A satellite is in an elliptical orbit around Earth. At one point on the ellipse, it is 25 × 106 m from the center of Earth and has a speed of 12,000 m/s
What is its speed when it is at another point on the ellipse, 95 × 106 m from the center of Earth? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 12000 m/s
B) 11000 m/s
C) 10000 m/s
D) 9000 m/s
E) 8000 m/s
B
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A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere, Kcylinder, and Khoop. Which of the following is true?
a. Ksphere > Kcylinder b. Khoop > Ksphere c. Khoop > Kcylinder d. Kcylinder > Khoop e. No answer above is correct.
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The PV diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions?
a. clockwise b. counterclockwise c. It is always positive. d. It is always negative.
Nearly every aspect of astronomy is related in some way to the existence of gravity and to the motions which are responsible for a balance against gravity
How does this balance play a role for the miscellaneous objects of the solar system (i.e., the asteroids and comets)? How can some aspect of this be used as a tool to determine masses in the solar system?