I solved this Biophysics problem myself.

But obviously there are a lot of places that are wrong.

Let the experts see what's right and what's wrong and explain to me what's the right answer!

A helicopter blade spins at exactly 100 revolutions per minute. Its tip is 5.00 m from the center of rotation. Calculate the average speed of the blade tip in the helicopter's frame of reference. * 52.36 m / sec 100 m / minute 500 m / minute No answer 3141.6 cm / minute A football quarterback runs 15.0 m straight forward the playing field in 2.50 s. He is then hit and pushed 3.00 m straight backward in 1.75 s. He breaks the tackle and runs straight forward another 21.0 m in 5.20 s. Calculate his average speed. * 3.81 m/S 5.82 m/S O 2.78 m/s ? 4.13 m/s No answer Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 65.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (9.80 m/s2)? * a = 98 m/S*2 = 10 g O a = 10m/S*2 = 1.02g No answer -? a = 110 m/S*2 = 11.22g a = 100 m/S*2= 10.2g A stationary object has no forces acting on it. True False b ? An object that is not accelerating or decelerating has no forces acting on it. * O True False b? A 500-kg object is accelerating to the right at 10 cm/s^2. What is the magnitude of the rightward net force acting on it in Newtons? * 50 N O No answer SN c ? 5000 N 500 N What is the unit for force ? * O No answer Isaac di O Sir O Kilogram Newton 8Speed in a direction is called as O Momentum Speed O Velocity a ? O Inertia No answer 9. Acceleration of train when it is moving steadily from 4 m/s to 20 m/s in 100 sis . O 0.16 m/512 O 2 m / 512 b? 6.25 m/ 542 No answer 1 m /s12 10. A train starts from rest and accelerates uniformly at the rate of 5 m/s*2. The velocity acquired by the train in 5 sec is * 100 m/S O 5 m/s 25 m/s O 50 m/s No answer O 75 m/s The unit used to measure work is * 1 point meter Joule O No answer d? O Newton O Watt 12. Which of the following is the best example of work being done. * 1 point O doing homework O using a stationary box O lifting a box e ? No answer holding a box