Một đoàn tàu đang chạy với vận tốc v 4 (km/h) thì đi vào tìột đoạn đường cong dài 2(km) bán kính 4000(m ) tàu chạy nhanh khoảng thời gian 1,5 phút. Tính vận tốc dài, gia tốc tiếp tuyến, gia tốc pháp tuyệt tà tốc loài phân chia đoàn tàu ở cuối quãng đường đó

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element