Homework Statement
The capacitor is changed so that the largest possible current is supplied by the source.
Enter the value of the capacitive reactance when this change is made.
Give your answer in Ohms (Ω). A unit is not required with your answer.
Homework Equations
The circuit is powered by...
Homework Statement
When the defibrillation shock is applied, the capacitor discharges through the patient as shown in the diagram below:
The fraction of charge remaining on the capacitor 1.00 ms after it begins discharging is 0.300.
Calculate the resistance of the patient. Note: This will...
Homework Statement
Defibrillation[/B] is a common treatment for life-threatening cardiac arrhythmias and ventricular fibrillation. The defibrillator applies a current across the heart (shown by the red arrows in the image below) for a short time (a few milliseconds), disrupting the arrhythmia...
Homework Statement
Calculate the net charge on a magnesium ion which has lost two electrons.
2. The attempt at a solution
I put 2+ as my answer and this is what I was told, but I don't understand what they mean by the following;
That's a chemist's shorthand, not the amount of charge on the...
All I've been given for this question is what I gave you.
di is the distance the image is seen from the mirror. The camera is held by the said person taking the picture. I assume distance from the mirror to focus???
Homework Statement
You look at yourself in a shiny Christmas tree ball, which has a diameter of 9.63 cm. If your face is 7.81 cm away from the shiny ball, calculate the image distance.
Homework Equations
???
Thinking I would use
magnification = di/d0
di = 0.0781m
d0 = 0.0963m
The Attempt at...
Homework Statement
Suppose that you want to take a mirror selfie, standing 3.05 m in front of a plane mirror.
Calculate the distance that the camera will focus to, to get a clearly focused image of your beautiful self.
Homework Equations
d0 = di
The Attempt at a Solution
Would I be correct...
Yes, it's half the time because we are only want the time to get to the sea bed, whereas we were given the time to reach the seabed and come back to the boat.
Homework Statement
A depth sounder on a ship measures the distance between the bottom of the ship and the seabed using a high-frequency pulse of sound (sonar stands for SOund Navigation And Ranging). Sound travels through water at 1.48 km/s.
Calculate the distance to the seabed if the...
Homework Statement
A radio transmitter is located 17.5 km away. The broadcast signals travel at the speed of light (c = 3.00 x 108 m.s-1) through the air towards a radio receiver.
Calculate the time it takes the radio signal to travel from the transmitter to the receiver.
Homework Equations...
Sorry again, found that there was a question about calculating how long it will take this sheep to develop hypothermia if left outside on this cold day. With the final answer in hours. Same numbers given as shown above at the start of my original forum.
I have attempted the question, and told...
Hi :), thank you for your help. No there is not a second question relating to how long it takes for the sheep to develop hypothermia.
Also, with the change in temp (delta T) which of the following calculations would be correct???
delta T = -10 + 39 = 29 C
or
delta T = 39 + 10 = 49 C
???
Homework Statement
A careless farmer sends this sheep out to graze on a very cold winter day when the temperature is -10oC. The sheep's coat has a thickness of 4.7 cm and a surface area 1.3 m2.
Calculate the rate of heat loss from the sheep on this cold day. Assume that heat is lost only...
Homework Statement
How to rearrange following equation?
Homework Equations
f = (1/2pi) square root of (k/m)
The Attempt at a Solution
(f^2 x m)/ (1/2pi)^2
Is this how i would do it?
Homework Statement
Calculate the speed of the block in SHM as it moves through equilibrium position.
k= 45.08248265 N/m
m of block = 0.505kg
T = 0.665s
Homework Equations
w= the square root of (k/m) ???
The Attempt at a Solution
w = the square root of (45.08248265/0.505)
= 9.448398958
=...