
Concept explainers
(a)
The maximum height gain by the space vehicle.
(a)

Answer to Problem 32AP
The maximum height gain by the space vehicle is v2iR2(gR−12v2i).
Explanation of Solution
The initial speed of the vehicle is vi, the escape speed of space vehicle is vesc and the height of meteorite from the Earth’s surface is h.
Formula to calculate the maximum height gain by the space vehicle by the conservation of energy is,
KE1+PE1=KE2+PE2 (1)
Here, KE1 is the kinetic energy of the space vehicle at the Earth’s surface, KE2 is the final kinetic energy of the space vehicle, PE1 is the potential energy of the space vehicle at the Earth’s surface and PE2 is final potential energy of the space vehicle.
Formula to calculate the kinetic energy of the space vehicle at the Earth’s surface is,
KE1=12mvi2
Here, m is the mass of the space vehicle and vi is the velocity of the space vehicle.
Formula to calculate the potential energy of the space vehicle at the Earth’s surface is,
PE1=−GMmR
Here, M is the mass of Earth, m is the mass of the space vehicle, R is the radius of the Earth and G is the universal gravitational constant.
Formula to calculate the potential energy space vehicle at the altitude is,
PE2=−GMmR+hmax
Here, hmax is the maximum height gain by the space vehicle.
The final kinetic energy of the space vehicle is zero because the space vehicle is rest at that point.
Substitute −GMmR for PE1, −GMmR+hmax for PE2, 12mvi2 for KE1 and 0 for KE2 in equation (1) to find hmax.
12mvi2+(−GMmR)=0+(−GMmR+hmax)12mvi2=GMmR−GMmR+hmax=GMm(1R−1R+hmax)=GMm(hmaxR(R+hmax)) (2)
Further solve the above expression.
12mv2iR(R+hmax)=GMmhmax12mv2iR2+12mv2iRhmax=GMmhmaxhmaxm(GM−12v2iR)=12mv2iR2hmax=v2iR22(GM−12v2iR)
Write the expression for the acceleration due to gravity.
g=GMR2GM=gR2
Here, g is the acceleration due to gravity.
Substitute gR2 for GM in the above equation to find hmax.
hmax=v2iR22(gR2−12v2iR)=v2iR22R(gR−12v2i)=v2iR2(gR−12v2i)
Conclusion:
Therefore, the maximum height gain by the space vehicle is v2iR2(gR−12v2i).
(b)
The speed of the meteorite to strike the Earth.
(b)

Answer to Problem 32AP
The speed of the meteorite to strike the Earth is √2gh(1(1+hR)).
Explanation of Solution
The initial speed of the vehicle is vi, the escape speed of space vehicle is vesc and the height of meteorite from the Earth’s surface is h.
From equation (2), the expression for the speed is given as,
12mv2=GMm(hR(R+h))v2=2GMmm(hR(R+h))
Here, v is the speed of the meteorite to strike the Earth and h is the height of meteorite from the Earth’s surface.
Further solve the above expression.
v2=2GMmm(hR(R+h))v=√2GM(hR(R+h))
Substitute gR2 for GM in the above equation to find v.
v=√2gR2(hR(R+h))=√2gR(h(R+h))=√2gh(1(1+hR))
Conclusion:
Therefore, the speed of the meteorite to strike the Earth is √2gh(1(1+hR)).
(c)
The result from part (a) is consistent with h=u2isin2θi2g
(c)

Answer to Problem 32AP
The result from part (a) is consistent with h=u2isin2θi2g.
Explanation of Solution
Consider a baseball is tossed up with an initial speed that is very small as compared to the escape speed.
vi<vesc
Here, vesc is the escape speed of space vehicle.
As the initial speed that is very small. So the initial speed of the vehicle tends to be zero.
vi→0
From part (a), the maximum height gain by the space vehicle is,
hmax=v2iR2(gR−12v2i)
Substitute 0 for vi in the above equation to find hmax.
hmax=v2iR2(gR−0)=v2i2g (3)
Write the expression for the maximum height of the projectile motion of the baseball.
h=v2isin2θi2g
Here, h is the maximum height of the projectile motion of the baseball and θi is the angle of the projectile motion of the baseball.
From maximum height of the projectile motion of the baseball, the value of angle of the projectile motion of the baseball should be 90°.
Substitute
From equations (3) and (4).
So, the maximum height gain by the space vehicle is consistent with
Conclusion:
Therefore, the result from part (a) is consistent with
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Chapter 13 Solutions
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