Homework Statement
I need to find the total impedance in a circuit that has:
j60 ohms, 30 ohms, -j60 ohms and 20 ohms in parallel
Homework Equations
Ztotal=1/(Z1+ Z2+ Zn)
The Attempt at a Solution
I've tried doing this, but what I think is the -j60 and the j60 should cancel...
So I've made a circuit that lights up a light bulb whenever it's dark. I did this using a photoresistor and it is working. However, I have a relay switch with a 9V battery and a 7.2V lightbulb. When it was supposed to turn on, it lasted a couple of minutes and the battery is now dead. Should I...
Homework Statement
Design a rectifier with a zener diode that satisfies the following:
Primary voltage = 120V @ 60Hz
VDC = 12V
IR2 = 100 mA (R2 being the load)
Vr(R2) <= .3V
Homework Equations
C=IDC/(2fVr)
IDC=IR3 + IR1
The Attempt at a Solution
I tried calculating the...
Homework Statement
Suppose we rotate a grapefruit and a metal ring
on a dining table with a smooth surface. Grapefruit has a volume of
575 cm3 and density of 0.4 g/cm3, while the ring has mass of 57 g,
length of 2 cm and area of 38.5 cm2. Determine
A. Moment of inertia of each of the...
Homework Statement
The bar AB is rotating with an angular velocity w=10rad/s. Determine the velocity of the piston C at the instant θ = 45. Provide the vector solution and the solution with the instantaneous center of zero velocity
Homework Equations
Vb = Va + w x r(b/a)
Vc = Vb + w x...
ok, so what I have is the astronaut can continue for 9.4395 seconds, the angular velocity of the astronaut is 4.0118 rad/s^2, the normal acceleration would be 3.6125t^2 and tangencial acceleration is 8.5 rad/s^2. Does that seem about right?
Thank you!
Ok, I think I got it, sqrt(72.25 + 13.05t^4) has to equal 10g(98.1). I tried to find the value of t and got 5.201s, isn't that too small for this exercise?