Set the piece of plastic or wood on the table and push it steadily across the tabletop using your fingertip. note how much opposition to your push you feel. repeat the steps, but this time push the piece of plastic or wood across a rug, carpet, or piece of fabric. if you’re using fabric, be sure to secure the fabric so it doesn’t move. how does the opposition to motion on the tabletop compare with that of the rug, carpet, or fabric?

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Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

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?