Answer:
(a) v = 1.71 m/s
(b) μ = 0.005
Explanation:
(a)
Using the law of conservation of the momentum:
where,
m₁ = mass of person = 61.1 kg
m₂ = mass of sled = 16.1 kg
u₁ = initial speed of the person = 2.16 m/s
u₂ = initial speed of the sled = 0 m/s
v₁ = v₂ = v = final speeds of both the person and the sled = ?
Therefore,
<u>v = 1.71 m/s</u>
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(b)
The kinetic energy lost by the sled must be equal to the frictional energy:
K.E = fd
where,
μ = coefficient of kinetic friction = ?
d = distance covered = 30 m
g = acceleration due to gravity = 9.81 m/s²
Therefore,
<u>μ = 0.005</u>
A decrease in it's operating temperature would make a heat engine less efficient. This is because in order to operate, a heat engine needs to be hot and maintain that temperature.
Answer:
The answer is Low earth orbit
Answer: D. Energy is always conserved
Explanation: The law of energy conservation says that energy is neither created or destroyed, that it is only transferred or transformed from energy. "Conserved" means to maintain a constant overall total, which ties directly into the law of conservation (Energy can't be created nor destroyed, it can only be transferred or transformed from one form to another).
5,777 K
Radius: 696,300 km (1 R)