Dos estudiantes trabajan juntos en un experimento de Física. Uno de ello, Juan, tiene un dibujo en que hay un segmento dirigido. Éste dice que se trata de una de las fuerzas con las que ambos están trabajando. Toma una regla y mide, como se muestra en la figura. Según él, la fuerza tiene una magnitud de 4.00 N. El otro estudiante, Pedro, le replica, diciéndole que tiene un error, que él ha medido la fuerza, usando un dinamómetro y que el valor obtenido es 8.0 N.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

This problem has been solved! see the answera non-uniform fire escape ladder is 6.0m long whenextended to the icy alley below. it is held at the top by africtionless pivot, and there is neglibible frictional force fromthe icy surface at the bottom. the ladder weighs 250n, and it'scenter of gravity is 2.0m along the ladder from the bottom. amother and child of total weight 750n are on the ladder 1.5m fromthe pivot. the ladder makes an angle θ with the horizontal. find the magnitude and direction ofa) the force exerted by the icy alley on the ladderb) the force exerted by the ladder on the pivotc) do your answers in part a and b depend on the angle?

The velocity of car is 80.0 miles per hour. what is the velocity of car in meters per second? (1 km -0.621 miles) m/s