l/False: The potential energy of a stretched spring is given by o.5 kx 13. The I

Question

l/False: The potential energy of a stretched spring is given by o.5 kx 13. The Int its orbital period? pace Station is in a circular orbit about the Earth at an altitude of 380 km. What is 14. ? Th e outward force necessary to maintain uniform circular motion is defined as the centripetal force. 15. If all th e torques acting on a body are balanced then the romntum is conserved A bicycle wheel is 0.75 m in diameter. If the wheel makes 50 revolutions, what linear distance will it travel 16. )(3.14): 3.5m (2.35m) (50) 117. sm 17. A spring with a spring constant of 200 N/m is compressed a distance of 5 cm. How muc 18. True False In a rotating rigid body all the particles have the sample linear velocity 19. A circular hoop and a circular disk have the same mass and the same radius. They are the compressive force?W simultaneously released to roll down an incline. Their final speeds show that b disk is faster c. speeds are the same 20. The restoring force for a simple pendulum is C

Explanation / Answer

Given

13.

h = 380 km

R = 6.37*10^6 m

we know that the orbital speed is V = sqrt(G*M/(R+h))

V = sqrt( 6.673*10^-11*6*10^24/(380*10^3+6.37*10^6)) m /s

v = 7701.6595 m/s

so orbital speed of the space station is V = 7701.6595 m/s

14

the outward force necessary to maintain uniform circular motion is centrifugal force not centripetal force.

so it is FALSE

15

if all the troques acting on a body are balanced then the angular momentum is conserved because

we know summation Torque = dL/dt

16

bicycle wheel diameter is 0.75 m

it can cover a distance in one revolution is 2pi(d/2) = 2pi*0.75/2 m = 2.3561945 m

so it can cover a distance after completing 50 revolutions is 2.3561945*50 m = 117.809725 m

17

k = 200 N/m

x = 5 cm = 0.05 m

work done = 0.5*k*x^2 = 0.5*200*0.05^2 J = 0.25 J

18. False V = r*W

r is differenct so the V also

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