Light with a wavelength of ? = 633 nm is shone first on a single slit of width w = 4.5?m. The single slit is then replaced with a double slit separated by a distance w. The ratio of the single slit angle to the double slit angle for the first dark fringe is R?.

Find the ratio between these angles numerically.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

The heliocentric and the geocentric models of the solar system included these central principles