A student who weighs 569 N climbs a stairway (vertical height of 2.5 m) in 30 s. (a) How much work is done?
(b) What is the power output of the student?
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The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?

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

Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder