Julie sets up a uniform lever with the mid-point of the lever sitting on the pivot She places one weight on end Y of the lever as shown

Carefully, she puts an equal weight at end X
What will happen to the lever?

The lever will not move.
The lever will move to the horizontal position.
The lever will move past the horizontal position and
then return to the horizontal position.
The lever will come to rest with the end Y on the horizontal
surface.

28. a stone is projected at a cliff of height h with an initial speed of 42.0 mls directed at angle θ0 = 60.0° above the horizontal. the stone strikes at a, 5.50 s after launching. find (a) the height h of the cliff, (b) the speed of the stone just before impact at a, and (c) the maximum height h reached above the grou

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?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid