PHYS
2a-set7

# You extend the block out to 11cm and let it go what

• Notes
• 1

This preview shows page 1. Sign up to view the full content.

equilibrium position. You extend the block out to 11cm and let it go. What is the work done by the spring on the block between 5cm and 3cm? 6. A block of mass 5kg slides down a frictionless incline of 30 0 at a speed of 10m/s when it hits a rough patch which causes the block to stop sliding after traveling 10 meters. a) What was the work done by friction? b) How much heat was created by the time the block traveled 3 meters along the patch of friction? 7. Which of these forces are conservative: (c is a constant and x is the unit vector in the x direction in all equations) a) F = c(x – x 0 ) 3 x , where x 0 is a constant. b) F = c v x x c) F = [c/(x 2 )] x d) F = -cx x if v x > 0 and F = cx x if v x < 0 8. A 10kg block slides down a 45 0 inclined plane with a coefficient of kinetic friction u = .5. The block has an initial velocity of v 0 and initial position x 0 at time t=0. It travels 3 meters before it comes to a stop. a) What was its initial velocity, v 0 ? b) How much heat was generated by friction between x = x 0 + 2 and x = x 0 + 2.5 meters? 9. A 100kg motorcycle has an engine that can output 3kW of power. If a rider of mass 80kg rides the vehicle up an incline of 30 0 , what is the top speed they can achieve? Answers: 1. v 1 = -2 m/s, v 2 = 3 m/s both in x direction 2. 90 Joules 3. -176.4 Joules 4. a. 3 Joules, b. 6 Joules, the force is not conservative 5. 7.2 Joules 6. a. -250 Joules, b. -75 Joules 7. a and c are conservative, b and d are not. 8. a. 4.56m/s b. 17.3 Joules 9. 12.24 km/hr
This is the end of the preview. Sign up to access the rest of the document.
• Fall '07
• Hicks
• Force, 4cm, 3cm, 5cm, 3 m/s, 3kW

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern