A 15 GHz signal is injected into a vacuum-filled, copper Ku-band waveguide. The waveguide is connected to another Ku-Band waveguide, but this one is filled with polyethylene (assume semi-infinite waveguides). Design a quarter-wavelength matching section to eliminate reflections from this configuration. Draw a picture of the system (the three waveguide sections) and label all relevant dimensions and values.

Oxygen and hydrogen gas are at the same temperature t. what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?