exam-M10-2 - PHY 2048 Midterm Exam Spring 2010 2 Use g =...

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

View Full Document Right Arrow Icon
PHY 2048 Midterm Exam Spring 2010 Use g = 9.80 m/s and G = 6.67 × 10 -11 Nm 2 /kg 2 . 2 1. [15 points] A wagon of mass 7.21 kg has an initial velocity of + 2.87 m/s. If the wagon $ i comes to rest after moving 5.88 m, what force acted on it? Assume the force $ i is constant and ignore friction. 2. [10 points] A constant force = ( – 18.6 ) N acts through a straight-line r F $ j displacement = ( + 3.91 – 3.64 ) m. Calculate the work done. Δ r r $ i $ j 3. [20 points] A block of mass 3.85 kg is on a horizontal surface whose coefficient of friction is 0.218. A force F = 51.4 N is applied at an angle of θ = 18.6 deg as shown in the drawing. (A) Draw a free-body diagram for the box showing all forces in terms of their x and y components: (B) Calculate the speed of the box 3.5 s after it starts from rest. 4. [5 points] True or False: The net force on an object is zero if the object is traveling at a constant speed. Explain your answer in one sentence.
Background image of page 1

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

View Full DocumentRight Arrow Icon
5. [15 points] A 7.11 kg mass, initially at rest, is struck by
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/30/2011 for the course PHY 2048 taught by Professor Laposky,e during the Fall '08 term at Tallahassee Community College.

Page1 / 2

exam-M10-2 - PHY 2048 Midterm Exam Spring 2010 2 Use g =...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online