Ptolemy tried to describe the motion of the planets by devising a small circle, called a(n) ____, which rotated around the edge of a larger circle
a. epicycle
b. foci
c. deferent
d. equant
e. sphere
a
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Hubble's Law is important because ....
A. it showed the existence of dark matter in all galaxies. B. it showed the universe is expanding. C. it can be used to estimate the age of Irregular galaxies. D. it explained the rotational velocity curves of spiral galaxies.
A large cylindrical water tank is mounted on a platform with its central axis vertical. The water level is 3.75 m above the base of the tank, and base is 6.50 m above the ground
A small hole 2.22 mm in diameter has formed in the base of the tank. Both the hole and the top of the tank are open to the air. We can ignore air resistance and treat water as an ideal fluid with a density of 1000 kg/m3. (a) How many cubic meters of water per second is this tank losing? (b) How fast is the water from the hole moving just as it reaches the ground? What will be an ideal response?
What is the gauge pressure if the absolute pressure is 300 kPa?
A) 97 kPa B) 101 kPa C) 199 kPa D) 150 kPa E) 300 kPa
An optical fiber is made of clear plastic with index of refraction n = 1.50 . For what angles with the surface will light remain within the plastic "guide"?
a. j < 66.6° c. j < 51.7° b. j < 41.8° d. j < 57.1°