Which of the solar system objects listed below is most similar to Earth in terms of mass and density?
a. Mercury
b. the Moon
c. Venus
d. Mars
e. Deimos
c
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What do we mean when we say that the Sun is in energy balance?
A) The amount of energy released by fusion in the Sun's core equals the amount of energy radiated from the Sun's surface into space. B) The Sun maintains a steady rate of energy output into space. C) The inward force of gravity balances the outward push of pressure. D) The amount of energy contained in the Sun's magnetic field is in balance with the amount of energy going into solar activity such as sunspots and solar flares.
Find the net work done by friction on the body of a snake slithering in a complete circle of radius. The coefficient of friction between the ground and the snake is 0.25, and the snake's weight is
A) -330 J B) 0 J C) -3300 J D) -670 J
To get the space velocity of a star in three dimensions, you need its proper motion, distance, and radial velocity
Indicate whether the statement is true or false
How can a nucleus be described by particular values of A, Z and N when the mass of the nucleus is not equal to Zmp + Nmn, where mp and mn are the masses of free protons and neutrons?
a. A, Z and N have no intrinsic meaning. b. A, Z and N describe the number of particles of given types, but mass has no meaning when part of the mass is elsewhere in the universe. c. A, Z and N describe the number of particles an ideal rather than a real nucleus would have. d. A, Z and N describe the number of particles of given types in the nucleus, but not their masses in a bound state. e. A, Z and N describe the number of particles of given types in the nucleus since the missing mass consists of electrons that are also present in the nucleus.