Question

ajutor pls pls subiect 1

Answer 1

Răspuns:

2.F=2N

m=100g=0.1kg

F=ma

a=F/m

a=2N/0.1kg

a=20m/s^2

3. m=60kg

d=20m

t=4s

Ec=mv^2/2

v=?

x=xo+vt

x=vt

20m=v4s

v=20/4

v=5m/s

Ec=60kg*25/2=30*25=750J

4.L=mglsinα

5.Legea lui hook:

L/lo=1/E*F/S ] *ES

ESL/lo=F]*lo

ESL=Flo]:F

ESL/F=lo

ESL/mg=lo(b)

La primul exercitiu nu se vede bine.