Tuesday
October 25, 2016

# Posts by James

Total # Posts: 2,355

Science, Physics, math, calculus
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. You fire the arrow at 35.0 m/s oriented 30.0° above the horizontal from a height of 1.30 m while standing 47.0 m away on your first try. You may neglect ...
November 24, 2013

Science, Physics, math, calculus
Pool players often pride themselves on their ability to impart a large speed on a pool ball. In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in ...
November 24, 2013

Science, Physics, math, calculus
A toy rocket is fired at v0 = 41.2 m/s at an angle of è = 73.8 degrees with respect to the horizontal on flat level ground. Assuming that air resistance is negligible, what is its maximum height (H) and how far (R) will the rocket have traveled in the horizontal ...
November 24, 2013

current and magnetism
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? I tried the ...
November 24, 2013

into computers
What overriding philosophy of the Windows 8 operating system makes it unique compared to earlier Microsoft operating systems?
November 20, 2013

magnets
A proton with a velocity of 2.0 x 10^7 m/s in the horizontal (+x) direction enters a region of uniform magnetic field that is 1 meter wide and points out of the page with a magnitude of 0.05 Tesla. At what angle below the x-axis, in degrees, does the proton's trajectory ...
November 20, 2013

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?
November 20, 2013

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?
November 20, 2013

Physics
3. A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field...
November 19, 2013

math
Harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on a county road. If his total trip was 330 miles, than what was his speed on the freeway?
November 18, 2013

physics
Two forces act on an object. The first force has a magnitude of 17.0 N and is oriented 68.0° counter-clockwise from the x axis, while the 2nd force has x- and y-components (-19.0 N, 16.5 N). Express the magnitude and direction of the net force.
November 14, 2013

Physics
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 93.3 N, Jill pulls with 73.1 N in the northeast direction, and Jane pulls to the southeast with 181 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
November 14, 2013

Physics
A 14.9-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 67.7-N horizontal force. Find the tension in the rope and the rope\'s angle from the vertical. The acceleration due to gravity is 9.81 m/s2.
November 14, 2013

Physics
To better understand the concept of static equilibrium a laboratory procedure asks the student to make a calculation before performing the experiment. The apparatus consists of a round level table in the center of which is a massless ring held in place with a pin. There are ...
November 14, 2013

physics urgent help !
if a 3e charge is at the origin and a magnesium nucleus is 3 cm from the originin the x-axis direction.what is the magnitude of the net electrostatic force a Boron nucleus would experience at the point half way between magnesium nucleus and 3e charge on the y-axis in N
November 11, 2013

physics
if 3e charge is at the origin and magnesium nucleus is 3 cm from the origin in the x-direction. what is the magnitude of the net force a boron nucleus would experience half way between magnesium nucleus and 3 e charge
November 11, 2013

physics
The magnitude of each force is 283 N, the force on the right is applied at an angle 41 and the mass of the block is 27 kg. The coefficient of friction is 0.283. The acceleration of gravity is 9.8 m/s2 . 27 kg μ = 0.283 283 N 41 degrees 283 N What is the ...
November 10, 2013

physics
A block is at rest on the incline shown in the figure. The coefficients of static and kinetic friction are μs = 0.7 and μk = 0.59, respec- tively. The acceleration of gravity is 9.8 m/s2 What is the frictional force acting on the 29 kg mass? Answer in units of N (...
November 10, 2013

PreCal
go to wolfram alpha and plug it in
November 10, 2013

physics
A block accelerates at 3.3 m/s2 down a plane inclined at an angle 27.0. m μk 3.3 m/s2 27 Find μk between the block and the in- clined plane. The acceleration of gravity is 9.81 m/s2 .
November 10, 2013

physics
Masses 19 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure ( The figure shows the 19 kg block on the table connected by a string through a pulley which is connected to the 5 kg block hanging off the table). The ...
November 10, 2013

physics
Masses 19 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure ( The figure shows the 19 kg block on the table connected by a string through a pulley which is connected to the 5 kg block hanging off the table). The ...
November 10, 2013

physics
A capacitor has a circular plate of radiusr=12cm that are at a distance of .2cm part.this is hooked up to 12 V battery. if this caoacitor is submerged in water what happens to the capacitance?
November 10, 2013

physics
if 3e charge is at the origin and magnesium nucleus is 3cm fom thr origin in the x-axis. what is the magnitude of the net electrostatic force a Boron nucleus would experience at a point half way between magnesium nucleus and 3e.
November 10, 2013

physics
if 3e charge is at the origin and the magnesium nucleus is 3cm from the origin in the +x direction, at what position along the x- axis should an electron be placed so that the electron experiences no net force?
November 9, 2013

math
Mortgage lenders base the mortgage interest rate they offer you on your credit rating. This makes it financially critical to maintain a credit score of 700 or higher. How much more interest would you pay on a \$195,000 home if you put 20% down and financed the remaining with a ...
November 9, 2013

calculus
a spherical balloon filled with gas has a leak that permits the gas to escape at a rate of 1.5 cubic meters per minute. how fast is the surface area of the balloon shrinking when the radius is 4 meters?
November 7, 2013

physics
A body of mass 25kg moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor.calculate the coefficient of sliding friction(g=10m/s^2)
October 26, 2013

economics
Clearly explain the different market structure and how they determine the degree of competition among firms and how they maximise profits in the short run and long run Cite the source within the text and bibliography
October 19, 2013

Gen Chm II
Determine the pressure-based Keq for the reaction: 2SO2(g) + O2(g)<--->2SO3(g) given that 1.00×10−2 moles of SO2 and 2.00×10−2 moles of O2 were initially placed in a 2.00 L reaction chamber. The chamber contained 7.5×10−3 moles of SO3 ...
October 7, 2013

Chem
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6635 J. What is the specific heat of the gas?
October 6, 2013

Chem
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6635 J. What is the specific heat of the gas?
October 6, 2013

Chemistry
Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed in a 0.870 L ...
October 4, 2013

Brief Calc
Very nice, thanks Reiny
September 25, 2013

Brief Calc
i submitted the answer steve had first and it came out correct for the previous question
September 25, 2013

Brief Calc
thank you that one was correct, i just had one other i couldn't get, the problem is find dy/dx using implicit differentiation: 4x+3y=xy i found the derivative to be... y-4/3-x same question as the last one, y=? dy/dx=? Thanks again for your help
September 25, 2013

Brief Calc
e^x y =3 find dy/dx using implicit differentiation the answer is -y Compare your answer with the result obtained by first solving for y as a function of x and then taking the derivative. y=? dy/dx=? help me out with these last two please I don't know what they are asking
September 25, 2013

Chemistry
A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities do not react, what...
September 22, 2013

Science/ Chemistry
When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for the reaction of ...
September 22, 2013

Chemistry
What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O
September 21, 2013

Calculus
Find the Indefinite Integral without u substitution of the following a)(8x-3)/(12x^6) b) 2sqrtx(5x-6) c) (4x+3)/xsqrtx d) (5x-6)^2 / sqrt x e) 16x^2 + x - 20 / 4x^2
September 18, 2013

further Mathematics
Let A=(cosA -sinA) (sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
September 17, 2013

further mathematics
Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))
September 17, 2013

Physics
at the same time
September 16, 2013

math
In a regular hexagon, what is the ratio of the length of the shortest diagonal to the length of the longest diagonal? Express your answer as a common fraction in the simplest radical form.
September 8, 2013

physics
A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
September 4, 2013

physics
A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
September 4, 2013

physics
how far has it gone @bobpursley
September 4, 2013

MATH
THE QUOTIENT IS 45 1/4 WHAT IS THE DIVISOR
September 3, 2013

Algebra
(3Q+2T+F)/5=0.90 for F
August 27, 2013

math
Solve 3^x * 9^2x * 8^x/18^x *27^2x *3^2x
August 24, 2013

us history
The Constitution has endured for more than 200 years. Use what you have learned about the principles of the Constitution to explain why it has lasted as a framework for the nation's government
August 23, 2013

us history
What is taxation without representation? Why did the colonists consider this practice a problem?
August 23, 2013

physics
Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m
August 21, 2013

physics
Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m
August 21, 2013

physics
A bullet is fired in a horizontal direction with a muzzle velocity of 300m/s.in the absence of air resistance,how far will it have droppped in travelling a horizontal distance of 20m.
August 20, 2013

writing
Explain what is wrong with the following sentence and revise as needed to correct the problems: " While repelling from the cliff, my backpack slipped and fell to the canyon floor."
August 7, 2013

Math Statistics
5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 36 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this ...
July 29, 2013

geometry
consider a circle of radius 1, and corresponding inscribed and circumscribed polygons with the number of sides n = 3, 4, 5, 6, and 8. A: For each n = 3, 4, 5, 6 & 8, what are the areas of the inscribed and circumscribed polygons with n sides?
July 27, 2013

Math Statistics
2. A statistics professor has asked his students to flip coins over the years. He has kept track of how many flips land heads and how many land tails. Combining the results of his students over many years, he has formed a 95% confidence interval for the long-run population ...
July 27, 2013

Math Statistics
Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the student has a visual or verbal learning style. Of the 39 students who took the survey, 25 were judged to have a visual learning style and 14 were ...
July 25, 2013

finance (math)
nevermind... it's the same as 5%. I get it.
July 22, 2013

finance (math)
If you just use the Table of Future Value Factors, you'll see that 5% at 15 years is 2.079. Therefore, 75,000 * 2.079 = 155,925. I am really confused as to where the 1.05 comes from...
July 22, 2013

finance (math)
Where are you getting the 1.05 from?
July 22, 2013

American National Government
The purpose of gerrymandering a district is to- the influence of certain groups and gurantee that certain representatives keep their seats
July 21, 2013

Math: Calc 2
Find the volume of the solid obtained by rotating the region under the graph of the function f(x) = x^(13/12) about the x-axis over the interval [1,3]. Thanks!
July 9, 2013

physics
A 75.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.30 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?
July 8, 2013

physics
A speed boat is required to move at a constant speed of 50 MPH. What is the power needed to overcome a resistive force of 1000 lbs from the water?
July 3, 2013

English
June 25, 2013

Discreet math
[(pvq)^(p=>)^(q=>)]=>r[(pvq)^(p=>)^(q=>)]=>r
June 25, 2013

Math 61 part 2
Find the centriod of the boundEd by the curvez y=x^2 and y=2x+3
June 24, 2013

Math 61
Find the arc length of the curve y^3=8x^2 fr0m x=1 to x=8.
June 23, 2013

statistics
The customer bills in a family restaurant are normally distributed. The bills mean is \$28 and has a standard deviation of \$6. a. Identify what the random variable you are measuring is in this problem. b. What is the probability that a randomly selected bill will be at least \$...
June 22, 2013

World Geography
reconciling diverse cultural heritages
June 19, 2013

Geometry
53. What is the equation of the circle with center (2, –5) that passes through the point (–2, 10)? (1 point) (x – 2)2 + (y – (–5))2 = 25 (x – (–2))2 + (y – 10)2 = 241 (x – 2)2 + (y – (–5))2 = 241 (x – (–2))2 + (y...
June 10, 2013

Geometry
50. Find the value of x for ° and °. The figure is not drawn to scale. (1 point) 34° 56.5° 22° 68°
June 10, 2013

Geometry
46. Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x. Figures are not drawn to scale. mO = 128° (1 point) 52 308 64 256
June 10, 2013

trigonometry
how do i determine the point of intersection of a circle with a radius of 14 and the line coming in at a 35 degree angle
June 6, 2013

physics
A juggler traveling in a train on level track throws a ball straight up, relative to the train, with a speed of 5.75 m/s. The train has a velocity of 19 m/s due east. (a) As observed by the juggler, what is the ball's total time of flight? s What is the displacement of the...
May 30, 2013

Physics
How much work does it take to stretch a spring with k= 150N/M 10cm from equilibrium?
May 30, 2013

Physics
If the coefficient of kinetic friction is 0.25, how much work do you do when you slide a 45 kg box at constant speed across a 5.8m -wide room?
May 30, 2013

Physics
Segment A 540-0/120-0 =4.5 Segment B 0-0/0-0 = 0 Segment C 1080-540/288 = 7.5
May 29, 2013

Physics
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 60 s per increment, and the scale for the velocity axis is 270 m/s per ...
May 29, 2013

CHEMISTRY
Which of these statements is not true? lithium reacts with carbon to form ionic carbides, Acetylene is neccesary for the formation of some carbide liquid ammonia is is used to form carbides All metals react with carbon to form carbides
May 29, 2013

Chem
The molar weight of MgSO4 is 120.366gmol-1. What is the mass/volume percentage of a 2.5M water solution of MgSO4?
May 27, 2013

Physics
Starting from rest, a skier slides 100 m down a 28 degree slope.How much longer does the run take if the coefficient of kinetic friction is 0.17 instead of 0?
May 27, 2013

Statistics
During the 2011-12 winter season, a homeowner received four deliveries of heating oil, as shown in the following table: Gallons Purchased Price per Gallon (\$) 209 2.60 182 2.40 157 2.78 149 2.74 The homeowner claimed that the mean price he paid for oil during the season was (2...
May 26, 2013

Statistics
. The following data give the 2010 gross domestic product (in billions of dollars) for al 50 states. The data entered in alphabetical order by state (Source: Bureau of Economic Analysis). 173 49 254 103 1901 258 237 62 748 403 67 55 652 276 143 127 163 219 52 295 379 384 270 ...
May 26, 2013

Statistics
1. The following data give the amount of money (in dollars) that each of six Canadian social service charities spent to raise \$100 in donations during 2010. The values, listed in that order, are for the Calgary Inter-Faith Food Bank Society, Covenant House Toronto, The ...
May 26, 2013

Ethics
how do businesses try to find their way around these laws
May 24, 2013

math
If it is given tan(A-B) tanA-tanB/-1+tanAtanB and tanP-1/1+tanP=tan195 Find the value of P
May 19, 2013

Math
A wheel on Greg's bicycle is 0.3 m in diameter. Greg races the bicycle for 31 m. How many times does the wheel turn as the bicycle travels this distance?
May 14, 2013

Public speaking
When conducting research for supporting materials, it is imperative to remember: A. there is one right source for certain information. B. always to take notes and record. C. always do a personal interview. D. use only the most current source of information
May 13, 2013

Environmental Science
Consider the population situation in Italy or Germany; very low birth rates, an aging population, and eventual decline in overall numbers. For this week's individual work, please write a 1-2 page paper (counting body text only, not title or reference pages) in double-...
May 9, 2013

calculus
Given ensuing information, determine the least cost and the least cost mix of on- and off-shore pipe. The intake facility is in the water 2 miles vertically north of the shoreline The water filtration plant is on land 1 mile vertically south of the shoreline The intake and ...
May 8, 2013

Math
316/1 = x/3 cross multiply 316*3 = x 948 = x x = 948 similar cone volume
May 8, 2013

Ms.Sue
Ms.Sue, do you know how to do calc?
May 8, 2013