A. | B. | C. | D. |
θ |
2 |
θ |
2 |
2x | ||
cos
|
E |
R |
B?2xtan
| ||||||
R0(2xtan
|
2Btan
| ||||||
R0(2tan
|
θ |
2 |
2x | ||
cos
|
A.电压表的示数大于18V |
B.电阻R2两端的电压大于12V |
C.电阻R1两端的电压大于6V |
D.电阻R3两端的电压为12V |
A. | B. | C. | D. |
A.电阻R1消耗的热功率为Fv/3 |
B.电阻R2消耗的热功率为Fv/6 |
C.整个装置因摩擦而消耗的热功率为μmgvsinθ |
D.整个装置消耗的机械功率为(F+μmgcosθ)v |
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