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)
One little piece of information I think you left out of your question:
WHERE did the earthquake occur ? ?
It's going to make a big difference.
We are given:
A rectangular glass pane with
W = 91.1 cm
L = 155.9 cm
We are asked to determine the area of the rectangle. The formula of the area of the rectangle is
A = l x w
A = 91.1 cm x 155.9 cm
A = 14202.49 cm^2<span />
Let positive be west and negative be east because they
are contrasting in directions.
The forces are 4100, -830, and -1200
The sum of the forces is 4100 – 830 – 1200 = 2070 N.
Newton’s law F = ma is used.
2070 = 6800 a
Isolating a will give us 2070 / 6800 = a
a = 0.34 m/s^2
The answer for this is yes.
