In _________tempering of glass, ions larger than Si, such as K and Na, are introduced into the surface.
Fill in the blank(s) with the appropriate word(s).
chemical
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A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision
a. 15 m/s b. 7.0 m/s c. 8.0 m/s d. 23 m/s e. 11 m/s
When the universe was several hundred thousand years old, matter and energy decoupled, allowing the ________ radiation to escape, expand and cool off
Fill in the blank(s) with correct word
We have a hollow metallic sphere with charge +5.0 µC and radius 5.0 cm. We insert a -10 µC charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
a. +10 µC c. -5 µC b. +5 µC d. +15 µC
Velocity: A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?
A. 84 km/h B. 89 km/h C. 90 km/h D. 91 km/h