How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?
A) by counting the number of stars visible in this region of the galaxy
B) by estimating the amount of gas and dust in between the stars
C) by using the law of conservation of angular momentum to calculate the orbital speeds of nearby stars
D) by applying Newton's version of Kepler's third law to the orbits of the Sun or other nearby stars around the center of the Galaxy
A
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________ range in wavelength from millimeters to hundreds of meters.
A. Ultraviolet waves B. Gamma rays C. Visible light waves D. X-rays E. Radio waves
From the center outward, the correct order is
A) liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. B) solid metallic inner core, molten metal outer core, silicate mantle and crust. C) solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere. D) solid rock core, liquid metal mantle, solid rock crust. E) molten metal hydrosphere, molten rock lithosphere, solid silicate crust.
Derive an expression for the heat transfer from a tapered fin having base of Y thickness, L length, ? thermal conductivity, h0 convective coefficient, and T0 base temperature. The surrounding fluid temperature is T? .
What will be an ideal response?
The focal point of a satellite in orbit about the Sun is
A) inside the Sun. B) outside the Sun. C) both of these D) neither of these