# Posts by emmanuel

Total # Posts: 182

**math**

If an aircraft flies on a bearing of 120 degrees from point A to B, what bearing should it take to fly from B to A?

**Archimedes principle**

An iron piece of mass 360g and a density of 6g/cm^3 is suspended by a rope so that is partially (halfway)in oil of density 0.9 g/cm^3.Find the tension (force) in the string.

**bio**

How Does exponential growth affects the 5 scientific principles of sustainability,reliance of solar energy,biodiversity,population control and nutrient recycling

**Angles of elevation and depression**

The teet of two vertical poles of height 3m and 7m are in line with a point P on the ground. The smaller pole being between the taller pole and P and at distance of 20m from P the angle of elevation of the top T of the taller pole from the top R of the smaller pole is 30°....

**Physical science**

Which of the following homogeneous and which are heterogeneous? Blood, carbon dioxide,Rock, steak,iron, concrete, air,oxygen, salt, milk.

**phy 101**

if he travels 7km N 30 degree E and 10km east find the resultant displacement

**math**

john's age in the next ten years will four times his age five years ago. How old is john now?

**pysics **

three identical point charges each Q coulombs are placed at the vertices of an equilatwral triangle 20cm apart.calculate the force on each charge

**Math**

A commuter plane flies from City A to City B, a distance of 90 mi due north. Due to bad weather, the plane is redirected at take-off to a heading N 60° W (60° west of north). After flying 57 mi, the plane is directed to turn northeast and fly directly toward City B. To...

**Physics**

A stone, 2kg is projected vertically at a velocity of 5m/s at an Angle of 60° Calculate I.Time taken to attain maximum height II.maximum height reached III.The range

**chemistry**

A metal x form different chlorides.If 12.7g of chloride A and 16.3g of chloride B contains 7.1g and 10.7g of chlorine respectively show that the figures agree with the law of multiple proportions. write their formular

**maths**

A bicycle has a radius of 28cm How far does it travel in four complete turns

**physics**

A catapult used to hold a stone of mass 500grammes is extended by 2cm with an applied force F. if the stone leaves with a velocity 40ms-1, the value of F is.

**chemistry**

how many unpaired electrons are in this configuration 1s2 2s2 2p6 3s2 3p3

**chemistry**

how many unpeeled electrons are in this configuration 1s2 2s2 2p6 3s2 3p3

**Science **

What is the effect on molarity for NaOH when balance used to weigh KHP is not properly calibrated and always reads 0.15 g too low.

**maruco**

The electrons in the d–orbitals – are they from the metal or the ligands.why?

**marian university college**

The molar constant-pressure heat capacity of a certain solid at 4.2 K is 0.43 J K?1 mol?1. What is its molar entropy at that temperature?

**mathematics**

LA

**english**

Whose cake is the best

**0.5mols of a monoalkanoicacid weighs 44 grams, determine the molecular formula and name the acid. (show the workings)**

0.5mols of a mono alkanoicacid weighs 44 grams, determine the molecular formula and name the acid. (show the workings)

**chemistry**

0.5mols of a mono alkanoicacid weighs 44 grams, determine the molecular formula and name the acid. (show the workings)

**maths**

Eric is twice as old as Ernest, who in turn is 5 years older than mike.if their total age is 47 years, how old is each of them?

**Mathematics**

A stick is 203cm long. The stick is cut into n pieces, each the same length. What is the length of each piece?

**Science**

The efficiency of a machine is 80%.calculate,the amount of energy needed by the machine to do work of 150joules.

**Physics**

A projectile leaves the ground at an angle of 60degree to the horizontal.it initial kinetic energy is E. Neglecting air resistance, it kinetic energy at the highest point of the motion is

**Physics**

A bullet is fired horizontally from the top of a cliff with a speed of 30m/s.assuming that there is no air resistance, what will be its speed 3sec later?

**PHYSICS**

A mass of 2kg is dropped from a height of 3m.Neglecting air resistance,KE of the stone just b4 it hits the ground is ?

**chemistry**

60 cm of hydrogen diffused through a porous membrane in 10 minutes. The same volume of gas G diffused through the same membrane in 37.4 minutes. Determine the relative molecular mass of

**science**

A block of wood is weighed on a beam balance.its mass is 54g.The density of the block is1.8g/cm`3.Find volume

**science**

A measuring cylinder contains 50cm`3 of water.A stone has a mass of 1.75g.The stone is lowered into the cylinder, the level of the water rises to 52.5cm`3.Calculate the density of the stone

**MATH**

FIND THE LENGTH OF AN ARC ANGLE IS 60 DEGREE AT THE CENTRE OF A CIRCLE OF RADIUS 3CENTIMETRE

**Maths**

A ladder leans against a vertical wall of height 12m.if the foot of the ladder is 5m away from the wall,calculate the length of the ladder.

**Maths**

A box contain 40 pens of equal sizes.10 of them are green and 18 are red.if a pen is chosen at random from the box,what is the probability that is neither green nor red? Soln total number of pens=40 number of green pens=10 number of red pens=18 number of other pen=? =10+18=28...

**science**

what is the length of a simple pendulum that has a period of 2.8 seconds (g=10)

**Mathematics**

. The three consecutive terms of an exponential sequence (G.P) are the second, third and sixth terms of a linear sequence (A.P). Find the common ratio of the exponential sequence.

**maths**

Find the median of 3,6,10,13, 14,17,19 and 22

**math**

Find the lenght of a rectangle if the perimeter is 48 and width is 8

**Further maths**

The first term of an AP is equal to thrice the common difference. What is the sixth term of the AP,if the common difference is 8

**Further math**

209

**Science**

its B

**Economics**

The answer of number one is 1.25

**algebra**

prove that if U and W are vector subspaces of a vector V, then UV, is a vector subspace of V

**algebra**

how can i proove that every vector norm on C subscript n is continuos in the vector components the set of complex numbers

**algebra**

let V=R^3 and S={e1,e2,e3}.prove that S is a basis of V

**algebra**

let V be set of all functions with down R which are such that f(t)=Acost +Bsin t,t c R, where A and B are real numbers. define addition in V by (f+g)(t)=f(t)+g(t) and scalar multiplication by (¥f)(t)=¥(f(t)),¥€R.prove that V is a vector space over R

**science**

3 identical point charges each one micro coulomb placed at vertices of an equilateral triangle 10cm apart calculate the force on each charge

**sequence help!!!!! plz steve,reiny,damon,bob...anyone!!!!**

find the expression in terms of n of the nth term of following squences 5,13,32,69,129,221....help plz show it work

**sequence....help!!!!!**

find an expression in terms n of the nth term of the following sequence 5,13,32,69,129,221......help

**chemistry**

Please I need a detailed explanation, am stuck doing this assignment, at what temperature in kelvin will co2 molecules have an rms speed equal to hydrogen at 20 Celsius?

**maths**

The position vector of m in the same plane are as the point a and b is given by m=1÷2(a+b).if the vector A(-4,-3),B(2,-1).What is the direction and the relationship of vector AM and vector BM

**anty alice**

graph of 5x-2y=6 value=0=2

**anty alice**

graph of 5x-2y=6 value 0=2

**Math**

Out of 300 student in final year in senior secondary school, 200 are offering biology and the150 offering chemistry how many are offering neither biology nor chemistry

**Word problem algebra**

Steve the builder was plastering a wall while standing on a ladder..he noticed that the number of rungs/steps below,the rung he was standing on was 1/3 of the numbers of rungs above where he was standing. Then he climed another 10 rungs/steps and he also notice that the number...

**Blessed lord sir steve i don't get it**

How did you come ot x/2=A?

**Trigonomentry help plz!!!**

Sin3A=3sinA-4sin(x/2)^3 find x interms of A? PLZ show working got no ideal at all

**Calculus help**

Y=|X^2+3x-4| find dy/dx?

**Math**

Solve 3 - x = √x2 - 5 . State any extraneous roots that you found. Identify the values of x for which the radical is defined.

**Math**

a)Write a function o represent the area of the rectangle. one side - 5x+15 other side - 31-2x b) Graph the function- lebel x and yint c)what dp the x-intercepts represent in this situaltion? d)Does the funtion have a maximum value in this situaltion? Does it have a minimum ...

**computer simulation**

A grocery store has three checkout lanes (checkout 1, 2, and 3), each with a single checker. Shoppers arrive at the checkout area with interarrival times having an exponential distribution with mean 2.4 minutes. The shoppers enter the lane that has the fewest number of other ...

**phomolong secondary school**

i am a grade 11 learne,i cant choose the that is good for me from the following subject history,geography,life science,sepedi,life orientation,english,math literacy.

**Spanish**

Elena packed 48 cubes into this box each cube has edges that are 1 centimeter how many layers of cubes did elena 5?

**igbo**

what is adverb called in igbo

**math**

the electron beam in a television tube consists of electrons accelerated from rest through a potential difference of about 20000v.what is the speed of the electrons?(ignore relativistic effects).electron rest mass is 9.11 X 10^-31kg and electron charge is 1.6 x 10^-19

**science**

D=150mm =0.15m t=2mm =0.002m T=400MPa =400E6Pa T=F/Al F=TAl =T*Pi*D*t =400E6*3.1416*0.15*0.002 =376911.12N =376.9KN

**Physis**

S=1/2*g*t*t, h=1/2*10*7*7 h=5*49=245m

**Math**

Wilma drove at an average speed of 35 mi/h from her home in City A to visit her sister in City B. She stayed in City B 15 hours, and on the trip back averaged 40 mi/h. She returned home 41 hours after leaving. How many miles is City A from City B?

**science**

A body of mass 20kg moving with a velocity of 8m/s collides with a stationary body of mass 10kg and the two stick together.They then move with a common velocity V.Find the value of V.

**better days**

a ball thrown vertically from the ground level hits the ground after 4secs.calculatethe maximumheight it reachedduringit's journey.(g=10m/s2)

**physics**

a stone projected horizontally from the top of a tower with a speed of 4m/s lands on the level ground at a horizontal distance 25m from the foot of the tower. calculate the height[g=10m/s2]. is it u squared divided by 2g

**Science**

9. The Pleistocene Epoch, from 1.7 million years ago to 10 000 years ago, was marked by A. a lack of oxygen B. the presence of warm, tropical seas C. the southern movement of the North American continent D. the formation of glaciers that covered parts of the Northern ...

**Science**

A skydiver steps out of a helicopter hovering thousands of metres above ground. After 3.5 s of free fall the skydiver pulls the rip cord. What is the skydiver’s displacement during the 3.5 s of free fall?

**Science**

A baseball flew 19.6 m straight up into the air after being hit by a bat. How long should it take for the ball to return from its maximum height? A. 1.02 s B. 1.91 s C. 2.00 s D. 3.99 s

**Science Help Not sure**

A traffic-safety engineer is designing a deceleration lane. She is basing the length of this lane on the distance needed to slow down from 126 km/h to 65 km/h in 8.0 s. How long will the deceleration lane be? A. 2.1 x 10^2 m B. 3.8 x 10^2 m C. 4.2 x 10^2 m D. 7.6 x 10^2 m

**Science**

Starting from rest, an object rolls down a long ramp with a constant acceleration of 1.72 m/s2. After rolling for 4.75 s, what is the magnitude of the ball’s final velocity? A. 9.81 m/s B. 8.17 m/s C. 6.30 m/s D. 4.09 m/s

**Science Help Not sure**

Within the Gaetz Lake Sanctuary in Red Deer, Alberta, is a looped trail that is 4 km long. Suppose a person walked all the way around the looped trail in 1 h, ending where he or she started. Which statement best describes this person’s motion over this time interval? A....

**science**

A vehicle is travelling 1.0x10^2 km/h. what is the spped of the vehicle in metres per second? 28m/s 27.8m/s 3.6x10^2m/s 1.0x10^4m/s

**Science**

whats the difference between average speed and instantaneous speed?

**Science**

1.The sound from a bolt of lighting travelled 4.08km in 12.0s. whats was the spped of the sound in metres per second? 0.340m/s 49.0m/s 340m/s 343m/s 2.A vehicle is travelling 1.0x10^2 km/h. what is the spped of the vehicle in metres per second? 28m/s 27.8m/s 3.6x10^2m/s 1.0x10...

**Science**

which of the following is not scalar quantity. 0.20m 5.0m/s 10.0m/s[E] 110km/h

**physics**

a car travels at uniform velocity of 20m/s for 5 seconds, the breaks are then applied and the car comes to rest with uniform retardation in further 8 seconds. draw a graph of velocity against time.How far does the car travel after the breaks are applied.?

**Economic**

Using Simpson role to find the denvatives of x=(y²+3x+7) (x²-4)

**math**

ref to the question above to rewrite 2/5, 1/6 and 1/3 in ascending order : I think we first find the common denominator which is 30 then 2/5 is the simplified fraction of 12/30, 1/6 is also the simplified fraction of 5/30 and lastly10/30 has been simplified to get 1/3. from ...

**life orientation**

Explain in a short paragraph what can trigger spectator aggression in sport .

**Math**

Show three ways to make 0.60 without using pennies

**english**

define literature

**Statistics**

For $5 you can buy a ticket for a drawing for a prize of $2,000. The probability of winning the prize is 0.001. How much money to you expect to win

**Physics**

The position of a point A is specified as A (5.7).the y-coordinate is ?

**physics**

The standard piece of apparatus used to measure distance in the laboratory is what?

**physics**

The S.I. Unit of displacement is what?

**maths lit,geography,tourism,business studies,l.o**

yes i passed them with good grades

**Math Plz dont ignore Plz**

what do you mean show my work. do you mean show what i have done, if i don't know the question how can i show my work? i just need to know how to do it. so i can practice on it.

**Math Plz dont ignore Plz**

The Eskimos are trying to generate more money because player wages are increasing. they have came up with a couple of plans: Plan 1 : they are going to open up 1850 new seats in the endzone that will be reserved for family seating. they project that they will, on average, get ...

**math**

The Eskimos are trying to generate more money because player wages are increasing. they have came up with a couple of plans: Plan 1 : they are going to open up 1850 new seats in the endzone that will be reserved for family seating. they project that they will, on average, get ...

**astronomy**

it will be less than 365 days for sure, because without the sun earth will be spinning fast

**Any math tutor online? Help**

ik you cant graph here, but plz can you tell me the x and y intercept so i can do the grpgh

**Any math tutor online? Help**

Two companies charge these rates for printing a brochure : Company A charges $175 for set up and 0.10 pet brochure Company B charges $250 for set up and 0.07 pee brochure A linear system that model this situation is C=175 + 0.10n C =250+ 0.07 Where c is the total A) graph the ...

**Any Math Tutor Online? Help**

thx but do you think c) is right? what about the 6

**Any Math Tutor Online? Help**

man on 12m tower, he observed two houses. the angle of depression to one of them was 6' and the other is 3'. how far apart the houses are. Calculate the distance between the house if: a)the houses are on the same side of the tower b)the houses are on opposite sides of ...