A transformer consists of 175 primary windings and 704 secondary windings. The emf of the primary coil is 28.0 V. What is the emf across the secondary coil?
A. 56.0 V
B. 98.7 V
C. 189 V
D. 113 V

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.