A portion or all of the same zodiac constellations can be seen by those in either hemisphere year round
a. True
b. False
Indicate whether the statement is true or false
True
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Why do blue stragglers stand out in globular clusters?
What will be an ideal response?
Hurricanes derive their energy from
a. latent heat. b. hot air. c. cold water. d. wind.
Two charges, +Q and ?Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point?
a.
Vector EA
b.
Vector EB
c.
Vector EC
d.
The electric field at that point is zero.
At 20°C an aluminum ring has an inner diameter of 5.000 cm, and a brass rod has a diameter of 5.020 cm. Keeping the brass rod at 20°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (aAl = 2.4 × 10^-5 /°C, abrass = 1.9 × 10^-5/°C )
a. 111°C c. 228°C b. 187°C d. 437°C