Homework Statement
http://imgur.com/a/L82gU
[Mod note: Inserted image inline for convenience]
Homework Equations
KVL, KCL
The Attempt at a Solution
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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...
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...
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...
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...
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...