Un bloque de masa (5 Kg), se desplaza por un plano inclinado con un ángulo de 20°, sabiendo que el coeficiente de fricción entre elplano y el bloque es de 0,3. Determine A)Fuerza normal (N), B)Fuerza de fricción (fr), C)Componente en x del peso (Px), D) Componente del peso en y (Py) y E)la aceleración del sitema (a).

Acylindrical specimen of a nickel alloy having an elastic modulus of 207 gpa (30 × 106psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 n (2000 lbf) is applied. compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.)

Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg

Modify the equation fδt=δ (mv) to find the force of friction.