Jawaban:

1.

a. 2,55x10^17

b. 3,0065x10^-6

2.

V= 10,5x10,5x10,5 = 1157,625 cm^3

3.

m = 400kg

a = 2 m/s^2

ΣF = ma

W - T = ma

mg - T = ma

T = mg - ma

T = 400*10 - 400*2

T = 4000 - 800 = 3200 N

4.

m = 1 kg

s = 6m

Vo = 2 m/s

Vb = ?

ΣF = ma

F cos 60 - f = ma

20 cos 60 - 5 = 1a

20*0,5 - 5 = a

a = 5 m/s^2

S = Vot + 1/2 a t^2

6 = 2.t + 1/2 *5 *t^2

6 = 2t + 2,5t^2

2,5t^2 + 2t - 6 =0

dengan rumus pers. kuadrat diperoleh t = 1,2

Vt = Vo.t + at

Vt = 2*1,2 + 5*1,2

Vt = 2,4 + 6 = 8,4 m/s   kec benda di B

5.

m1 = 4 kg

m2 = 6 kg

m3 = 10 kg

Vt = Vo + at

μ = 0,1

5.

ΣF = ma

W3 - fk1 - fk2 = (m1+m2+m3)a

m3g - μ m1g - μ m2g = (m1+m2+m3)a

10*10 - 0,1*4*10 - 0,1*6*10 = (4+6+10)a

100 - 4 - 6 = 20a

a = 90/20 = 4,5 m/s^2

Pada benda 3

ΣF = ma

W3 - T = ma

m3g - T = m3a

10*10 - T = 10*4,5

T = 100 + 45 = 145 N

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