Answer:
69000 V
Explanation:
E = Electric field =
d = Distance between plates = 2.3 cm
When we multiply the electric field strength and the distance between the plates of a capacitor we get the maximum voltage.
Maximum voltage is given by
The highest voltage the students can use is 69000 V
Let be the speed of the helicopter in still air. Let
be the speed of the wind. Then, from the given information,
Adding the above 2 equations,
The speed of the helicopter in still air
Length of the pendulum (l) = 2 m
Acceleration due to gravity = g = 9.8 m/s^2
For small amplitude, the pendulum will undergo simple harmonic motion.
Hence, the time period of the pendulum for small amplitude =
Now, plug the values of l and g
T =
T = 2 × 3.14 × 0.451
T = 2.83 seconds
Hence, the time period of the pendulum for small amplitude = 2.83 s