Một hộ gia đình sử dụng điện với dòng điện trung bình là 6 A. Tính điện năng
tiêu thụ và tiền điện mà hộ gia đình này
phải trả hàng tháng (thuế VAT là
10%). Biết trung bình mỗi ngày sử
dụng điện 12 giờ; giá tiền điện cho
trong bảng sau (chưa có VAT):

Bặc thang tính giá điện sinh hoạt
(kWh)
Giá bán điện
(đồng/kWh)
Bậc 1:0-50
Bậc 2: 51-100
Bộc 3: 101-200
Bậc 4: 201-300
Bậc 5: 301-400
Bậc 6: 401 trở lên
1.678
1.734
2.014
2.536
2.834
2.927

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?