Có 6,5 g khí Hydro (coi là khí lý tưởng) ở nhiệt độ 270C, nhận nhiệt và giãn nở đẳng áp, tăng thể tích gấp đôi. Tính nhiệt lượng đã cung cấp cho khối khí trong quá trình này.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical