Slanting Surfaces Without Friction: A system consisting of blocks, a light frictionless pulley, a frictionless incline, and very light connecting wires is shown in the figure. The wires pull on the left-hand blocks parallel to the surface of the ramp. The 9.0-kg block accelerates downward when the system is released gently from rest.(a) What is the magnitude of the acceleration of the 9.0-kg block?(b) What is the tension in the wire connecting the two blocks on the incline?
What will be an ideal response?
(a) 2.1 m/s2 (b) 42 N
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Pressure in a Liquid: Consider a brick that is totally immersed in water, with the long edge of the brick vertical. The pressure on the brick is
A. the same on all surfaces of the brick. B. greatest on the face with largest area. C. greatest on the top of the brick. D. greatest on the sides of the brick. E. greatest on the bottom of the brick.
A cooling system is to be designed for a food storage warehouse for keeping perishable foods cool prior to transportation to grocery stores. The warehouse has an effective surface area of 1860 m2 exposed to an ambient air temperature of 320C. The warehouse wall insulation (k = 0.17 W/(m K)) is 7.5 cm thick. Determine the rate at which heat must be removed (W) from the warehouse to maintain the food at 4°C.
GIVEN
• Cooled warehouse
• Effective area (A) = 1860 m2
• Temperatures
? Outside air = 32°C
? food inside = 4°C
• Thickness of wall insulation (L) = 7.5 cm = 0.075 m
• Thermal conductivity of insulation (k) = 0.17 W/(m K)
FIND
• Rate at which heat must be removed (q)
ASSUMPTIONS
• One dimensional, steady state heat flow
• The food and the air inside the warehouse are at the same temperature
• The thermal resistance of the wall is approximately equal to the thermal resistance of the wall insulation alone
SKETCH
A woman drives 75 m to the east. She stops, asks directions, and then drives 75 m to north. What is the direction of the displacement with respect to east?
a. 30 b. 53 c. 0 d. 45
The K-T event occurred about ______________ million years ago
Fill in the blank(s) with correct word