Plants exhibit phototropism because
long roots plants absorb more water and nutrients
they need the sun's energy in order to produce food
water is essential to a plant's growth
strong stems are more wind resistant

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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

The law of reflection states that the angle of reflection is equal to the angle of