Posts by edwin
Total # Posts: 128

physics
A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is 11.0 meters/second. What is the velocity ... 
Science
Two trains are traveling towards each other, starting 100 kilometers apart. One train travels at 40 kilometers per hour while the other travels at 60 kilometers per hour. The plane starts flying at 90 kilometers per hour, starting from the location of the faster train. Once ... 
math
Mrs. Morton has a special reward system for her class. When all her students behave well, she rewards them by putting 333 marbles into a marble jar. When the jar has 100100100 marbles or more, the class has a party. Right now, the jar contains 242424 marbles. Let rrr represent... 
PHYSICS
AN ELECTRIC FIELD 1500N AND MAGNETIC FIELD 0.40T ACT AT A,MOVING PROTRON TO PRODUCE NO FORCE.CALCULATE THE MINIMUM SPEED OF THE PROTRON. 
Bio
without oxygen cellular respiration grinds to a standstill although glycolysis can continue to make some atp anaerobically for a short time explain why the oxidative phosphorylation stops why does the citric acid cycle stop 
Math
Use the normal distribution of weights of adult men, which has a mean of 170 pounds and a standard deviation of 7.5 pounds. Use the zscore chart to find the percentage of heights less than 155 pounds. 
Maths
From 1 to 9, which number should be put in the middle of a magic square( 3 by 3 magic square), so that no matter how you add three numbers in a straight line .... up, down, sideways or diagonally .... you will get the same answer. 
investment accounting
You have been hired as a financial consultant to defense electronics,Inc. 
Math
A tree and a flag pole are on the same horizontal ground, A bird on top of the tree observes the top and bottom of this flag pole below it at angle 45 degrees and 60 degrees respectively, If the tree is 10.65 meters high ,calculate and correct to 3 significance figures the ... 
Math
It will only be ellipse 
ECONOMICS
What is abnormal demand 
Physics
A golf ball hit at a speed of 77 m/s will carry (achieve its maximum flight distance of) 256 m when driven at a launch angle of 16 deg. What would be its horizontal range in a vacuum if launched at the same speed and at the same angle ? 
Physics
A third baseman makes a throw to first base 39.7 m away. The ball leaves his hand with a speed of 37.0 m/s at a height of 1.5 m from the ground and making an angle of 19.5 o with the horizontal. How high will the ball be when it gets to first base? 
Physics
A person rides a motorbike 145 m along a road that slants upward at 4.5 o from the horizontal. How much higher will the rider be at the end of the trip? How far has the rider gone in the horizontal direction? 
chemistry
1. Identify the strongest intermolecular forces present in each of the following: CH3CH2CH3 C6H5NH2 HF SO2 CH3CH2OH NF3 CH3Cl 
Chemistry
A solution of NaOH(aq) contains 7.7 grams of NaOH in 93 mL of solution. Calculate the pH at 25◦C.  7.7 grams x (1 mol/39.997 grams) = 0.19 mol 0.19 mol/0.093 L = 2.07 M pOH = log(2.07) = 0.316  Am I doing anything wrong? Why am I getting a negative pOH/pH ... 
math
243 
AP Chemistry
A saturated solution of CaF2 (of MW 78.0 g/mol) contains 0.0167 grams per liter. What is the solubility product constant of CaF2? 
math
Yeah The large rectangle has an area of (3x2)+(3x5)=6+15=21 Factors of 21 1, 3,7, 21 The large rectangle is 3x7 
math
The 3rd term in an arithmetic sequence is 12, the 7th term is 24, a) How many common differences are there between a_3 and a_7? b) What is the common difference of the sequence? c) What is the first term in the sequence? a_1 d) What is the expression for this arithmetic sequence? 
Math
The solution to f(x)=0 is always the values of x where the graph crosses the xaxis, usually called the xintercepts. Your graph is a Vshaped graph that crosses the xaxis at x=4 on the left and at x=4 on the right. So they are the solutions to f(x)=0. Answers: x=4 and x=+4... 
Math
That's the equation of a parabola opening downward, so the vertex will be the highest point on the parabola, and its xcoordinate will be the value of x producing that highest point. The formula for the xcoordinate of the vertex is b/(2a) = (300)/[2(5)] = (300)/(10... 
math
Round $579 up to $600. Round $85 up to $100. $600$100 = $500. (Notice that the exact answer = $494, so $500 isn't far off from it, and $500 serves the pupose well when you don't have a calculator or pencil and paper or just don't want to take time to calculate it.). 
Math
>>She could paint 5 identical rooms during one 6hour shift.<< So her painting rate was 5 rooms per 6 hours or (5 rooms)/(6 hours) or (5/6)room/hour How long did she take to paint each room? Let the length of time in hours be x Accomplishment = (Rate)(Time) Since ... 
English
Answer A. Rule for writing numbers: Spell out singledigit whole numbers. Use numerals for numbers greater than nine. 
Alegebra
Eleven minus 3 
English
I would for you to overlook my narrative essay, for corrections and your advice. The essay is not finished, but would like to know am I on the right path. A Painful Moment It was the summer of 1998; I was twenty years old celebrating the 4th of July with my brother the day ... 
English
Thank you for over looking my work and giving me confidence. English is not an easy subject for me. 
English
How would I revise this sentence to eliminate unnecessary shifts in tense, mood, voice, or person? The freezing weather is threatening crops such as citrus fruits which were sensitive to cold. The freezing weather threatened the crops, which were sensitive to cold. 
3 grade math
8 boxes of 1000 counters 
maria vazquez
Sonoma winery has fixed cost of $10,000 per year. its warehouse sells wine with variable costs of 80% of its unit selling price. How much in sales does Sonoma need to break even per year? 
science
Which of the following would require more energy to heat it from 10°C to 20°C? a. 200 kg of water b. 200 kg of aluminum c. 100 kg of steel How much heat energy is required to raise the temperature of 20 kilograms of water from 0°C to 35°C? 
3rd Grade Math
Suppose the teacher says to the class: "We're going to play a game and to play it we must have exactly the same number of boys as we have girls. So 9 of you boys will have to go to another room while we play this game." So 9 boys get up and leave the room. That ... 
Math
yes this is off a take home test 
english 3 grade
aphabet on move words 
Science
Based on your knowledge of the relationship between photosynthesis and CO2, explain why CO2 concentrations cycle throughout the year. 
economics
1. $10.20 2. $7.70 
Physics
mass of bottle=35 mass of water=8535=50g mass of kerosene=7535=40g therefore,density of kerosene= mass of kerosene/mass of water= 40g/50g= 4g/5g=1.15 ANS=1.15 g/cm3 
physics
It will not be answered in units of k. It is asking for a force, so the units will be in Newtons. (I assume you meant "kN", which would be kiloNewtons.) The forces acting on the pilot at the bottom of the loop are gravity and the normal force. However, they are ... 
law
How has the feminist movement influenced criminology? What negative impact has resulted from feminism, if any? 
law
What are the policy implications of social development theories? How have these implications been reflected in actual policy, if at all? 
business
what does multitier supplier mean? 
business
Many organizations find themselves in the apparently contradictory position of having high levels of financial investment in inventory, but at the same time frequently running out of stock of important components and materials. (a) explain how this situation could arise. (b) ... 
social studies
what are the main assumptions underlying organizational communication? 
business
i think the supply chain driver is the supplier. And is related to supply chain focus by supplying raw materials to manufacturers who produce finished products. Then the supplier supplies the finished products to wholesalers. My lecturer said i was out of point! It was a ... 
business
define a supply chain driver and show it's relation to supply chain focus with a couple of examples 
Social studies
In what year did Napoleon lead the battle of waterloo? 
MATH
@psydag, sorry for shouting @mathmate, thanks for the solution thank you edwin 
MATH
WRITE A SIMPLE BUT A COMPLETE FORTRAN PROGRAM TO CALCULATE THE AREA OF A TRIANGLE 
MATH
WRITE A SIMPLE BUT A COMPLETE FORTRAN PROGRAM TO COMPUTE THE AVERAGE OF SIX NUMBERS AND DISPLAY THE NUMBERS, SUM AND AVVERAGE. THE PROGRAM SHOULD TERMINATE WHEN ZERO IS ENTERED AS A NUMBER. THE PROGRAM SHOULD BE EDUCATIVE 
MATH
thanks mathmate for your response. we were asked to use WATFOR77 compiler.i'm a newbee as far as programming is concern. can you pls. write the program the way i can run it in WATFOR77? thanks edwin 
MATH
FORTRAN ROGRAM THAT CAN ACCEPT TWO INTEGER NUMBERS AND COMPUTE AND DISPLAY ALL THEIR COMMON PRIME FACTORS 
math
please can u help me for my homework thanks a lot the question is below.. A container is 1/3 full of water and 1/4 full of oil. What fraction of the container is empty? 
College Algebra
3x^212x24=0 
statistics
A study was conducted to investigate the relationship between the cost, y (in tens of thousands of dollars), per unit of equipment manufactured and the number of units produced per run, x. The resulting equation for the line of best fit is given below, with x being observed ... 
geometry
show that points (3,1) (4,2) (1,3) and (2,1) the vertices kiteshaped quadrilateral find its area 
Physics
Sorry typo I meant 180 g apple, I am really sorry 
Physics
Yep its me again... sorry for reposting this question but I am quite desperate here and I need to have this question answered, sorry if that sounds rude. IF 2.0 J of work is done raising g apple how far is it lifted? I know W= Fd hence I divided instead of multiplying and I ... 
Physics (Checking answe)
Sorry for reposting but I need to know if I did it right, please help, I worked out the problem I just want to know if I did it right. A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 52(angle sign here) downward from the horizontal. Find ... 
Physics
A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 52(angle sign here) downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50.0 m length of aisle. Someone tell me if this is right: W= (35.... 
MATH
given ax^2 +bx +c=0. one root is square of the other, without solving the expression proove that: c(ab)^3 = a(cb)^3 
PHYSICS
20 
Math
5^(k+1)  1 =4(m+1) 
math
A straight line AB of length 10 units is free to move with its ends on the axes. Find the locus of a point P on the line at a distance of 3 units from the end on the x axis. 
physics
Three charges of 5 x 10^(6) C are placed on the vertices of an equilateral triangle of 10cm. Calculate force on each charge. 
physics
A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact? 
physics
A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact? 
physics
A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact? 
physics
Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple. 
physics
a fluid flows through a horizontal pipe of varying crosssection. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where crosssectional area is greatest. 
physics
a fluid flows through a horizontal pipe of varying crosssection. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where crosssectional area is greatest. 
physics
If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of the amplitudes of the stationary wave at an antinode and node respectively 2:1 
physics
A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre of AB the bar remains... 
physics
A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one revolution every 4 s, the ... 
physics
A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hit the ground. What is the time interval between the first and second bounces? 
physics
An open tank holds water 1.25 m deep. If a small hole of cross section area 3cm^2 is made at the bottom of the tank, calculate the mass of water per second initially flowing out of the hole. (g=10m/s^2, density of water= 1000 kgm^3) 
physics
A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one revolution every 4 s, the ... 
physics
A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre of AB the bar remains... 
physics
A small piece of cork in a ripple tank oscillates up and down as ripples pass it. If the ripples travel at 0.20m/s, have a wavelength of 15mm and an amplitude of 5.0mm, what is the maximum velocity of the cork? 
physics
In the design of a passenger bus, it is proposed to derive the motive power from the energy stored in a flywheel. The flywheel, which has a moment of inertia of 4.0 x 10^2 kgm^2, is accelerated to its maximum rate of rotation 3.0 x 10^3 revolutions per minute by electric ... 
physics
Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple. 
physics
water flows along a horizontal pipe of crosssectional area 48cm^2 which has a constriction of crosssectional area 12cm^2 at one place. If the speed of the water at the constriction is 4 m/s, calculate the speed in the wider section. The pressure in the wider section is 1.0 x... 
physics
A beam of electromagnetic waves of a wavelength 3.0cm is directed normally at a grid of metal rods, parallel to each other and arranged vertically about 2.0cm apart. Behind the grid is a receiver to detect the waves. It is found that when the grid is in this position, the ... 
physics
A progressive and a stationary simple harmonic wave each have the same frequency of 250Hz and the same velocity of 30m/s. Calculate (i) the phase difference between two vibrating points on the progressive wave which are 10cm apart. (ii) the distance between nodes in the ... 
physics
Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple. 
physics
water flows along a horizontal pipe of crosssectional area 48cm^2 which has a constriction of crosssectional area 12cm^2 at one place. If the speed of the water at the constriction is 4 m/s, calculate the speed in the wider section. The pressure in the wider section is 1.0 x... 
physics
If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of the amplitudes of the stationary wave at an antinode and node respectively 2:1 
physics
A flywheel of moment of inertia 0.32 kgm^2 is rotated steadily at 120rad/s by a 50 W electric motor. (i)find the kinetic energy and angular momentum of the flywheel. (ii) calculate the value of frictional couple opposing the rotation. (iii)find the time taken for the wheel to... 
physics
Water flows steadily along a uniform flow tube of crosssection 30cm^2. The static pressure is 1.20 x 10^5 Pa and the total pressure is 1.28 x 10^5 Pa. Calculate the flow velocity and the mass of water per second flowing past a section of the tube. (density of water= 1000 kg/... 
physics
A small source O of electromagnetic waves is placed some distance from a plane metal reflector M. A receiver R, moving between O and M along the line normal to the reflector, detects successive maximum and minimum readings on the meter joined to it. (a) explain why these ... 
physics
A plane progressive wave is represented by the equation: y= 0.1sin(200pi(t)20pi(x/17) where y is the displacement in millimetres, t is in seconds and x is the distance from a fixed origin O in metres. Find (i) the frequency of the wave, (ii) its wavelength (iii) its speed, (... 
physics
The static pressure in a horizontal pipeline is 4.3 x 10^4 Pa, the total pressure is 4.7 x 10^4 Pa, and the area of crosssection is 20cm^2. The fluid may be considered to be incompressible and nonviscous and has a density of 10^3 kg/m^3. Calculate (i) the flow velocity in ... 
physics
A flywheel with an axle 1.0cm in diameter is mounted in frictionless bearings and set in motion by applying a steady tension of 2N to a thin thread wound tightly round the axle. The moment of inertia of the system about its axis of rotation is 5.0 x 10^4 kgm^2. Calculate (a... 
physics
Find (a) the potential and (b) the field strength at points A and B due to two small spheres X and Y 1.0m apart in air and carrying charges of +2.0x10^8C and 2.0x10^8C respectively. 
math
Find the vector eqn which passes through (1,1,2) and is parallel to the vector which is perpendicular to both 2i+2jk and 3i+2j+k 
science
how to write a program to compute account name, account number and either employed in basis of permanent or cashier labour 
physics
A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact? 
physics
A vibrator attached and resting on the surface of water generates plane water waves and its propagation is found to take 50 seconds to reach a floating cork 65 cm away. If the cork subsequently vibrates with SHM of a period 3.8 seconds, determine the wavelength of the water ... 
physics
A plane progressive wave on a water surface is given by the equation y=2sin2pi(100tx/30) where xis the distance covered in a time t, x, y and t are cm and second respectively. Find (i) the wavelength and frequency of the wave motion. (ii) the phase difference between two ... 
physics
What vibrates in the following types of wave motions (i) light waves. (ii) sound waves. (iii) xrays.