You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.0 cm . you have a helium-neon laser (λ=633nm) and a 0.11-mm-diameter pinhole. part a how far behind the pinhole should you place the viewing screen? express your answer to two significant figures and include the appropriate units.

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class