How does distance change when the amount of effort force is increased while the amount of work dine remains the same

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47

Aproton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?