A depression on the land surface caused by the collapse of a cavern is called a(n)______________
Fill in the blank(s) with correct word
sinkhole
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It can be shown that the change in entropy in heating or cooling a sample is given by the relation src="https://sciemce.com/media/4/5ecd01164bafc272.png" class="w-image" />C?
A. 0.45 J/K
B. 0.60 J/K
C. 0.90 J/K
D. 0.30 J/K
= mc ln 
where m is the mass of the sample, c is the specific heat of the sample, and 
and 
are the final and initial temperatures respectively. What is the change in entropy when 10.0 grams of lead with a specific heat of 0.452 J/gm K is heated from 10.0
C to 50.0
A normal force
A. is any everyday force B. is the gravitational force C. acts perpendicular to the surface D. is always equal to the weight of an object.
For a specific element, photons of how many different energies could be absorbed by electrons to jump from the n = 1 to n = 5 level?
a. 20 b. 10 c. 6 d. 1 e. 4
A large billet of steel initially at 260°C is placed in a radiant furnace where the surface temperature is held at 1200°C. Assuming the billet to be infinite in extent, compute the temperature at point P shown in the accompanying sketch after 25 min have elapsed. The average properties of steel are: k = 28 W/(m K), p = 7360 kg/m3, and c = 500 J/(kg K).
GIVEN
A large billet of steel is placed in a radiant furnace
Initial temperature (To) = 260°C
Surface temperature of billet in the oven (Ts) = 1200°C
Lapse time (t) = 25 min = 1500 s
Thermal conductivity (k) = 28 W/(m K)
Density (p) = 7360 kg/m3
Specific heat (c) = 500 J/(kg K)
FIND
The temperature at point P shown in the accompanying sketch
ASSUMPTIONS
The billet infinite in extent
SKETCH
