Astronomers believe that most of the meteorites come from broken up asteroids and comets, but some of the meteorites are fragments from the Moon or Mars.

Answer the following statement true (T) or false (F)


True

Physics & Space Science

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Stars swell into giants when hydrogen is exhausted in their centers

Indicate whether the statement is true or false

Physics & Space Science

A parallel circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is ? ?

A. directly proportional to R. B. inversely proportional to R. C. directly proportional to (100 ? + R). D. inversely proportional to (100 ? + R). E. neither directly nor inversely proportional to R or to (100 ? + R).

Physics & Space Science

Our Moon and Mars both show very different hemispheres. Compare them and explain why this occurred in each case

What will be an ideal response?

Physics & Space Science

The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77-kg laboratory technician absorbs 2.3 mJ of 0.5-MeV gamma rays in a work day

The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the number of gamma-ray photons absorbed by the technician in a workday? A) 3 × 1010 B) 3 × 109 C) 3 × 108 D) 1 × 109 E) 1 × 108

Physics & Space Science