3. same questions as the previous problem, but for mass m just falling 3 meters in a vacuum: (a) how long does it take mass m to fall 3 meters? (b) what is its final velocity (with direction)? (c) explain what physics principle makes (b) be the same or different in problems (2) and (3).

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

The consumption of fossil fuels could be

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.