Use the following graph to answer the following question:
if the incoming photon had a frequency of 8.0 e14 hz, would you have a photo-electron ejected? (5 points)

graph titled maximum kinetic energy of ejected photo electron versus incoming frequency is shown. the y axis is labeled maximum kinetic energy and scales from negative 3 to positive 3 electron volts. the x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. a line connects the points 0, negative 2 and 2.5, negative 1 and 5, 0 and 8, 1 and 10, 2.

yes

no

If steel is more dense that lake water, why can a boat float

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

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)