18. when is an atom unlikely to react and form chemical bonds? 19. what is the order of the types of nuclear radiation from lowest to highest energy? 20. which statement is false? rewrite it so that it is true. a. fusion involves the combination of two smaller atoms into a larger atom. b. fission involves the splitting of an atom into smaller atoms. c. fission and fusion are two processes that release very little amounts of energy. 21. what naturally occurring radioisotope is used as the fuel for a nuclear reactor? 22. magnesium oxide is a binary ionic compound. from its formula, mgo, how do you know that mg is the metal? 23. on the periodic table, there are two numbers in the block for the element potassium, k: 19 and 39.098. what are the names of the numbers and what do they measure?

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."