A planet has two small satellites in circular orbits around the planet. The first satellite has a period 12.0 hours and an orbital radius 6.00 × 107 m. The second planet has a period 16.0 hours
What is the orbital radius of the second satellite? A) 4.50 × 107
B) 3.90 × 107
C) 9.24 × 107
D) 8.00 × 107
E) 7.27 × 107
E
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Why can't current theories describe what happened during the Planck era?
A) We do not yet have a theory that links quantum mechanics and general relativity. B) We do not know how hot or dense the universe was during that time. C) We do not understand the properties of antimatter. D) The Planck era was the time before the Big Bang, and we cannot describe what happened before that instant.
Give examples of four quantities which are scalars
What will be an ideal response?
The energy used by a 100-watt light bulb in 1 hour is 100 kilowatt-hours
a. True b. False Indicate whether the statement is true or false
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.