Apitcher throws a fastball horizontally toward home plate 18.39 meters away. if the ball is traveling at a speed of 40.0m/s, neglecting air friction, how long does it take for the ball to get to home plate

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

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)

Atoms in a molecule are bonded together by sharing gaining or losing_