1. during which phase of the moon may a solar eclipse occur? (points : 1)
new moon
first quarter moon
full moon
third quarter moon

question 2. 2. during which phase of the moon may a lunar eclipse occur? (points : 1)
new moon
first quarter moon
full moon
third quarter moon

question 3. 3. which layer of the sun is visible during a total solar eclipse? (points : 1)
photosphere
chromosphere
core
corona
plz

In science and physics what is the standard unit of measure for speed?

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.