Which of the following it a unit for angular velocity? a) rad b) degrees c) rad/

Question

Which of the following it a unit for angular velocity? a) rad b) degrees c) rad/s d) rpm e) rad/s^2 f) a and b g) c and d Two coins are placed on the edge of identical turntables, both at a radius of r from the center. Coin 1 is on a turntable with an angular velocity of omega. Coin 2 is has an angular velocity of 1/2 omega. What is the ratio of the coins' velocities, v_1/v_2? a) 1/2 b) 1/1 c) 2/1 d) 1/4 e) 4/1 Coin 1 on the turntable has an angular velocity of omega and a centripetal acceleration of a_c. If the turntable doubles its angular speed, what is the new centripetal acceleration? a) a_c b) 2 a_c c) 4 a_c d) 1/2 a_c e) 1/4 a_c A bicycle has wheels of radius r. If it moves forward so it coven a linear distance of x, how many revolutions has the tire made? a) x/r b) xr c) x/(2 pi r) d) 2 pi r x The moon orbits in a circular path around the earth because of earth acting on the moon with a) a tangential force pushing in the direction the moon is traveling around the earth b) a gravitational force pointing toward the earth c) a normal force pointing away from the earth

Explanation / Answer

1)option g

2) option c, v1/v2= w1/w2

3)option c, because a =w^2 r

4)option c because n= x/circumference

5) b

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