The correct answer to this proportionality problem requires calculating the number of calories in a portion of food.
Electrical energy is used to power a lamp.
Give a reason to support your answer. Correct responses gave reasons why the amount of light energy produced by a lamp is less than the amount of electrical energy used to power it. 1995-96 Students needed to understand that the first derivative is used to tell whether a function is increasing or decreasing, and the second derivative is used to indicate the concavity of a function. The velocity v is perpendicular to the electric field E . Students were provided with a diagram representing electrons moving at a given velocity and entering a perpendicular uniform electric field, and were asked to identify the path taken by the electrons in the electric field.