PhysicsCh3 - 1. Two forces act at a point object as...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1. Two forces act at a point object as follows: 100N at 170.0 degrees and 100N at 50.0 degrees. Find their resultant. The x-component is 100cos50.0 100cos170.0 34.202 34.2 o o x F N = + = - = - The y-component is 100sin50.0 100sin170.0 93.969 94.0 o o y F N = + = = The resultant is ( 29 ( 29 2 2 2 2 34.202 93.969 100 x y F F F N N N = + = - + = 1 1 0 93.969 180 tan 180 tan 110 34.202 y o o x F N F N θ - - = + = + = - 2. Compute algebraically the resultant of the following coplanar forces: 100N at 30 degrees, 141.4N at 45 degrees and 100N at 240 degrees. The x-component is 2 100cos30 141.4cos45 100cos240 136.59 1.4 10 o o o x F N = + + = = × The y-component is 100sin30 141.4sin 45 100sin 240 63.382 63 o o o y F N = + + = = The resultant is ( 29 ( 29 2 2 2 2 2 2 1.4 10 63 1.5 10 x y F F F N N N = + = × + = ×
Background image of page 1

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

View Full DocumentRight Arrow Icon
1 1 0 2 63.382 tan tan 24.893 25 1.5 10 y o x F N F N θ - - = = = = × 3. A 12.0g bullet is accelerated from rest to a speed of 700 m/s as it travels 20.0 cm in a gun barrel. Assuming the acceleration to be constant, how large was the accelerating force? 2 1 2 o x v t at ∆ = + o v v at = + Since the bullet is accelerated from the rest then v o = 0. Then 2 1 (1) 2 (2) x at v at ∆ = = From (2) v t a = Substitute this in (1): 2 2 1 2 2 v x a a v x a ∆ = ∆ = Then the acceleration of the bullet is
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/16/2011 for the course PHYS 1 taught by Professor Landen during the Winter '11 term at Macomb Community College.

Page1 / 8

PhysicsCh3 - 1. Two forces act at a point object as...

This preview shows document pages 1 - 3. Sign up to view the full document.

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