The position of a particle moving along X - axis depends on time according to the equation, x = 3t2 - t
3 – 4t + 5 , where x is in meter and t is in second
Calculate velocity and acceleration at t = 0, t = 2 and t = 4seconds
b. Calculate the average velocity between t = 2 and t = 4 seconds
c. Calculate average acceleration between t =1 and t =3 seconds

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

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?

What is the coefficient of kinetic friction μk between the block and the tabletop?