07_P41InstructorSolution

# 07_P41InstructorSolution - 7.41. Model: Assume the particle...

This preview shows pages 1–2. Sign up to view the full content.

7.41. Model: Assume the particle model for the book (B) and the coffee cup (C), the models of kinetic and static friction, and the constant-acceleration kinematic equations. Visualize: Solve: (a) Using () 22 10 1 0 2, xx vv a x x =+ ( ) 2 1 0 m /s 3.0 m/s 2 ax 1 4.5 m /s ax ⇒= To find 1 , x we must first find a . Newton’s second law for the book and the coffee cup is () () ( )( ) 2 on B B G B B cos20 0 N 1.0 kg 9.8 m/s cos20 9.21 N y Fn F n = °= = () () on B k G B B B sin 20 x FT f F m a =− − ( ) on C G C C C y F m a =− = The last two equations can be rewritten, using CB , aaa = = as kB B B sin 20 Tn m g m a μ −− ° = CC Tm gm a −= Adding the two equations, ( ) ( ) k sin20 9.21 N am m gm m += + ° ( ) ( ) ( ) 2 1.5 kg 9.8 m/s 0.500 kg 1.0 kg sin 20 0.20 9.21 N a + ° ⎡⎤ ⎣⎦ 2 6.73 m/s a Using this value for a , we can now find

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 12/10/2011 for the course PHYS 1211 taught by Professor Geller during the Fall '09 term at UGA.

### Page1 / 2

07_P41InstructorSolution - 7.41. Model: Assume the particle...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online