A wave is produced in a Slinky as shown. An illustration of a horizontal spring with a hand holding the left end of the spring. Above the spring is labeled direction of wave travel with an arrow toward the right. In the spring are areas where the rings are closer together and areas where the rings are further apart. There is a point labeled P in an area where the rings are further apart.

What is the direction of the Slinky wire at Point P as the waves travel through this point?

A dot with a vector drawn right and a vector drawn left.
A dot vector drawn up and vector drawn down.
A dot with a vector drawn up to the right and a vector drawn down to the left.
A dot with a vector drawn up to the left and a vector drawn down to the right.

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

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)