jodi made a list about electric current to her study for a test.
1) movement of electrons is continuous in a current.
2) electrons move from areas of low to high electric potential.
3) voltage causes current to flow.
4) rate at which current flows is measured in amperes

which best describes jodi’s error?

the movement of electrons is not always continuous.

electrons move from areas of high to low electric potential.

resistance causes current to flow.

the rate at which current flows is measured in ohms.

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.