Recent content by africanmasks

Homework Statement If you make the change of variables: x= ucos(\theta)-vsin(\theta) y= usin(\theta)+vcos(\theta) where the angle 0 \leq \theta <\pi/2 is chosen in order to eliminate the cross product term in: 4x2+8xy+6y2=30 What is the angle you would use? Homework Equations...

Homework Statement Suppose we have the following program segments: int *zPtr; int *aPtr = NULL; void *sPtr = NULL; int number,i; int z[5] = {1,2,3,4,5}; sPtr = z; point out the error of the following code: (a) ++zPtr; (b) number = zPtr; (c) number =...

Homework Statement Suppose your mass is 76.0 kg and you climb 40 stairs of height 18 cm in 19.0 s. What is your power output as you climb the stairs? Homework Equations Power = Work / change of time The Attempt at a Solution I need a hint on solving for the work. I tried solving for the...

Thanks. I got it.

Homework Statement A sky diver of mass 79.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 53.0 m/s. (a) What is the acceleration of the sky diver when her speed is 30.0 m/s? What is the drag force on the diver when her speed is the following? (b) 53.0 m/s (answer in...

Homework Statement A cylindrical tank, with base radius 9.4 meter, lies on its side and is partially filled with a liquid whose density is \sigma=1260 kilograms per cubic meter. The liquid fills the tank to a maximum depth of 14 meters. Determine the amount of force (in Newtons) exerted on a...

Thanks.

Homework Statement Find the integral of: 1 /( cos(u)^(2) sin(u) ) Homework Equations The problem says to make the 1 in the numerator= sin(u)^(2)+cos(u)^(2)The Attempt at a Solution sin(u)^(2)+cos(u)^(2) / ( cos(u)^(2) sin(u) ) (What should I do first?)

you're rotating around the y not x

Homework Statement Find the volume of the solid formed by rotating the region enclosed by the following equations about the Y-AXIS. y= e^(3x)+5 y=0 x=0 x= 1/2 Homework Equations The Attempt at a Solution I keep getting the answer wrong. I broke the problem into two parts: solved a...

Homework Statement As their booster rockets separate, Space Shuttle astronauts typically feel accelerations up to 3g, where g = 9.80 m/s2. In their training, astronauts ride in a device where they experience such an acceleration as a centripetal acceleration. Specifically, the astronaut is...