Warm air rises and cool air sinks. So, when an air parcel rises it becomes
A) cooler.
B) warmer.
C) more stable.
D) less stable.
Answer: A
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A 6-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g•°C. The heat of fusion of lead is 24.5 J/g
a. 227°C c. 293°C b. 260°C d. 327°C
Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.
Figure 2-70 shows a section of a large surface plate used for precision measurements. A person touches the surface and thereby induces heat transfer through the plate. Neglecting radiation involved, write the node equations for nodes 1, 5, and 12.
The quantity that is quantized in the oscillating atoms of a blackbody is
a. angular momentum b. energy c. the emission spectrum d. the absorption spectrum e. the wave function