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Unformatted text preview: Physics 101 FORM 0 [l] A 5.00rn radius playground merrygoround with a moment of inertia 2000 kgm 2 is rotating freely with an angular speed of 1.0 rad/s. Two people, each having a mass of 60 kg, are standing right outside the edge of the merrygoround and step on with negligible speed. What is the angular speed of the merrygoround right after the two people have stepped on? (JA))0.40 rad/s [B] 0.60 rad/s [C] 0.80 rad/s [D] 1.0 rad/s [2] The torque required to turn the crank on an ice cream maker is 4.50 Nm. How much work does it take to turn the crank through 150 full turns? [A] 675 J [B] 1350 J (fCj)4240 J [D] 6120 J [3] The mass of Pluto is 1.29 x 10 22 kg and its radius is 1.15 x 10 6 m. What is the value of g at the surface of Pluto? (JAJ)0.651 m/s 2 [B] 1.65 m/s 2 [C] 3.72 m/s 2 [D] 9.81 m/s 2 [4] Uranus completes one revolution about its own axis every 17.24 hours. What is the radius of a circular orbit required for a satellite to revolve about Uranus with the same period? Uranus has a mass of 8.69 X 10 25 kg. [A] 7.46 X 10 6 m ("[1)8.27 x 10 7 m [C] 9.03 x 10 7 m [D] 2.56 x 10 8 m [5] Suppose that the Sun were to collapse under its own gravitational pull. To what radius would it have to be reduced in order to resemble a black hole from which even light (with speed 3.00 x 10 8 m/s) could not escape due to gravity? The mass of the Sun is 2.00 x 10 30 kg. [A] 1.48 km [B] 1.52 km [C] 2.10 km (0)2.96 km [6] A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with frequency 2.50 Hz. What is the radius of theits surface....
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 Spring '08
 Ashkenkai
 Physics, Inertia, Mass

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