Suppose we have determined the orbital period of a planet around its star. If we also know the mass of the star, then we can use the planet's orbital period and the star's mass to calculate
A) the planet's average orbital distance.
B) mass of the planet.
C) eccentricity of the planet's orbit.
D) radius of the planet.
A) the planet's average orbital distance.
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Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
A 15-?F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted? What will be an ideal response?
To totally convert a given amount of mechanical energy into heat is
A) possible. B) impossible. C) need more information D) none of the above
A neutron is characterized by the term "thermal neutron" when
a. its energy is of the order kT, where T is on the order of 0°C. b. its energy is of the order kT, where T is on the order of 0 K. c. its energy is of the order kT, where T is on the order of 273°C. d. its energy is of the order kT, where T is on the order of 100°C. e. its energy is of the order kT, where T is on the order of 0°R.