Which of the following wires would have the least resistance? O a copper wire 10 cm in diameter
an iron wire 5 cm in diameter
O an iron wire 10 cm in diameter
O a copper wire 5 cm in diameter

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?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?