Câu 47. Cho mạch điện như hình vẽ. Các nguồn giống nhau, mỗi nguồn CÓ:
e = 2,5V = 22, R = R = 42, R1 = 32, RA rất nhỏ, B là bình điện phân (CuSO4Cu). Biết la = 0,75A.
R
Tinh
a. Suất điện động và điện trở trong của bộ nguồn.
b. Điện trở của bình điện phân.
c. Lượng Cu bám vào caoả sau 32 10

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Aswimmer is determined to cross a river that flows due south with a strong current. initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. in which direction shoud the swimmer head? a. the swimmer should swim southeast. b. the swimmer should swim south. c. the swimmer shuold swim northeast. d. the swimmer should swim due north. e. the swimmer should swim due east.

The precision of a voltmeter is ±0.005 v. the accepted value for a measurement is 9.016 v. which measurement is in the accepted range? 9.005 v 9.006 v 9.018 v 9.025 v