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, 22.06.2019 02:00, Kyliehayden05
Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.
Answers: 2
Physics, 22.06.2019 09:00, alisonnn101
A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?
Answers: 1
Physics, 22.06.2019 19:00, danielwu462
Which of the following list the divisions of the geologic time scale in order from longest to shortest
Answers: 1
Physics, 23.06.2019 00:00, jessicawolfking
What is the difference between mass density and weight density?
Answers: 1
Mathematics, 17.03.2021 23:40
Mathematics, 17.03.2021 23:40
Arts, 17.03.2021 23:40