Which best explains how thermal energy is transferred when someone holds a hand above a fire?

It is transferred by conduction and radiation.
It is transferred by only convection.
It is transferred by only conduction.
It is transferred by radiation and convection.

Energy transformations that involve one transformation from one type of energy to another are called transformations.

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.

Aipal measures a circuit at 1.2 a and 24 . using ohm’s law, what can he calculate for the circuit?