Question

Doy corona al quién me ayude en éstas preguntas ​

Answer 1

Respuestas:

1-

Datos :

500 g = 0,5kg

80cm = 0,8 m

g = 10m/s (considere a la gravedad como 10 m/s)

Formula -> Ep= mgh

Ep= 0,5 kg*10m/s* 0,8m

Ep= 4J

2-

Datos:

Coche  1

m=2000kg

V=36km/h= (1000m/1km) (1h/3600s)=10m/s

Coche2

m=2000kg

V=72 km/h = (1000m/1km)*(1h/3600s)=20m/s

Formula -> Ec= (1/2)*(m)*(v)²

Coche 1

Ec= (0.5) (2000kg) (10m/s)²

Ec= (0.5) (2000kg) (100 m²/s²)

Ec=100,000 J  

Coche 2

Ec= (0.5) (2000kg) (20m/s)²

Ec= (0.5) (2000kg) (400 m²/s²)  

Ec=400,000 J  

3-

Datos:

m = 500kg

v = 100km/h *(1000 m/1km)*(1h/3600s) = 27,7 m/s

Formula -> Ec= (1/2)*(m)*(v)²

Ec= (1/2)*(500kg)*(27,7m/s)²

Ec =192901,2J

4-

Datos:

m = 650 kg

Vi = 90 km/h (1000 m/1km) (1h/3600s)= 25 m/seg

Vf = 50 km/h (1000 m/1km) (1h/3600s)= 13,89 m/seg

Ec inicial

Ec = 1/2 m* Vi²

Ec = 1/2 650kg * (25m/s)²

Eci = 203.125 J

Ec Final

Ec = 1/2 m* Vf²

Ecf = 1/2 *650 kg (13,89m/s)²

Ecf  = 62.702,93 J

5-

m = 840 kg

Ep = 34354 J

Ep = mgh

34354J = 840 kg * 10 m/s * h

34354J = 8400 N* h

34354 J/ 8400 N = h

4,09 m = h

6-

v = 9,81 m/s

Ec = 324 J

Ec = 1/2 m v^2

(2* Ec)/ v^2 = m

2* 324 J / (9,81m/s)^2 = m

6,73 kg =m  

Espero haberte ayudado, saludos.