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  find the cosines of the interior angles of the triangle with vertices A(3,-1,1), B(4,1,0),C(2,-3,0), find the vector component of AC orthogonal to AB.

  Posted by benjamin7 on Nov 21, 2009 at 12:35 PM

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  a) Find the gradient of the function  y=9x-x^3 at the point where x=-3.

  Posted by ferny on Nov 20, 2009 at 04:32 PM

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  Box is being pulled up a rough incline by a rope connected to a pulley as in the following figure.Which of the following forces are doing work on box

  Posted by shawn123 on Nov 20, 2009 at 05:33 AM

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  Which of the following units are to measure energy or work?

  Posted by jayjay00 on Nov 20, 2009 at 05:29 AM

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  A 46kg pole vaulter running at 11m/s vaults over the bar. Her speed when she is above the bar is 1m/s. The acceleration of gravity is 9.8m/s^2.

  Posted by won on Nov 20, 2009 at 05:27 AM

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  A 1.98 kg ball is attached to a ceiling by a 2.1 m long string. The height of the room is 5.95 m. The acceleration of gravity is 9.8 m/s^2.

  Posted by jayy000 on Nov 20, 2009 at 05:21 AM

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  A pair of sunglasses has lenses made of a material that darkens when exposed to daylight.

  Posted by lee100 on Nov 19, 2009 at 10:47 PM

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  Consider the collision of two identical parti-cles, with m1 = m2 = 10 g.The initial velocity of particle 1 is v1 and

  Posted by paperheart on Nov 19, 2009 at 07:38 PM

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  Calculate the determinant of this 6 x 6 matrix.

  Posted by benjamin7 on Nov 19, 2009 at 02:58 PM

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  If y=7.5 when x=0.5, find y when x=-3

  Posted by talleighchris on Nov 19, 2009 at 02:36 PM

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  Pre-Calc story problem(forces)

  Posted by lindsey0 on Nov 19, 2009 at 02:22 PM

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  Two 3.4g bullets are fired with speeds of 42.9 m/s and 77 m/s, respectively.

  Posted by jharry23 on Nov 19, 2009 at 06:21 AM

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  A 46 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1 m/s. The acceleration of gravity is 9.8m/s^2.

  Posted by lala2pretty on Nov 19, 2009 at 06:17 AM

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  A bead slides without friction around a loop the loop.The bead releases from height of 12.3m from the bottom of the loop the loop which has radius 3m

  Posted by juniormax on Nov 19, 2009 at 06:09 AM

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  ((3 cos pi)-(4 sin pi))^2+((4 cos pi)+(3 sin pi))^2=2

  Posted by adeleon35 on Nov 19, 2009 at 05:34 AM

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  Two forces acting on an object produce the maximum net force if they are acting at an angle of:

  Posted by harris123 on Nov 19, 2009 at 05:24 AM

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  Two forces acting on an object produce the minimum net force if they are acting at an angle of:

  Posted by hrrjack on Nov 19, 2009 at 05:19 AM

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  A 10 kg chandelier lamp is hanged by a 2m rope from a 6m height ceiling at the national museum of Art in Cracovia.

  Posted by lala25 on Nov 19, 2009 at 05:17 AM

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  You push your lawnmower(mass=15kg)across the lawn at constant speed.To do so,you exert 120N of force. The handle makes a 45degree angle horizontal.

  Posted by shawn123 on Nov 19, 2009 at 05:09 AM

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  Work on an incline plane A 6.0 kg block is pushed 8.0 m up a rough 37 degrees inclined plane by a horizontal force of 75 N.

  Posted by jayjay00 on Nov 19, 2009 at 05:04 AM

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  Mass m traveling with a velocity v to theright and mass M traveling to the left with avelocity 2 v to the left collide head-on.

  Posted by ispyy on Nov 18, 2009 at 11:39 PM

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  A car with mass 1155 kg, moving at 32 m/s,strikes a(n) 2553 kg car at rest.If the two cars stick together, with whatspeed do they move? answer in m/s.

  Posted by papertee on Nov 18, 2009 at 10:55 PM

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  Math problem about hours worked and wages earned.

  Posted by fray on Nov 18, 2009 at 10:32 PM

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  A.) If the diver leaves the board with an initial upward speed of 2.90 m/s, find the diver's speed when striking the water. Answer in units of m/s.

  Posted by lala2pretty on Nov 18, 2009 at 05:27 AM

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  An aspiring artist has decided to design her own wine glass using a graphing package on her computer.

  Posted by socceroos on Nov 18, 2009 at 01:47 AM

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  Find the n^th term and the 5^th term in the geometric sequence where (a)(i) a = 3 , r = 5 (ii) {1.21, -1.331, 1.4641...}    

  Posted by crackers on Nov 18, 2009 at 01:19 AM

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  Sketch a possible function for this gradient function.

  Posted by dowlern on Nov 18, 2009 at 12:54 AM

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  The following graph represents the cross-sectional view of a mountain.

  Posted by fantakerr on Nov 18, 2009 at 12:49 AM

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  A colony of organisms is increasing at a rate according to the rule N(t) = 3 + 4, where N is the number of organisms at any time t hours.

  Posted by wgema on Nov 18, 2009 at 12:43 AM

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  The two graphs below represent the distance, s, metres, an object travelled in time t seconds.

  Posted by apple102 on Nov 18, 2009 at 12:40 AM

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  The graph below  shows  the horizontal displacement of a pendulum from its rest position over time.

  Posted by taylormine on Nov 18, 2009 at 12:31 AM

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  The following graph shows the average monthly rainfall in millimetres for Toowoomba in 2007 and 2008.

  Posted by boop714 on Nov 18, 2009 at 12:15 AM

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  What are the thirteen books of Euclid?  

  Posted by ihhhj on Nov 17, 2009 at 07:33 PM

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  when SIN (2x) + (SIN x)^2 = 0, how can I find x between 0 and 2pi? 

  Posted by wilcop on Nov 17, 2009 at 10:33 AM

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  when 3 (tan x)^2 + 4 (sin x)^2 = 0, what is x between 0 and 2pi? 

  Posted by jamesbad on Nov 17, 2009 at 07:52 AM

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  If 2*cosx*cos(3x)+1=0, what can x be between 0 and 2pi?

  Posted by tanjag on Nov 17, 2009 at 04:51 AM

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  If cos x * (cos 4x) = sin x * sin (6x), what is x between 0 and 2pi?

  Posted by kaaskop on Nov 17, 2009 at 03:30 AM

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  Proof that sin a + sin b= 2sin [(a+b)/2]cos [(a-b)/2]

  Posted by upvictory on Nov 17, 2009 at 02:05 AM

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  FACTORISATION AND QUADRATIC EQUATION

  Posted by stsf on Nov 17, 2009 at 01:33 AM

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  If cos x + cos (3x) + cos (5x) = 0, what can x be between 0 and 2pi?

  Posted by fcstrooper on Nov 16, 2009 at 11:55 PM

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  A boat travels 12 km upstream & back in 1 hour 45 minutes. If the speed of the current is 3 km/h throughout, find the speed of the boat in still..

  Posted by arman7763 on Nov 16, 2009 at 09:49 PM

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  In 2005, the members of a club paid a total of $42 in subscription fees. In 2006, the number of members increased by 20 & the subscription fees..

  Posted by mahmuda092569 on Nov 16, 2009 at 08:11 PM

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  (a) What is the amplitude and period of the function graphed on the right? (see my profile picture for graph)  

  Posted by apple102 on Nov 16, 2009 at 08:02 PM

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  Sketch the graph of y = 3sin (2x) in the domain -2pi less than or equal to x less than or equal to 2pi. Show all working to find the main points on

  Posted by fantakerr on Nov 16, 2009 at 06:41 PM

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  The monthly temperature in a city in the northern hemisphere can be modelled by the function T=6.7sin pi x t/6 +11.1,

  Posted by wgema on Nov 16, 2009 at 06:28 PM

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  x+(5x+3)=2-(7x-2x)

  Posted by disa95 on Nov 16, 2009 at 01:25 PM

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  Given: cos x + cos (3x) + cos (5x). what is x?

  Posted by kooskuin on Nov 16, 2009 at 01:22 PM

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  Given is sin (2x) + (sin x)^2= 0, what is x?

  Posted by henkien on Nov 16, 2009 at 12:53 PM

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  x+(5x+3)=3-(7x-2x)

  Posted by disa95 on Nov 16, 2009 at 12:50 PM

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  Given is (1 - sin x) * tan x = sin x     find all values for x between 0 and 2π

  Posted by tooliebol on Nov 16, 2009 at 11:04 AM