Physics 18 Spring 2011 Homework 3 Wednesday February ... - Faculty

More documents

Recommendations

Info

$Influence of the relative refractive index on the depolarization of ...$

$Math Review and 1D Motion Worksheet - Faculty$

2. A net force of (6.0 N) î − (3.0 N) ˆj acts on a 1.5 kg object. Find the acceleration a. What is the magnitude of the acceleration, a? 2
3. Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton’s first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm. (a) A 60 kg person is in a head-on collusion. The car’s speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys. (b) Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag. (c) How do these two forces compare to the person’s weight? 3
Page 1: Physics 18 Spring 2011 Homework 3 W
Page 5 and 6: 5. A 65-kg student weights himself
Page 7 and 8: 7. A block of mass m is being lifte
Page 9 and 10: 9. A 2.0 kg block rests on a fricti

Physics 18 Spring 2011 Homework 3 Wednesday February ... - Faculty

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?