Atextbook of mass m1 = 1.92 kg rests on a frictionless, horizontal surface. a cord attached to the book runs horizontally to a pulley whose diameter is 0.200 m , then down to a hanging book with mass m2 = 2.93 kg . the system is released from rest, and the books are observed to move a distance 1.17 m over a time interval of 0.810 s. what is the tension in the part of the cord attached to the textbook?

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)

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation