A roller coaster climbs up a hill at 4m/s and then zips down the hill at 30 m/s. the momentum of the roller coaster a. is greater up the hill than down the hill
b. is greater down the hill than up the hill
c. remains the same throughout the ride
d. is zero throughout the ride.​

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

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)