Recent content by nothingsus

Homework Statement http://imgur.com/a/L82gU [Mod note: Inserted image inline for convenience] Homework Equations KVL, KCL The Attempt at a Solution [/B] one of my equations will be at one of the nodes and will include all 3 currents. i can also draw two loops, one for the upper triangle...

Oops. Nice spot. Thanks for the help!

Homework Statement A stone is dropped in a well. The splash is heard 3s later. What is the depth of the well? Homework Equations constant acceleration equations take speed of sound to be 343 m/s. The Attempt at a Solution For the stone: u = 0 a = g s = ut + 0.5at^2 subbing it all in you get...

Dang, can't believe I missed that. Thanks for the reply!

Homework Statement ignore all the other writing! The Attempt at a Solution I can't tell where I'm making a mistake. Probably a massive oversight somewhere but I don't know where! First find the reaction forces at the pin and roller by treating everything as a rigid body. (I am now aware...

Homework Statement Homework Equations tau = r x F varignons theorem The Attempt at a Solution I drew the diagram and the moment arm method and the component of the force perpendicular to vector OA seemed hard to find, so I used varignons theorem. tau = -abs(5000*5)+abs(6000*-4) = -16000...

Homework Statement A constant force F of magnitude 82.0 N is applied to a 3.00 kg shoe box at angle phi = 53.0°, causing the box to move up a frictionless ramp at constant speed. How much work is done on the box by when the box has moved through vertical distance h = 0.150 m? Homework...

F_g is straight down (x component is still down the hill) and displacement is up the ramp? So the angle isn't 0 degrees anymore?

Homework Statement Homework Equations W_g = mgdcos(phi) The Attempt at a Solution So the angle between the force doing work (x component of F_g) and the displacement (down the hill) is 0 degrees. aka phi is 0 degrees. This is true for (a), (b) and (c). so since cos(0) = 1, the work done by...

Homework Statement An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1100 N. The coefficient of static friction between the box and the floor is 0.35. (a) What should be the angle between the cable and the horizontal in...

With your help I was able to solve it! I'll try to think further ahead for future problems. Thanks so much!

Homework Statement The current world-record motorcycle jump is 77.0 m, set by Jason Renie. Assume that he left the take-off ramp at 12.0º to the horizontal and that the take-off and landing heights are the same. Neglecting air drag, determine his take-off speed Homework Equations R =...

Homework Statement From an alien spaceship Earth is in the direction (1, -8, -4) and Venus is in the direction (3, 12, 4). The average alien eye has a field of view of 5pi/6 radians. Without using arccos or calculating any exact angles, determine if the average one eyed alien on the spaceship...

Homework Statement Find the domain of 1/(sqrt(2x)-1)2 Note: the minus one is not included under the square root Homework Equations Title The Attempt at a Solution So the denominator cannot be zero so that means that sqrt(2x) cannot equal 1 x cannot be 1/2 letting the...

Homework Statement In the circuit shown, find the current in the 20-ohm resistor and the potential difference between points X and Y. Homework Equations The Attempt at a Solution I've never really ran into a problem where the battery is in the parallel branches with resistors...