Choose all the objects which are true about the phases of the moon. (Hint: There are 4 correct answers.) Group of answer choices

phases are the shapes that the moon appears to have during the course of the month

A half circle moon is called a quarter moon.

A new moon occurs when the moon is between Earth and the Sun.

A full moon occurs when Earth is between the sun and moon

a new moon occurs when Earth is between the moon and sun.

A full moon occurs when the moon is between the sun and Earth.

a lunar cycle is approximately 28 days between new and full moon..

a quarter moon is a crescent moon

not clear

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the solar system used to have much dust particles option no d

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).