In the formula E=mc2, what does E represent? A) the ...

[gbarreiro]

In the formula E=mc2, what does E represent?
 
  A) the mass-energy, or potential energy stored in an object's mass
  B) the kinetic energy of a moving object
  C) the radiative energy carried by light
  D) the gravitational potential energy of an object held above the ground

Question 2

For vacation, you decide to take a solo boat trip. While contemplating the universe, you lose track of your location. Fortunately, you have some astronomical tables and instruments, as well as a UT clock.
 
  You thereby put together the following description of your situation:  It is the day of the summer solstice.  The Sun is on your meridian at an altitude of 83.5 in the south.  The UT clock reads 22:00. a. What is your latitude? How do you know? b. What is your longitude? How do you know?

[macmac]

Answer to Question 1

A

Answer to Question 2

a. Your latitude is 30N. Because it is the summer solstice, the Sun follows a path 23.5 north of the celestial equator through the sky. Thus, the Sun's meridian altitude of 83.5S tells you that the celestial equator crosses the meridian at 60S. Because we know that the celestial equator crosses the meridian at 90 - (your latitude), your latitude is 90 - 60 = 30; it is north latitude because the celestial equator is in your southern sky.
b. Your longitude is 150W. The Sun is on your meridian, so it is noon for you. The UT clock reads 22:00, or 10 P.M., so Greenwich is 10 hours ahead of you. Each hour represents 15 of longitude, so 10 hours means 150; you are west of Greenwich because your time is behind.

[gbarreiro]

Both answers were spot on, thank you once again

[macmac]

Great! Please up vote