kylemartinez13
25.06.2019 •
Physics
A1650-kg car is traveling at 38.0 m/s. how fast must a 91.0-kg bicycle and rider be traveling to have the same kinetic energy as the car?
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Ответ:
Bicycle has a speed of 161.7 m/sec.
Given :
Mass of car = 1650 Kg
Speed = 38 m/sec
Mass of bicycle = 91 Kg
Bicycle and car travelling have same Kinetic Energy.
Solution :
Kinetic energy of the car is,
Given that both have same kinetic energy. Therefore,
Bicycle has a speed of 161.7 m/sec.
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Ответ:
161.7 m/s
Explanation:
The kinetic energy of the car is given by
where
m = 1650 kg is the mass of the car
v = 38.0 m/s is the speed
Substituting,
The bycicle + rider has the same kinetic energy; moreover, their combined mass is
m = 91.0 kg
So, the speed of the bike should be
Ответ:
180 kgm/s
Explanation:
From Newton's second law of motion,
ΔM = m(v-u) Equation 1
Where ΔM = change in momentum of the bike, m = mass of the bike, v = final velocity of the bike, u = initial velocity of the bike.
Given: m = 20 kg, u = -9 m/s, v = 0 m/s ( the bike is no longer moving)
Substitute into equation 1
ΔM = 20[0-(-9)]
ΔM = 20(9)
ΔM = 180 kgm/s.
Hence the change in momentum of the bike = 180 kgm/s