Create Your Own the most recent generation of residential satellite dishes that are a little less than half a meter in diameter. Construct a problem in which you calculate the power received by the dish and the maximum electric field strength of the microwave signals for a single channel received by the dish. Among the things to be considered are the power broadcast by the satellite and the area over which the power is spread, as well as the area of the receiving dish.
Linear Momentum - Product if mass and velocity of an object - ⃗ = ⃗ - SI unit: kg*m/s - A vector - The total momentum of a system of objects is the vector sum of the momenta of all the objects - ⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗ +⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗ + ⋯ 1 2 3 Momentum and Newton’s Second Law ⃗ - Ʃ = ⃗ - The net force acting on an object is equal to the change in its momentum divided by the time interval during which the change occurs ⃗⃗⃗⃗ - Ʃ = Impulse - Product of force and contact time - impulse = force * time = F * t - Great force for long time equals large impulse - Same force for short time equals smaller impulse - = ⃗⃗⃗⃗ - SI unit: N*s = kg*m/s - A vector - Impulse and Momentum o = ⃗ = ⃗ o Therefore, the same change in momentum may be produced by a large force acting for a short time, or by a smaller force acting for a longer time. Impulse Changes Momentum - Cases of momentum changes: o Decreasing momentum over a longer time results in smaller force - When a car is out of control, it is better to hit a haystack than a concrete wall. o Same impulse occurs either way, but extension of hitting time reduces hitting force. Conservation of Momentum - The interaction forces
