Un bloque cuya masa es de 8kg es jalado mediante una fuerza horizontal, como se puede observar en la figura a) la magnitud de la fuerza de reacción (R) que ejerce sobre el bloque b) la magnitud de la fuerza horizontal (f) que se requiere para dar al bloque una velocidad horizontal con magnitud de 4m/s en 1.5s a partir del reposo

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm