1) A car with an initial velocity of 10.8 km/h experiences an acceleration of - 0.82 m/s2 for 2.0 s.
(a) Calculate the car’s final speed.
(b) What is the car’s displacement?

2)A plane traveling at – 45 m/s slows down to – 15 m/s in a time of 8.0 s.
(a) What was the planes displacement during this
time?
(c) What was the plane’s acceleration during this time?

I need help asap ;-_(

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?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above