A light year is a unit of
A) time.
B) energy.
C) distance.
D) mass.
Answer: C
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Lead melts at 327.44ºC with a heat of fusion of 23.02 kJ/kg. If a 10-kg solid ingot of lead at its saturation temperature is heated in a container at 500ºC, having an average convective heat transfer coefficient of 100 W/m2?K, determine the time to completely melt the ingot. Assume lumped heat capacity.
What will be an ideal response?
Which has a greater mass: four protons or a helium nucleus with two protons and two neutrons?
A) four protons B) the helium nucleus C) They have the same mass.
Earth's magnetic field
a. results from a huge bar magnet within the planet. b. is believed to arise from currents within the planet's core. c. is always parallel to the planet's surface. d. is always in the same direction.
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s velocity is positive in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions