How might we tell whether the Universe is open or closed?
What will be an ideal response?
According to general relativity, the overall curvature of space-time is determined by the average density of matter plus energy in the Universe. Cosmologists could calculate that space-time is flat if the average density of the Universe equals a critical density. If the average density of the Universe is more than the critical density, the Universe must be closed; and if it is less, the Universe must be open.
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How can a star's blackbody spectrum be used to determine the temperature of a star?
What will be an ideal response?
There are positive and negative magnetic charges, analogous to positive and negative electric charges
Indicate whether the statement is true or false
The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves
A) low temperature of the coals. B) low conductivity of the coals. C) mind over matter techniques.
An automobile tire has a volume of 0.0185 m3. If the pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire?
A) 2.25 × 1023 B) 2.25 × 1024 C) 3.25 × 1023 D) 3.25 × 1024 E) 3.25 × 1025