Which statement is true about groundwater flow?

groundwater flows from zones of low pressure to zones of high pressure.

groundwater does not flow but stays in one location until pumped upward.

groundwater moves downward by gravity and from areas of high pressure to areas of low pressure.

groundwater circulates in a convection current manner.

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

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)

The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?