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Natasha2012 [34]
3 years ago
14

Why do trains use steel wheels rather than rubber tires?                                                                 A) Stee

l wheels provide more grip, making it easier to stop a train.
B) Rubber tires don't provide enough friction to allow the train to move.
C) Steel wheels increase friction, thus making it easier to move the load.
D) Steel wheels reduce friction, thus requiring less force to move the load.
Physics
2 answers:
Andrej [43]3 years ago
5 0
Steel wheels reduce friction, thus requiring less force to move the load.
kotegsom [21]3 years ago
4 0
D) steel wheels reduce friction, thus requiring less force to move the load.  Friction between rubber and steel would be greater than steel and steel.  Friction creates heat, which represents a loss of energy (which has to come from somewhere else - likely from the kinetic energy of the train)
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3 years ago
Two identical charges q placed 2.0 mapart exert forces of magnitude 4.0 N on each other What is the value of the charge q? a) q
katen-ka-za [31]

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c) 4.2*10^{-5}C

Explanation:

Coulomb's law says that the force exerted between two charges is inversely proportional to the square of distance between them, and is given by the expression:

F=\frac{kq_{1}q_{2}}{r^{2}}

where k is a proportionality constant with the value k=9*10^{9}\frac{Nm^{2}}{C^{2}}

In this case q_{1}=q_{2}=q, so we have:

F=\frac{kq^{2}}{r^{2}}

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Hence, 2nd option is the correct answer.

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