Achair of weight 80.0 n lies atop a horizontal floor; the floor is not frictionless. you push on the chair with a force of f = 44.0 n directed at an angle of 43.0 ∘ below the horizontal and the chair slides along the floor. using newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair. express your answer in newtons.

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?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

What properties of a moving object are used in determining the object's energy of motion