Which chemical equation represents a double replacement reaction? O
2Na+CI, + 2NaCI
NaOH + HCI NaCl + H2O
Zn + 2HCl → ZnCl, +H,
2KCIO, 2KCl +30,

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

While carrying a heavy box up the stairs,you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr