When the equation Al + O2? Al2O3 is balanced, the coefficient of O2 is
a. 1
b. 2
c. 3
d. 4
c
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A person wearing a heavy parka is standing in a cold wind. Describe the modes of heat transfer determining heat loss from the person’s body.
GIVEN
- Person standing in a cold wind, wearing a heavy parka
FIND
(a) The modes of heat transfer
SKETCH
Two very small spherical metal objects, each with 1 Coulomb of charge, are brought together in a vacuum so that the separation distance between their centers is 1 mm. What is the force of repulsion between the two objects? (Coulomb's constant is k=9.0 × 109 N.m2/C2.)
A. 9 × 1014 N B. 9 × 1015 N C. 9 × 1012 N D. 9 × 1013 N
Suppose a supersonic airplane flies at a speed of 1670 km/hr from Nairobi, Kenya to Quito, Ecuador; note that this is the same speed that Earth rotates, but in the opposite direction. Describe how this flight would look to an observer on the Moon.
What will be an ideal response?
The sum of two vectors has the smallest magnitude when the angle between these two vectors is
What will be an ideal response?