If a satellite travels at constant speed at all points in its orbit, then its path is
1) a circle.
2) an ellipse.
3) a parabola.
It travels at constant speed because
4) the net force acting on the satellite is zero.
5) it is characteristic for a satellite to travel at constant speed in this type of orbit.
6) gravitational force decreases with increasing distance.
7) there is no component of gravitational pull directed along the satellite's path.
8) of inertia.
Answer: 1, 7
You might also like to view...
A scientist intuitively believes that a higher power must be present in the universe. However, she can provide no experimental data to support her belief. This is an example of
A) pseudoscience B) hypothesis-driven science C) nonscience D) discovery science
Two parallel wires carry the a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I, but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires?
a. Both forces are toward the center wire. b. Since the net forces are zero, there is no direction. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space.
A uranium nucleus (mass 238 units) at rest decays into a helium nucleus (mass 4.0 units) and a thorium nucleus (mass 234 units). If the speed of the helium nucleus is 5.5 × 10^5 m/s, what is the speed of the thorium nucleus?
a. 9.4E+3 m/s b. 3.2E+7 m/s c. 3.4E+3 m/s d. 9.4E+7 m/s e. 1.9E–1 m/s
The wavelength of a ruby laser is 694.3 nm
What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.6022 × 10-19 J) A) 1.537 eV B) 1.646 eV C) 1.786 eV D) 1.812 eV E) 3.572 eV