![subject](/tpl/images/cats/fizika.png)
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?
![ansver](/tpl/images/cats/User.png)
Answers: 3
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 21.06.2019 22:10
The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 11:30
You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 15:30
What are the north and south poles of a solenoid change with?
Answers: 1
![question](/tpl/images/cats/fizika.png)
You know the right answer?
One kilogram of the explosive TNT supplies explosive energy of about 4.2×10^6 J. Let's see what that...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 25.08.2019 23:10
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/istoriya.png)
History, 25.08.2019 23:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/es.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
History, 25.08.2019 23:10
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/en.png)
English, 25.08.2019 23:10
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/es.png)
Spanish, 25.08.2019 23:10
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 25.08.2019 23:10