Vật A có khối lượng m1=50kg không vận tốc đầu di chuyển trong khoảng thời gian t1=10s, vật B di chuyển sinh ra biểu thức: m2=m1+m3 thì di chuyển được t2=20s. Bỏ qua ma sát và lực cản không khí, tính lực chịu tác dụng của vật?

The particles of an ice cube at 0°c (represented by the blue circles) come in contact with the particles of juan’s hand at 37°c (represented by the orange circles). which diagram correctly represents the temperature of the two substances and the direction of heat flow?

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.