A cardiac defibrillator stores 1275 J of energy when it is charged to 5.6kV What is the capacitance? O 11.3 pF 96.1 pF O 813 F
1 answer:
Answer:
Explanation:
The answer is not among the given options. However, this is a good example of the relation between the energy stored in a capacitor and its capacitance
, which is given by the following equation:
(1)
Where:
is the voltage
is the capacitance in Farads, the value we want to find
Isolating from (1):
(2)
(3)
Finally:
This is the capacitance of the cardiac defibrillator
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Answer:
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.
Explanation:
From Physics we get that expansion of the rod portion is found by this formula:
(Eq. 1)
Where:
- Expansion of the rod portion, measured in meters.
- Linear coefficient of expansion for titanium, measured in
.
- Initial length of the rod portion, measured in meters.
- Initial temperature of the rod portion, measured in Celsius.
- Final temperature of the rod portion, measured in Celsius.
If we know that ,
,
and
, the expansion experimented by the rod portion is:
The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.
Hello!
Everything you've done so far seems to be correct. However, you need to get rid of the sin. To do this, use s.
This is known as the inverse of sin, which is where you go from a fraction to the actual angle itself.
When you run through a calculator, you get about 11.537 degrees, or θ = 11.537.
To verify this, all you need to do is run sin (11.537), and the calculator returns 0.2, which is what we're looking for.
Hope this helps!