Dynamics Exam 2 Solutions

Dynamics Exam 2 Solutions - Name_KEY Last First UNLV...

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

Name:________ KEY _______ Last First UNLV, DEPARTMENT OF MECHANICAL ENGINEERING ME 242, SPRING 2009, Second TEST Closed Book, one page of handwritten notes allowed. Enter the answer for each question into the space provided. Enter SI units in all answer spaces with brackets ( ). 1. (15 points) The mass (m = 10 kg) is released from rest at A on a frictionless surface. Determine (a) the velocity at point B (7 points) (b) The total reaction force at B (8 points) Use energy method, Datum at B (a) V1 = T2 m*g*h = 0.5*m*v B 2 Æ v B =sqrt(2gh) = 4.43 m/s B (b) Total reaction at B is N B = mg + mv /r B 2 N B = 10*(9.81+ 19.62/0.5) = 495 N B Answer v B = 4.43 m/s v B B B = 6.26 m/s N B = 495 N N B B B = 264 N 2. (20 points) Point masses A and B are linked by a pulley and released from rest as shown, with B positioned at 1.5 m above ground while gravity is present. (a) Draw a free body diagram of the system. Use the back of the page for the diagram. Answer a: at left (b) Determine the time at which mass B hits the

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.

{[ snackBarMessage ]}

Page1 / 3

Dynamics Exam 2 Solutions - Name_KEY Last First UNLV...

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

View Full Document
Ask a homework question - tutors are online