Two descriptions about physical quantities are given below: quantity a: it has the same unit as force. quantity b: it measures the amount of matter in an object. what quantities are these most likely describing?

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

The volume of a right circular cylinder can be approximated as follows: volume = ? r2h; where r is the radius of the cylinder and h is the height of the cylinder; ? is a constant that is roughly equal to 3. using the simple approximation above, calculate the volume of a right circular cylinder with a radius of 2 meters and a height of 7 meters

Un satélite artificial de un planeta x tiene un periodo de 8 horas y está colocado a una distancia de 50000 km del centro del planeta. a) ? cuál es la masa mx del planeta? b) ? cuál es el valor de la aceleración de la gravedad del planeta a la distancia en que está colocado el satélite? c) ? cuál es la velocidad orbital del satélite? d) si la masa ms del satélite es de 200 kg ? cuál es su energía de enlace?