Friday
December 9, 2016

# Posts by shaila

Total # Posts: 122

Math
Draw a picture that represents 3*50=150
March 29, 2016

math
how many digits r there in 8 tens + 13 ones
September 19, 2014

riddle
Did you hear about . . . the words are something like away five ten music were who tigers a two cash got the store dough etc .
November 22, 2011

November 16, 2010

Physics - work done
A variable force F acts through a displacement d. The magnitude of the force is proportional to the displacement, so F=kd, where k is constant. a) Sketch a graph of this force against position up to position x. b) According to the equation, what is the value of the force at x...
October 6, 2010

Physics - gravitational potential energy
When developing the equation for gravitational potential energy, why is it necessary to assume that the mass is rising at a constant speed?
October 6, 2010

Physics
If the force of friction is constant, prove that the stopping distance of a car on a level road varies directly with the square of the initial speed.
October 6, 2010

Physics - Inelastic
Imagine that you have a very powerful water pistol. Describe in detail the experiment that you could perform, including the measurements that you would make, to determine the velocity of the water as it leaves the pistol.
October 4, 2010

Physics
A car with mass of 1875kg is traveling along a country road when the driver sees a deer dart out onto the road. The driver slams on the brakes manages to stop before hitting the deer. The driver of a second car with 2135kg is driving too close and does not see the deer. When ...
October 4, 2010

Physics - Inelastic Collision ( check + help)
How is it possible that mass which is 0.155kg is not taken into consideration? You solve it as a 2D collision and thereafter you obtain the two equations, two variables and you solve you will get V' Thereafter you find if it is elastic or not by equating the kinetic energy
September 26, 2010

Physics - Inelastic Collision ( check + help)
A billiard ball of mass 0.55kg moves with a velocity of 12.5m/s towards a stationary billiard ball of the identical mass and strikes it with a glancing blow. The first billiard ball moves of at an angle of 29.7deg clockwise from its original direction, with a velocity of 9.56m...
September 26, 2010

Math - Instantaneous and average rates of change
a) Describe a graph for which the average rate of change is equal to instantaneous rate of change for its entire domain. Describe a real life situation that this graph could represent. b) Describe a graph which the average rate of change between two points is equal to the ...
September 26, 2010

Physics - Inelastic Collisions
The speed of a pitched baseball is 46.0m/s. You want to know how fast is your school's star baseball pitcher could throw. You make a pendulum with a rope and a small box lined with a thick layer of soft clay, so that the baseball would stick to the inside of the box. The ...
September 22, 2010

Physics - Inelastic Collisions
The speed of a pitched baseball is 46.0m/s. You want to know how fast is your school's star baseball pitcher could throw. You make a pendulum with a rope and a small box lined with a thick layer of soft clay, so that the baseball would stick to the inside of the box. The ...
September 20, 2010

Math - Intersection of planes
You are given the following two planes: x+4y-3z-12=0 x+6y-2z-22=0 a) Use the two original equations to determine two other equations that have the same solution as the original two. ANS: the original two are not parallel in anyway so can I just take multiples of the original ...
September 20, 2010

Physics - Power Law Data Analysis
Can I make my x value as 3sqrtx, I will get the same straight line? Is that possible, if I use log and the 3sqrtx i get different values of b, which one is more accurate?
September 20, 2010

Physics - Power Law Data Analysis
In an experiment, two variable quantities, x and y were measured. The relation between x and y is thought to be: y= 4(pi)b(x)^3 x(cm) +/- 0.02cm 0.67 0.80 0.90 0.95 y(g) +/- 0.25g 2.25 4.00 5.52 6.60 a) Draw a complete table that allows you to plot the graph which could be ...
September 20, 2010

Math - Rates os change
a) Describe a graph for which the average rate of change is equal to instantaneous rate of change for its entire domain. Describe a real life situation that this graph could represent. b) Describe a graph which the average rate of change between two points is equal to the ...
September 16, 2010

Math - Rates of change using equations
s(t)= -4.9t^2+15t+1 - write an expression to represent the average rate of change over the interval '1' less than or equal to 't' less than or equal to '1+h'
September 16, 2010

Math - Intersection of planes
You are given the following two planes: x+4y-3z-12=0 x+6y-2z-22=0 a) Use the two original equations to determine two other equations that have the same solution as the original two. ANS: the orginal two are not parallel in anyway so can I just take multiples of the original ...
September 15, 2010

Physics: Data Analysis - Power Law
please check and correct a) in the x-axis i will have the sqrt'x' and the y-axis the 'y' variable b) i make a table with the value of sqrt of 'x' and the given y values c) just plot the points but how do i find the constant, i tried it algebraically i ...
September 13, 2010

Physics: Data Analysis - Power Law
In an experiment, two variables quantities 'x' and 'y' were measure. The relation between x and y is thought to be y=ax^(1/2) x(m)+/- 0.01m 0.10 0.20 0.40 0.80 1.00 y(s) +/- 0.05s 0.64 0.90 1.27 1.80 1.90 a) What will you graph in the y- and x- axis in order to...
September 13, 2010

Physics - Data Analaysis - Power Laws
In an experiment, two variables quantities 'x' and 'y' were measure. The relation between x and y is thought to be y=ax^(1/2) x(m)+/- 0.01m y(s) +/- 0.05s 0.10 0.64 0.20 0.90 0.40 1.27 0.80 1.80 1.00 1.90 a) What will you graph in the y- and x- axis in order to...
September 11, 2010

Math - system of equations
write two other equations that have the same solution as this system od equations. 3x-4y=-14 -x+3y=18 I found the solution to the system it is (6,8) there after how do i go about it?
September 7, 2010

Physics - application of Momentum
Could the question be true when the mass is not constant, say maybe in the case of cars. When two cars collide, their masses change but their resultant momentum would be the same before and after the crash so you could you delta p, and the time. Would that be a possible answer?
September 7, 2010

Physics - application of Momentum
Could this be a possible answer for the above question. When catching a ball with bare hands hurts, because it has some force. Since the the ball will always approach one at the same speed, therefore its change in momentum deltaP= Vfinal - Vinitital where Vfinal is zero. Thus ...
September 7, 2010

Physics - application of Momentum
Try to imagine a situation in which the form f=ma would no apply, but the form f=delta p / delta t could be used. Describe that situation. How could you test your prediction.
September 7, 2010

Math - Equations of plane(check)
for the e part of the question you mean: [x,y,z]=[2,3,1]+t[10,2,0]+s[5,1,0] right??
September 6, 2010

Math - Equations of plane(check)
Consider the plane that contains points A(2,3,1), B(-11,1,2), C(-7,-3,-6). a) Find two vectors that are parallel to the plane. Ans: AC, BC or AB will be parallel to the plane. b) Find two vectors that are perpendicular to the plane. Ans: if i find the normal vector then i can...
September 6, 2010

Math - intersection of planes
You are given the following two planes: x+4y-3z-12=0 x+6y-2z-22=0 a) Determine if the planes are parallel b) Fine the line of intersection of the two
September 6, 2010

Math - equation of plane and vectors
If i want to find the x-, y- and z- intercepts do i write a new vector equation because we previously found the intercepts but the x-intercept =16 y-intercept = -4 and the z-intercept = 8 i tried writing a vector equation using the one vector as my point and the scalar ...
September 5, 2010

Math - equation of plane and vectors
A plane is defined by the equations x-4y+2z=16. Find two vectors parallel to the plane.
September 5, 2010

Math - equations of lines
Writing the parametric equations of the given line one x=-21-12t and since we want the x intercept the y=z=0 therefore 8+4t=0 and 14+7t=0 in both case the t value is '-2' repeating the similar procedure to find the y-intercept the value of s=-3 there after how do i ...
September 5, 2010

Math - equations of lines
A line has the same x-intercept as [x,y,z]=[-21,8,14]+t[-12,4,7] and the same y-intercept as [x,y,z]=[6,-8,12]+s[2,-5,4]. Write the parametric equation of the line.
September 5, 2010

Math - vector equation of a parallelogram
Isn't there another way to find the vector equation because they are the correct coordinates sample answers are: [x,y]=[-1,4]+t[1,-1] [x,y]=[-1,4]+t[2,1]
September 5, 2010

Math - vector equation of a parallelogram
The vertices of a parallelogram are the origin and the points A(-1,4), B(3,6), and C(7,2). Write the vector equations of the lines that make up the sides of the parallelogram
September 5, 2010

Math - intersection of planes
You are given the following two planes: x+4y-3z-12=0 x+6y-2z-22=0 a) Determine if the planes are parallel b) Fine the line of intersection of the two planes. c) Use the two original equations to determine two other equations that have the same solution as the original two. d) ...
September 4, 2010

Math - Equations of plane(check)
Consider the plane that contains points A(2,3,1), B(-11,1,2), C(-7,-3,-6). a) Find two vectors that are parallel to the plane. Ans: AC, BC or AB will be parallel to the plane. b) Find two vectors that are perpendicular to the plane. Ans: if i find the normal vector then i can ...
September 4, 2010

Math - equation of plane and vectors
A plane is defined by the equations x-4y+2z=16. Find two vectors parallel to the plane.
September 4, 2010

Math - equations of lines
A line has the same x-intercept as [x,y,z]=[-21,8,14]+t[-12,4,7] and the same y-intercept as [x,y,z]=[6,-8,12]+s[2,-5,4]. Write the parametric equation of the line.
September 4, 2010

Math - vector equation of a parallelogram
The vertices of a parallelogram are the origin and the points A(-1,4), B(3,6), and C(7,2). Write the vector equations of the lines that make up the sides of the parallelogram
September 4, 2010

Physics - elastic collision
Since the directions are north and west you directly use the Pythagoras theorem to find the resultant speed?? and the tan of the two two get the angle??
September 4, 2010

Physics - elastic collision
Car A, with mass of 1735kg, was traveling north at 45.5km/h and car B, with a mass of 2540kg, was traveling west at 37.7km/h when they collided at an intersection. if the cars stuck together after the collision, what was their combined momentum? Was the collision elastic or ...
September 4, 2010

Physics - Elastic Collision
how is this equation derived V'2= V1(2M1)/(M1+M2) (elastic collision - where one object is moving and the other is stationary)
September 4, 2010

Physics - Momentum of cars at intersection
Car A(1750kg) traveling due south and car B (1450kg)due east. They reach the same intersection at the same time and collide. The cars lock together and move off at 35.8km/h[E31.6degS]. What was the velocity of each car before the collided? I tried this question using the law ...
September 1, 2010

Physics - Momentum of cars at intersection
Two cars of identical mass are approaching the same intersection, one from the south and the one from the west. They reach the intersection at the same time and collide. The cars lock together and move away at an angle of 22deg counterclockwise from the road; heading east. ...
September 1, 2010

Physics - Momentum
Under what circumstances is the change in momentum of a system equal to zero?
September 1, 2010

Math- intersection of planes
Show that the line [x,y,z]=[10,5,16]+t[3,1,5] is contained in the plane x+2y-z-4=0 I tries writing the vector equation in parametric form and then substituting it into the respective x,y,z in the plane, after simplifying I get 0t=0 does this mean that the line is in the plane ...
September 1, 2010

Math - Intersection of planes
Find the vector equation of the line of intersection for the pair of planes. Plane one: x+5y-3z-8=0 Plane two: y+2z-4=0 I did half of the work but now i am stuck. the normal of the planes are not parallel and therefore a solution exists, you simultaneously solve the equations...
September 1, 2010

Physics - Rube Goldberg Project
I need to make a Rube Goldberg Machine and it must demonstrate projectile motion, conservation of energy and conservation momentum, any idea on what to make and how to make it? Help please
August 31, 2010

Math - distances between two planes
Find the distances between planes. plane 1: 2x-y-z-1=0 plane 2: 2x-y-z-4=0
August 28, 2010

Math - distance b etween a line and plane
Find the distance between the parallel line and the plane. line: vector r = [2,0,1]+t[1,4,1] plane: 2x-y+2z=4
August 28, 2010

Math- Intesection of a plane and line
Does the line [x,y,z]=[5,-9,3]+k[1,-12,2] intersect the plane [x,y,z]=[4,-15,8]+s[1,-3,1]+t[2,3,1]? If so, how many solutions are there? ( I tried finding the normal vector, there after finding the "d" value to write in scalar equation, and once it is in scalar ...
August 28, 2010

Math - number of solution
Determine the number of solutions for the system without solving. 3x+12y=-27 4x+2y=34
August 28, 2010

Math - interection of two lines
Determine if L1 [x,y,z]=[4,-3,2]+t[1,8,-3] and L2 [x,y,z]=[2,-19,8]+s[4,-5,-9] intersect
August 28, 2010

Math - Solving Linear systems
Solve the linear system in two space [x,y] = [-12,-7] + s[8,-5] [x,y] = [2,-1] + t[3,-2]
August 28, 2010

Math - Equations of planes
Write a vector equation and scalar equation of the plane containing lines [x,y,z]= [-2,3,12]+s[-2,1,5] [x,y,z]= [1,-4,4]+t[-6,3,15]
August 27, 2010

Physics - Applications of Momentum
Use the concept of impulse to explain the difference in the results of a jump using a proper bungee cord and a jump using ordinary rope. (Ans: Is it that impulse is equal to mVf - mVi and the final velocity will be zero for the ordinary rope, however when using the bungee cord...
August 25, 2010

Physics - Momentum
Try to imagine a situation in which the form f=ma would no apply, but the form f=delta p / delta t could be used. Describe that situation. How could you test your prediction.
August 25, 2010

Physics - Momentum
Define momentum qualitatively and quanititatively. (qualitatively - a measure of an object's mass to resist changes in its velocity or acceleration. Is this correct? How do I define momentum quantitatively)
August 25, 2010

Maths - Properties of Planes
Wrtie a scalar equation given it's parametric equation. x = 3-2s+2t y = 1+3s+t z = 5-s-2t
August 24, 2010

Maths - Properties of Planes
write a scalar equation, given it's vector equation. [x,y,z]= [3,7,-5] + s[1,2,-1] + t[5,-2,3] ( I remember my teacher saying that you have to cross s and t, and that will be my normal and thereafter I substitue the point to find the 'D' value of the scalar ...
August 24, 2010

Physics - Satellite Motion
Calculate the acceleration of two different satellites that orbit Earth. one is located at 2.0Earth radii and the other located 4.0Earth radii.
August 24, 2010

Physics - Forces
A 42kg girl jumps on a trampoline, after stretching to its bottom limit; the trampoline exerts an average upward force on the girl over a diplacement of 0.50m. During the time that the trampoline is pushing her up, se experiences an average acceleration of 65.0m/s^2. Her ...
August 24, 2010

physics - uniform circular motion
Explain why the kinematics equations which describe the motion of the object that has constant acceleration cannot be applied to uniform circular motion.
August 23, 2010

physics - newtons 3rd law
According to Newton's third law, for every action force there is a reacgtion force, then how can a team win a tug of war contest
August 23, 2010

Physics - frames of reference
A car turns off the highway onto a curved exit ramp. a) What type of motion does the passangers' fram of reference experience relative to the ground? b) Explain why the passangers feel a force to the right as the car turns. c) How would an observer on an overpass describe ...
August 23, 2010

Physcis - Planets
How could you discover a planet without seeing it with a telescope?
August 23, 2010

Physics - Geostationary Satellite
Why must a geostationary satellite orbit over the equator?
August 23, 2010

Physics - Planetary Motion
The planet Neptune has an orbital radiu around the sun of about 4.50 * 10^12m. What are its period and its orbital speed?
August 23, 2010

Physics - Satellite Motion
The polar- orbiting environmental satellites (POES) and some military satellites orbit at a much lower level in order to obtain more detailed information. POES complete an Earth orbit 14.1 times per day. What are the orbital speed and the ltitude of the POES?
August 23, 2010

Physics - weighing a planet
Explain how you can weigh a planet? ( Is it by the combination of the netwons law of univeral gravitation and keplers third law; t^2/r^3 = 4(pi)^2/G(Msun) )
August 22, 2010

Physics - Newton's Law of universal gravitation
Describe how Newton used each of the following phenomena to support the law of universal gravitation a) the orbit of the moon b) kepler's third law
August 22, 2010

Physics - Cavendish experiment
Describe the objective, apparatus and results of the Cavendish experiment
August 22, 2010

Physics - Gravitational force
Find the gravitational force between earth and the sun. I am using the formula Fg = (G*m1*m2)/(r^2) where G = 6.67*10^-11 m1 = 6.0*10^24kg m2 = 2.0*10^30kg r = should i use the sun's radius or the earths (Rearth = 6.38*10^6; Rsun = 6.96*10^8) either way i use i am not ...
August 21, 2010

Physics - banked curves
Sharp turns are banked more steeply because when turning the vertical component does not matter, however it is the horizontal component should be balanced otherwise the car skids on in the horizontal direction??
August 21, 2010

Physics - banked curves
On a highway, why are sharp turns banked more steeply than gentle turns?
August 21, 2010

Physics - Centrifugal force
A centrifugal force, if it existed, would be directed raidally outward from the centre of the circle during a circular motion. Explain why it feels as though you are being thrown outward when you are riding on an amusment park ride that causes you to spin in a circle.
August 21, 2010

Physics - Uniform circular motion
If you were swingin a ball on a string around in a circle in a vertical plane, at what point in the path would the string be the most likelt to break? Explain why In what direction would the ball fly when the string broke?
August 21, 2010

Physics - Uniform circular motion
What type of acceleration is associated with uniform circular motion?
August 21, 2010

Physics - maximum height of the projectile motion
Suppose you knew the maximum height reached by a proejctile. Could you find its launch angle from this information alone? If not, what additional information would be required? (No it is not enough, the initial velocity? i also think yes because the highest the angle can be is...
August 21, 2010

Physics - Range of projectile motion
What properties of projectile motion must you apply when deriving an equation for the range of a projectile? (is it the trignometric identity??)
August 21, 2010

Physics - rojectile Motion (check pls)
It is a communication worth question so i have to be wordy! btw - i got the answer of the projectile motion of the baseball! I was using sine of the angle multiplied by time instead of cosine in the horizontal component Thank you!
August 21, 2010

Physics - rojectile Motion (check pls)
Imagine that you are solving a problem in projectile motion in which you are asked to find the time at which a projectile reaches a certain vertical position. when you solve the problem you find out two different positive values for time that both satisfy the condition of the ...
August 21, 2010

English - Thesis Statement on Life of Pi
a) how is life of pi a story within a story within story? ( i know the first part a story within a story, but the other within the story, i am confused) b) i am going to write an essay about story telling on Life of Pi by Yann Martel and so far have ideas such as the type of ...
August 21, 2010

English - Book Choice
Can anyone suggest names of books which include friendship between two women, or a book written by an American African.
August 21, 2010

Physics - Projectile Motion
During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42deg above the horizontal, giving it an initial velocity of 15m/s. If the ball is 5.3m above the level of the playing field when you throw ...
August 19, 2010

Physics - Projectile Motion
While Hiking in the wilderness, you come to the top of a cliff that is 60.0m high. you throw a stone from the cliff, giving it an initial velocity of 21m/s at 35deg above the horizontal. How far from the base of the cliff does the stone land? (85m) I tried this question but i ...
August 19, 2010

English - Life of Pi and religion
What is the role of christainity in Life of Pi?
August 16, 2010

English - Life of Pi suggestions
I need to write an essay for life of pi which is five to six pages long, could anyone please give me suggestions what to write about, I find the practice of religion interesting as well as the sorry telling vs the reality but i do not know how to formulate a thesis and to use ...
August 16, 2010

English - book suggestions
Book suggestions to read with Sula by Toni Morrison, i have to read a second book realted to the above book either in themes or in criticism. Can anyone give me a list of a couple of books i could choose from?
August 16, 2010

Physics - Inclined Motions
You are pushing a 53kg crate at a constant velocity up a ramp onto a truck. The ramp makes an angle of 22deg with the horizontal. If your applied force is 373N, what is then coefficient of friction between the crate and the ramp?
August 11, 2010

Physics - Modern Society
By the mid-1800s, steam driven elevators with counterweights had been developed. However, they were not in common use until 1852, when Elisha Otis invented an elevator from falling if the cable broke. How do you think that the invention of a safe elevator changed the modern ...
August 11, 2010

Physics
Two objects are moving in different direction. Under what circumstances can you treat this as one-dimensional problem?
August 11, 2010

Physics - gravitational acceleration
How does and Atwood machine make it easier to determine g - the acceleration due to gravity, rather than by just measuring the acceleration of a free-falling object?
August 11, 2010

Physics - Vertical Motion
A 64kg person is standing on a scale in an elevator. the elevator is rising at a constant velocity but then begins to slow, with an acceleration of 0.59m/s^2. What is the sign of the acceleration? What is the reading on the scale while the elevator is accelerating.
August 11, 2010

Math - Vectors
Resolve vector u =[3,4,7] into rectangular components, on which is collinear with vector v =[1,2,3].
August 10, 2010

Math - Vectors
Prove that vector i,j and k are mutually orthogonal using the dot product. What is actually meant by mutually orthogonal?
August 10, 2010

Calculus - Dot Product
A crate is dragged 3m along a smooth level floor by a 30n force applied at 25deg to the floor. Then it is pulled 4m up a ramp inclined at 20deg to the horizontal, using the same force. Then, the crate is dragged a further 5m along a level platform using the same force. ...
August 9, 2010

vectors in three space
a) Describe the form of the coordinates of all points that are equidistant from the x- and y-axes. b) Describe the form of the coordinated of ll points that are equidistant from the x-, y- and z-axes.
August 9, 2010

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