May 14, 2010
Due Date: May 15, 2010: 7:30A.M.
- A person in a wheelchair with a total mass of 100kg is pushed from rest to a speed of 2.0m/sec. If the effective coefficient of friction is 0.05 and the distnace moved is 15m, (a) Calculate the work done. (b) Calculate the average force that must be exerted on the wheelchair to accomplish this.
- An artery has a length of 12cm and cross-sectional area of 0.40square centimeter. Find the elongation under a tension of 60N. The Young's modulus of artery is 5x10^7N/m^2.
- The energy consumption rate (metabolic rate) of a person can be measured by monitoring his or her oxygen consumption. Explain the relationship between oxygen consumption and energy consumption.
- In the orthodontic profession, a dentist uses braces to realign teeth. Discuss the process from the point of stress and strain.
