1) your nephew rides a kiddy train at the local carnival. the train, which has
a mass of 1000 kg, rounds a curve with a radius of 5.0 m. the rails can
exert a maximum force of 2000 n in the radial direction. what is the
maximum speed of the train without derailing?

Velocity is 1 m/s

We are given;

We are required to determine the maximum speed of the train.

Therefore, the maximum speed of the train is 1 m/s

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.