Ablock of 5 kg moves with v = 6 m/s on a horizontal surface without friction, addressing a spring whose constant elastic is equal to 400 n/m and having one of its ends attached to a wall. the mass of the spring is negligible.
a) the maximum distance that the spring can be compressed.
b) if the maximum distance that the spring could be compressed was 0.150 meters, what would be the value of v?

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?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

By what primary heat transfer mechanism does the sun warm the earth?