1- Un aro de radio 10 cm que gira con movimiento circular uniforme rueda una distancia de 62,8 m en 49 segundos. calcular a) La rapidez circular de un punto del borde del aro b) La rapidez angular del aro c) Numero de vueltas que dio d) Periodo e) Frecuencia

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.