Hai thành phố A, B cách nhau 40km. Cùng một lúc xe thứ nhất qua A với vận tốc 10km/h . Xe thứ 2 qua B với vận tốc 6 km/h. Viết phương trình mỗi xe trong hai trường hợp sau: a. Hai xe chuyển động theo chiều A tới B
b. Hai xe chuyển động ngược chiều nhau

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

J. j. thomson’s experiment disproved the theory that an atom