1.20 m above the floor. How far horizontally away from the table will the mass land if the spring was compressed 42.0 cm before launching?
February 13, 2014

Chemistry
how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?
February 6, 2014

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
January 30, 2014

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
January 30, 2014

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
January 30, 2014

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
January 30, 2014

Health
The coach noticed that Caleb really started to kick the soccer ball with great amount of power after the kicking drills. Caleb adjusted the power of his soccer kick by increasing the speed of his kicking leg prior to and upon contact with the ball starting his kick from a two ...
January 30, 2014

Physics
A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto ...
January 27, 2014

science
if 4 cars were going 100m the entire time what happens to speed,velocity and accelerationas one car completes one full lap
January 23, 2014

science
What is the acceleration of a 7kg rocjet if a force of 68.6 kg m/s/s (N) is used to move it away from the earth
January 21, 2014

science
NOT RIGHT!!! 2 is C
January 21, 2014

American History
What three rivers did Lewis and Clark use to get to the Pacific Coast?
January 13, 2014

Atomic Model/Science
I dislike Chemistry :O Anyway I do know this: For an atom, the number of natural occurring protons should have the same number of electrons. So your atom should have 92 electrons given if it's not an (ion or man made isotope).
January 11, 2014

Science
Let: Star = Sun Planets = Earth It's much simpler to understand the question with what we know. Now to answer your question: The gravity of the Sun keeps the earth in it's orbit. This is also true as the Moon orbits the Earth because of the pull of Earth's gravity...
January 11, 2014

Honor's English
Thank you :-).
January 11, 2014

Honor's English
Which of the following describes the underlined phrase in the sentence below? The local softball team won the championship (against all odds). A) prepositional B) participial C) gerund D) infinitive Process of elimination: It cannot be C since a gerund needs to have -ing at ...
January 11, 2014

HEALTH
I got B. 6
January 10, 2014

alegbra
Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually? My answer is $20,559.34, however, the module says its incorrect.
December 11, 2013

Math
Sam starts from point A at 8:00am and hikes up a mountain path. He arrives at the top, (point B) at 4:00pm. He camps there for the night and the following morning he starts his descent at 9:00am. He travels faster since he goes downhill and arrives at the bottom (point A) at 3...
December 2, 2013

Math
If the measurement from the outer edge of the first board to the outer edge of the last board is 144 inches, then there would be 14 spaces between the boards, each measuring 3/8 inch. (14x3/8)+(15x9 1/4)= 144. Now if this section is in the middle of the boardwalk, there would ...
December 2, 2013

math
(15x1000)/60=250
December 2, 2013

science
For BOD5 test 1) Why water samples needed dilution? 2)How to check the test accuracy? 3)Under what conditions, the water sample needs "seed"? anyone can help?please.
December 1, 2013

science
How to eliminate chloride interference up to the COD test?
December 1, 2013

Statistics
I have two coins: a quarter and a nickel. The quarter has a bias of 1/4 for heads, and the nickel has a bias of 2/3 for heads. I flip each coin 10 times. What is the probability that I observe exactly five heads total? Some explanation of the solution would be appreciated.
November 29, 2013

Physics
i caught you
November 28, 2013

algebra
Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually?
November 16, 2013

High School Geometry
I am have a hard time understanding how A and B can be No, but C can be Yes on this problem i.imgur (dot)com/rpJQDf3.png I thought that since AD is not perpendicular to the plane m then no lines shooting off of D onto the plane could be perpendicular.
November 13, 2013

math
Oh thanks Ms.Sue! :)
November 7, 2013

math
If a car traveled 168 miles in 3.5 hours, what was the average rate of speed?
November 7, 2013

math
Thanks Ms.Sue.... you're awesome!
November 7, 2013

Physics
A 3.00-g bullet (c = 0.0305 cal/g . C° = 128 J / kg . C°) moving at 180 m/s enters a bag of sand and stops. By what amount does the temperature of the bullet change if 80% its KE becomes thermal energy that is transferred to the bullet? Thank ´s fir your help!
November 3, 2013

Statistics
your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is your percentile?
November 3, 2013

Statistics
Dear Lee, Please confirm these answers to this question. your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is ...
November 3, 2013

Statistics
a. 69 b. 40th percentile
November 3, 2013

Statistics
your medical terminology instructor listed the following grades for the class out of a 75 point test:<br /> 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70<br /> a.find the 90th percentile<br /> b. your score was 59, what is your percentile?<...
November 3, 2013

chemistry
5.34g of salt of formula M2SO4 (M is a metal)were dissolved in water. The sulfate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulfate (BaSO4) were obtained. a)How many moles of sulfate ion were precipitated as barium sulfate? b)How many ...
October 19, 2013

Chemistry
What is the purpose of adding 100 mL of distilled water to a beaker containing metal nitrate solution?
October 6, 2013

health
more
September 12, 2013

Physics
A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
September 3, 2013

Physics
Three sources of sound are distributed along a line, as shown in the figure. v is the speed of sound. Source A is at rest, and it emits sound waves with a frequency of 480 Hz. Source B is traveling at v/5 to the right, and it emits sound waves with a frequency of 960 Hz. ...
September 3, 2013

Physics
A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
September 3, 2013

maths simultaneous equations
3x + 5y = 1 4x + 7y = 2
June 18, 2013

Chemistry
Determine the theoretical and percent yield of hydrogen gas if 80.5 g water undergoes electrolysis to produce hydrogen and oxygen and 2.81 g hydrogen is collected. theoretical yield
June 16, 2013

Math
Value of $100.00 earning 8% compounding interest rate annually at the end of 10 years.
June 12, 2013

math
what percent of 30 is 40?
May 22, 2013

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