Solve: Show the procedure clear, complete and organized. Please do not skip any
ID: 1879751 • Letter: S
Question
Solve:
Show the procedure clear, complete and organized. Please do not skip any step or procedure, put everything. Do not use formulas, equations and advanced varials, this is the kind of introduction to physics, that everything is very basic.
1. A force of 45.6 N is applied to a 2.00 kg disc. What is the acceleration of the disk?
2. Find the force that produces an acceleration of 6.4 m / s2 to a mass object of 0.50 kg.
3. A train traveling with an initial speed of 200 km / h reduces its speed until it stops after traveling a distance of 4820 m. (a) Determine its acceleration in m / s2. (b) What is the net force exerted by the engine to stop the train if its mass is 8.63 x 105 kg?
Explanation / Answer
1)
force = 45.6 N
mass = 2.00 Kg
use:
a = force / mass
= 45.6 N / 2.00 Kg
= 22.8 m/s^2
Answer: 22.8 m/s^2
2)
a = 6.4 m/s^2
mass = 0.50 Kg
use:
force = mass*a
= 0.50 Kg * 6.4 m/s^2
= 3.2 N
Answer: 3.2 N
3)
a)
vi = 200 km/h
= 200*1000 m/3600 s
=55.56 m/s
vf = 0 m/s
d = 4820 m
use:
vf^2 = vi^2 + 2*a*d
0 = 55.56^2 + 2*a*4820
a = -0.320 m/s^2
Answer: -0.320 m/s^2
b)
F = m*a
= (8.63*10^5 Kg) * (-0.320 m/s^2)
= -2.76*10^5 N
Answer: -2.76*10^5 N
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