Đểnén 10 lít không khí đến thểtích 2 lít, người ta có thểtiến hành theo hai cách:nén đẳng nhiệt hay nén đoạn nhiệt. Hỏi cách nén nào tốn công ít hơn

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 considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

If the new moon happens on january 15th, what shape will it be on february 6th?