We live in the Northern Hemisphere. The nation of Brazil is located in the Southern Hemisphere. Our Summer Equinox this year will occur this year on June 20. What will happen in Brazil on that day?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

When does your body conduct current more readily?

What do you think car designers do if the damage caused by a crash test is too severe?