Two students are share how to calculate the kinetic and potential energy when the skateboard is halfway down the ramp. In the space below, explain which method is correct and why. Method A “The kinetic energy is half the skater’s original potential energy because they are halfway down the ramp.” Potential energy = mass • acceleration due to gravity • height Kinetic energy (halfway down) = potential energy/2 Method B “The kinetic energy is twice the skater’s original potential energy because they are halfway down the ramp.” Kinetic energy = ½ • velocity/2 Kinetic energy = 2 • (½ • mass • velocity)

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.