Question

Nomor 3 , 4, dan 5 tolong ya

Answer 1

3) dik:
s = 3,6 m
h = 80 cm = 0,8 m
m = 90 kg
KM =...?
F = ...?

KM = s/h = 3,6/0,8 = 4,5 

F = w*h / s
F = (mg)*h / s
F = (90*10)*0,8 / 3,6
F = 720 / 3,6
F = 200 N

4) dik:
l = 12 cm
r  = 1,4 cm
d = (panjang skrup / banyak uliran) = 12/48 = 0,25 cm
π =22/7
KM = ....?

KM = 2πr/d
KM = (2 * 22/7 * 1,4 ) / 0,25
KM = 8,8 / 0,25
KM = 35,2 


5) dik:
m = 1 ton = 1000 kg
h = 2 m
t =20 s
W = ...?
P =...?

w = mg
w = 1000 . 10 = 10.000 N
Katrol tunggal, w = F, maka

W = F . h
W = 10.000 * 2
W = 20.000 Joule

P = W/t
P = 20.000 / 20
P = 1000 Joule/s (watt)