Energy of a Spacecraft
Very far from earth(at R=\infty), a spacecraft has run out of fuel and...
Energy of a Spacecraft
Very far from earth(at R=\infty), a spacecraft has run out of fuel and its kineticenergy is zero. If only the gravitational force of the earth wereto act on it (i. e., neglect the forces from the sun and other solarsystem objects), the spacecraft would eventually crash into theearth. The mass of the earth is M_e and its radius is R_e. Neglect air resistance throughout this problem, sincethe spacecraft is primarily moving through the near vacuum ofspace.
Part A
Find the speed s_e of the spacecraft when it crashes into the earth.
Express the speed in terms ofM_e, R_e, and the universal gravitational constant G.
s_e =
Part B
Now find the spacecraft's speed when itsdistance from the center of the earth is R=\alpha R_{\rm e}, where \alpha \ge 1.
Express the speed in terms ofs_e and alpha.
s_alpha =
Answers: 1
Physics, 21.06.2019 20:20
Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?
Answers: 2
Physics, 22.06.2019 18:30
Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction
Answers: 2
Physics, 22.06.2019 20:10
On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30ยฐ north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1ยฐ south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)
Answers: 1
Mathematics, 16.05.2021 17:30
English, 16.05.2021 17:30
Mathematics, 16.05.2021 17:30
Mathematics, 16.05.2021 17:30
Health, 16.05.2021 17:30
English, 16.05.2021 17:30
Mathematics, 16.05.2021 17:30
Mathematics, 16.05.2021 17:40
Health, 16.05.2021 17:40
Mathematics, 16.05.2021 17:40
Social Studies, 16.05.2021 17:40