1a) W1=W2 = mgh
2a) P1 > P2 , mgh/25 >mgh/35
2) W=Fs=80•10 =800 J
1.) Two people of the same mass climb the same flight of stairs. The first person climbs the stairs in 25 s; the second person does so in 35 s.
a) Which person does more work?Explain
b) Which person produces more power?Explain
2.) Lee pushes a 20 kg mass 10 m across a floor with a horizontal force of 80 N. Calculate the amount of work Lee does.
5 answers
The work done = potential energy gained = m g h.
That is the same for both since m, g and h are the same for both
The power is the work per unit time.
Power = m g h/t
so smaller t ---> bigger power
That is the same for both since m, g and h are the same for both
The power is the work per unit time.
Power = m g h/t
so smaller t ---> bigger power
Calculate the work done when a person push acar from stationany position to a
distance of 50m appliny a. force of 200n.
distance of 50m appliny a. force of 200n.
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2 answers