# Posts by jason

Total # Posts: 1,347

physics
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?

physics
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?

An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s.

In a particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.7 × 10 -27 kg. What is the force on the proton

physics
A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current ﬂows through a square area of membrane on a side? (ii...

I have this same question, hope you get the answer

chemistry
Suppose you add a small ice cube to room temperature water in a coffee cup calorimeter. What is the final temperature when all the ice is melted? Assume that you have 200.0 mL of water at 25.0 degrees Celsius and the ice cube weighs 15.0 g and is at 0.0 degrees Celsius before ...

Chemistry
284.47

Algebra
4 years ago my father's age was 4 times that of my age. At present the sum of my father's age and that of mine is 53 years . What is father's present age.

Physics
A washing machine drum has a diameter of 46 cm and spins at 400 revolutions per minute. Find the centripetal acceleration at the drum's surface. Give your answer in m/s

Physics
The mass of the Earth=Mg=5.97x10^24 kg. The radius of the Earth=RE= 6.38 x10^6 m. A) What is the weight of the 75 kg person? B) Determine the acceleration due to gravity aboard a space shuttle at an altitude of 400km.

Stats
Checking the weather. 60% chance of rain at the bears football game. In the past, when it rains, bears win ,44% of the time and when it doesn't rain they lose 27% of the time. What's the probability that at the next game, the bears win in the rain?? Thanks

Math algebra
A tailgator

physic
Predict the horizontal distance a cannon on a 15 m cliff will shoot if it's initial velocity is 140 m/s and it's inclined at 15 degrees.

Science (college level)
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...

It's 37 no Durham of course

Chemistry
Ok, thank you! this makes a lot of sense. and the pKa is the -logKa? Ka=[NH4^+]=110?

Chemistry
pH=pKa+ log(conjugate base/conjugate acid) I have it in my notes, I just can't figure out the steps to solve this problem, or how it applies.

Chemistry
A solution made up of 1.00 M NH3 and 0.500 M (NH4)2SO4 has a pH of 9.26. a. Write the net ionic equation that represents the reaction of this solution with a strong acid. b. Write the net ionic equation that represents the reaction of this solution with a strong base. c. To ...

Math
there are 9 blue marbles, 4 black marbles, 5 white marbles and 6 red marbles. If the probability of drawing a blue marble is now 1/3, how many of the 6 marbles removed were blue?

phi
How would the Kantian moral theory apply in resolving the negative effects on a community? (Points : 1) By treating persons in the community as ends in themselves, then companies will strive to provide quality products as well as to remedy any negative effects imposed on the ...

phi
Which of the following does Peter Singer assert about the principle of equality? (Points : 1) People should have equal rights because they are factually equal. People with higher abilities, it stands to reason, should have greater rights. Different groups of humans should ...

Math
A bus tour company charges a flat fee for renting out the bus, and an additional amount for each person. If the price is quoted at \$382 for 12 people and \$430 for 16 people, what is the flat fee?

English
To convert sunlight and energy into food is the end result of photosynthesis

math
A formula has to be written that takes all the money into account and the time that the carpenter's will spend on the deck. We know that the store charges \$1000 for materials and \$30/hr on labor. So with that information we can say this: \$1000 + (\$30 * t) = total Where t ...

Physics
I think the answer might be 1361 N. The larger force will pull the rope in the direction of that force causing the tension to be 1361 N.

Physics
a) F = ma this is Newton's second law. For each team you are given F and m All you have to do is solve for a: a = F/m That should be easy to do. b) The tension is easy too, both teams are pulling on the horizontal so it's merely 1361 N - 1350 N = 11 N.

financial
The formula for compound interest (which this problem asks about) is: A = P(1+(r/n))^(nt) Where A is the amount you end with, P is the original/beginning amount, r is the interest rate, n is the number of times interest is compounded, and t is the number of years. So because n...

Ethics
The government doesn't have any imperative to enforce social and moral expectations on business, but it does anyways. Through various government agencies they direct the operations of businesses which is enforcement. This enforcement comes from regulations that were ...

Math
1.5km with a run of 16km what's the elevation

Statistics
Suppose the mean income of 35-year-olds in the US is \$25,000. A random sample of 150 35-year-olds in California results in a sample mean income of \$26,600 and a sample standard deviation of \$3800. At the 5% significance level, ca we conclude that the true mean income of 35-...

chemistry
which of these reactions if spontaneous? (a) Fe^0 + Mg +2 --> Mg^0 +Fe+2 (b) Fe+2 + Mg ^0 --> Fe^0 + Mg +2 write the half cell equations for the spontaneous reaction. which element is oxidized and which is reduced?

science
Thanks jack got a 100%

Physics 270-1 Applied
A rock is thrown down with an initial speed of 30.0ft/s from a bridge to the water below. It takes 3.50s for the rock to hit the water. (a) Find the speed (in ft. /s) of the rock as it hits the water. (b) How high is the bridge above the water?

Game Development
In relation to game AI what is a flocking behaviour? Give an example of flocking behaviour in a game.

Trig
Use the given information to evaluate sin (a+b). Exact answers only. No decimals. Tan a = 4/3, cos b ='-12/13; neither a nor b are in quadrant III.

Physics
A girl throws a ball at a fence 10m away. The ball is 2m from the ground when it leaves her hand with an initial velocity of v=8 i+8 j m/s. When the ball hits the fence its horizontal velocity component is reversed (the vertical velocity component is unchanged). Where does the...

Statistics
In a study of 200 students, 42 were found to have a GPA greater than 3.0. Find a 98% confidence interval estimate of the proportion, p, of all students that have a GPA greater than 3.0.

Physics
is there any way i can get ur email so i can send the pic of the question

Physics
A block of mass M1positioned on a slope (at an angle  ) is connected by means of an inextensible wire, of negligible mass, to another mass, m2, suspended from a frictionless pulley. The coefficients of static and dynamic friction between the slope and M1are 0.3 and 0.2...

math
marissa pours 1 1/2 cups of punch in each glass how many fluid ounces is each serving?

chemistry
.93 volts, .41 volts, and 1.99 volts. I tried to find them out with "doctor" bobs way but I couldn't do them. My teacher did not even bother to teach us how to do this. For future reference Dr. Bob, instead of asking for one's work, how about at least show ...

Physics
45.3?

Physics
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...

Physics
An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no ...

Physics
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...

econ
68

Multiple-Concept Example 10 provides one model for solving this type of problem. Two wheels have the same mass and radius of 5.0 kg and 0.47 m, respectively. One has (a) the shape of a hoop and the other (b) the shape of a solid disk. The wheels start from rest and have a ...

The wheels, axle, and handles of a wheelbarrow weigh W = 56.2 N. The load chamber and its contents weigh WL = 584 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man's hands apply a force to the ...

Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 26.1° above the horizontal. One child, with a mass of 43.6 kg, is hanging 1.31 m along the branch from the tree trunk. The other child, with...

Physics
A particular garden hose has an inside diameter of 15/16 in. The nozzle opening has a diameter of 5/16 in. When the flow speed of the water in the hose is 0.58 m/s, what is the flow speed through the nozzle?

Physics
A spherical hydrogen-filled balloon is used to lift a load of 5950 N (in addition to the weight of the hydrogen). Suppose the density of the air is 1.18 kg/m3. Find the minimum necessary radius for the balloon

Phyiscs
A hollow copper tube (diameter = 4.01 cm) is sealed at one end and loaded with lead shot to give a total mass of 0.218 kg. When the tube is floated in pure water, what is the depth, z, of its bottom end?

Physics
A 4.8 kg container of water sits on a scale A. A cube of aluminum with sides of length 11.0 cm is suspended from a spring scale B so that half of the block is submerged in the water. What is the reading (in N) on spring scale B The continual question is What is the reading (...

educational technology
Is it B?

chemistry
calculate the grams of solute neede to prepare 24 grams of a 13.5% by mass scurose (c12h22o11) solution

math
Let y=3(x-4)^2 -3 a) Show that y=3x^2 -24x +45 b) For the graph of y find both x intercepts by solving the equation 3x^2 -24x +45 =0 A) direction of opening B) x intercepts C) y intercept D) Axis of Symmetry E) Vertex F) max or min

Math
A person travels 8 mi, due north, 3 mi, due west and 7 mi due south how far are they from were they started?

chem
Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI(g) mc026-1.jpg H2(g) + I2(g) K for the reaction is 0.016. If 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established?

math
a piece of wire 24 ft. long is cut into two pieces. one piece is made into a circle and the other piece is made into a square. Let the piece of length x be formed into a circle. allow x to equal 0 or 24, so all the wire is used for the square or for the circle. How long should...

Physic
The figure below shows a block of mass m resting on a 20¡ã slope. The block has coefficients of friction ¦Ìs = 0.73 and ¦Ìk = 0.53 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging...

Math
2 9asldjhsauidhsishdna

Math
5 plus 5 equal dick

Literature
thanks

Literature
yes

Literature
Can someone help me with, the book "Invisible Man" and which character wore the mask.

science

science

Statistics
Suppose x has a distribution with μ = 11 and σ = 5. (a) If a random sample of size n = 45 is drawn, find μx, σ x and P(11 ≤ x ≤ 13). (Round σx to two decimal places and the probability to four decimal places.)

General Chem
66.86g

Chemistry 2
A solution of NaOH (aq) contains 8.2 grams of NaOH(s) per 100.0 mL of solution. Calcualte Ph and POH at 25 degrees celsiuis

Chemistry 2
Calcualte PH and POh of an aqueous solution that is 0.050 M in HCL and 0.085 M in HBr at 25 degrees C

english literature
can you help me comment on this theme please. awe and amazement

Pre Algebra
I have to create two dice (each on has six sides) they have to be numbered in such a way that the probability of rolling the numbers 1-12 are the same? I know this is a function but I am having trouble.

An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?

physics (this one is killing me clear answer)
At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = –0.360 m/s2 and ay = –0.980 m/s2. What is the velocity of ...

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.0 m/s at an angle of 38.5° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...

geometry
A cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an approximation of π.)

science help plzzz
Just to clear things out Ms, Sue and Hailie are both correct, and the answers will not change for unit reviews so your fine..

Algebra
Thank you Ms. Sue, that helps a lot!

Algebra
A road map has a scale of 5/8 for every 125 miles. How many inches would be needed to represent 1000 miles on the map?

Physics 221
An electron is accelerated by a uniform electric field (1000 V/m) pointing vertically upward. Use energy methods to get the magnitude and direction of its velocity after it moves 0.10 cm form rest. Does the electron gain or lose potential energy?

chemistry
PV = nRT P = pressue V = volume n = moles R = 8.31 T = Temperature (0c = 273K) (103.0)(26.4) = n(8.31)(283) 2719.2 = n(2351.73) 2719.2 / 2351.73 = n m = 1.16

the wrong word is on. it is supposed to be in. you`re welcome.

electromagnets
A current loop with radius 20 cm and current 2 A is in a uniform magnetic field of 0.5 T. Considering all possible orientations of the loop relative to the field, what is the largest potential energy difference (in Joules) you can find between two orientations?

electricity and magnetism
A current of 20 mA flows in a single circular loop with a radius of 2 meters. A uniform magnetic field of 1.2 T points parallel to the plane of the loop. What is the magnitude of the magnetic moment of the loop in A-m^2? What is the magnitude of the torque on the loop in N-m?

literature
I have one more confusing question regarding this. And Thank you Ms.Sue for answering the last question! Franklin's humor in Witch Trial at Mt. Holly depends upon the belief that... a)the belief that religion takes precedence over science b)the belief that the physical ...

literature (bejamin Franklin)
I have one more confusing question regarding this. And Thank you Ms.Sue for answering the last question! Franklin's humor in Witch Trial at Mt. Holly depends upon the belief that... a)the belief that religion takes precedence over science b)the belief that the physical ...

literature (bejamin Franklin)
As a poor boy, Franklin realized that he could not buy many books, but he came up with an idea that could give people access to as many books as they wanted. This idea was essentially.. a) get a government grant b)get the government to buy the books c)have all your friends ...

Math
An irrigation pump can pump 250 liters of water per minute. How many hours should the system work to water a rectangular ﬁeld 75 m by 135 m to a depth of 3 cm?

Math
you were wrong on most of them

pre cal
ah i forgot to clarify the 1/2L is being multiplied by the squareroot of T/u

pre cal
How do I express this relationship in a language of variation? I know how to do basic ones but this one is really advanced looking. f=1/2L squarert T/u

History (black death)
Which best describes the right answer to: The Black Death first came to Europe- a) through sailors in Italian ports. or b) through merchants trading in France. I know that it was spread through ship. But the wordings that she put is so confusing....

History
Is dark ages same as early middle ages???

History
Which do you think best describes the word Feudalism?? a system designed to increase the power of lords rather than vassals or a reciprocal personal economic and political relationship between lords, vassals and peasants

Math
Find the points of intersection of the parabolas y=1/2x^2 and y=1-1/2x^2. Show that at each of these points the tangent lines to the two parabolas are similar Answer (+-1,1/2) Please show and explain all steps thank yo

literature
In "How the World Began" what we now consider the North American continent, Native Americans saw as Answer a-turtle's back b-a pancake c-a great American desert d-the Land of Oz In "How the World Began," Iagetci's fall from the upper world is ...

Chem
I have done this so many way and can't seen to get the right answer please help! I'm looking for the Concentration of NiCl2, M from the following Volume of 0.390 M NiCl2, mL 4.0 3.0 2.0 1.0 Volume of water, mL, 0 1.0 2.0 3.0 Absorbance 0.858 0.644 0.429 0.215 I keep ...

Science - Physics, I need help with both please.
A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. What was the average force of air resistance (e.g., friction) acting on the diver? Bonus: What is the force of friction underwater if she reaches a depth of 2.5 m ...

Post a New Question