ITT Technical Institute

Framingham, Massachusetts

Quarter 6 Electronics Physics

Instructor: Paul BurneyName __________________________________

Work, Energy, and Power (Test #6)

Instructions:Please solve the following problems. Credit will be given for work completed so make sure to show it! Some helpful information can be found below.

Work & Power Formulas

Energy FormulasW = F d cos q

W

_{gravity}= mghW

_{spring}=^{1}/_{2 }kx^{2}P = W / t

E

_{initial}= E_{final}U

_{initial}+ K_{initial}= U_{final}+ K_{final}U

_{gravity}= mghU

_{spring}=^{1}/_{2 }kx^{2}K =

^{1}/_{2 }mv^{2}1) Two movers are having a dispute:

- Mover one says that it will be easier to put a cart on the truck by pushing it up the ramp.
- Mover two says that it doesn't matter since they'll be doing the same amount of work.
Circle the best answer:

Explain your reasoning:

Mover one is correctMover two is correctBoth are correct to some extent

2) A young girl drags her favorite dolly by the hair at an angle of 55° to the ground for a distance of 4 m.a) If she pulls with a force of 3 N, what is the total work that she has done?

b) If it takes her half a minute to travel the four meters, what is the girl's power?

3) In the roller coaster ride below, the car starts at a speed of 3 m/s at point A. What is its speed when it reaches point C?

4) A 3.5 kg artillery shell is shot out of a cannon at 375 m/s. If it plunges 1.3 m into an enemy bunker, what is the average force that the shell exerts on the bunker wall?