Can Someone Check My Work

samedi 31 août 2013

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Question 1

1.1) 5 m.s

1.2) Acceleration

1.3) 10 m.s^-2

1.4) Displacement equals area under graph = 1/2*b*h = 1/2*2*10 = 10 m

1.5) vf = vi+at

0 = 10 + 10t

t = 1's + 2's = 3's

1.6) 1/2*1*10 = 5m

Position of ball = 10-5 = 5m

Question 2

2.1) Total mechanical energy in an isolated system is conserved

2.2) Total Mech Eergy at A = Total Mechanical Energy At B

Mech at A = mgh

= 1.5*9.8*0.6

= 8.82 J

Emech = mgh+Ek

8.82 = 1.5*9.8*0.2 +ek

ek = 5.88 J

2.3) Velocity a B:

Ek = 0.5mv^2

5.88 = 0.5*1.5*v^2

v = 2.8 m.s

Wnet = Work done by water

Wnet = change in ek

= 1/2m(vf^2-vi^2)

= 0.5*1.5(0-2.8^2)

= 5.88 J