the rate of change of velocity of a bullet fired into a sand pile is directly proportional to the square root of the velocity of the bullet. Write and solve a differential equation that expresses the rate of change of the bullet's velocity

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 most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Arrange the images in order to show how lake-effect snow occurs.