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Momentum Question, please help?
A block of steel (density = 7.9 g/cm^3) measures 4 inches x 10 inches x 40 inches and is moving at 364 feet per minute. Find the momentum of the block in kg*m/s.
1 Answer
- ?Lv 69 years agoFavorite Answer
Momentum p in kg*m/s is given by:
(1) p = m * v,
where
m = mass in kg
v = velocity in m/s
Mass m is given by:
(2) m = density * Volume
(3) Volume = 4 * 10 * 40 = 1600 cu in = 2.62 * 10^4 cm^3
Substituting (3) in (2):
(4) m = density * Volume
= 7.9 * 2.62 * 10^4 = 206980g = 207kg
Velocity:
(5) 364 feet per minute = (364 * 0.305) / 60 = 1.85m/s
Substituting (4) and (5) in (1):
(6) p = m * v
= 207kg * 1.85m/s
= 383kg*m/s
.