No system is completely closed off from its surroundings. Which example represents a system that is almost completely closed?

a campfire

a sealed, insulated cooler

a bowl of soup

a filled bathtub

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.

A5.0 kg box is on a frictionless surface. two forces act on the box as shown below. which best describes the motion of the box? the box will not move. the box will accelerate to the right. the box will move to the right with constant velocity. the box will move to the left with decreasing speed.

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?