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A rocket blasts off from rest and attains a speed of 42.2 m/s in 10.9 s. An astronaut has a mass of 63.8 kg. What is the astron...Asked by Maddie
A rocket blasts off from rest and attains a speed of 58.9 m/s in 14.4 s. An astronaut has a mass of 57.5 kg. What is the astronaut's apparent weight during takeoff?
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Answered by
Don
When doing these types of physic problems or actually any physics problem, write down what's given.
m=57.5 kg
v_f= 58.9 m/s
v_i = 0 (because it was a rest, not moving)
t = 14.4 s
g=9.81 m/s^2
The apparent weight is:
W = F + m*g
F=ma
Everything is given to us in the problem except for a, which is acceleration.
a=deltaV/t
deltaV = v_f-v_i
a=(58.9-0)/14.4
a= 4.1 m/s^2
so now lets go back to your two main equation:
W=F+m*g
where F = m*a
F=57.7*4.1
F = 235.75 N
W=235.75 + (57.5*9.81)
W = 799.825 N
m=57.5 kg
v_f= 58.9 m/s
v_i = 0 (because it was a rest, not moving)
t = 14.4 s
g=9.81 m/s^2
The apparent weight is:
W = F + m*g
F=ma
Everything is given to us in the problem except for a, which is acceleration.
a=deltaV/t
deltaV = v_f-v_i
a=(58.9-0)/14.4
a= 4.1 m/s^2
so now lets go back to your two main equation:
W=F+m*g
where F = m*a
F=57.7*4.1
F = 235.75 N
W=235.75 + (57.5*9.81)
W = 799.825 N
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