Which of the following statements is not true planetary orbits? a. A planet’s mass does not affect how fast it orbits its star.
b. A planet travels faster in its orbit when it closer to the star it is orbiting.
c. The square of the period of a planet's orbit is inversely proportional to the radius of its orbit cubed.
d. Planets have elliptical orbits with the star they orbit as one of the ellipses’ foci.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Which is not true about oxygen-17 and oxygen-18?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.