Question

Va rog ajutatima si pe mine cu trei probleme dau coroana:

1. v=?

$m/s$

delta d= 200 Km
delta t= 1h 10 min.


2. ro= 7,8g/cm^3
m=2000g
V=? in m^3


3. K=200N/m
l1=7cm
l2=2cm
F=?​

Answer 1

1. v= delta d/ delta t
v= 200km/1h10min
v=200000m/4200s
v=47,61 m/s

2.V=m/ro
V=2000g/7.8g/cm^3
V=256,41 cm^3 = 0,00025641 m^3

3. delta l = l1 - l2
delta l = 7-2 =5 cm =0.05 m
F= delta l x k
F= 0.05 m x 200N/m = 10 N


Sper ca aceste calcule sunt corecte