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Posts by Simon

Total # Posts: 175

Math - combinatorics/ permutations
or 254540049, qq , i do homework for students.

Math - combinatorics/ permutations
+852 90603039, whatsapp, i do homework for students.

Physics
(a)-A fossilised tree was tested and contains 10 grams of Carbon-14. Given that there was 12 grams of Carbon-14 present when it died, determine the age of the fossil? Half life of Carbon-14 is 5700 years. (b)How much Carbon-14 will be present in the sample 100 years from now?

math
Bernie has $16000 invested, part at 3% and the remainder at 5%. If the yearly interest on each investment is the same, how much interest does he receive each year?

Physics
A 120kg fridge requires 610N to just move it across the floor, if the coefficient of kinetic friction is 0.2, determine the force required to continue pushing it s constant velocity.

History
Emma, what was it? I need help!

riddle
I would say the answer is Sun,Its Old And New Because Its Has Been There Since Day One And Its Still New Till Today

Dynamics
A car is traveling at a speed of 80 km/h when the brakes are suddenly applied, causing a constant deceleration of 3.24 m/s2. Determine the time required to stop the car and the distance traveled before stopping

physics
Acceleration of a Mass in a Pulley System Block 1 of mass m1 slides on a frictionless plane inclined at angle ? with respect to the horizontal. One end of a massless inextensible string is attached to block 1. The string is wound around a frictionless movable pulley P of ...

intermediate maths
James is six times as old as his granddaughter, Louise. In two years time he will only be five times as old as Louise. How old are James and Louise now?

physics
A car of mass m is going around a circular turn of radius R, which is banked at an angle β with respect to the ground. Assume there is friction between the wheels and the road. Let μs be the coefficient of static friction and g the magnitude of the ...

Maths
Hey! I have this problem - i'm currently working on Quadratics at school, and i got homework. One of the questions is 18^2+2px+32. I have to find the Value of P, the answer i got is P>+-24. Can someone please confirm this is correct?

Maths
What is the next number in the series? 0 1 5 14 30 __

Maths
Amy and Ashley bike along the same trail. Amy bikes the entire trail at a speed of 20 mph and Ashley bikes it at a speed of 15 mph. Amy finishes biking the entire trail 8 minutes before Ashley. How many miles long is the bike trail?

Algebra
Ann, Matt and Zack are working for a cleaning company. Together, they can clean a house in 2 hours. If Ann does the job alone she can finish it in 5 hours. If Matt does the job alone he can finish it in 6 hours. How long will it take Ann and Zack together to finish the job?

algebra 1
The function H(t) = −16t^2 + 90t + 50 shows the height H(t), in feet, of a projectile after t seconds. A second object moves in the air along a path represented by g(t) = 28 + 48.8t, where g(t) is the height, in feet, of the object from the ground at time t seconds. Part...

algebra 1
The function H(t) = −16t^2 + 90t + 50 shows the height H(t), in feet, of a projectile after t seconds. A second object moves in the air along a path represented by g(t) = 28 + 48.8t, where g(t) is the height, in feet, of the object from the ground at time t seconds. Part...

life orientation
Design a newspaper article to warn people against engaging in fraud and corruption

Math - Normal and Binomial Distribution
An unbiased dice is thrown 10 times. Let X be the number of sixes obtained. Find: C) P(X<mean) The correct answer is .485, but I don't know how to get there. I tried

science
How does graphite burn in air to give carbondioxide

Physics
A ball of mass m1=3kg moving south at 6m/s collides with a ball of mass m2=2kg initially at rest. The incoming ball is deflected in the direction 60 degrees S of W and the target ball moves off at 25 degrees E of S. Consider that the Collison happens on a horizontal plane and ...

English- Ms.sue Helllppppppp
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Physics
3)-A 9-kg block is held by a pulley system shown in fig. What force must the person exert in the following cases: a) to hold the block at rest. b) to lower it at 2m/s. c) to raise it with an acceleration of 0.5 m/s2? Ignore the mass of small pulley.

PHYSICS HELP
3)-A 9-kg block is held by a pulley system shown in fig. What force must the person exert in the following cases: a) to hold the block at rest. b) to lower it at 2m/s. c) to raise it with an acceleration of 0.5 m/s2? Ignore the mass of small pulley.

PHYSICSS HELP
3)-A 9-kg block is held by a pulley system shown in fig. What force must the person exert in the following cases: a) to hold the block at rest. b) to lower it at 2m/s. c) to raise it with an acceleration of 0.5 m/s2? Ignore the mass of small pulley.

Algebra 1
A contestant on a quiz show gets 50 points for every correct answer and loses 100 points for each incorrect answer. After answering 24 questions, the contestant has 300 points. How many questions has the contestant answered correctly? Incorrectly? Use models, pictures, ...

Math
Could someone explain the concept of "magic numbers" in reference to baseball as an indication of how close a team is to clinching the division title and how to calculate it?

math
dont know help

Edu tech
Can you please check this Probability can be used to determine the likelihood of specific ________. A:games B:occurrences C:questions D:opportunites D is my answer

Science
Why is the use of the inquiry process a practical way to approach science? 5 points My Answer: The inquiry process is a practical way to approach science because the inquiry process begins by asking questions and moving on from there. In science it is important to investigate ...

physics
A student observes an airplane fly overhead with a constant velocity parallel to the x-axis at a height of 7.60 × 103 m. At time t = 0 the airplane is directly above the student, the vector P~ o = 7.60 × 103ˆj m describes the position on the airplane with ...

mathematics
Two towns T and S are 300km apart, two buses A and B started from town T at the same time moving towards town S, Bus B traveling at speed 10km/h greater than bus A and reached S 1 1/4 hours earlier. Find the average speed of A? How far was Bus A from T when bus B reached Town S?

math
square root(64)=8 ans=8ft

math
letting x be the age of frank y be the age of beth; x+y=23......(equation 1) x-y=7 .......(equation 2) using substitution method, x=7+y (7+y)+y=23 7+2y=23 2y=23-7 2y=16 y=8 x=7+8 =15 frank (x)=15years beth (y) =8years

Mathematics
50 miles used 2 gallons 298 miles 298×2=596 596÷50= 11.92 gallons

Physics
A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 36.8 m/s. At the same time, it has a horizontal velocity of 52.6 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s. At what angle with the ...

Physics
For anyone finding this in the future, Ryan has the correct answer.

English
Writing Skills: A Research Project, you are asked to compose an essay responding to ONE of the prompts offered. At its base, this is a personal essay, but you must incorporate research that will support your views and opinions. The core of this essay must be based solely on ...

language arts
which element is shared in both zoos joys or jails and why do we need zoos?

Math
Hi I'm having a bit of trouble if anyone is able to help, thanks! Using the substitution u =1-2t^2, show that A = -1/4 ∫_1^(-7)▒e^u du

math
about powers and roots

math
The dissipation of heat through a composite material of width w centimetres can be modelled by the function f(w) = 10/w - 0.77ln(w) – 3.2 You are required to find the width of material that will prevent any heat dissipation. - I understand f(w)= 0, but I'm unsure of ...

Physics
On June 9, 1988, Sergei Bubka broke the world pole-vaulting record for the 8th time in four years by attaining a height of 6.14 m. How long did it take Bubka to return to the ground from the highest part of his vault?

Organic Chem Help
Can someone explain how crystallization works to produce a product that is purer than the input material. Thank you!

Math
the larger angles of a rhombus are twice the smaller angle of the rhombus. if the shorter diagonal is 20, find the perimeter of the rhombus

Hypothesis Test
A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random sample of 120 ...

American history
The religion that is sometimes called Central America is actually apart of what continent.?

MGMT303
1. (TCO 2) Organizations have both an internal and an external environment. Describe the general environment and give at least one specific example of each dimension, other than the examples given in the text and in the lectures

physics
A star rotates in a circular orbit about the center of its galaxy. The radius of the orbit is 4.4 x 1020 m, and the angular speed of the star is 7.3 x 10-15 rad/s. How long (in years) does it take for the star to make one revolution around the center?

physics
In the figure the man hanging upside down is holding a partner who weighs 535 N. Assume that the partner moves on a circle that has a radius of 6.50 m. At a swinging speed of 3.75 m/s, what force must the man apply to his partner in the straight-down position?

physics
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 29 N. Starting from rest, the sled attains a speed of 2.1 m/s in 9.6 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

ECONOMICS
WHAT ARE WELFARE PAYEMENTS OR CONSUMERS SUBSIDIES

math
A stadium is divided into 8 sections. Each section has 72 rows and each row contains 25 seats. How many seats are in the stadium.

Pharmacy
You have a 10 percent solution and your wanting to treat a patient weighing 4.5 pounds and the dose is 5mg/kg/ml. What is the dose?

Calculus
Use the limit process to find the area of the region between the graph of the function and the x-axis over the indicated interval. Sketch the region. y=2x-x^(3), [1,3]

Calculus
On the moon, the acceleration due to gravity is -1.6 meters per second per second. A stone is dropped from a cliff on the moon and hits hits the surface of the moon 20 seconds later. How far did it fall? What was its velocity at impact?

Life orientations
Discuss 5 impacts due to lack of infrastructure

economics
WHAT ARE WELFARE PAYMENTS OR CONSUMERS SUBSIDIES

Life orientation
Five practices that are in Contravention of the Basic conditions of employment Act

Economics
no

math
a box contain 60 oranges.3/5 of the oranges were equally shared among 4 boys.how many oranges did each boy received.

Math
Tiles is 2000cm bt its ans is wrong

Math
In evening my test plz help me to solve it A room length 3m,20m wide and 6m height. Find the floor is to be tiled.if each tile measures 60cm*50cm,find the no. Of tiles required.

Math
Bt its ans 6166.16cm^3

Math
The cross section of a pipe of length 49cm.the thicknes of the pipe is 1cm4mm and the outer diameter is 30cm.find the volume of the pipe.

Math
Water is poured into cuboidal container at the rate of 80liter per min. If the volume of container is 144m^3,find the no. Of hours it takes to fill the reservior.

Math
Plz help me

Math
Bt its ans is 1816.32cm^2

Math
A cylindrical tube is open at both ends.the internal diameter tube 10.4cm and its length is 25cm. If the thickness of the tube 8mm everywhere,find the total surface of area of the tube.

Math
A box measures 60cm*52cm*40cm.find the area of the cardboards required to make 280 such boxes.

Math
Thank you

Math
The radii of two cylinders 3:2 and height 7:4.find the ratios of their curved surface area.

Math
Please tell me how to solve it

Math
This is math qustn plz help me to solve it bcz tmrw my test soreply soon as soon A box measures 60cm*52cm*40cm.find the area of the cardboards required to make 280 such boxes.

Math
Thanx..

Math
This is math qustn plz help me to solve it bcz tmrw my test soreply soon as soon A box measures 60cm*52cm*40cm.find the area of the cardboards required to make 280 such boxes.

chemistry
Elemental zinc will react with acid to evolve hydrogen gas. This is a redox reaction. Write a balanced molecular equation for the reaction of zinc and hydrochloric acid, showing the coefficents and the phases of all reactants and products. Below is an example of the form of ...

chem
I2 + 5 Cl2 + 6 H2O 2 HIO3 + 10 HCl What is the reducing agent? In your answer give the element symbol and oxidation state.

chemistry
balance: Al2(CO3)3 --> Al2O3 + CO2 i don't know how to do the reactant side so i can figure out the product side...

math
started with= 5 min quarter= 75 min dime = 30 min nickle= 15 min add all the minutes then add to 9:00 am

chemistry HWK MAKES NO SENSE
Thank you!

chemistry HWK MAKES NO SENSE
balance: H3PO4 + Mg(OH)2 → Mg3(PO4)2 + H2O

chem
what is the number of moles of manganese (II) iodide in a sample whose mass is 650 g?

math exam tommrow review
-15p+6 solve for p? -15p+6=0 so 15p=6 p=6/15 or 2/5

physics
A 500N force is applied to a 25 kg block and accelerates it at 15 m/s^2. What is the force of friction?

science
A reaction took place between a magnesium and florine in a large empty container if attraction and repulsive between these atom are equal at a distance of 0.001*10^-10m, calculate the couloumbic force between two atoms.

Chemistry (Insulated Vessel, temperature and vol.)
Insulated vessel has two compartments separated by a membrane. One side is 1 kg of steam at 400 C and 200 bar. The other side is evacuated. The membrane ruptures filling the entire volume. The final pressure is 100 bar. Determine the final temperature of the steam and the ...

Chemistry (Internal Energy)
5 kg of steam contained within a piston-cylinder assembly undergoes an expansion from state 1, where the specific internal energy U(1) is = 2710 [kJ/kg] to state 2, where U(2) = 2660 [kJ/kg]. During the process, there is heat transfer to the steam with a magnitude of 80 [kJ]. ...

physics
Calculate the power required of a 1190 kg car as it climbs a 11° hill at a steady 103 km h-1. The total friction and air resistance is 700 N. Answer in kW, to the nearest whole number.

physics
A skier travelling at 14 m s-1 reaches the foot of a steady upward 14° incline and glides 21 m along this slope before coming to rest. What was the average coefficient of friction?

physics
Total mechanical energy of a flying rubber ball is 2000 J. It has a velocity of 151 ms-1 and is 3.1 m above the ground. Find the mass of the ball. (2dp)

physics
A boy is sledding down a slope that is inclined at 30.0° with respect to the horizontal. A moderate wind is aiding the motion by providing a steady force of 108 N that is parallel to the motion of the sled. The combined mass of the boy and sled is 53.6 kg, and the ...

science
how many seconds will it take for a saterllite to travel 450 km at rate of 120 m/s?

Chem-E / Chemistry
Calculate the rate of heat required to bring 1.80mol/hr of HBr gas from 37.0 C to 434.0C at atmospheric pressure (Heat capacity of HBr is described by eq.) Cp (kJ/mol * C) = a + bT + cT^2 + dt^3 T is in C and HBr - a = 2.910x10^-2, b= -2.27x10^-7, c= 9.887x10^-9, and d= -4....

Chemstry
Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min. The air leaving the liquid is saturated with water at 25 degrees celcius and 1.5 atm. How long it will take for all of the water to vaporize.

Chemistry
Find the volume, in L, of 100g gas mixture containing 10.0 mol% hydrogen in nitrogen at 30.0C and 5.00 atm. Use the avg molecular wt. what is the molar concentration of hydrogen, in mol/L, in the gas mixture? what is the average mass denisity in g/L

Chemistry
semibatch reaction: C6H6(l) +Cl2(g) ==> C6H5Cl(l) + HCl(g) C6H5(l) + Cl2(g) ==> C6H4Cl2(l) + HCl(g) C6H4Cl2(l) + Cl2(g) ==> C6H3Cl3(l) + HCl(g) \reactor contained 11.0 mole of benzene and a product mixture in which the amt of mono-chlorobenzene was 3x the amt of ...

Chemstry
For the reaction A(g) + B(g) <==> C(g) + D(g) the equilibrium constant K is defined as K = Y(sub y) * Y(sub D) / (Y (sub A) * Y(sub b)) where y is the molar fraction of the gas phase of a species At 620.00 K, the equilibrium constant is 1.100. Suppose the feed to a ...

Chemistry
Distillation Scale up: In an experiment 100 lb-mol of 47 lb-mol % ethanol, 53 lb mol % water sol'n is fed into distillation column and separated into two streams: 100lb-mol 0.470 lb-mol ethanol 0.530 lb-mol water goes to: steam 1: 17 lb-mol 0.890 lb-mol Ethanol 0.110 lb-...

math
ralph would like to make a spinner with three diffrent colored regions so that a person would expect to spin the first color half the time,the second color one-third of the time,and the third color one-fourth of the time.is it possibe to make a spinner?Explain

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