Bài 5.8. Một vật nhỏ có khổi lượng mi = 0,3kg trượt xuống từ điểm A dọc theo đường dốc không ma sát có chiều cao h = 0,1m (hinh 5.18). Tại điểm thấp nhất B, nó va chạm với một vật khối lượng m2 = 0,4kg dang đứng yên. Tìm độ cao lớn nhất mà các vật đạt duoc so với mặt phẳng ngang sau lần va chạm thứ nhất trong hai trường hợp: Hình 5.18 a. Va chạm mềm b. Va chạm đàn hồi xuyên tâm.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c. the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.