How many joules are needed to raise the temperature of 1 kg of gypsum plaster by 1°c? how many joules are needed to raise 1 kg of oak to the same temperature? if identical, steady fires were burning in identical rooms, except that one room is lined with wood and one room is lined with gypsum plaster, in which room would the walls tend to be hotter? (assume that the walls themselves are not

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine