Blog

Isa is handing out raffle tickets at the entrance of a festi…

Isa is handing out raffle tickets at the entrance of a festival. Each ticket comes with an identical copy. When Isa gives a ticket to a person, she places its matching copy in a jar beside her. At the end of the night, Isa counts the tickets in the jar to determine how many people attended the festival. Isa is using _____.

Courtney is a graduate student who is examining the relation…

Courtney is a graduate student who is examining the relationship between environmental stressors and gene expression. She is measuring cortisol levels in pregnant people and determining whether different cortisol levels are related to variations in their infants’ gene expression. Courtney is studying which determinant of behavior?    

Use the circuit diagram below to answer the questions that f…

Use the circuit diagram below to answer the questions that follow. (a)    What is the resistance of R1? [2] (b)    What is the current through R2? [2] (c)    What is the current through the energy source? [2] (d)    What is the total resistance in the circuit? [2]

A 2.0 m first-class lever has a load of 600 N located 0.5 m…

A 2.0 m first-class lever has a load of 600 N located 0.5 m from the fulcrum.  (a)    State the Law of the Lever. [1] (b)    Draw a diagram of the lever, showing the load, effort, fulcrum, effort arm, and load. (you do not need to submit the diagram, but it may help you answer the questions) (c)    Determine the effort force needed to balance the load. [2] (d)    If this lever has an actual mechanical advantage of 2, determine the percent efficiency of the lever. [2]

If done long enough, rubbing two sticks together can produce…

If done long enough, rubbing two sticks together can produce enough heat to start a fire.  If 100.0 J of thermal energy is required to start the fire and the average frictional force between the sticks is 20.0 N, the distance the sticks must slide past one other is: