# Posts by James

Total # Posts: 2,544

Physics
A block of mass 13.9 kg slides from rest down a frictionless 40.0° incline and is stopped by a strong spring with a spring constant 32.3 kN/m (note the unit). The block slides 7.80 m from the point of release to the point where it comes to rest against the spring. When the...

Physics
A M2= 6.40 kg mass is released from rest at height h = 6.60 m . Using the law of conservation of energy, determine the speed of the M1= 2.70 kg mass just as the M2= 6.40 kg mass hits the ground.

college algebra
How much should be deposited in an account paying 3.5% interest, compounded quarterly, in order to have a balance of \$ 6,000after 17years and 3months?

math
A cube with length 4cm is divided into 8 identical cubes.How much greater is the combined surface area of the 8 smaller cubes than the surface area of the original cube?

L.A
you would you think someone would do your work? you did not even put any effort into this question. You barely even put effort into typing the question! Stop being lazy!

math
A rectangle measuring 7cm by 4cm is enlarged by a ratio of 2:1.what is the area of the enlarged rectangle.

Physics
Can someone help me solve this one? I've tried it a few times, but I don't think I'm getting it right. A block of mass M = 2.2 kg starts from rest at a height of 3.6 m on a fixed inclined plane. The coefficient of kinetic friction between the block and the incline ...

Physics
Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the system ...

Physics
Can someone walk me through how to work this? A block is being pushed up a frictionless incline by an applied horizontal force, F=12.7N. (The angle is θ = 23.80° and the mass is 1.70kg. a) How many forces are acting on the block? b) How many of those forces are along ...

Physics
Can someone help me with this problem? It requires a lot of visualizing and I've never been great at problems like that. A pair of blocks of mass m1 =29.0 kg, and m2 =58.0 kg, are being pushed on a horizontal surface by a constant forces of magnitude F=87.0 N. The angle &#...

Physics
I think I've found everything but e. Here is my work a) acceleration = v-u/t a = 1.95/1.22 a = 1.6 b) 2, gravity and the normal force c) F = m(g – a) F= 42(10-1.6) F = 352.8 d) acceleration = v-u/t a= 1.95/7.8 a= .25 F= m(g-a) F= 42(10-.25) F= 409.5 Does anyone else ...

Physics
A 42 kg man stands on a bathroom scale in an elevator. Starting from rest at the bottom floor, the elevator ascends, attaining its maximum speed of 1.95 m/s in 1.22 s. It travels with this constant speed for the next 7.80 s. The elevator then slows down for 2.20 s and comes ...

Physics
Hey, I'm studying for my physics class, and I'm not sure how to solve this problem. Can someone walk me through it please? I'd really appreciate any help! John throws a baseball from the edge of a cliff with an initial velocity of 17.0 m/s at an angle 27.0° ...

math
If Owen gives \$40 to Charley, the will have an equal amount of money. If Charley gives \$80 to Owen, the ratio of Owen's money to Charley's money will be 4-1.How much money does Owen have in the beginning? Work: I don't have much but X=Owen C=charley X=C-40 4C=O+80

Chemistry
An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% Carbon and 5.30% H. The molar mass is determined by measuring the freezing-point depression of an aqueous solution. A freezing point of -5.20 ...

Math
What is the domain of x/(x-1)? Is it all x <> 1?

Physics
This one has been confusing me, can someone walk me through it? I'd like to know which formulas I need to use and everything. A 121.0 -kg crate is sitting at rest on a ramp leading to the back of a truck. a) How many forces are acting on the crate while it is at rest? b) ...

Physics
Hey! I've tried using equations such as weight=m*g for this problem, but I don't think I'm doing it right. Can someone help? A helicopter was seen carrying a heavy bag of sand (1210.0 kg). A student figured that the acceleration of the sand bag then was 1.4 m/s2 in...

math
25

Biology
explain the consequence of x chromosome inactivation in terms of the proteins encoded by the x chromosome genes?

Algebra 2
Describe an infinite geometric series with a beginning value of 2 that converges to 10. What are the first 4 terms of the series?

Science
Wow, you dumb people. You're all wrong. The answers are... 1. A 2. C 3. B 4. False I followed Aaron and got a 0%. Aaron, you're a dick.

Dynamics
The 25-lbf block has an initial speed for v0 = 10 ft/s when it is midway between springs A and B. The coefficient of static and kinetic friction between the plane and the block are μs = 0.45 and μk = 0.4, respectively. After striking spring B, the block rebounds and ...

Microcomputer applications
thank you

Microcomputer applications
Do you know if there is an online tutorial for the book Office 2013 Marquee by Rutosky, Sequin, Roggenkamp, Rutosky

English(ASAP)
The answer is b I just did it

chem
nevermind i got it, accidentally put in 5.86 instead of 5.96 :)

chem
Calculate the energy of a photon of green light with a frequency of 5.96 ✕ 10^14 s−1 I keep getting 3.88e-21, but the quiz keeps saying I'm wrong...

accounts
On January 1, 2012, the organizers of the Parsons Corporation obtained their charter and issued 10,000 shares of \$1 par common stock for \$4 per share. During 2012, the corporation earned \$30,000 in cash revenue and paid \$20,000 in cash expenses, not including income tax. The ...

Probability
Alfred and Bob toss a coin alternatively, and whoever gets a head first will win. They play many times and whoever loses in the previous play will toss first at the next play. If Eric tosses first at the first play, then what is the probability that Eric will win at the 6th play?

investing
How many years, correct to 1 decimal place, will it take for K54,321 invested at a compound interest of 13% per annum, to amount to K98,765

physics
A jet plane lands in an airport with a speed of 125 m/s and can accelerate uniformly at a maximum rate of -9.8 m/s2 as it comes to rest. What should be the minimum length of the runway so that the jet plane can land in the airport safely?

Science
I HAVE SAME QUESTION

Science
ITS EATHER coarse grains OR fine grains

Science
WELL WE KNOW IT COOLED SLOWLY AND...

Physics
A 7.1 kg watermelon is placed at one end of a 5.9 m, 244 N scaﬀolding supported by two cables. One supporting cable is at the opposite end of the scaﬀolding, and the other is 0.54 m from the watermelon. How much tension is in the cable at the end of the sca&#...

biology
physiology

chem
1. A 4.61 g sample of one of the substances listed in the table below was heated from 21.3°C to 315.7°C, requiring 190 J to do so. What substance was heated? I got mercury(l) 2. Calculate the energy required in joules and calories to heat 33.9 g of aluminum from 30.7&...

Math
40

Maths and Physics
Your clue is impossible, water release at a velocity of 20m/s cannot lift a 10 kg garbage can under earth's gravity. F=lambda 2v^2 (assuming elastic collision) = 2mv^2/d = 2(dm/dt)(v^2)/u = 20N which can lift a can of 20/9.81 kg so your water can only lift a max of 2.04 kg...

math
485

Chemistry re-post
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry (Electrochemistry)
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry (Re-post)
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. So you expect that ...

Chemistry
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. I understand that D ...

Chemistry
Imagine that you have a 7.00L gas tank and a 4.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145atm , to what pressure should you fill the...

Chemistry (Electrochemistry)
The thickness of a pure Ag plate on a base metal is to be determined by controlled potential coulometry. The metal sheet is masked except for a circular area, 0.5cm in diameter. Electrical connection is made to the metal and the sheet is clamped in a cell so that the unmasked ...

geometry
From an apartment window 24 m above the ground, the angle of depression of the base of a nearby building is 38 degrees and the angle of elevation is of the top is 63 degrees. How tall is the nearby building?

Math
6 9/8-25/6=

AP Calc
For the curve f(x)=x ln x+(1-x)ln(1-x), find the value of x in the interval 0<x<1 where f(x) has a minimum.

algebra
Traveling downstream a certain boat went 21 mph. Traveling upstream it went only 5 mph. Find the speed of the boat in still water and the speed of the current.

Chemistry
If 25.00 ml of H2SO4 solution is titrated to an end point with 32.16 ml of 0.1986 M NaOH, what is the molarity(M) of the H2SO4 acid?

Chemistry
Which of the following factors affect the solubitity? a)temperature of the solutions b)polarity of the solvent vs solute molecules c)partial pressure of the gas above the solution d) all of the above

Math
A boy is dividing M&Ms between himself and his sister. He gives 2 to his sister and takes 2 for himself. He gives 2 to his sister and takes 4 for himself. He gives 2 to his sister and takes 6 for himself, and so on. (b) After n rounds, how many M&Ms does his sister have and ...

Biology
The Deflex binds with the receptors in the synapses which means the transmitter can no longer bind to the receptors, this means that the nerve impulse cannot be sent along the relay neurone. Deflex also binds to the neurotransmitter once released and breaks it down.

Physics
A ball of mass m is attached to a spring with a spring constant k. The system is attached to a thin vertical axis as shown in Figure 4. In its equilibrium vertical position the spring length is L. The axis starts to rotate with a constant angular frequency ω. Find the ...

AMA
A force of 1.24 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?

Math
Limit(7x+6x^2) / (7x^2+6x) x->inf

Sociology
Alright. Thanks Writeacher.

Sociology
Are Ethnic Groups the same as Societies?

history
the huguenots were

physics
bubba

Thank You reiny do you think you can explan this one The total income from three investments was \$2400. After 14 years, Investment I income has doubled, Investment II income has increased by 50% and Investment III went broke. If the income increase in Investment I equals the ...

A man has \$210,000 invested in three properties. One earns 12%, one 10% and one 8%. His annual income from the properties is \$20,100 and the amount invested at 8% is twice that invested at 12%. How much is invested in each property? at 12% 10% and 8% What is the annual income ...

A man has \$210,000 invested in three properties. One earns 12%, one 10% and one 8%. His annual income from the properties is \$20,100 and the amount invested at 8% is twice that invested at 12%. How much is invested in each property? at 12% 10% and 8% What is the annual income ...

Calculus
The slope of the line tangent to the curve xy+(y+1)^2=6 at the point (2, 1) is

math
The 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one twenty fourth the 5th term.find the 4th term.(there is a mistake in the 2nd to the last statement.help locate the mistake{final answer 4th term =48).i solved to this extent.ar^2=9 r=3.

math
the 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one-twenty fourth the 5th term.find the 4th term.(my solution so far).ar^2=9a r=sqr of 9 r=3.help me find the 1st term

math
The 3rd term of a geometric progression is nine times the first term.if the second term is one-twenty fourth the 5th term.find the 4th term. solution ar^2=9a r=sqr of 9 r=3.pls help me on how to get the first term(a)

math
The third term of a geometric progressiom is nine times the first term.if the second term is one-twenty fourth the fifth term.find the fourth term.ar^2=9a. r=sqr of 9 r=3.pls teach me how to get the first term and i can get the 4th term myself

Chemistry
Provide the name(s) for the branched constitutional isomer(s) with the molecular formula C7H16 that have three methyl groups.

Chemistry
Provide the name(s) for the branched constitutional isomer(s) with the molecular formula C7H16 that have three methyl groups.

Math
A stone was dropped off a cliff and hit the ground with a speed of 112 ft/s. What is the height of the cliff? (Use 32 ft/s2 for the acceleration due to gravity.)

Math
A particle is moving with the given data. Find the position of the particle. v(t) = 1.5sqrt(t), s(9) = 33

geography
How has Mexico's culture been shaped by conflict among different people?

chemistry
3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a ...

science
A 2000kg car traveling at a speed of 27m/s skids to a halt on wet concrete where μk = 0.20.

Science, Chemistry
Write reactions showing how each of the following buffers would neutralize added HCl. HF and NaF Express your answer as a balanced chemical equation. Identify all of the phases in your answer. HC2H3O2 and KC2H3O2 Express your answer as a balanced chemical equation. Identify ...

Science, Chemistry
Write neutralization reactions for each of the following acids and bases. HNO3(aq) and Ba(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

accounting
a 10 year coupon bond that yield 5% is issued with a 1000 par value. what is the issuance price of the bond

Math
Question: Write a word problem using 7 groups. And then solve the problem Can you give an example?

Physics
1800n

Physics
A cannon is fired from the ground at an angle of 30 degrees. It is being shot an an initial velocity of 200m/s. What is the maximum height of the cannon ball? How fat will the cannon ball travel before it hits the ground

science, chemistry

Computing- Python (simple-ish stuff)
Great thanks so much!

Computing- Python (simple-ish stuff)
Hi, I'm working on this piece of code: numLaptops = 7 laptopCost = 599.50 price = numLaptops * laptopCost print("Total cost of laptops: \$%.2f" % price) But the question wants me to explain the output if I put 2.5 instead of .2, 8.2 instead of it and 3.1 instead ...

chem
Calculate the total pressure in the flask after all of the oxygen has been removed from the air in the flask. Assume that the temperature is 25¡ÆC, the initial barometric pressure is 760 torr and that air is 21% oxygen by volume.

chemistry
A chemist wants to make 5.50 L of a 0.300 M lithium phosphate solution. What mass of lithium phosphate must be used to make this solution?

statistics
Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks? b. What percent of taxpayers will get their refund within 10-15 weeks? ...

research methods grant writing
The table labeled “Brooklyn Precinct Activity Measures” shows counts of different indicators from the June 1999 Compstat report. All data are totals for the period January 1, 1999, through June 20, 1999. Notice, in the key to this table, that some indicators are ...

calculus
A lamp post 3m high is 6m from a wall. A 2m man tall is walking directly from the post toward at 2.5m/s. How fast is his 1.5 from the wall

mathematics
what is algerdra

chemistry
a sample of freon-12 occupies 25.5 litters at 28 celsius find its volume at 15 degree celcius when the pressure is kept constant

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. If the balloon misses or shoots over the building, how far will the balloon land from its launch location?

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?