Compare and contrast the reactivity and number of valence electrons of Sodium, Potassium and Francium referencing periods and groups. Compare and contrast the reactivity and number of valence electrons of Sodium Potassium, and Francium referencing periods and groups?​

Four objects are being tested to see how they are affected by fluid friction. object w has a surface area of 4.5 cm2, object x has a surface area of 2.5 cm2, object y has a surface area of 6.2 cm2, and object z has a surface area of 3 cm2. which object would experience the most fluid friction?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm