The Planck era is another name for the present period of time in the universe
Indicate whether the statement is true or false
FALSE
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If the universe has a density greater than ?o = 1, it is considered high density
Indicate whether the statement is true or false
You want to insert an aluminum rod, which at 20°C has a radius of 1.00020 cm into a copper tube which has a radius of 1.00010 cm at the same temperature
You decide to put both of them in the refrigerator. At what temperature will the rod just fit if both are cooled to the same temperature? The coefficient of thermal expansion for aluminum is 2.4 × 10-5K-1, and that of copper is 1.7 × 10-5K-1. A) 7.8°C B) 6.3°C C) 9.2°C D) 14.7°C E) 5.7°C
When the huge polar caps on Mars form every winter, they are made chiefly of ________
Fill in the blank(s) with correct word
The length of a 100-meter long spaceship passing by you at 0.87c is seen to be
A) 50 m. B) 87 m. C) 100 m. D) 125 m. E) 150 m.