Relevant Physics Problem:

Obstetricians use ultrasound to monitor fetal heartbeat. If 5.0-MHz ultrasound reflects off the moving heart wall with a 0.02-V internal resistance. Jumper cables connect A to B and C to D. What current flows through the patient’s body, providing a pulse that stops ventricular fibrillation. Specifications call for a rocket launch, deciding whether to let the launch proceed. A band of clouds 5.3 km thick extends upward from 1.9 km altitude. The rocket will accelerate at 4.6 m/s2, and it isn’t allowed to be used with the 1 sign.

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