Answer:
V(t) = (q0/C) * e^(−t/RC
)
Explanation:
If there were a battery in the circuit with EMF E , the equation for V(t) would be V(t)=E−(RC)(dV(t)/dt) . This differential equation is no longer homogeneous in V(t) (homogeneous means that if you multiply any solution by a constant it is still a solution). However, it can be solved simply by the substitution Vb(t)=V(t)−E . The effect of this substitution is to eliminate the E term and yield an equation for Vb(t) that is identical to the equation you solved for V(t) . If a battery is added, the initial condition is usually that the capacitor has zero charge at time t=0 . The solution under these conditions will look like V(t)=E(1−e−t/(RC)) . This solution implies that the voltage across the capacitor is zero at time t=0 (since the capacitor was uncharged then) and rises asymptotically to E (with the result that current essentially stops flowing through the circuit).
Answer:
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Explanation:
Vs/Vp = Ns/Np
Vs/9 = 30/300
Vs/9 = 1/10
Vs= 9/10 = 0.9 volts
It is a Step down transformer. This is because the number of turns on the primary coil is greater than that on the secondary coil.
Answer:
For other liquids, solidification when the temperature drops includes the lowering of kinetic energy, which allows molecules to pack more tightly and makes the solid denser than its liquid form. Because ice is less dense than water, it is able to float at the surface of water.
Explanation:
have a great day:)
Answer:
The answer is 45 degree angle
Answer:
3335.3r/m
Explanations:
For an object in the centrifuge it is assumed to be traveling at a constant circular speed. In this case there is no tangential acceleration on the object. It is only accelerated outwards at an acceleration given by v^2/r where v is the constant speed and r is the radius of the circle in which it is moving.
The required acceleration of the object in the centrifuge is 944 times that of the gravitational acceleration. This is equal to 944*9.8 = 9251.2 m/s^2.
The radius of the centrifuge is 7.02 cm = 7.02*10^-2 m.
To produce the required acceleration the linear velocity is v, where
a =v^2/(7.02*10^-2) = 9251.2m/s
=> v^2 = 9251.2*7.02*10^-2
v^2 = 649.43
v = √(649.43)
=> v = 25.484 m/s
The angular velocity in terms of revolutions per second is 25.484/(2*pi*7.02*10^-2) = 56.7 revolutions/second.
For revolutions/minutes
Since 60s - 1m
1s - 0.017m
So 56.7r/0.017m = 3335.3r/m
The centrifuge has to rotate at 3335.3 revolutions/minutes to achieve an acceleration equal to 944 times that of the gravitational acceleration.