Posts by ben
Total # Posts: 1,050

Chemistry
What is the purpose of adding 100 mL of distilled water to a beaker containing metal nitrate solution? 
physics
a+b 
health
more 
Physics
A lightrail 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? 
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. ... 
Physics
A lightrail 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? 
maths simultaneous equations
3x + 5y = 1 4x + 7y = 2 
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 
Math
Value of $100.00 earning 8% compounding interest rate annually at the end of 10 years. 
math
what percent of 30 is 40? 
physics
Marks: 1 A car merges onto the highway from rest in 10 seconds. The final speed of the car is 60 mph. Estimate the acceleration of the car. 
Physics
An trapdoor is 0.91 m square, has a mass of 11 kg, and is hinged along one side with a latch on the opposite side. If the center of mass is located 0.1 m toward the hinged side from the center, what are the magnitudes of the forces on the latch and the hinge from the door? 
Chemistry
What is the pH of a solution that is 0.0100 M in HCN and 0.0200 M in NaCN? 
Math
If Ethan ate 4 times as many cookies as Daniel who at 2 times as many as Courtney how many cookies did Ethan eat if Courtney ate 2. 
health
I got B. 6 
HEALTH
Oops, that A was supposed to be D 
english
I really need 6 thick (hard) questions for Act 4 scene 13 "King Lear" by Shakespeare PLEASE THANK YOU 
LA
just tell me please 
LA
d? 
LA
is it A? 
LA
can you help witch one is it? 
LA
Which description best captures Abraham Lincoln's approach to slavery before he signed the Emancipation Proclamation? A;Lincoln was himself proslavery, but thought that states should have the right to choose whether or not slavery was legal. B;Lincoln was indifferent on ... 
LA
thanks 
LA
is it A please tell me 
LA
i think its A or D 
LA
10. How did the 1860 election contribute to the breakup of the Union? A;by electing a president many believed would not protect Southern rights B;by electing a proslavery president whom the North would not tolerate C;by allowing freed slaves to vote D;by electing a president ... 
physical science
The orbital velocity of an earth satellite in an orbit 400 mi above the earth? 
Chem
What will be the temperature of a 3.5 gram sample of carbon dioxide gas in a 2.5 liter container at .955 atm 
Physics
Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object. The heavier object will move .8 m down, the lighter will ... 
Physics
A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and ... 
physics
but how do you find the initial height? 
physics
Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object. 
chemistry
What is the percent by volume (% v/v) of a solution made by mixing 12 ml of ethanol (C2H5OH) with 48 ml of water? b) Assuming the density of ethanol is 0.789g/ml, what is the molarity of this solution? 
trig
cos è = 0.9659 A = ? H = 20 
Biomechanics
.4040 
Physics
2.60*17 
math
I don't understand 
Calculator Question
I have the same issue, no clue 
math
The ratio of mystery books to the number of science fiction books is 4:3. The number of scifi books to the number of biographies is 4:5. If there are 48 scifi books what is the total number of books 
chemistry
TO HAC SOLUTION (02M 100ml) we add NaOH (0.12M 80ml) what is the ph (answer: 4.71) 
consumer math
idk how to do it 
Physics
By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to 35C? The linear expansion coefficient is 105 per C. 
Engish 11
Consider what you have learned about American history during the period of 1860 to the early 1900s how do the stories in the realism and regionalism unit reflect what was going on in the country then 
problem solving
You purchased 18 karat gold chain that weights 15 grams. How much gold did you purchase in grams? In carats? (1 carat=0/2 grams) 
problem solving
Okay I was dividing by 3 instead of 9. Got it now, thanks. 
problem solving
You need to put a carpet in a rectangular room that measures 13 feet by 22 feet as a cost of $19.50 per square yard. Assuming that you can buy precisely the amount of carpet you need, how much will the carpet for the room cost? Demonstrate stepbystep solution. I got $1,858.... 
problem solving
Okay got it. Thank you.. 
problem solving
You wouldn't multiply that answer by 60 ? 36/45 is .8 
problem solving
Suppose your car gets 36 miles per gallon of gasoline, and you are driving 45 miles per hour. Using unit analysis, find the number of hours it takes to use 1 gallon of gas. I got 48 minutes but I'm not sure. 
problem solving
Thanks, got it! 
problem solving
Suppose that two current exchange rates are US $1= 117.9 Japanese yen and 1 Cuban Peso= $.0476. What is the value of 1 peso in Japanese yen? 
problem solving
Okay I got it now 
problem solving
I got two different answers from those two different solutions 
problem solving
Assuming that you breathe once in every 12 seconds, how many breaths do you take in 4 weeks? You must show the use of units. 
problem solving
Bathtub consumes more water, by 10.88 ft^3 
problem solving
Suppose water flows from a shower at a rate of 0.38 cubic feet per minute. Do you use more water by taking a 14minute shower or by filling a bathtub with 0.6 cub yards of water, and by how much? Demonstrate strepbystep solution. 
physics
a) Use the formula E = (1/2) I w^2, where w is the angular speed in rad/s and I is the moment of inertia. (b) Time = (Full speed energy)/Power You will have to convert horsepower to Watts when using the formula 
physics
Linc, the 65kg lifeguard, slides down a water slide that is inclined at an angle of 35 degrees to the horizontal, into the community swimming pool. If the coefficient of friction of the slide is 0.050, what is Linc's rate of acceleration as he slides down? Draw the free ... 
american government
2. In federalism, the national government (Points : 1) 
ratio and rate
I think you're missing the point here, Ms. Sue. Math problems do not always have to be scientifically accurate, at least in cases like these. 
Math
if josh gives Emily 7 apples, she will have 5 times as many apples as Josh. If Emily gives Josh 7 apples, they will have the same number of apples. How many apples does each currently have? 
Math
You are correct. 
AP U.S. History
How did the government under the constitution guarantee that people on the frontier would be loyal to it? What was the impact on Native Americans? 
AP U.S. History
How did the French Revolution highlight the differences between the Federalists and the Republicans? 
AP U.S. History
What diplomatic problems did the french revolution and the war that followed pose for the united states? How did Washington and Congress deal with this problem? 
Physics
A small 0.469kg object moves on a frictionless horizontal table in a circular path of radius 1.42 m. The angular speed is 6.31 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under... 
Chemistry
4 and 5 
physics
When jumping straight down, you can be seriously injured if you land stifflegged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 68.5kg man just before contact with the ground has a speed of 5.59 m/s. (a) In a stifflegged ... 
Mathsalgebraic expression
Using suitable identities evaluate (z14)(z1) Please help. thanks 
Physics
A pitcher throws a 0.140kg baseball, and it approaches the bat at a speed of 50.0 m/s. The bat does Wnc = 65.0 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m above the point of impact. 
Linear Algebra
1. Considering 2 planes with equations: x + 2y  3z = 1 x + 2y  3z = 18 (a) Given (a,b,c) a point on the first plane, find the point where the line perpendicular to both planes passes by (a,b,c) and through the 2nd plane. 
Linear Algebra
1. Considering 2 planes with equations: x + 2y  3z = 1 x + 2y  3z = 18 (a) Given (a,b,c) a point on the first plane, find the point where the line perpendicular to both planes passes by (a,b,c) and through the 2nd plane. 
Physics  repost
A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel to the ground and swings upward on a ... 
Physics  repost
A satellite has a mass of 5381 kg and is in a circular orbit 4.30 105 m above the surface of a planet. The period of the orbit is 2.06 hours. The radius of the planet is 4.09 106 m. What would be the true weight of the satellite if it were at rest on the planet's surface? 
Physics
A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel to the ground and swings upward on a ... 
Physics
A satellite has a mass of 5381 kg and is in a circular orbit 4.30 105 m above the surface of a planet. The period of the orbit is 2.06 hours. The radius of the planet is 4.09 106 m. What would be the true weight of the satellite if it were at rest on the planet's surface? 
physics
A motorcycle has a constant speed of 20.8 m/s as it passes over the top of a hill whose radius of curvature is 159 m. The mass of the motorcycle and driver is 387 kg. Find the magnitude of (a) the centripetal force and (b) the normal force that acts on the cycle. 
physics
On a banked race track, the smallest circular path on which cars can move has a radius of 105 m, while the largest has a radius of 175 m, as the drawing illustrates. The height of the outer wall is 18.7 m. Find (a) the smallest and (b) the largest speed at which cars can move ... 
math
How much simple intrest would 1,000 earn in 275 days at an intrest rate of 4.21 percent? 
physics
1. A man walks 10km east and 20km south the displacement of the man from initial position 2. In figure below R= 30, find x and Y respectively. 
social studies
Ranchos callampas and favelas are all slum areas in 
Statistics
A survey of 815 students is asked whether or not they have cable TV and Internet cable in their rooms at home. Results of the survey showed that 69% of students has cable TV, 58% of students has Internet cable and 37% of students has both cable TV and Internet cable. Suppose, ... 
Statistics
Wendy is a randomly chosen member of a large female population, in which 9% are pregnant. Wendy tests positive in a pregnancy test. Pregnancy test correctly identifies pregnancy 95% of the time and correctly identifies non pregnancy 92% of the time. What is the probability ... 
Math
The following three points are produced by some quadratic function of the form : f(x) = Ax^2 + Bx + C where A; B and C are real numbers and A = 0; they are (1/2,0);(0,10); and (4,0). Find a quadratic function that satisfy es these three points. 
health
I got alpha 
Math
Suppose an isosceles triangle has perimeter 10 cm. Find an expression for its area A as a function of the length of its base b (assume that the other two sides are the sides of equal length). What is the domain of A? 
Physics
An airplane travels at 880 how long does it take to travel 1.50km 
Chemistry
Four ice cubes at exactly 0 Celsius having a total mass of 55.0g are combined with 120g of water at 77 Celsius in an insulated container. If no heat is lost to the surroundings, what will be the final temperature of the mixture? 
healthh
i found 6 weeks 
math (immediate help please)
how many different four digit numbers can be obtained by using all four of these digits 5,1,1,5? show work please 
algebra
how many different four digit numbers can be obtained by using all four of these digits 5,1,1,5 show work please 
Math
At a large nursery, a border for a rectangular garden is being built. Designers want the border's length to be 5 ft greater than it's width. A maximum of 180 ft of fencing is available for the border. Write and solve an inequality that describes possible widths of the ... 
nervous system
Blood 
math
Everyday im hustlin ms sue sucks 
math
Oh I got it never mind thanks Ms.Sue! 
math
If you don't want to tell me I understand thanks anyway 2 detentions for me then :'( 
math
I don't k ow how and I have a huge report to do so I need the answer please 
math
What's the quickest way for an ant to go from the ground to the tree trunk? 
Math
The left side can be 3 or 3 since the absolute value of 3 is 3. Therefore this can be split in to 2 equations: x^23x+3=3 Which simplifies to, x^23x=0 and, x^23x+3=3 Which simplifies to, x^23x+6=0 Try to solve these and check the discriminant to find the possible solutions. 
physics
A 2.0kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?