Two men pushing a stalled car generate a net force of +690Nfor
1 answer:
Answer:
The final momentum of the car is 4554 kg m/s.
Explanation:
Given that,
F = 690 N
Time = 6.6 sec
Momentum :
The momentum is the product of the force and change of time.
We need to calculate the final momentum
Using formula of momentum
Where, F = force
t = time
Put the value into the formula
Hence, The final momentum of the car is 4554 kg m/s.
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Work needed: 720 J
Explanation:
The work needed to stretch a spring is equal to the elastic potential energy stored in the spring when it is stretched, which is given by
where
k is the spring constant
x is the stretching of the spring from the equilibrium position
In this problem, we have
E = 90 J (work done to stretch the spring)
x = 0.2 m (stretching)
Therefore, the spring constant is
Now we can find what is the work done to stretch the spring by an additional 0.4 m, that means to a total displacement of
x = 0.2 + 0.4 = 0.6 m
Substituting,
Therefore, the additional work needed is
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