It is observed to be at a distance of 50 kiloparsecs and moving at a speed of 150 kilometers/second. What is the mass contained within the radius of the orbit of the Large Magellanic Cloud and, therefore, a lower limit to the mass of our Galaxy?

When does your body conduct current more readily?

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness