Un cuerpo se mueve a la derecha sobre una superficie horizontal áspera a una velocidad constante bajo la acción de una fuerza horizontal de 15 n. determine:
a) modulo y dirección de la fuerza de roce

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.