Physics, 25.02.2020 17:34, jocelyntucker
One kilogram of the explosive TNT supplies explosive energy of about 4.2×10^6 J. Let's see what that energy can achieve in lifting objects from Earth's surface to altitudes of hundreds of kilometers. We approach the issue through gravitational potential energy.
a. Assume the acceleration due to gravity is constant at g = 9.81 m/s2 from Earth's surface up to an altitude of 630 km above the surface. (A satellite at such an altitude would be in a "low Earth orbit.") What is the gravitational potential energy, in joules, of a 1.0-kg object at that altitude, taking the reference level for gravitational potential energy (U -0) at Earth's surface?
b. How many kilograms of TNT would need to be exploded, if the released energy were somehow used to raise a 10-kg object from Earth's surface to an altitude of 630 km at 100% efficiency, assuming constant g?
c. Again take the reference level at Earth's surface. Earth's radius and mass are 6.38x103 km and 5.97x1024 kg, respectively. Now calculate the gravitational potential energy, in joules, of a 1 0-kg object at an altitude of 630 km without assuming constant 25%
d. Without assuming constant g, how many kilograms of TNT would need to be exploded, if the released energy were somehow used to raise a 1-0-kg object from Earth's surface to an altitude of 630 km at 100% efficiency?
Answers: 3
Physics, 23.06.2019 01:10, paige3673
Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c. part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?
Answers: 1
One kilogram of the explosive TNT supplies explosive energy of about 4.2×10^6 J. Let's see what that...
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