A 175 kg dirt bike starts from rest and accelerates at a constant rate along a distance of 400 m. The applied force is 250N and the coefficient of kinetic friction is 0.03 A Find the net force applied on the dirt bike

B Find the acceleration of the dirt bike

C What is its speed at the end of the 400m

D Find the elapsed time of its acceleration

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?

Observations show that interstellar clouds can have almost any shape and

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?