millie and lily are identical twins who enjoy swimming their arms and legs provide the force needed to move them through the water millie can swim 25min in 50s lily can swim 100m in 250s a)calculate the swimming speed of each twin b) which twin has greater power when swimming.​

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)