1 / 6

Forces Homework

Forces Homework. Fg = m*g – simplest calculation for objects near the surface of the Earth Fg = G m 1 m 2 - for any two objects d 2 - G = 6.67x10 -11 Proportions Fg α 1/d 2 - if d increases, Fg decreases - if d decreases, Fg increases Fg = Fg i * 1/d 2. 1. Fg = m*g

Download Presentation

Forces Homework

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Forces Homework Fg = m*g – simplest calculation for objects near the surface of the Earth Fg = G m1m2- for any two objects d2 - G = 6.67x10-11 Proportions Fg α 1/d2 - if d increases, Fg decreases - if d decreases, Fg increases Fg = Fgi * 1/d2

  2. 1. Fg = m*g Fg = 4.5 kg*9.8 N/kg = Newtons 2. Fg = m*g 167 N = m*9.8 N/kg m = 167N/9.8 N/kg m = kg 3. Fg = m*g 408 N = 250 kg * “g” g = 408N/250 kg g = N/kg or m/s2 P 93

  3. Fg1 = d22 Fg2d12 700 N = 102 x 12 Fg = N 2. a. Fg = m*g = 1x105 kg * 9.8 N/kg = N b. 128000 = 20 x as far as in 6400 part a Fg1 = d22 Fg2d12 Fg = N 30 times as far (1/302) Really far (9x1011 times as far away) 1/d2 = ?? P. 96

  4. 3. Fg1 = d22 Fg2d12 50000N = (1/4)2 x 1 = 50000 /(1/16) = 50000 * 16 = N 4. Fg1 = d22 Fg2d12 How has d changed? Initial: di = 6400 km Now: df = 6600 km So df/di = 6600/6400 = x larger Fg2 = 9.8 N/kg * 1/1.032 = 9.8 * 1/1.06 = N/kg P 96

  5. Fg = G m1m2 d2 = 6.67x10-11(60)(70) 12 = N 2. Fg = G m1m2 d2 =6.67x10-11(2000)(2000) 2.52 = N P 98

  6. a. ME = 6x1024 kg Fg = G m1m2 d2 = 6.67x10-11(6x1024)(1) (20,000,000m)2 = N b. 20,000 / 6400 = 3.13 times the radius of Earth Fg = Fgi * 1/d2 = 9.8N * 1/(3.13)2 = 9.8N * 1/9.797 = N P 98 # 3 – two solutions

More Related