Explore BrainMass
Share

# Classical Mechanics

### Frequency of Vibration Denoted

A particular guitar string is supposed to vibrate at 199.1 Hz, but it is measured to actually vibrate at 214.2 Hz. By what percent should the tension in the string be changed to cause the string to vibrate at the correct fundamental frequency? [Enter the percentage only; do not enter units.]

### Calculating the tension of a string.

A solid object made out of lead has a volume of 24.0 cm3 and is supported (from above) by a string while the object is completely submerged in water. What is the tension in the string?

### moments of a system with trestles

How can I calculate the moments on a system with trestles?

### Centre of mass of a rod with varying density

The density of a linear rod of length L varies as &#961; = A+Bx where x is the distance from the left end. Locate the centre of mass.

### Calculating the commutator

Find the commutator: [F(x),p]. See attached file for full problem description.