q1)the period (T) of a pendulum swing is the time taken in seconds for the pendulum to complete one swing. The period is dependant upon the length of the pendulum according to the formula
T=2pie (square root of L divided by 9.8) L= the length of the pendulum in metres.
Determine the time (T) if the clocks pendulum to complete one swing when the pendulum (L) is .85 metres long?
q2) a person pushes her daughter on a swing ands finds that it takes the girl on the swing 7 seconds from where she is let go to when she returns.How long is the rope of the swing to the nearest metre?
Q1) I=_E_
R+r
I is amps E is emf R is resistance ohms r is internal resistance ohms
an unknown battery is connected to a 4 ohm resistor which causes a current of 2 amps to flow in the circuit.When the battery is connected to a 2 ohm resistor a current of 3 amp flows.
show the following 2 equations are formed from this data.
E-2r=8 E-3r=6
solve this equations simultaneously to find the emf (E in volts) and the internal resistance (r in ohms) of the battery.
Using the substitution method:
Solve the second equation for, say, E:
and insert that value of E into the first equation:
Now plug that value of r into either of the original equations (or the one we solved for E):
(Don't forget to put in the appropriate units when giving your answer.)
-Dan