Serway_CP_poll_ch07

# Serway_CP_poll_ch07 - A grinding wheel, initially at rest,...

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Unformatted text preview: A grinding wheel, initially at rest, rotates with a constant acceleration of 0.5 rad/s 2 . At the instant that it has gone through an angular displacement of 36 rad, what is its angular velocity? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 5.0 rad/s 2. 3.0 rad/s 3. 6.0 rad/s 4. 12.0 rad/s A grinding wheel, initially at rest, rotates with a constant acceleration of 0.5 rad/s 2 . What is the time interval required for it to reach a 36 rad displacement after starting from rest? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 5.0 s 2. 3.0 s 3. 6.0 s 4. 12.0 s A 0.4 kg mass, attached to the end of a 0.75 m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N then what maximum velocity can the mass have if the string is not to break? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 375 m/s 2. 22.4 m/s 3. 19.4 m/s 4. 29.0 m/s A 0.3 m radius automobile tire accelerates from rest at a constant 2 rad/s 2 over a 5 s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5 s interval? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 33.3 m/s 2 2. 6.7 m/s 2 3. 0.6 m/s 2 4. 0.3 m/s 2 A wheel rotating at the rate of 5 rev/s has what approximate angular velocity? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 3.2 rad/s 2. 1.6 rad/s 3. 16 rad/s 4. 31 rad/s A military helicopter has rotor blades 3.0 m long rotating at 600 rpm. What is the tangential velocity of each blade tip? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 99 m/s 2. 188 m/s 3. 33 m/s 4. 66 m/s A military helicopter has rotor blades 3.0 m long rotating at 600 rpm. What is the centripetal acceleration that must act 2.0 m from the axis of rotation? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 7895 m/s 2 2. 3998 m/s 2 3. 1999 m/s 2 4. 516 m/s 2 A 0.3 m radius automobile tire rotates how many rad after starting at rest and accelerating at a constant 2 rad/s 2 over a 5 s interval?...
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## This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_CP_poll_ch07 - A grinding wheel, initially at rest,...

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