Suppose two neutron stars or two black holes are closely orbiting one another. what do scientists predict will eventually happen to them, and why? suppose two neutron stars or two black holes are closely orbiting one another. what do scientists predict will eventually happen to them, and why?
a. their orbits will spiral inward until the two objects merge because of energy lost through gravitational waves.
b. their orbits will gradually grow larger because of the centrifugal force involved as they circle around each other.
c. the orbits would remain stable unless there were a third object orbiting along with them.
d. their orbits will spiral inward as a result of friction with the surrounding gas until all the gas clears, after which their orbits will remain stable.

Orange juice has a lower or higher viscosity than chocolate syrup

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.