A box of mass mmm is pushed to cause an acceleration (a) on a frictionless ramp. The ramp has an angle θ. What is the magnitude of the push force (F)?

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?