Kepler's second law implies that
a. a planet should move at its greatest speed when it is closest to the Sun.
b. the most massive planets will have the greatest speed in their orbits.
c. the speed of a planet in its orbit depends on the size of the epicycle.
d. the mass of the planet determines how far the planet is from the Sun.
e. the deferent and the epicycle have to be attached to the Sun and not Earth.
a
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A detector absorbs 1.0 × 10^9 photons of monochromatic light and their total energy is found to be 0.33 nJ. What is the wavelength associated with these photons? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s)
a. 600 nm b. 540 nm c. 400 nm d. 500 nm
The greenhouse effect occurs in the
A) troposphere. B) stratosphere. C) lithosphere.
Which are the two most popular candidates for gamma-ray bursters?
A) collisions between a white dwarf and a giant, and merger of two neutron stars B) hypernova making a black hole, and merger of two neutron stars C) formation of uranium in the core of a supergiant, and collisions of white dwarfs D) mergers of two black holes, and merger of a neutron star and a white dwarf E) hypernova making pulsars, and mergers of two white dwarfs
An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN b. 0.63 kN c. 0.66 kN d. 0.60 kN e. 0.57 kN