Question

urgent va rog mult macar 3 exercitii !!!
dau coroana ​

Answer 1

Răspuns:

1. Ec= mxv²/2= 0,45 kg x v²/2

=> 1,764=0,45 x v²/2

=> v²= 1,764 x 2/0,45

=> v²=3,528/0,45

=> v²=7,84

=> v=2,8 m/s

=> d)

2. Ep= m x g x h

Ep= 0,055 kg x 10 x h

10,01=0,55 x h

h=10,01/0,55

h=18,2 m

=> c)

3. E = Ec + Ep

16,17 = 11,79 + Ep

16,17 - 11,79 = Ep

4,38=Ep

Ep = 4,38

=> d)

4. => a)

5. L = F x d

18,5 = 2,5 x d

d = 18,5/2,5

d = 7,4 m

=> e)