Farah

Writing variables and hypothesses What about them? i don't even understand them and i have to make up 4 variables and hypothesses about independent and dependent variables i don't even understand them and i have to make up 4 variables and hypothesses abou...

19 years ago

How oil is obtained?

17 years ago

What is cultural landscape analysis?

16 years ago

A car of mass 600 kg is travelling at 10m/s. when brakes are applied, it comes to rest in 10 M. what is the average force exerted by the brakes?

15 years ago

how does a cloud that is charged with electrons form? What is the charge (positive or negative) of such cloud?

15 years ago

A particle accelerated by a potential difference enters a velocity selector. The particle travels staright when the magnetic field is 0.400 T and the electric field is 6.30 x 10^5 V/m. Once the electric field is turned off, a sensor determines that the ra...

15 years ago

find the 1st derivative of f(x) = x/(x-1)2 Is the 1st derivative f'(x)= -x-1/(x-1)^3

14 years ago

What is the centripetal acceleration of a satellite orbiting Saturn at the location exactly on Saturn radius above the surface of Saturn

14 years ago

The planet Neptune has gravitational field intensity of 10.3nékg at a height of 1.00*10?6m above its surface. If the radius of Neptune is 2.48*10?7m, what is its mass

14 years ago

a) Do you believe that some current accepted scientific models or theories might be held in high regard because of the structure of the scientists who proposed them? b) Suggest on possible model or theory that is currently accepted by a majority of people...

14 years ago

Describe how the wavelets that form in the wavefront apparently vanish behind it?

14 years ago

Sound, a form of energy can be modeled by using two distinctly different approaches. a) Describe the propagation of sound energy through air by discussing the motion of individual particles. Include possible mathematical equations that might apply. Ans: S...

14 years ago

y=8cos((1/2)x)+10 dy/dx = -4sin((1/2)x) What is the maximum slope from 0 - 4(pi)? I tried equating the endpoints, but it does not work, can someone teach me how to find maximums and minimums?

14 years ago

a) Find an equation of a line that is tangent to y=2sinx and whose slope is a maximum value. b) Is there more than one solution? Explain.

14 years ago

Please give me loads of examples of socio-cultural norms

14 years ago

For a double-slit interference, what would happen to the distance between the bright fringes if you: a) Decreased the distance between the slide and the screen b) Increased the separation between the slits c) Decreased the distance between the laser appar...

14 years ago

a) Describe the emission spectrum of a hydrogen discharge tube b) Explain why different color lines appeared in different position in the spectrum. Use a suitable atomic model to help construct your answer. c) Explain how do you decide if the lines observ...

14 years ago

A Pyrex flask in a refrigerator at -8 degrees Celsius is filled to the top and holds exactly 1000cm^3 of ethyl alcohol. If the refrigerator fails, how much alcohol spills by the time the temperature reaches 22 degrees Celsius? The coefficient of volume ex...

14 years ago

An oceanographer measured a set of sea waves during a storm and modelled the vertical displacement of waves in meters using the equation h(t)=0.6cos2t+0.8sint, where t is the time in seconds. a) Determine the vertical displacement of the wave when the vel...

14 years ago

h(t) 0.6cos(2t) + 08 sin(t) h'(t) = v(t) = -1.2sin(2t) + 0.8cos(t) find the vertical displacement when the velocity is 0.8m/s how do i solve v(t) = 0.8m/s I tried the normal way by equating and factoring, however two answers are obtained and the second me...

14 years ago

Let f(x)= (1/b)^x for b>1, and left g(x) = (f'(x))/(f(x)) a) Predict the shape of the graph of g(x). it will be a straight line, since ln(1/b) will be a constant b) Test your prediction by exploring two specific cases. Values of (1/2) and (1/10) c) Summar...

14 years ago

a) Find a function y=f(x) that satisfies the differential equation dy/dx = fifth derivative. This is one of the questions in my practice test, I tried the basic equation of the trig function such as f(x)= sin(x) or f(x)=-sin(x) however in the fourth deriv...

14 years ago

A sharpshooter shoots the bullet horizontally over level ground with a velocity of 300m/s. At the instant that the bullet leaves the barrel, its empty shell casing falls vertically and strikes the ground with a vertical velocity of 5m/s. How far does the...

14 years ago

A star at the edge of the Andromeda galaxy appears to be orbiting the center of that galaxy at the speed of about 200km/s. The star is about g*10^9AU from the center of the galaxy. Calculate a rough estimate of the mass of the Andromeda galaxy. Earth orbi...

14 years ago

The mass of a uranium-238 atom is 3.95*10^-25kg. A stationary uranium atom emits an alpha particle with a mass of 6.64*10^-27kg. If the alpha particle has a velocity of 1.42*10^4m/s, what is the recoil velocity of the uranium atom. Ans: i tried MaV'a = -M...

14 years ago

A student flings a 23g ball of putty at a 225g cart sitting on a slanted air track that is 1.5m long. The track is slanted at an angle of 25deg with the horizontal. If the putty is traveling at 4.2m/s when it hits the cart, will the cart reach the end of...

14 years ago

In a head dip bungee jump from abridge over a river, the bungee cord is fastened to the jumpers ankles. The jumper then steps off and falls towards the river until the cord becomes taut. At that point, the cord begins to slow the jumper's descent, until h...

14 years ago

If a sled reaches the base of the hill with a speed of 15.6m/s, how much work was done by the snow on the sled between points x and y, where x is 3m above the ground with a velocity of 14.30m/s and y is toughing the ground. the sled and the rider are 70kg...

14 years ago

Points A and B are 13.0 apart. A charge of +8.0mu is placed at A and another charge at +5.0mu is placed at B. Point P i located 5.0cm from A and 12.0cm from B. What is the magnitude and direction of the electric field intensity at P? Ans: i got the magnit...

14 years ago

A 1.5kg melon is placed on top of the post. A girl lying on the ground fires a 500g arrow at ground level with velocity of 20m/s, 60deg above the horizontal, and hits the melon when the arrow is at its highest point. The melon, with the arrow embedded, fa...

14 years ago

A beam of electron is accelerated by a potential difference of 2.5okV. The electrons are then allowed to pass into a magnetic field of strength 10.0mT. As the electrons enter the field, the direction of the velocity is at right angles to the direction of...

14 years ago

I need some continuities and changes in economy in the islamic world from 600-1750 AD, please help? Just a list would be fine with me thank you!!! :D

14 years ago

The molar mass of cupric chloride is 134.45g/mol. What is the mass, in grams, of 8.19*10^-3 mol of this compound?

14 years ago

Calculate the density of earth and the density error. i got the answer 5.57*10^3k +/- 9.60 *10^7kg/m is that the correct answer? please help

14 years ago

Calculate the density of earth and its density error d=m/v where m = 6.00*10^24kg and v = (4/3)(pi)(6359000)^3 = 1.07709...*10^21 m^3 therefore d=6.00*10^24/1.07709...*10^21 m^3 d = 5570.5254...kg/m^3 using the sig fig rule, in division and multiplication...

14 years ago

Use Amending formula, rule of law and civil law individually in sentences. Please help me form sentences, i cannot crack my brain around these three.

14 years ago

The following data lists the ionization energies for a given atom: IE1 = 738Kj/mol; IE2 = 1451Kj/mol; IE3 = 7733Kj/mol. Predict the valence electron configuration for this atom, and explain your reasoning. i do not understand this question but i will give...

14 years ago

On which side of the periodic table would you find an element whose atom is likely to form a cation? Which atom property is related to this question? Ans: is it the right side of the periodic table that you would find the elements whose atom are likely to...

14 years ago

Draw Lewis structures for each of the following ion: CO3 (2-) I tried this method below, i do not know where am i going wrong, please help me understand this concept for ions. Valence Electrons 4e- + 18e- = 22e- Noble gas Config 8e- + 24e- = 32e- Total 32...

14 years ago

I am asked to draw lewis strcutures of the following molecules and ions SF6, BrF5, XeF4, PF5 and IF4-. I have to follow a specific format to draw them, below is an example of SF6, where am i going wrong in the table, since i am not getting six bonds, nor...

14 years ago

What are the characteristic flame color for sodium, potassium, barium, copper, strontium, and calcium? Explain why? Ans: i know the flame colours, but for the explain why, could the below be a possible answer? The characteristic flame color is due to the...

14 years ago

Distinguish between the view of matter and energy in microscopic world and view matter and energy in the quantum mechanical world. I do not understand this question, i tried googling it, but hardly got something to give me an idea about. Please help.

14 years ago

N2 + O2 = 2NO enthalpy change = +180.6kJ c) what is the enthalpy change for the formation of one mole of nitrogen monoxide? d) What is the enthalpy change for the reaction of 1.000 * 10^2g of nitrogen with sufficient oxygen? I do not understand how to cal...

14 years ago

A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.

14 years ago

From experience, you know that you produce significantly more heat when you are exercising than when you are resting. Scientists can study the heat that is produced by human metabolism reactions using a ‘human calorimeter.’ Based on what you know about ca...

14 years ago

The process of glycolysis is thought to have emerged very early in the origins of life. What evidence to support this theory can you find in the material presented in this section? Be prepared to defend your ideas. Ans: is this question indirectly related...

14 years ago

9. The total amount of energy released from the chemical bonds of glucose is 2870 kJ/mol, after the initial investment of 2 ATP. The total energy that can be harvested to form ATP molecules is about 1200 kJ/mol. a. After the initial investment of 2 ATP, 3...

14 years ago

Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods o...

14 years ago

(a) Calculate [NO2] at each time interval, based on [O2]. Assume initial [NO2] = 0.0 mol/L. how do i calculate NO2 at this time intercal so when t= 600s O2 in mol/l = 0.0021

14 years ago

Write the chemical equation for the complete combustion of each fuel. Then find the enthalpy of combustion, ΔHcomb, of each fuel. Express your answers in kJ/mol and kJ/g. Assume that water vapour, rather than liquid water, is formed in both reactions. CH4...

14 years ago

i did an experiment where we titrated HCl on calcium hydroxide, and now i am confused with the calculations, i do not know if i am correct, so please help me out... Trial One volume of HCl used - 11.20mL concentration of HCl - 0.04mol/L so to get moles of...

14 years ago

How do you use a Lewis Structure to find the oxidation state of an element. I have this question using the oxidation rule i got +2, however how do i use it with Lewis structure. QUESTION Use the Lewis structure of a thiosulfate ion to find the oxidation n...

14 years ago

I have a revision question which i do not understand please help me out: 45. Explain the following observations: motor oil pours from a can more slowly than water; however, in a jar, the meniscus of motor oil is flatter than the meniscus of water. The ans...

14 years ago

is the below the correct electronic configuration for arsenic? Arsenic:[Ar]4s23d104p3

14 years ago

I need help understanding by boron does not follow the ionization trend across the period is lower than the first two elements in the same period, where as it should be higher. has it got to do with the p block having an electron, which makes it easier to...

14 years ago

i need help with the below question, i have tried answering it, but do not know where to go after the equations, please start me off on how to find the enthalpy of combustion of at least one.... Consider methane, CH4, and hydrogen, H2, as possible fuel so...

14 years ago

22. The rate of a chemical reaction is dependent on its ΔH. Do you agree or disagree with this statement? Briefly justify your answer. I agree with the above statement, enthalpy is defined as the internal energy of the reactants and products therefore the...

14 years ago

29. Consider the following chemical equations and their enthalpy changes. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = −8.0 × 102 kJ CaO(s) + H2O(_) → Ca(OH)2(aq) ΔH = −65 kJ What volume of methane, at 20°C and 100 kPa, would have to be combusted in order to r...

14 years ago

31. Carbon monoxide reacts with hydrogen gas to produce a mixture of methane, carbon dioxide, and water. (This mixture is known as substitute natural gas.) 4CO(g) + 8H2(g) → 3CH4(g) + CO2(g) + 2H2O(_) Use the following thermochemical equations to determin...

14 years ago

y(t) = -0.2451 cos 4t + 0.9804 sin 4t + e^(-3t ) (A cos⁡〖t+B〗 sin⁡〖t)〗 y'(t) = ?

13 years ago

A particle moves on the x-axis with an acceleration, 246msta. Find the position and velocity of the particle at 3t, if the particle is at origin and has a velocity of 10ms when 0t by using either the method of undetermined coefficient or Laplace T...

13 years ago

The explosive residue contains carbon, hydrogen and nitrogen where the percentage of nitrogen is high, calculate it from 0.5g of residue which eliminates ammonia gas on reaction with sodium hydroxide, and absorb by 50mL of Nby10 H2SO4. Unused acid is neut...

13 years ago

I am doing my bachelors in forensic science semester two... I would like to know any common topics one may write over 30pages for a research or term paper in regard with forensic science. i tried body language and anti-social behaviour, though this topic...

13 years ago

Please help me what this quotes mean then I have to write WHAT I think about it. i already get eight of them but idont get rest of them. 1) Or I will become engulfed with all I did or I did not do, with what should have been and what cannot be helped 2) Y...

13 years ago

Please help me what this quotes mean then I have to write WHAT I think about it. i already get eight of them but idont get rest of them. 1) Or I will become engulfed with all I did or I did not do, with what should have been and what cannot be helped 2) Y...

13 years ago

HELP Please help me what this quotes mean then I have to write WHAT I think about it. i already get eight of them but idont get rest of them. 1) Or I will become engulfed with all I did or I did not do, with what should have been and what cannot be helped...

13 years ago

Researcher wants to estimate the proportion of Canadians that are over the age of 65, accurate to within 2% using a 95% confidence interval. What is the minimum number of people that should be sampled?

11 years ago

Approximately 5% of children develop chronic bronchitis in the first year of life. In a group of 20 children, find the probability that exactly 2 of them develop chronic bronchitis in the first year of life.

11 years ago

The slender bar AB weights 8 kg and moves in the xy plane, with its ends constrained to follow the smooth horizontal and vertical guides as shown in Figure Qi. By assuming the bar AB is initially at rest; a) Calculate the angular acceleration of the bar....

11 years ago

2. Air enters a converging nozzle at 3.5 m/s at 1.2 kg/m3. The inlet area is 5 cm2. If the outlet area is 1.7 cm2 and velocity of 7.5 m/s, determine the volume flow rate and air density at the nozzle outlet.

10 years ago

An ideal mixing (total volume inlet = total volume outlet) of two incompressible fluids which is between water and methanol (SG =0.85) is coming from two inlets. At inlet 1, water enter at 9 m/s and at inlet 2, methanol enter at 7 m/s. The diameter of inl...

10 years ago

The mean of a normally distributed data set is 12, and the standard deviation is 2. ___% of the data points lies between 8 and 16. Find the percentage

10 years ago

The weights of 1,000 men in a certain town follow a normal distribution with a mean of 150 pounds and a standard deviation of 15 pounds. From the data, we can conclude that the number of men weighing more than 165 pounds is about _____ , and the number of...

10 years ago

Catcher and The Rye To what extent is Holden responsible for his own loneliness?

9 years ago

Explain the difference between Type 1 (T1DM) and Type 2 (T2DM) diabetes. What are the common risk factors associated with T2DM? (Use the abbreviations for Type 1 & 2 diabetes mellitus in your response; don’t forget to define them the first time you use th...

8 years ago

Class 11. Textbook is reflection. Chapter - the gentleman of the jungle. Do you agree with the action of the man at the end . Why ?

8 years ago

Class 11. Textbook is reflection. Chapter is the gentleman of the jungle. Every fable ends with a moral . What moral do you find in this story?

8 years ago

Class 11. Textbook is reflection. Chapter is the gentleman of the jungle. Do you think the story can be read as a political satire on colonialism?

8 years ago

Find the sum to be invested now at 6% compounded monthly so as to accumulate RM8 888 in three years

4 years ago

3.5

14 years ago

Come Again? =S Can You Write the way to the answer please :) THANK YOUUU <3

15 years ago

I Asked My Friend, But Thanks Anyways !!! =)

15 years ago

thank you =)

15 years ago

fg +fps = ma where fg is the force due to gravity fps is the force due to the person on the scale ma is the submission of the forces of Fy re-arrange the formula to find Fps.

15 years ago

you mean y=2x for the first line...because I did something similar however I took the limit, since cos x can not have y values larger than 1 or -1, i took 2cosx=1 i get zero and using both methods:Y-Y1=m(X-X1) and y=mx+b i get y=2x. i checked it using a g...

14 years ago

correct answer! dy/dx = cosx-xsinx.

14 years ago

is 153m the correct answer?

14 years ago

I realized my mistake, i was only finding the resultant for the velocity, not the momentum together, if i do not convert km/h into m/s i get the momentum as 1.24*10^5 is that correct?

14 years ago

I tried solving this by separating the components into the vertical and horizontal, before and after collision. but i only obtain velocity and the deg, however the questions asks for the distance...

14 years ago

Thank you, helped, the equations do balance out, and there are more than one ways to solve this either by multiplying the first equation by 2 and then manipulating further as well as just canceling out and adding all by hess's law.

14 years ago

i tried using it for CH4, below is my working am i correct? cause i researched a website(cannot post link) and it uses enthalpy of formation!!! i am using the molar enthalpy of formation equation: (ndeltaHf products) - (ndeltaHf reactants) CH4 + 2O2 ↔ 2H2...

14 years ago

missing information, * length AB = 0.8m

11 years ago

x-96=29

10 years ago

1.35

7 years ago

Differentiate between the term in the following pairs

5 years ago

co-dominance

5 years ago

I would like to see the work please

4 years ago

1447.5

4 years ago