In lab, a radiation detector was used to calculate the background radiation. The readings taken every minute were recorded in the table below. What is the reason
that the readings are not the same every minute?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

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.