04. Mostre que a energia cinética máxima Ek que um elétron pode possuir depois de participar de um espalhamento Compton é dada por: \[ E_{k}=\frac{h f}{1+\frac{\mathrm{mc}^{2}}{2 h f}} \quad \text { \&rivi } \]

Train moving with speed of \( (40 \mathrm{~m} / \mathrm{s}) \) the driver have resorted to the use of brakes to reduce the speed of the train movement by rate \( \left(-2 \mathrm{~m} / \mathrm{s}^{2}\right) \) Calculate: a) The amount of time it takes for the train even stops completely. b) The amount of distance traveled since the train began braking until it stops

Una palla di massa \( m_{1}=24 \mathrm{~g} \), che viaggia alla velocità \( v_{1} \), urta elasticamente una palla ferma di massa \( m_{2}=\frac{1}{2} m_{1} \). Dopo l'urto, la seconda palla va a colpire elasticamente una terza palla ferma, di massa \( m_{3} \). Tutti gli urti avven- gono lungo la stessa retta. Quale deve essere la massa \( m_{3} \) affinché la sua velocita dopo l'urto sia uguale a \( v_{1} \) ?

Un dipôle ohmique de résistance \( 3300 \Omega \) est traversé par une tension de 900 mV . Calculer l'intensité qui traverse se dipôle.

Un conducteur de résistance \( 65 \Omega \) est traversé par un courant de \( 0,1 A \). 1. Calculer la tension à ses bornes 2. On triple la tension à ses bornes, quelle est alors l'intensité qui la traverse?

EXERCISES It is known that the flow of fluid \( (\mathrm{Q} \) rate) is a fluid volume passing per unit time, based on the pressure gradient \( (\mathrm{P} / \ell) \) where \( (p) \) is the pressure between the ends of the tube flow stream, \( (\ell) \) is the length of pipe flow, also depends on the viscosity of the liquid \( (\eta) \) and the radius of the tube \( (r) \), by using the concept of compatibility between the units and dimensions theory derive a mathematical formula for flow rate depending on the variables mentioned above.