A proton moves straight upward (away from the ground) through a uniform magnetic field that points from east to west and magnitude of 2.5 T. If the proton moves with a speed of 1.5x10 ^7 m/s through this field, what force (magnitude and direction) will act on it?

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.