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.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

The slope of a velocity time graph over any interval of time gives the during that interval

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?