If 150 kcal of thermal energy raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A) 1.35 kcal/kg ? C°
B) 0.75 kcal/kg ? C°
C) 0.34 kcal/kg ? C°
D) 0.19 kcal/kg ? C°
C
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If a current of 2.4 A is flowing in a wire of diameter 2.0 mm, what is the average current density?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
If the enter full moon passes through the earths umbra, we will see
a)partial solar eclipse b)penumbral lunar eclipse c) total lunar eclipse d) annular eclipse
The identities of dark energy and dark matter are
A) unknown at this time. B) subjects of intense astronomical interest. C) both of these D) neither of these