A class is performing an experiment to keep an ice cube solid as long as possible. Which student's actions could be a source of error in this experiment?

A. Jerrie wrapped the ice cube loosely in several layers of cotton and aluminum foil.

B. Jody outlined the ice cube to measure it before it started to melt.

C. Carey put the ice cube in cold water and recorded the temperature every 2 minutes as the ice cube melted.

D. Angelina waited until the next day to observe the ice cube and O record how long it took to melt.

Based on the graph, how would you describe the net forces acting on the moving object? a) net force equals zero. b) net force is greater to the right. c) there is no way to determine net force. d) net force is positive and to the right.

Assuming weightless pulleys and 100% efficiency, what is the minimum input force required to lift a 120 n weight using a single fixed pulley?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?