Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be doubled
A.
B.
.C.
.D.
E.
.Answer: D
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Equilibrium: Three objects are connected by weightless flexible strings as shown in the figure. The pulley has no appreciable mass or friction, and the string connected to the block on the horizontal bench pulls on it parallel to the bench surface. The coefficients of friction between the bench and the block on it are µs = 0.66 and µk = 0.325. You observe that this system remains at rest.(a) Find the mass of the hanging object A.(b) What is the magnitude of the friction force on the block on the bench?
Fill in the blank(s) with the appropriate word(s).
A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75°C into a 250-g aluminum cup, initially at 16°C
What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/kg ? K, and the specific heat of coffee is essentially the same as that of water, which is 4186 J/kg ? K. A) 45°C B) 62°C C) 65°C D) 68°C E) 71°C
A heat treat furnace sketched in Figure 2-59 has an inside surface temperature of 1200ºC and an outside surface temperature of 60ºC. If the walls are assumed to be homogeneous with thermal properties the same as asbestos, estimate the heat transfer from the walls, excluding the door.
Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm-ID tube whose surface is maintained at 620 K. What length of tube is required?
GIVEN
FIND
The length of tube (L) required
ASSUMPTIONS
Surface temperature is constant and uniform
SKETCH
PROPERTIES AND CONSTANTS
for liquid sodium at the average bulk temperature of 550 K
