Learners mentally manipulate two-dimensional diagrams to visualize the objects in their three-dimensional forms.

In this learning activity, you'll discuss shifting perceptions of parents at different life stages.

Students read how to determine and calculate the void ratio for a given sample of soil or aggregate based on the weight-volume relationship.

Students read how to determine and calculate the saturated unit weight for a given sample of soil or aggregate, based on the weight-volume relationship. Practice problems complete the activity.

Students read how to determine and calculate the degree of saturation for a given sample of soil or aggregate based on the weight-volume relationship.

In this animated activity, students read about weight-volume relationships within a given sample of soil or aggregate. They complete problems using a 3-phase diagram.

Learners view a demonstration showing that line-neutral voltages and line-line voltages are not in-phase with each other, but have a definite 30-degree relationship.

Students read how to determine and calculate the dry unit weight for a given sample of soil or aggregate based on the weight-volume relationship.

Students read an explanation of the use of weight-volume relationships and practice calculating density.

Learners will examine the four steps to listen actively to improve relationships.

In this animated object, learners examine the relationship between pressure and temperature in an air conditioning system.

Students read how to determine and calculate the saturated density for a given sample of soil or aggregate, based on the mass-volume relationship. Practice problems complete the activity.

Students read how to determine and calculate the porosity for a given sample of soil or aggregate, based on the weight-volume relationship.

Students read how to determine and calculate the dry density for a given sample of soil or aggregate based on the mass-volume relationship.

Students read about the concept of unit weight relating to the 3-phase diagram and perform calculations.

In this interactive object, learners vary the value of the resistance to see how it affects current. Example problems are included.

In this animated learning object, students examine the addresses of PLC elements and how they pertain to I/O connections and internal memory files.

In this learning activity you'll examine how firewalls block viruses by discussing trusted, semi-trusted, and untrusted networks.

In this learning activity you'll explain how voltage and resistance in a series circuit affect current flow.

In this interactive learning activity, learners explore factors that contribute to the aging process. Learners calculate their age based on biological, psychological, and social experiences. Further reflection allows the learner to consider options and assess issues that impact the aging process.