Chiếu một tia tới nên gương phẳng. Nếu tia tới hợp với mặt gương một góc 30° thì góc phạn xạ bằng bao nhiêu

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to