Pulleys On A Multi Gym Linear And Angular Velocity (check/explain These!!)?

Linear and angular velocity (check/explain these!!)? - pulleys on a multi gym

Please read my answers, and tell me what you have done wrong. These are some of many questions. So I have not only the piece here. I have no other parties. I have questions simplified (CAPS), is my answer *. Explaining 77-80, please, what to do! Thx

74) angular velocity = 15,000 radians.
* The angular velocity (rad / min) = 7500 / Π rpm
* The time at 6000 rpm .= 4Π / 5 min

76) WHEEL DIAM 2.8 m³ / min /. Min and 1200 rpm
40Π * angular velocity = rad / s
* Indicates circumfer shortly thereafter. Travel (ft / min) (km / h min) = 3360 m / kmh and 420/11

77) In the 15th round of the last DIAM. Min and 2.5 t /
* What speed mower Travel (km / h)?

78) In the final round of the 26th DIAM. And 14.5 MPH.
* Angular velocity?

79) HORSE TRANSPORT Merry Go Round 10 m / s and the Merry Go Round is 6Rpm.
* What is the center of the horse?

80) smaller pulley 6 cm in diameter. CONNECTED W / pulley LARGE 15 cm diam. Small disc rotates min 120 rpm.
* Vel 4Π angle = rad / s
* Board linear low significance?
* Linear great distance?
* Wide-angle (rad / s)?
* How many minutes high rpm?