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cmflores3245
09.04.2021 •
Physics
A railroad car of mass 2.50∙10^4 kg is moving at a speed of 4.00 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s.
(a)What is the speed of the four cars after the collision?
(b)How much kinetic energy is lost in the collision? Where does this energy go?
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Ответ:
a) v = 1.00 m/s
b) ΔKE = 150 kJ
Lost energy makes heat, noise, vibration in the system
Explanation:
conservation of momentum
let m be the mass of one car
m(4.00) + 3m(0) = 4mv
v = 1.00 m/s
ΔKE = ½m(4.00)² + ½(3m)(0.00)² - ½(4m)(1.00)²
ΔKE = 8m + 0m - 2m = 6m J
ΔKE = 6(2.50e4) = 150 kJ
Ответ:
Explanation:
the pituitary gland controls water balance, growth and blood pressure.