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PCN211 Physics of Medical Imaging
Questions:
- An astronaut has left an orbiting spacecraft to test a new personal maneuvering unit. As she moves along a straight line, her partner on the spacecraft measures her velocity every 2.0 s, starting at time t = 1.0 s:
Find the average x-acceleration, and state whether the speed of the astronaut increases or decreases over each of these 2.0-s time intervals:
- t1 = 1.0 s to t2 = 3.0 s;
- t1 = 5.0 s to t2 = 7.0 s;
- t1 = 9.0 s to t2 = 11.0 s;
- t1 = 13.0 s to t2 = 15.0 s.
- A car travels in the +x-direction on a straight and level road. For the first 4.00 s of its motion, the average velocity of the car is 6.25 m/s. How far does the car travel in 4.00 s?
- You normally drive on the freeway between Nicosia and Limassol at an average speed of 118 km/h. The trip takes 1 h and 10 min. On a Friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 70 km/h. How much longer does the trip take?
- When you stand on a moving bus, how do you arrange your feet to try to maintain stability and why?
- Why is a tripod stable?
- About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Measurements from 2005 estimate that this meteor had a mass of about 1.4 *108 kg and hit the ground at a speed of 12 km/s. How much kinetic energy did this meteor deliver to the ground?
- The normal force on the head of the femur in the knee is 300N. Find the frictional force for a normal (μ= 0.003) and arthritic (μ = 0.03) joint.
- What would happen if the coefficient of friction between a hand and the vault were too small during vaulting in gymnastics?
- The accelerating sprinter described in this chapter pushes off with 560 N force. If the net downward force on the foot on the ground is 3 mbgfor this 70 kg sprinter, what is the minimum coefficient of friction needed to prevent slipping? Under what conditions is this possible?
- Why can it be easier to walk and run on wet sand than on dry sand?
- Explain why sprinters start a race pushing off from blocks.
- Explain why circus performers doing tightrope and high-wire acts carry a long horizontal pole.
- Human Energy vs. Insect Energy. For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.0-mm-long, 0.50-mg flea can reach a height of 20 cm in a single leap.
- Ignoring air drag, what is the takeoff speed of such a flea?
- Calculate the kinetic energy of this flea at takeoff and its kinetic energy per kilogram of mass.
- Most humans can jump no more than 60 cm from a crouched start. What is the kinetic energy per kilogram of mass at takeoff for such a 65-kg person?
- Where does the flea store the energy that allows it to make sudden leaps?
PCN211 Physics of Medical Imaging
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