# Tutor profile: Lorenzo D.

## Questions

### Subject: Italian

How would you translate the sentence 'Ciao, il mio nome e' Andrea. Qual e' il tuo nome?'

The sentence can be translated as 'Hello, my name is Andrew. What is your name?'

### Subject: Applied Mathematics

A ball is dropped from the top of the leaning Tower of Pisa, 56 m high. How long does it take to hit the ground? At what speed is it then travelling?

Using the formula: s = v*t + (1/2)*a*t, where s = space, v = velocity, t = time, a = acceleration, and the values: s = 56 m, v = 0 m/s, a = 9.8 m/s^2, then t = 3.4 s Using the formula: v^2 = v0^2 + 2*a*s, then v = 33 m/s

### Subject: Biomechanical Engineering

What is the minimum stiffness of a medical device that substitutes the mechanical function of long bones, such as femur and tibia?

To calculate the stiffness of such medical device, the maximum stress experienced by the device must be considered, using the simplified formula: 'max stress = (force applied * device length at cubic power) / (48 * material elastic modulus * stiffness). Thus, the stiffness of the device can be deducted.

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