Un bloque de acero tiene un peso de 30 N, y éste comienza a deslizarse sobre una superficie totalmente horizontal de madera, con ello se produce una fuerza de fricción es de -15 N. Calcule el coeficiente de fricción entre el acero y la madera.

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples