Apoint source of light illuminates an aperture 4.00m away. a 18.0 cm -wide bright patch of light appears on a screen 2.00m behind the aperture.
i have been trying to use the equation w=(2*wavelength*distance)/aperature width. however, i am not given wavelength and the type of light is not specified. also, does the source of light being 4.00m away from the aperature even matter?

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery

Which articulations allow for greatest range of motion?