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Unformatted text preview: Physics 101 FORM 0 [l] A 5.00-rn radius playground merry-go-round with a moment of inertia 2000 kg-m 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 merry-go-round and step on with negligible speed. What is the angular speed of the merry-go-round 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  The torque required to turn the crank on an ice cream maker is 4.50 N-m. 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  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  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  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  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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