20l Southem University and A&M; College, Baton Rouge Louisiana u bbPhD. PART ASh

Question

20l Southem University and A&M; College, Baton Rouge Louisiana u bbPhD. PART AShow your work in the space provided 1. The gravitational don between two 60 kg studen"240x12 N How far they are apart 2 gravey 'atthe sutace of 3399 km from its center. What is the mass of the The acceleration due t 1.8 3, A mass of 10 b is ifted 4 ft above the floor. How much wok is done 4 5000 Nmwhen spring consta offie elastic spring compressed it stretches 0 075 m. How much is the elastic potential energy of the spring S The kinetic energy of rocket is 1.3 X 10 J when it is moving with 6. An electric lft can raise 300 b a distance of 15 ft in 5 sec. What is the power of the lift in hp A dircular force of 265 N was applied to a 1500-kg car travels in a ircular track of radius 85 m.With what velocity is moving 8. A car, starting from rest, travelled 800 t with a constant acceleration What is its accelerates in 12 seconds?,

Explanation / Answer

1. We know that F = Gm1m2/R2

R = sqrt(Gm1m2/F) = sqrt(6.67x10-11*60*60/2.4x10-7) =1.00002 m........Ans.

2. we know that ag = Gm/R2

m = a*R2/G = 1.6*(3399x10^3)^2/ 6.67x10^-11 =2.78 x 10^23 Kg...........Ans.

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