Ahot-air balloon is ascending at a rate of 12 m/s. when it is 80 m above the ground, a package is dropped over the side of the passenger basket. what is the speed of the package just before it hits the ground? give you answer in m/s. a) 39.6 m/s b) 29.3 m/s c) 41.4 m/s d) 28.0 m/s

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)

Heterogeneous mixture with larger particles that never settle is

Why do atoms emit energy of only specific wavelengths