Roland throws a 0.05 kg egg with a velocity of 10 m/s to the right. The egg hits a wall and breaks. Which of the following is true?
O
A. Momentum is not conserved because outside forces act on the
system.
B. The total momentum before the collision equals the total
momentum after the collision.
C. The momentum of the wall after the collision is 0.5 kg-m/s to the
right.
D. The momentum of the egg after the collision is 0.5 kg-m/s to the
left.

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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)

What is a subatomic particle with a negative charge and very little mass?