The mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle. true or false.

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 image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?