ceasar

A student of mass 80kg stands on a spring scale in an elevator.During the first 3seconds,starting from rest,the scale reads 80kg.Determine the velocity of the elevator at the end of the 3seconds,and the tension T in the supporting cable during the acceler...

14 years ago

calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction: P4(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)

14 years ago

Given that A + B = 120 degrees and cosA + cos B = 1 divided by squareroot of 2,show that cos A-B divided by 2 = 1 divided by square root of 2

14 years ago

evaluate without using a calculator, leaving your answer as surds (a)sin105 degrees (b)tan15 degrees (c)cos 75 degrees

14 years ago

calculate the refractive index for a ray travelling from air to water given that the angle of incidence is 30degrees and the angle of refraction in the water is 22 degrees.Determine the speed of the ray in water.

13 years ago

Three points A,B and C have coordinates (1,0),(4,4) and (13,5) respectively. 1.By how many units does the length of AC exceed the length of AB 2.What is the slope of BC

13 years ago

Given that the equation of the hyperbola is 9x(squared)-4y(squared)=36. (i)Find the centre and vertices (ii)Find the foci and eccentricity (iii)find the equation of the asymptotes

13 years ago

How much ice at zero degrees celsius is needed to cool 250g of water at 25 degrees celsius to zero degrees celsius.

13 years ago

A stone is thrown vertically upwards with a speed of 24m/s,two seconds later a second stone is dropped from the same point.Find where the two stones meet

13 years ago

A bomb is dropped from a height of 40m.simultaneously and vertically below it,a second bomb is fired vertically with a velocity of 20m/s.At what distance from the ground do they collide

13 years ago

given that (2 +3i)(3-4i)=x+yi,find x and y

13 years ago

Given A = (X-2 1 ) 2 X-3 is a singular matrix,find the value of x

13 years ago

Use binomial theorem to to expand squareroot of 4+x in ascending powers of x to four terms.Give the limits for which the expansion is valid

13 years ago

Show weher the equation is exact and find its primitive (3e^3x y - 2x)dx + e^3x dy=0

10 years ago