Question

10)
A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why this occurred?
A) The train ran out of momentum.
B) The opposing force of friction stopped the train.
C) The natural state of the train is not to be in motion.
D) The force of gravity slowed the train until it stopped.

Answer 1

Atom A has an atomic number of 19 and mass number of 40. Atom B has an atomic number of 20 and a mass number of 40. Which of these is an accurate statement?
A) Atom A has more protons than Atom B.
B) Atom A has one less proton and one more neutron than Atom B.
C) Atom A has an extra nucleon compared to Atom B.
D) Atom A has one more proton and one more electron than Atom B.

Answer 2

The best thing to do here is to draw a force body diagram




The train rolls a stop horizontally, so \(F_g\) and \(F_N\) are not of question here, but rather the horizontal forces, \(F_a\) and \(F_f\). This leaves you with options B and C.

Answer 3

So do you think B or C?

Answer 4

b

Answer 5

correct